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Search found 7 matches

by jmichel
May 9th, 2012, 3:41 pm
Forum: Nanovoltmeters
Topic: 2182A buffer-last reading is duplicate of the 2nd to last
Replies: 6
Views: 27988

Re: 2182A buffer-last reading is duplicate of the 2nd to las

Well, now I feel stupid. :oops: I believe I finally have the answer. All I had to do was put a really big number for the timeout on the RQS (polling the service request bit) in Labview. What was happening was that sweeps with slow readings were not finished until after the RQS had already timed out....
by jmichel
May 9th, 2012, 3:02 pm
Forum: Nanovoltmeters
Topic: 2182A buffer-last reading is duplicate of the 2nd to last
Replies: 6
Views: 27988

Re: 2182A buffer-last reading is duplicate of the 2nd to las

:x Ok, that's not it at all either. What's the deal here? The only thing that makes the behavior change is if I set NPLC low on both 2400 and 2182A. Or, if I set the trigger delays above a certain time. If I set NPLC levels low and trigger really fast, it won't duplicate the 2nd to last reading. If ...
by jmichel
May 9th, 2012, 2:03 pm
Forum: Nanovoltmeters
Topic: 2182A buffer-last reading is duplicate of the 2nd to last
Replies: 6
Views: 27988

Re: 2182A buffer-last reading is duplicate of the 2nd to las

I think I've finally got it now.

After the buffer is read, if I take it out of trigger mode with :TRIG:SOUR IMM I get all the data points on the next sweep.

If I don't do that, on the next sweep the 2nd to last data point is duplicated. If I do it, the next sweep runs fine. 8-)
by jmichel
May 9th, 2012, 1:13 pm
Forum: Nanovoltmeters
Topic: 2182A buffer-last reading is duplicate of the 2nd to last
Replies: 6
Views: 27988

Re: 2182A buffer-last reading is duplicate of the 2nd to las

Nope.

I was wrong. It stopped doing it for a while, but it's right back to doing it again.

So this is still an unsolved issue. :|
by jmichel
May 9th, 2012, 12:46 pm
Forum: Nanovoltmeters
Topic: 2182A buffer-last reading is duplicate of the 2nd to last
Replies: 6
Views: 27988

Re: 2182A buffer-last reading is duplicate of the 2nd to las

It seems that may have "solved" the problem. By doing :TRAC:CLE and then asking :TRAC:FREE? I get the message 18432,0\n meaning that there are 18432 total usable bytes in the buffer. If I ask for exactly that many bytes when asking :TRAC:DATA? I get all points as they should be every time (so far).
by jmichel
May 9th, 2012, 10:28 am
Forum: Nanovoltmeters
Topic: Triggering problems between 2400 & 2182a
Replies: 1
Views: 13613

Re: Triggering problems between 2400 & 2182a

I wonder if you're having a similar problem to mine. I get a duplicate reading in the last reading of the 2182A buffer as if it wasn't triggered but just sent the previous reading to the buffer. Sometimes it doesn't happen but most of the time it does. I've monkeyed around with the NPLC and trigger ...
by jmichel
May 9th, 2012, 10:13 am
Forum: Nanovoltmeters
Topic: 2182A buffer-last reading is duplicate of the 2nd to last
Replies: 6
Views: 27988

2182A buffer-last reading is duplicate of the 2nd to last

I am trying to do simple sweeps using a 2400 and 2182A and a trigger link cable, controlled using Labview 8.0 and GPIB. When I read the buffer from the 2182A most of the time, but not always, the last two readings in the buffer are the exact same reading, as in they are both positive when one should...

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