Hello
I have recently acquired a Keithley 2110. This is the same meter as the picotest M3510A. It is 5.5 digit basic bench meter
The unit I had was listed for parts ,but had a working display(cant bet too bad to fix, I thought,
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/xgrin.gif.pagespeed.ic.QVVz6XIT20.png)
). Made an offer and got the meter.
The good news is ,it partially works .Im not looking for anything cal lab level ,but something that works and help out with my hobbyist needs.
Review by Gerry Sweeney here -
I have opened up and looked . My suspicion is the Amps protection /range switch ., I also found the a nice copper power ground pin (near the 400V AC Capacitor),and all DC voltages/ Ohms relative to this are accurate.
System has a 602 Ram Self Test error ( No option to skip or pick tests in this meter
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
). Skipping this issue for now,till the Front Ends are ok.
Current State
DCV - Has a 0.170v offset from power ground as measure on Input Low. Nulling this out ,meter measures ok. When measuring with Input Hi and Power ground ,voltages look good . Checked the AD584 and Max 6341 references.
ACV - seems ok , but has small mV level offset .
Currents -Havent tested ,but seems to have some offset.
Ohms - 2W . With the Input Low/ Hi jacks. each range seems to have a different ohmic offset . When measured between Input Hi/power ground copper pin , it works to good accuracy .I have a few .01% resistors and they all look good
Freq - Works
Cap - Does not work ,always "OVld".
RTD /Thermocouple - Works (Note this is an independent measurement circuit on front panel) . I used a k type probe on components and they were all 30-40 C
I read this post
https://www.eevblog.com/forum/testgear/0-2v-offset-on-dc-measurements-with-picotest-m3511a-dmm/ ,seems to be similar but not same as that meter has more items that work.
I need suggestions to check and maybe help with some components . What is Q208/Q209 A22 ( maybe a mosfet / jfet , the picotest has it as a 703w/F2GZA , Keithley has it as A22 for both ). Heating the part changes the offset .
Pictures !!