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EEVblog #170 - Agilent FAIL!

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pmrlondon:
Well, that is some proper weirdness there with that meter. I hope it turns out to be something simple, at least in explanation, as odd faults like this can be a pain to track down.

The stuck readings remind me of my Precision Gold WG021 - that could be odd like that sometimes - but it was manual range and more obviously wrong when only the decimal point moved.

Bored@Work:
It looks like a microcontroller in that thing is running wild. Of course this assumes there is a microcontroller in it. My first suspicion would be something wrong with the brownout detection or reset circuit.

Kiriakos-GR:
Just watched the video, and actually three times..

Well I am a bit confused .

I have see the pictures of PetrosA teardown ,  and still I do not have understand , if the LCD is on a separate PCB ?
or how it connects with the PCB.

From my own experiences , if there is an connection problem , between the main PCB with the secondary for the display,
or even if the rubber zebra is not in place 100%  , or even if an common hair of our head, drops in the path of the rubber zebra , it could lead to issues.

I have not get my own sample yet ( still in mail ), and I can not offer any test results.
   
Dave , just recheck the unit ...  inspect the connection ( display & PCB ) and use an magnifier glass too.

 
 

saturation:
I am evaluating the same meter myself and have run into problems.  Nothing permanent and major, but certainly problematic for such a high priced meter, at a price were there are other competitors with no known issues that would make one skeptical about its long term reliability for making accurate measurements.

In the middle of testing, once or twice in 10s of hours of testing, while I switched from range to range, it did go berzerk briefly as the switch hung between ranges, then became right again once it was in seated in the range.  I also had it once read hundreds of Vac in the low Z range as I quickly switched from range to range and it was again, not seated fully in the range setting, and the leads were not connected.  I would not have thought much of these 'glitches' as I haven't been able to repeat it and its only happened, maybe no more than 3x, but reading Dave's comments and video, I'll now concentrate on seeing if I can repeat them consistently.

But this is with several days and multiple hours of testing, and it working right now.  Not sure what the cause is, and I continue to stress it.

I have not taken it apart.

The importance to me is, is before I take this DMM on a mission critical trip, it better live up to basic accuracy that is rock stable.

I'm glad to see that in Dave's test unit, there is no problem with Vdc calibration.

Mechatrommer:
where is eevblog #170. is it missing? or is it just me?

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