AnsweredAssumed Answered

vrf Adding delay to E8460A

Question asked by VRFuser on Apr 12, 2004
Yes - give current a chance to flow... You may check by using a Resistor
(10k ... 100k) parallel to your signal input. if the signal is stable then,
it's an impedance problem. If not, check our ground/shield concept. Floating
grounds are highly sensitive to all types of electromagnetic interference
which may look identical to a non-stable signal.

/Stefan


DUNSMORE,JOEL (A-Sonoma,ex1) schrieb:

> Also, it could be settling of the "DUT" (device under test).  I've seen this before when using a switch to measure one of several DUTs.
> The problem arises when the switch impedance is different between on and off states, and the DUT is one that cares about load impedance.
> In such cases, the DUT must settle before the reading will look good.

> Joel
>
> -----Original Message-----
> From: Les Hammer [mailto:Les.Hammer@CompleteTest.com]
> Sent: Monday, April 12, 2004 12:44 PM
> To: VRF
> Subject: [vrf] RE: Adding delay to E8460A
>
>
>>  My dilemma is that I am having to add delay (about 400ms) after closing a mux channel 
>> before taking the reading with the 4263 or I get an incorrect reading.

> What are the specs on the 4263?  How long does the input need to be applied for it to autorange and take a reading?
> Are you autoranging or setting a fixed range? 
>
>  >  Thinking that the E8460A mux I am using is the bottle neck I added  
>
>>  a  *WAI statement which appeared to have no effect. 
>
> The *WAI for the E8460A is a NOP if you are using the command module.  The other code versions check a regster.
>
>>  I don't think I should have to wait more than about 50ms for relay mux channel closure !!!
>
> The E8460A spec says it switches in 0.5ms --> 1/100 of your patience.  I don't think that it is the problem.
>
>> Can anyone give me a clue what I could be doing wrong. ?  
>
> My bets are on the 4263.  If you are not setting it to a fixed range, try that first.
>
> Les Hammer
> Partner
> Complete Test
> 720 SW 14th St.
> Loveland, CO.  80537
> Les.Hammer@CompleteTest.com 
>
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Mit freundlichen Gren / With kindest regards

Stefan Paulick

stefan.paulick@urbeli.com
http://www.urbeli.com
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