AnsweredAssumed Answered

vrf GPIB error

Question asked by VRFuser on Dec 6, 2007
I've seen instances where if you are sending a query command, say to acquire a measurement from a power meter, then you have a read command right after it in the I/O object, it helps to add a small delay between the 2 I/O transactions. Setting the Timeout under the General tab of the Advanced Instrument Properties has never really helped me when I've had these types of instrumentation quirks.
 
Recently I've seen a RF power meter that will freeze(comm timeout if you try to communicate with it) when the power to the sensor goes below a given level. Then when the RF power going to the sensor is increased all is well again. In this case my small delay between the query and read command mentioned above was of no help.
 
Ed Shaw
ATE Design Engineer

Comtech EFData Corporation
2114 West Seventh Street
Tempe, Arizona 85281
Tel. 480-333-2107
Fax 480-333-2525
eshaw@comtechefdata.com
http://www.comtechefdata.com



>>> Kevin Nievaart <Kevin.Nievaart@eng.monash.edu.au> 12/5/2007 5:44:25 pm >>>
Cheers Steve,
With my stuff it is the instrument that freezes - haven't tried a reset from software yet but if that works, I'll take your advice on board - sounds like a good idea to me.
And with the cabling problems, at least it sounds like there's no HYPERLINK "http://catb.org/jargon/html/magic-story.html"magic going on...  :P

--

Kevin Nievaart
Materials Testing Officer

Dept. Civil Engineering
Monash University, Clayton Campus
Ph.  (03) 9905-1165
Fax  (03) 9905-1483


"It is known that there is an infinite number of worlds, simply because there is an infinite amount of space for them to be in. However, not every one of them is inhabited. Therefore, there must be a finite number of inhabited worlds. Any finite number divided by infinity is as near to nothing as makes no odds, so the average population of all the planets in the universe can be said to be zero. From this it follows that the population of the universe is also zero, and that any people you may meet from time to time are merely the product of a deranged imagination."   -   Douglas Adams


Steve Ortiz wrote:


Hey Guys,
 
I hate to interrupt this fantastic discussion about cabling problems, but that's generally the last place problems emerge.  Yes, you can get bad cables and you can create problems with you network topology, but I've encountered far more problems with the instruments themselves non-behaving as expected. 
 
Instruments can do things like autocal that cause the instrument to non follow instructions for awhile.  The controllers inside the insturuments can crash or freeze.  Frank, do the instruments freeze (can you control them from the front panel?)when the failure occurs?  If so, you're in big trouble.
 
If the instruments don't freeze you can harden the code.  Add error outputs on the I/O boxes talking to the instruments.  When errors occur you can try giving the command again or give the instrument a clear or reset command.
 
Don't worry about rodents gwawing on your cables just yet, save that one for deeper troubleshooting.
 
Best regards,
Steve Ortiz
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--
--
Kevin Nievaart
Materials Testing Officer

Dept. Civil Engineering
Monash University, Clayton Campus
Ph.  (03) 9905-1165
Fax  (03) 9905-1483


"It is known that there is an infinite number of worlds, simply because there is an infinite amount of space for them to be in. However, not every one of them is inhabited. Therefore, there must be a finite number of inhabited worlds. Any finite number divided by infinity is as near to nothing as makes no odds, so the average population of all the planets in the universe can be said to be zero. From this it follows that the population of the universe is also zero, and that any people you may meet from time to time are merely the product of a deranged imagination."   -   Douglas Adams

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