04-30-2021 04:56 AM
Hello,
I am trying to messure two singals. They have diferent references.
Signal 1: Sine 40hz, current signal converted to voltage with a 1M resistor, - is connected to the case of the machine that produce it
Signal 2: Sine20hz, generated by a signal generator
When I have the two signals on, the second signal ist disturbed by the first. The resultant waveform seems to be the addition of the two.
When I turn off one of the signals, I can see the activated signal in both of the channels.
Things I have tried:
1. Connect the two - terminals together, connect them to the COM port and RSE measurement: Problem is present.
2. Connect the two - terminals together, then connect that tru a 1M resistor to the COM. Aditionally connect the - Terminals to the corresponding diferential port and diferential measurement: Problem is present.
3. Connect the two - terminals together tru a 1M resistor, then connect that to the COM. Aditionally connect the - Terminals to the corresponding diferential port and diferential measurement: Problem is present.
Can some one nudge me in the right direction, how can I connect the signals?
04-30-2021 07:08 AM
I tried also following this guide, but my device do not allow the use of duplicated channels
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YHy6CAG&l=de-DE