RFmxWCDMA_SEMFetchSpectrum
- Updated2024-10-14
- 2 minute(s) read
RFmxWCDMA_SEMFetchSpectrum
int32 __stdcall RFmxWCDMA_SEMFetchSpectrum (niRFmxInstrHandle instrumentHandle, char selectorString[], float64 timeout, float64* x0, float64* dx, float32 spectrum[], float32 relativeMask[], float32 absoluteMask[], int32 arraySize, int32* actualArraySize);
Purpose
Fetches the spectrum used for the SEM measurement.
Parameters
| Input | ||
| Name | Type | Description |
| instrumentHandle | niRFmxInstrHandle | Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxWCDMA_Initialize function. |
| selectorString | char[] | Specifies a selector string comprising of the signal name and 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. Example: "signal::sig1" "result::r1" "signal::sig1/result::r1" You can use the RFmxWCDMA_BuildSignalString function to build the selector string. |
| timeout | float64 | Specifies the timeout, in seconds, for fetching the specified measurement. 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. |
| arraySize | int32 | Specifies the size of the array. Set the arraySize parameter to 0 to get the size of all the arrays in the actualArraySize parameter. |
| Output | ||
| Name | Type | Description |
| x0 | float64* | Returns the start frequency. This value is expressed in Hz.
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| dx | float64* | Returns the frequency bin spacing. This value is expressed in Hz.
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| spectrum | float32[] | Returns an array of averaged powers measured at each frequency bin. The value is expressed in dBm.
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| relativeMask | float32[] | Returns an array of power levels for relative mask. The value is expressed in dBm.
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| absoluteMask | float32[] | Returns an array of power levels for absolute mask. This value is expressed in dBm.
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| actualArraySize | int32* | Returns the actual size of the array, if you pass NULL to all output array parameters, and set the arraySize parameter to 0. |
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 RFmxWCDMA_GetError function. The general meaning of the status code is as follows:
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