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3458A digitizing/external trigger

Question asked by anon1122 on Apr 29, 2013
Hello,

I am trying to synchronize the digitizing of two 3458A multimeters. What I have tried to do is set the first one to send EXTOUT APER -signal to the other multimeters ext trig -connecter when the first one starts digitizing. The first one is triggering ok, but the other is triggering the measurement almost randomly. I am trying to measure phase between the signals. The extout aper -signal seems to apper correctly when the first multimeter starts digitizing (checked with an oscilloscope).

Simplified sample code (without dcv-range, sweep and aper commands)

*DMM1:*
PRESET DIG;
TARM HOLD;
MEM FIFO;
MFORMAT DINT;
OFORMAT DINT;
LEVEL 0,DC;
EXTOUT APER;

*DMM2:*
PRESET DIG;
TARM HOLD;
MEM FIFO;
MFORMAT DINT;
OFORMAT DINT;
TRIG EXT;
MEM FIFO;
TARM SGL;

*DMM1:*
MEM FIFO;
TARM SGL;
...read DMM1 results here...

*DMM2:*
...read DMM2 results here...

Any suggestions?  

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