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NI RFmx SpecAn SEM Configuration Functions

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Dane Stull edited this page Feb 18, 2022 · 3 revisions

SEM Configuration Functions

SEM Configure

RFmxSpecAn_SEMCfgNumberOfCarriers

int32 __stdcall RFmxSpecAn_SEMCfgNumberOfCarriers (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 numberOfCarriers);

Purpose

Configures the number of carriers for the spectral emission mask (SEM) measurement.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
numberOfCarriers int32 Specifies the number of carriers.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgCarrierEnabled

int32 __stdcall RFmxSpecAn_SEMCfgCarrierEnabled (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 carrierEnabled);

Purpose

Configures whether to consider the carrier power as part of total carrier power measurement.

Use "carrier<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and carrier number. If you do not specify the signal name, the default signal instance is used.

Example:

"carrier0"

"signal::sig1/carrier0"

You can use the RFmxSpecAn_BuildCarrierString2.
carrierEnabled int32 Specifies whether to consider the carrier power as part of total carrier power measurement.
RFMXSPECAN_VAL_SEM_ENABLED_FALSE (0) The carrier power is not considered as part of the total carrier power.
RFMXSPECAN_VAL_SEM_ENABLED_TRUE (1) The carrier power is considered as part of the total carrier power.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgCarrierFrequency

int32 __stdcall RFmxSpecAn_SEMCfgCarrierFrequency (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 carrierFrequency);

Purpose

Configures the center frequency, in hertz (Hz), of the carrier, relative to the RF center frequency.

Use "carrier<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and carrier number. If you do not specify the signal name, the default signal instance is used. Example:

"carrier0"

"signal::sig1/carrier0"

You can use the RFmxSpecAn_BuildCarrierString2.
carrierFrequency float64 Specifies the center frequency, in hertz (Hz), of the carrier, relative to the RF center frequency.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgCarrierChannelBandwidth

int32 __stdcall RFmxSpecAn_SEMCfgCarrierFrequency (niRFmxInstrHandle instrumentHandle, char selectorString[],float64 carrierChannelBandwidth);

Purpose

Configures the channel bandwidth of the carrier.

Use "carrier<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and carrier number. If you do not specify the signal name, the default signal instance is used. Example:

"carrier0"

"signal::sig1/carrier0"

You can use the RFmxSpecAn_BuildCarrierString2.
carrierChannelBandwidth float64 Specifies the channel bandwidth of the carrier. It is used to calculate the values of the RFMXSPECAN_ATTR_SEM_OFFSET_START_FREQUENCY attribute to RFMXSPECAN_VAL_SEM_CARRIER_EDGE_TO_MEASUREMENT_BANDWIDTH_CENTER or RFMXSPECAN_VAL_SEM_CARRIER_EDGE_TO_MEASUREMENT_BANDWIDTH_EDGE.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgCarrierIntegrationBandwidth

int32 __stdcall RFmxSpecAn_SEMCfgCarrierIntegrationBandwidth (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 integrationBandwidth);

Purpose

Configures the frequency range, in hertz (Hz), over which the measurement integrates the carrier power.

Use "carrier<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and carrier number. If you do not specify the signal name, the default signal instance is used.

Example:

"carrier0"

"signal::sig1/carrier0"

You can use the RFmxSpecAn_BuildCarrierString2.
integrationBandwidth float64 Specifies the frequency range, in Hz, over which the measurement integrates the carrier power.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgCarrierRBWFilter

int32 __stdcall RFmxSpecAn_SEMCfgCarrierRBWFilter (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 RBWAuto, float64 RBW, int32 RBWFilterType);

Purpose

Configures the resolution bandwidth (RBW) filter of the carrier signal.

Use "carrier<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and carrier number. If you do not specify the signal name, the default signal instance is used.

Example:

"carrier0"

"signal::sig1/carrier0"

You can use the RFmxSpecAn_BuildCarrierString2.
RBWAuto int32 Specifies whether the measurement computes the RBW. Refer to the RBW and Sweep Time section in the SEM topic for more information about RBW and sweep time.
RFMXSPECAN_VAL_SEM_RBW_AUTO_FALSE (0) The measurement uses the RBW that you specify in the RBW parameter.
RFMXSPECAN_VAL_SEM_RBW_AUTO_TRUE (1) The measurement computes the RBW.

| :- | :- | :- | |RBW|float64|Specifies the bandwidth, in hertz (Hz), of the RBW filter used to sweep the acquired carrier signal, when you set the RBWAuto parameter to RFMXSPECAN_VAL_SEM_RBW_AUTO_FALSE.| |RBWFilterType|int32|Specifies the shape of the digital RBW filter. |

RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_FFT_BASED (0) No RBW filtering is performed.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_GAUSSIAN (1) An RBW filter with a Gaussian response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_FLAT (2) An RBW filter with a flat response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_SYNCH_TUNED_4 (3) An RBW filter with a 4-pole synchronously-tuned response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_SYNCH_TUNED_5 (4) An RBW filter with a 5-pole synchronously-tuned response is applied.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgCarrierRRCFilter

int32 __stdcall RFmxSpecAn_SEMCfgCarrierRRCFilter (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 RRCFilterEnabled, float64 RRCAlpha);

Purpose

Configures the root raised cosine (RRC) channel filter to apply on the acquired carrier channel before measuring the channel power. RRC alpha is the filter roll off.

Use "carrier<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and carrier number. If you do not specify the signal name, the default signal instance is used.

Example:

"carrier0"

"signal::sig1/carrier0"

You can use the RFmxSpecAn_BuildCarrierString2.
RRCFilterEnabled int32 Specifies whether to apply the root-raised-cosine (RRC) filter on the acquired carrier channel before measuring the carrier channel power.
RFMXSPECAN_VAL_ACP_RRC_FILTER_ENABLED_FALSE (0) The channel power of the acquired carrier channel is measured directly.
RFMXSPECAN_VAL_ACP_RRC_FILTER_ENABLED_TRUE (1) The RRC filter is applied on the acquired carrier channel before measuring the carrier channel power.

| :- | :- | :- | |RRCAlpha|float64|Specifies the roll-off factor for the root-raised-cosine (RRC) filter. |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgNumberOfOffsets

int32 __stdcall RFmxSpecAn_SEMCfgNumberOfOffsets (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 numberOfOffsets);

Purpose

Configures the number of offset segments for the spectral emission mask (SEM) measurement.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
numberOfOffsets int32 Specifies the number of offset segments.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetFrequency

int32 __stdcall RFmxSpecAn_SEMCfgOffsetFrequency (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 offsetStartFrequency, float64 offsetStopFrequency, int32 offsetEnabled, int32 offsetSideband);

Purpose

Configures the offset frequency start and stop values and specifies whether the offset segment is present on one side, or on both sides of the carriers.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used. Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
offsetStartFrequency float64 Specifies the start frequency, in hertz (Hz), of the offset segment relative to the closest configured carrier channel bandwidth center or carrier channel bandwidth edge based on the RFMXSPECAN_ATTR_SEM_OFFSET_FREQUENCY_DEFINITION attribute.
offsetStopFrequency float64 Specifies the stop frequency, in hertz (Hz), of the offset segment relative to the closest configured carrier channel bandwidth center or carrier channel bandwidth edge based on the RFMXSPECAN_RANGE_TABLE_SEM_OFFSET_FREQUENCY_DEFINITION attribute.
offsetEnabled int32 Specifies whether to enable the offset segment for the SEM measurement.
RFMXSPECAN_VAL_SEM_OFFSET_ENABLED_FALSE (0) Disables the offset segment for the SEM measurement.
RFMXSPECAN_VAL_SEM_OFFSET_ENABLED_TRUE (1) Enables the offset segment for the SEM measurement.

| :- | :- | :- | |offsetSideband|int32|Specifies whether the offset segment is present on one side, or on both sides of the carriers. |

RFMXSPECAN_VAL_SEM_OFFSET_SIDEBAND_NEGATIVE (0) Configures a lower offset segment to the left of the leftmost carrier.
RFMXSPECAN_VAL_SEM_OFFSET_SIDEBAND_POSITIVE (1) Configures a lower offset segment to the left of the rightmost carrier.
RFMXSPECAN_VAL_SEM_OFFSET_SIDEBAND_BOTH (2) Configures both negative and positive offset segments.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetRBWFilter

int32 __stdcall RFmxSpecAn_SEMCfgOffsetRBWFilter (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 RBWAuto, float64 RBW, int32 RBWFilterType);

Purpose

Configures the resolution bandwidth (RBW) filter of the offset segment.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
RBWAuto int32 Specifies whether the measurement computes the RBW. Refer to the RBW and Sweep Time section in the SEM topic for more information about RBW and sweep time.
RFMXSPECAN_VAL_SEM_RBW_AUTO_FALSE (0) The measurement uses the RBW that you specify in the RBW parameter.
RFMXSPECAN_VAL_SEM_RBW_AUTO_TRUE (1) The measurement computes the RBW.

| :- | :- | :- | |RBW|float64|Specifies the bandwidth, in hertz (Hz), of the RBW filter used to sweep the acquired offset segment, when you set the RBWAuto parameter to RFMXSPECAN_VAL_SEM_RBW_AUTO_FALSE.| |RBWFilterType|int32|Specifies the shape of the digital RBW filter. |

RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_FFT_BASED (0) No RBW filtering is performed.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_GAUSSIAN (1) An RBW filter with a Gaussian response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_FLAT (2) An RBW filter with a flat response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_SYNCH_TUNED_4 (3) An RBW filter with a 4-pole synchronously-tuned response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_SYNCH_TUNED_5 (4) An RBW filter with a 5-pole synchronously-tuned response is applied.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetBandwidthIntegral

int32 __stdcall RFmxSpecAn_SEMCfgOffsetBandwidthIntegral (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 bandwidthIntegral);

Purpose

Configures the resolution of the spectrum to compare with spectral mask limits as an integer multiple of the resolution bandwidth (RBW).

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
bandwidthIntegral int32 Specifies the resolution of the spectrum to compare with spectral mask limits as an integer multiple of the RBW. If you set this parameter to a value greater than 1, the measurement acquires the spectrum with a narrow resolution and then processes it digitally to get a wider resolution that is equal to the product of the bandwidth integral and the RBW.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetRelativeAttenuation

int32 __stdcall RFmxSpecAn_SEMCfgOffsetRelativeAttenuation (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 relativeAttenuation);

Purpose

Configures the attenuation, in dB, relative to the external attenuation.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
relativeAttenuation float64 Specifies the attenuation, in dB, relative to the external attenuation. Use this parameter to compensate for variations in external attenuation when the offset channels are spread wide in frequency.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetLimitFailMask

int32 __stdcall RFmxSpecAn_SEMCfgOffsetLimitFailMask (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 limitFailMask);

Purpose

Specifies the criteria to determine the measurement fail status.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
limitFailMask int32 Specifies the criteria to determine the measurement fail status.
RFMXSPECAN_VAL_SEM_OFFSET_LIMIT_FAIL_MASK_ABSOLUTE_AND_RELATIVE (0) The measurement fails if the power in the segment exceeds both the absolute and relative masks.
RFMXSPECAN_VAL_SEM_OFFSET_LIMIT_FAIL_MASK_ABSOLUTE_OR_RELATIVE (1) The measurement fails if the power in the segment exceeds either the absolute or relative mask.
RFMXSPECAN_VAL_SEM_OFFSET_LIMIT_FAIL_MASK_ABSOLUTE (2) The measurement fails if the power in the segment exceeds the absolute mask.
RFMXSPECAN_VAL_SEM_OFFSET_LIMIT_FAIL_MASK_RELATIVE (3) The measurement fails if the power in the segment exceeds the relative mask.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetAbsoluteLimit

int32 __stdcall RFmxSpecAn_SEMCfgOffsetAbsoluteLimit (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 absoluteLimitMode, float64 absoluteLimitStart, float64 absoluteLimitStop);

Purpose

Configures the absolute limit mode and specifies the absolute power limits corresponding to the beginning and end of the offset segment.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
absoluteLimitMode int32 Specifies whether the absolute limit mask is a flat line or a line with a slope.
RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_MANUAL (0) The line specified by the RFMXSPECAN_ATTR_SEM_OFFSET_ABSOLUTE_LIMIT_START attribute values as the two ends is considered as the mask.
RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_COUPLE (1) The two ends of the line are coupled to the value of the RFMXSPECAN_ATTR_SEM_OFFSET_ABSOLUTE_LIMIT_START attribute.

| :- | :- | :- | |absoluteLimitStart|float64|Specifies the absolute power limit, in dBm, corresponding to the beginning of the offset segment. The value of this parameter is also set as the stop limit for the offset segment when you set the absoluteLimitMode parameter to RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_COUPLE.| |absoluteLimitStop|float64|Specifies the absolute power limit, in dBm, corresponding to the end of the offset segment. This parameter is ignored when you set the absoluteLimitMode parameter to RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_COUPLE.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetFrequencyDefinition

int32 __stdcall RFmxSpecAn_SEMCfgOffsetFrequencyDefinition (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 offsetFrequencyDefinition);

Purpose

Configures the offset frequency definition for the SEM measurement.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
offsetFrequencyDefinition int32 Specifies the definition of the start frequency and stop frequency of the offset segments from the nearest carrier channels.
RFMXSPECAN_VAL_SEM_CARRIER_CENTER_TO_MEASUREMENT_BANDWIDTH_CENTER (0) The start frequency and stop frequency are defined from the center of the closest carrier channel bandwidth to the center of the offset segment measurement bandwidth. Measurement Bandwidth = Resolution Bandwidth * Bandwidth Integral.
RFMXSPECAN_VAL_SEM_CARRIER_CENTER_TO_MEASUREMENT_BANDWIDTH_EDGE (1) The start frequency and stop frequency are defined from the center of the closest carrier channel bandwidth to the nearest edge of the offset segment measurement bandwidth.
RFMXSPECAN_VAL_SEM_CARRIER_EDGE_TO_MEASUREMENT_BANDWIDTH_CENTER (2) The start frequency and stop frequency are defined from the nearest edge of the closest carrier channel bandwidth to the center of the nearest offset segment measurement bandwidth.
RFMXSPECAN_VAL_SEM_CARRIER_EDGE_TO_MEASUREMENT_BANDWIDTH_EDGE (3) The start frequency and stop frequency are defined from the nearest edge of the closest carrier channel bandwidth to the edge of the nearest offset segment measurement bandwidth.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetRelativeLimit

int32 __stdcall RFmxSpecAn_SEMCfgOffsetRelativeLimit (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 relativeLimitMode, float64 relativeLimitStart, float64 relativeLimitStop);

Purpose

Configures the relative limit mode and specifies the relative power limits corresponding to the beginning and end of the offset segment.

Use "offset<n>" as the selector string to configure this function.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name and offset number. If you do not specify the signal name, the default signal instance is used.

Example:

"offset0"

"signal::sig1/offset0"

You can use the RFmxSpecAn_BuildOffsetString2.
relativeLimitMode int32 Specifies whether the relative limit mask is a flat line or a line with a slope.
RFMXSPECAN_VAL_SEM_OFFSET_RELATIVE_LIMIT_MODE_MANUAL (0) The line specified by the RFMXSPECAN_ATTR_SEM_OFFSET_RELATIVE_LIMIT_START attribute values as the two ends is considered as the mask.
RFMXSPECAN_VAL_SEM_OFFSET_RELATIVE_LIMIT_MODE_COUPLE (1) The two ends of the line are coupled to the value of the RFMXSPECAN_ATTR_SEM_OFFSET_RELATIVE_LIMIT_START attribute.

| :- | :- | :- | |relativeLimitStart|float64|Specifies the relative power limit, in dB, corresponding to the beginning of the offset segment. The value of this parameter is also set as the stop limit for the offset segment when you set the relativeLimitMode parameter to RFMXSPECAN_VAL_SEM_RELATIVE_LIMIT_MODE_COUPLE. | |relativeLimitStop|float64|Specifies the relative power limit, in dB, corresponding to the end of the offset segment. This parameter is ignored if you set the relativeLimitMode parameter to RFMXSPECAN_VAL_SEM_RELATIVE_LIMIT_MODE_COUPLE.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgPowerUnits

int32 __stdcall RFmxSpecAn_SEMCfgPowerUnits (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 powerUnits);

Purpose

Configures the units for the absolute power.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
powerUnits int32 Specifies the units for the absolute power.
RFMXSPECAN_VAL_SEM_POWER_UNITS_DBM (0) The absolute powers are reported in dBm.
RFMXSPECAN_VAL_SEM_POWER_UNITS_DBM_PER_HZ (1) The absolute powers are reported in dBm/Hz.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgReferenceType

int32 __stdcall RFmxSpecAn_SEMCfgReferenceType (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 referenceType);

Purpose

Configures whether the power reference is the integrated power or the peak power in the closest carrier channel.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
referenceType int32 Specifies whether the power reference is the integrated power or the peak power in the closest carrier channel. The leftmost carrier is the carrier closest to all the lower (negative) offset segments. The rightmost carrier offset is the carrier closest to all the upper (positive) offset segments.
RFMXSPECAN_VAL_SEM_REFERENCE_TYPE_INTEGRATION (0) The power reference is the integrated power of the closest carrier.
RFMXSPECAN_VAL_SEM_REFERENCE_TYPE_PEAK (1) The power reference is the peak power of the closest carrier.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgSweepTime

int32 __stdcall RFmxSpecAn_SEMCfgSweepTime (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 sweepTimeAuto, float64 sweepTimeInterval);

Purpose

Configures the sweep time.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
sweepTimeAuto int32 Specifies whether the measurement computes the sweep time.
RFMXSPECAN_VAL_SEM_SWEEP_TIME_AUTO_FALSE (0) The measurement uses the sweep time that you specify in the sweepTimeInterval parameter.
RFMXSPECAN_VAL_SEM_SWEEP_TIME_AUTO_TRUE (1) The measurement calculates the sweep time based on the value of the RFMXSPECAN_ATTR_SEM_OFFSET_RBW_FILTER_BANDWIDTH attributes.

| :- | :- | :- | |sweepTimeInterval|float64|Specifies the sweep time, in seconds, when you set the sweepTimeAuto parameter to RFMXSPECAN_VAL_SEM_SWEEP_TIME_AUTO_FALSE.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgAveraging

int32 __stdcall RFmxSpecAn_SEMCfgAveraging (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 averagingEnabled, int32 averagingCount, int32 averagingType);

Purpose

Configures averaging for the spectral emission mask (SEM) measurement.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
averagingEnabled int32 Specifies whether to enable averaging for the measurement.
RFMXSPECAN_VAL_SEM_AVERAGING_ENABLED_FALSE (0) The measurement is performed on a single acquisition.
RFMXSPECAN_VAL_SEM_AVERAGING_ENABLED_TRUE (1) The measurement uses the averagingCount parameter to calculate the number of acquisitions over which the measurement is averaged.

| :- | :- | :- | |averagingCount|int32|Specifies the number of acquisitions used for averaging when you set the averagingEnabled parameter to RFMXSPECAN_VAL_SEM_AVERAGING_ENABLED_TRUE.| |averagingType|int32|Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for the measurement. Refer to the Averaging section of the Spectrum topic for more information about averaging types.|

RFMXSPECAN_VAL_SEM_AVERAGING_TYPE_RMS (0) The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
RFMXSPECAN_VAL_SEM_AVERAGING_TYPE_LOG (1) The power spectrum is averaged in a logarithm scale.
RFMXSPECAN_VAL_SEM_AVERAGING_TYPE_SCALAR (2) The square root of the power spectrum is averaged.
RFMXSPECAN_VAL_SEM_AVERAGING_TYPE_MAXIMUM (3) The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
RFMXSPECAN_VAL_SEM_AVERAGING_TYPE_MINIMUM (4) The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

| :- | :- | :- |

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgFFT

int32 __stdcall RFmxSpecAn_SEMCfgFFT (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 FFTWindow, float64 FFTPadding);

Purpose

Configures the FFT window and padding to obtain a spectrum for the spectral emission mask (SEM) measurement.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
FFTWindow int32 Specifies the FFT window type to use to reduce spectral leakage. Refer to the Window and FFT section of the Spectrum topic for more information about FFT window types.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_NONE (0) Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_FLAT_TOP (1) Measures single-tone amplitudes accurately.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_HANNING (2) Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_HAMMING (3) Analyzes closely-spaced sine waves.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_GAUSSIAN (4) Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_BLACKMAN (5) Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_BLACKMAN_HARRIS (6) Useful as a good general purpose window, having side lobe rejection >90dB and having a moderately wide main lobe.
RFMXSPECAN_VAL_SEM_FFT_WINDOW_KAISER_BESSEL (7) Separates two tones with frequencies close to each other but with widely-differing amplitudes.

| :- | :- | :- | |FFTPadding|float64|Specifies the factor by which the time-domain waveform is zero-padded before FFT. The FFT size is given by the following formula: waveform size * padding. This parameter is used only when the acquisition span is less than the device instantaneous bandwidth of the device.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

SEM Array Apis

RFmxSpecAn_SEMCfgOffsetFrequencyArray

int32 __stdcall RFmxSpecAn_SEMCfgOffsetFrequencyArray (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 offsetStartFrequency[], float64 offsetStopFrequency[], int32 offsetEnabled[], int32 offsetSideband[], int32 numberOfElements);

Purpose

Configures the offset frequency start and stop values and specifies whether the offset segment is present on one side, or on both sides of the carriers.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
offsetStartFrequency float64[] Specifies the array of start frequencies, in hertz (Hz), of each offset segment relative to the closest configured carrier channel bandwidth center or carrier channel bandwidth edge based on the RFMXSPECAN_ATTR_SEM_OFFSET_FREQUENCY_DEFINITION attribute. Specify NULL if you do not want to set a value for this array.
offsetStopFrequency float64[] Specifies the array of stop frequencies, in hertz (Hz), of each offset segment relative to the closest configured carrier channel bandwidth center or carrier channel bandwidth edge based on the RFMXSPECAN_RANGE_TABLE_SEM_OFFSET_FREQUENCY_DEFINITION attribute. Specify NULL if you do not want to set a value for this array.
offsetEnabled int32[] Specifies whether to enable the offset segment for the SEM measurement. Specify NULL if you do not want to set a value for this array.
RFMXSPECAN_VAL_SEM_OFFSET_ENABLED_FALSE (0) Disables the offset segment for the SEM measurement.
RFMXSPECAN_VAL_SEM_OFFSET_ENABLED_TRUE (1) Enables the offset segment for the SEM measurement.

| :- | :- | :- | |offsetSideband|int32[]|Specifies whether the offset segment is present on one side, or on both sides of the carriers. Specify NULL if you do not want to set a value for this array. |

RFMXSPECAN_VAL_SEM_OFFSET_SIDEBAND_NEGATIVE (0) Configures a lower offset segment to the left of the leftmost carrier.
RFMXSPECAN_VAL_SEM_OFFSET_SIDEBAND_POSITIVE (1) Configures an upper offset segment to the right of the rightmost carrier.
RFMXSPECAN_VAL_SEM_OFFSET_SIDEBAND_BOTH (2) Configures both negative and positive offset segments.

| :- | :- | :- | |numberOfElements|int32|Specifies the number of elements in each array.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetRBWFilterArray

int32 __stdcall RFmxSpecAn_SEMCfgOffsetRBWFilterArray (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 RBWAuto[], float64 RBW[], int32 RBWFilterType[], int32 numberOfElements);

Purpose

Configures the resolution bandwidth (RBW) filter of the offset segment.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
RBWAuto int32[] Specifies the array of RBWAuto which determines whether the measurement computes the RBW. Refer to the RBW and Sweep Time section in the SEM topic for more information about RBW and sweep time. Specify NULL if you do not want to set a value for this array.
RFMXSPECAN_VAL_SEM_RBW_AUTO_FALSE (0) The measurement uses the RBW that you specify in the RBW parameter.
RFMXSPECAN_VAL_SEM_RBW_AUTO_TRUE (1) The measurement computes the RBW.

| :- | :- | :- | |RBW|float64[]|Specifies the array of bandwidths, in hertz (Hz), of the RBW filter used to sweep the acquired offset segment, when you set the RBWAuto parameter to RFMXSPECAN_VAL_SEM_RBW_AUTO_FALSE. Specify NULL if you do not want to set a value for this array. | |RBWFilterType|int32[]|Specifies the array of shapes of the digital RBW filter. Specify NULL if you do not want to set a value for this array. |

RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_FFTBASED (0) No RBW filtering is performed.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_GAUSSIAN (1) An RBW filter with a Gaussian response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_FLAT (2) An RBW filter with a flat response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_SYNCHTUNED4 (3) An RBW filter with a 4-pole synchronously-tuned response is applied.
RFMXSPECAN_VAL_SEM_RBW_FILTER_TYPE_SYNCHTUNED5 (4) An RBW filter with a 5-pole synchronously-tuned response is applied.

| :- | :- | :- | |numberOfElements|int32|Specifies the number of elements in each array.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetRelativeAttenuationArray

int32 __stdcall RFmxSpecAn_SEMCfgOffsetRelativeAttenuationArray (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 relativeAttenuation[], int32 numberOfElements);

Purpose

Configures the attenuation, in dB, relative to the external attenuation.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
relativeAttenuation float64[] Specifies an array of attenuation values, in dB, relative to the external attenuation. Use this parameter to compensate for the variations in external attenuation when offset channels are spread wide in frequency. Specify NULL if you do not want to set a value for this array.
numberOfElements int32 Specifies the number of elements in each array.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetAbsoluteLimitArray

int32 __stdcall RFmxSpecAn_SEMCfgOffsetAbsoluteLimitArray (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 absoluteLimitMode[], float64 absoluteLimitStart[], float64 absoluteLimitStop[], int32 numberOfElements);

Purpose

Configures the absolute limit mode and specifies the absolute power limits corresponding to the beginning and end of the offset segment.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
absoluteLimitMode int32[] Specifies whether the absolute limit mask is a flat line or a line with a slope. Specify NULL if you do not want to set a value for this array.
RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_MANUAL (0) The line specified by the RFMXSPECAN_ATTR_SEM_OFFSET_ABSOLUTE_LIMIT_START attribute values as the two ends is considered as the mask.
RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_COUPLE (1) The two ends of the line are coupled to the value of the RFMXSPECAN_ATTR_SEM_OFFSET_ABSOLUTE_LIMIT_START attribute.

| :- | :- | :- | |absoluteLimitStart|float64[]|Specifies the absolute power limit, in dBm, corresponding to the beginning of the offset segment. The value of this parameter is also set as the stop limit for the offset segment when you set the absoluteLimitMode parameter to RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_COUPLE. Specify NULL if you do not want to set a value for this array.| |absoluteLimitStop|float64[]|Specifies the absolute power limit, in dBm, corresponding to the end of the offset segment. This parameter is ignored when you set the absoluteLimitMode parameter to RFMXSPECAN_VAL_SEM_OFFSET_ABSOLUTE_LIMIT_MODE_COUPLE. Specify NULL if you do not want to set a value for this array.| |numberOfElements|int32|Specifies the number of elements in each array.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

| :- | :- | :- |

RFmxSpecAn_SEMCfgOffsetRelativeLimitArray

int32 __stdcall RFmxSpecAn_SEMCfgOffsetRelativeLimitArray (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 relativeLimitMode[], float64 relativeLimitStart[], float64 relativeLimitStop[], int32 numberOfElements);

Purpose

Configures the relative limit mode and specifies the relative power limits corresponding to the beginning and end of the offset segment.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Identifies the RFmx session. You can obtain this parameter from the RFmxSpecAn_Initialize function.
selectorString char[] Comprises the signal name. If you do not specify the signal name, the default signal instance is used.

Example:

""

"signal::sig1"

You can use the RFmxSpecAn_BuildSignalString.
relativeLimitMode int32[] Specifies whether the relative limit mask is a flat line or a line with a slope. Specify NULL if you do not want to set a value for this array.
RFMXSPECAN_VAL_SEM_RELATIVE_LIMIT_MODE_MANUAL (0) The line specified by the RFMXSPECAN_ATTR_SEM_OFFSET_RELATIVE_LIMIT_START attribute values as the two ends is considered as the mask.
RFMXSPECAN_VAL_SEM_RELATIVE_LIMIT_MODE_COUPLE (1) The two ends of the line are coupled to the value of the RFMXSPECAN_ATTR_SEM_OFFSET_RELATIVE_LIMIT_START attribute.

| :- | :- | :- | |relativeLimitStart|float64[]|Specifies the array of relative power limits, in dB, corresponding to the beginning of the offset segment. The value of this parameter is also set as the stop limit for the offset segment when you set the relativeLimitMode parameter to RFMXSPECAN_VAL_SEM_RELATIVE_LIMIT_MODE_COUPLE. Specify NULL if you do not want to set a value for this array.| |relativeLimitStop|float64[]|Specifies the array of relative power limits, in dB, corresponding to the end of the offset segment. This parameter is ignored if you set the relativeLimitMode parameter to RFMXSPECAN_VAL_SEM_RELATIVE_LIMIT_MODE_COUPLE. Specify NULL if you do not want to set a value for this array.| |numberOfElements|int32|Specifies the number of elements in each array.|

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxSpecAn_GetError function.

The general meaning of the status code is as follows:
Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

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