How can I measure a current continually after switching it to a DMM?

Whether a current could be measured continually after switching it to a DMM? How to write the scan list?
I tried many times and failed.
Thanks advance
小木虫

Hi 小木虫,
Ignore my first reply. I misunderstood your question and provided an example of how to create a "make before break" scan list entry. You do not need this for your application. I think "break before make" will suffice.
I now understand that you want to make multiple current measurements after creating a switch connection. The scan list entry you provided: r2->c0 & r3->c1; will create the connection required for the DMM to measure the current flowing between c0 and c1. However, the DMM will send a trigger back to the switch after making its first measurement.
One way to make multiple measurements is to create multiple connection entries in the scan list. Each scan list entry triggers the DMM to make one measurement. I don't like this idea much, as it will actuate the relay many times (once for each measurement).
Is hardware-timed operation necessary? If you used a switch software trigger, you could make the scan list connection (r2->c0 & r3->c1; ) and then begin a DMM multi-point acquisition. Once you've collected all the required current measurement samples, you could send another switch software trigger to continue with the next scan list entry.
Will this work?
Chad Erickson
Switch Product Support Engineer
NI - USA
Message Edited by Chad PSE on 02-20-2009 01:51 PM

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