Hi everyone,
I'm testing the NI-PXI 5922 to check if it is suitable for my application.
In particular, I want to measure a pulsed waveform ranging from -1.7 V to 0 V and I would like to use the minimum allowed range (± 1 V) since I’m actually interested just in the higher part of the signal (around 0 V).
I developed a LabVIEW software that performs a triggered acquisition so I’m sure that, when the trigger occurs, the signal is well inside the ± 1 V range (no pre-trigger samples are acquired); attached, you find a sketch of the acquisition configuration.
The result is that I get the following warning:
“Code: 1074115590
ADC for one or more channels was overloaded. Your data might be invalid.”
Of course, if I repeat the same acquisition with the ± 5 V range, there is no warning anymore.
The waveforms acquired with the two different ranges, attached in this message, are pretty different for about the first 50 us. With the ± 1 V range there is an overshoot that I think is due to the recovery of the board from the overload condition.
Do you know if there is any way of disabling the board’s channel (with all its circuitry) until the trigger occurs in order to avoid the overload condition (and the resulting recovery)?
