[volt-nuts] hp 3456a ohms calibration

[Cowham, Chuck]

Ken,

Coincidently, I just recalibrated a pair of 3456A meters I have been running 24/7 for over a year.

10 V and 1 V ranges were no problem with adjustment pots having very good resolution.

1 K, 10 K, and 100 K pots were a little more fiddly.  I used 10 PLC averages for setting the pots, and then 100 PLC to re-check the setting was within 1 count.  Reading stability on these ranges with 100 PLC was 1 count, or less.

-- Chuck


-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of Ken Goodhew
Sent: Thursday, April 30, 2015 1:52 PM
To: volt-nuts at febo.com
Subject: [volt-nuts] hp 3456a ohms calibration

I have been trying to check the calibration of my HP3456A multimeter.

I can check and set the DC volts calibration ok but when I try and set the ohms calibration using standard resistors I cannot get a steady reading as the display varies by several digits regardless of the value of the resistance being used to check the meter.

I have already changed most of the power supply filter capacitors to see if this solved the problem, which it did not.

The only capacitors I have not changed are the two larger ones that tested ok for capacitance and esr.

Any suggestions as what the problem may be or where I am going wrong in my calibration attempts?

Thanks,

Ken Goodhew.

VK2TKE.

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