Fetches the 20dBBandwidth measurement results.

Syntax

int32 __stdcall RFmxBT_20DBBandwidthFetchMeasurement(niRFmxInstrHandle instrumentHandle, char selectorString[], float64 timeout, float64 *peakPower, float64 *bandwidth, float64 *highFrequency, float64 *lowFrequency)

Parameters

NameDirectionTypeDescription
instrumentHandle[in]niRFmxInstrHandle

This parameter specifies the RFmx session refnum. This parameter is obtained from the RFmxInstr_Initialize function.

selectorString[in]char

This parameter specifies a Selector String comprising of the signal name and the result name. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name, the default result instance is used. The default value is "" (empty string).
Example:
"signal::sig1"
"result::r1"
"signal::sig1/result::r1"
You can use the RFmxBT_BuildSignalString function to build the selector string.

timeout[in]float64

This parameter specifies the timeout for fetching the specified measurement. This value is expressed in seconds. Set this value to an appropriate time, longer than expected for fetching the measurement. A value of -1 specifies that the function waits until the measurement is complete. The default value is 10.

peakPower[out]float64 *

This parameter returns the peak power of the measured spectrum. This value is expressed in dBm.

bandwidth[out]float64 *

This parameter returns the 20dB bandwidth of the received signal. It is computed as the difference between High Frequency and Low Frequency parameters. This value is expressed in Hz.

highFrequency[out]float64 *

This parameter returns the highest frequency above the center frequency at which transmit power drops 20 dB below the peak power. This value is expressed in Hz.

lowFrequency[out]float64 *

This parameter returns the lowest frequency below the center frequency at which transmit power drops 20 dB below the peak power. This value is expressed in Hz.

Returns

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 RFmxBT_GetError function.

The general meaning of the status code is as follows:

Value

Meaning

0

Success

Positive Values

Warnings

Negative Values

Errors