FETCh3:{THDNoise|THDistortion}? [<record #>, [<first_pt>, [<length>,]]] (@<channel>)
Performs post-processing calculation on the specified range of readings and returns THD noise/distortion on the
specified record for a channel.
The minimum data points to perform the post-processing calculation is 256 data points. For valid post
processed measurement, please ensure data captured is at least 1 cycle.
The <length> will be round down to the lower 2
n
number, if the number enter is not 2
n
.
This SCPI is supported on the DAQM909A Digitizer module only.
Parameter Typical return
<record #> = An integer indicating the specified record for a channel.
Default: 1
<first_pt> = An integer indicating the first data point of the range of readings to perform
post processing calculation to obtain the statistics.
Default: 1
<length> = An 2
n
integer (256, 512,1024, 2048, 4096, …., 65536) indicating the number of
data points to perform post processing calculation to obtain the THD noise/ distortion.
Default: 256
<channel> = Channel number
(none)
Returns the THD noise of 256 readings starting from the second data point in the first record of Digitizer channel 201.
FETCh3:THDNoise? 1,2,256,(@201)
Typical response: -3.16766701E+01
138
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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