By the way: does anyone know, if Agilent uses special solder alloy? I've
heard that a cadmium containing solder is used to get extremely low
thermoelectric voltages (or voltage differences).
Is that right? If so, which alloy has to be used?
Thanks
Volker
Am 30.05.2013 03:29, schrieb 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@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: [email protected] [mailto:[email protected]] On
Behalf Of Frank Stellmach
Sent: Tuesday, May 21, 2013 12:53 AM
To: [email protected]
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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