Amongst the stuff I recently acquired is a Fluke 332B (sn 4151). I found the manual for the 332D on the Fluke website, but can't find one specifically for the 332B apart from an incomplete US Army version. I have some questions: 1) Does anyone know where I can find the matching manual 2) If not, how useful is the 332D manual? 3) It was last calibrated in 2010, and appears to be consistently low in output (about 5mV at 100V, 25mV at 500V, 50mV at 1000V) after being on for an hour. Is that the sort of error I should expect after that period? 4) I'm leery of the chopper amp, did anyone (Dr. Frank?) do a retrofit using a modern chopper op-amp or similar? Thanks Dave

The 332D and the 332B are identical except for the accuracy specs for

332B spec for 10 Volts is +/- .002% (20 ppm) for 90 days while the 332D

I suspect that FLUKE simply aged and selected a more stable reference

I seem to remember someone replacing the chopper assembly with something

One thing I did find is that the electrolitic caps have a high tendency

David: The 332D and the 332B are identical except for the accuracy specs for the stability of the output voltages. 332B spec for 10 Volts is +/- .002% (20 ppm) for 90 days while the 332D spec for 10 Volts is +/- .001% (10 ppm) for 60 days. The monthly drift specs are also slightly better on the D than the B. I suspect that FLUKE simply aged and selected a more stable reference device along with matching the resistors in the sampling string for less drift. For all of that you paid US$2,595 for the 332B and US$2,995 for the 332D in 1973. I seem to remember someone replacing the chopper assembly with something a little more modern. Don't know where I saw that. I have a B and a D and both seemed to be very stable with the existing chopper assembly. One thing I did find is that the electrolitic caps have a high tendency to go bad. Not the big ones on the raw supply but those on the various plug in assemblies. I seem to remember that they were in a range of 1 ufd to 47 ufd or so. So check them all or better yet just recap. You will save yourself a LOT of troubleshooting time in the long run. There is also a discussion of this subject either on VoltNuts or EEVBLOG. Bill ----- Original Message ----- From: "David C. Partridge" <david.partridge@perdrix.co.uk> To: "'Discussion of precise voltage measurement'" <volt-nuts@febo.com> Sent: Saturday, July 08, 2017 5:09 AM Subject: [volt-nuts] Fluke 332B > Amongst the stuff I recently acquired is a Fluke 332B (sn 4151). > > I found the manual for the 332D on the Fluke website, but can't find one > specifically for the 332B apart from an incomplete US Army version. > > I have some questions: > > 1) Does anyone know where I can find the matching manual > > 2) If not, how useful is the 332D manual? > > 3) It was last calibrated in 2010, and appears to be consistently low in > output (about 5mV at 100V, 25mV at 500V, 50mV at 1000V) after being on for > an hour. Is that the sort of error I should expect after that period? > > 4) I'm leery of the chopper amp, did anyone (Dr. Frank?) do a retrofit using > a modern chopper op-amp or similar? > > > Thanks > Dave > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

Hello Dave, Am 08.07.2017 14:09, schrieb David C. Partridge: > 4) I'm leery of the chopper amp, did anyone (Dr. Frank?) do a retrofit > using > a modern chopper op-amp or similar? You may want to have a look at this thread: https://www.eevblog.com/forum/testgear/fluke-332baf-in-the-slaughterhouse/ http://www.friedrich-messtechnik.de/index.php/bauanleitungen/87-fluke335-332 (sorry, it is German) I have created some PCBs based on the schematics shown on this website. If you are interested, I can send you one for the shipping costs. It is working well in my Fluke 3330B which is using the same design as the 332. Regards, Andreas

On 08/07/2017 21:36, Andreas Bergmann wrote: > Hello Dave, > > Am 08.07.2017 14:09, schrieb David C. Partridge: >> 4) I'm leery of the chopper amp, did anyone (Dr. Frank?) do a retrofit using >> a modern chopper op-amp or similar? > > > You may want to have a look at this thread: > https://www.eevblog.com/forum/testgear/fluke-332baf-in-the-slaughterhouse/ > > http://www.friedrich-messtechnik.de/index.php/bauanleitungen/87-fluke335-332 (sorry, it is German) > > I have created some PCBs based on the schematics shown on this website. > > If you are interested, I can send you one for the shipping costs. > > It is working well in my Fluke 3330B which is using the same design as the 332. > > Regards, > > Andreas > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > . > Hi Andreas, I also have a 3330B which could do with an updated chopper PCB, how many spare boards do you have ( I only need 1) Regards, M K