I have repaired a Keithley 610C Electrometer and made a video - Page 1
Forum section: electronics / repair

author: baltersice
author_rank: Regular Contributor
timestamp: December 05, 2016, 02:37:02 pm
content: The fault was extremely simple in the end, not even worth a video.But the footage was too good for the trash, so this came out:I got that meter for roughly 30$ from eBay, perfect condition but non-functional.The first thing I checked was the discrete amplifier module, where a diode had shorted.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 05, 2016, 08:12:13 pm
content: Very nice presentation of this repair.Thank you for sharing.

author: dacman
author_rank: Frequent Contributor
timestamp: December 06, 2016, 12:12:23 am
content: Nice video. Something I noticed was the rear output switch was set to 1 MA. The 1 MA / 3 V switch on the back is supposed to be set to 3 V if the output isn't connected to a 1 MA recorder. There is a note about this in section 2-1 of the 610C manual.

author: The_Penguin
author_rank: Regular Contributor
timestamp: December 06, 2016, 12:26:34 am
content: Awesome video. The intro was almost pornographic.The build quality, and looks as clean as the day it was made. Wow.

author: Vgkid
author_rank: Super Contributor
timestamp: December 06, 2016, 04:13:25 am
content: Nice job on the fix. Always wanted an electronometer to mess around with, but wouldn't have much use for it.

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 06, 2016, 03:12:56 pm
content: Liked your video.I bought a Keithley Model 210 Vacuum Tube Electrometer this summer at a yard sale.Needs a lot of work and I believe a few almost unavailable accessories to operate properly.Hope to get to this early next year.

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 06, 2016, 06:54:17 pm
content: What accessories? It's just a special voltmeter isn't it? If it needs some sort of attenuated probes you could probably just make some.

author: quarks
author_rank: Frequent Contributor
timestamp: December 06, 2016, 07:05:44 pm
content: very nice

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 06, 2016, 08:50:43 pm
content: Accessories to make it more complete; Ohms, Amps, High Voltage

author: lowimpedance
author_rank: Super Contributor
timestamp: December 07, 2016, 01:21:46 am
content: That is indeed an oldie,, whats the odds of ever finding any of those accessories I wonder !.Good luck with the restoration.

author: VintageNut
author_rank: Frequent Contributor
timestamp: December 10, 2016, 03:44:17 pm
content: Quote from: Johnny10 on December 06, 2016, 08:50:43 pmThere is a shunt for the model 200 on eBay. Not sure if this is a drop in for the model 210.http://www.ebay.com/itm/Keithley-2001-ElectroMeter-Shunt-for-200-Vacuum-Tube-Electrometer-Priority-SH-/232162654709?hash=item360df8f9f5:g:kzIAAOSwl9BWK3~3You applications posting is very cool. I have an original model 210 paper manual. The manual was produced in September 1957.

author: schopi68
author_rank: Regular Contributor
timestamp: December 30, 2016, 02:54:34 pm
content: Just to metion: replacing the transistor in diode configuration with an standard diode does not complete the repair work.A diode-connected transistor has a very low reverse leakage current (what is an important aspect in applications with high input impedance).