[volt-nuts] Volt Nuts Rookie

[Volker Esper]

Thank you for your suggestions.

Yes, I tried to identify the connection that is faulty. Though I 
mistrusted all mechanical contacts (relays and front/rear switch), my 
greatest fear was, that one of the PLCCs would be defective...

I opened the case and shortened all the closed contacts with an extremly 
low ohms short and the display changed significantly when coming to 
K101. Today I screwed up my courage and soldered a short wire across the 
contacts of this high voltage relay. It's been running for 12h now, 
without any wrong value.

So I've got to get one of those relays - Agilent says "orderable" at 
about 40 Euro. That's quite fair, I think.

Thanks so far

Volker


Am 21.05.2013 17:39, schrieb Don at True-Cal:
> Volker,
>
> I agree with the assessment that Frank gave you, that one or several high
> resistance connections between the terminals you are using and the
> connection to the main circuit board are at fault. This path would include
> the front/back switch itself and any low EMF slip-on connectors between
> front/back terminals and switch as well as from switch to main board. 4W
> measurements can correct for this increasing and varying path resistance but
> 2W measurements can't. I have seen this behavior in the 34401A and even the
> 3458A as well. It's an easy fix. You can probably find the offending
> connection by wiggling each while watching the 2W reading with a short on
> the terminals. If you see the problem on both front and rear terminals, the
> fault is between the switch and main board. If only on front OR rear, the
> fault is between that set of terminals and the switch. You will want to
> clean ALL connectors on both Input and Sense while you are inside.
>
> Hope this helps...
> Don @ True-Cal
>
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
> Behalf Of Frank Stellmach
> Sent: Tuesday, May 21, 2013 12:53 AM
> To: volt-nuts at febo.com
> Subject: [volt-nuts] Volt Nuts Rookie
>
> Hello Volker,
>
> welcome here.
>
> Currently, my 34401A shows a similar behaviour, on the rear connectors only.
>
> 2W Ohm there drifts up and down, several 10 digits in 6 digit mode, whereas
> the measurement is stable on the front connectors.
> 4W Ohm is stable even on rear connectors.
>
> Obviously, the front/rear switch is oxydized, or otherwise faulty.
>
> Please, check the measurement on the rear connectors also.
>
> Regards Frank
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