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We are using the Ni 9229 to measure a 13V, 30msec pulse and the measurement jumped to 4V came back down to 1.5V and rose exponentially to 7V any ideas on how to troubleshoot this? thanks Bill
In response to you most recent question, the second symbol is earth ground as opposed to chassis ground. The main point is that the source is grounded in such a way that will not introduce ground loops, but is stable enough to not cause the behavior you saw earlier. Please let us know if you're still seeing issues after following the diagrams posted by snowpunter.
Thanks!
Will Hilzinger | Switch Product Support Engineer | National Instruments