Fluke 341A DC voltage calibrator - Page 1
Forum section: electronics / general

author: feedback.loop
author_rank: Frequent Contributor
timestamp: November 26, 2015, 11:24:22 pm
content: Check out this repair video. Nice vintage piece of precision gear from 1970s. Not a metrology lab grade, of course, but still very cool 6 digits 0.005%. A few capacitors failed, but otherwise still in spec.

author: Vgkid
author_rank: Super Contributor
timestamp: November 27, 2015, 05:07:08 am
content: Good job on the repair, amazing that some measurements are almost still within the recently calibrated specs.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: November 29, 2015, 06:35:21 pm
content: By the way, I wonder what do the voltage reference gurus on this forum think about the SZA263 used in this calibrator?

author: HighVoltage
author_rank: Super Contributor
timestamp: November 29, 2015, 08:23:17 pm
content: Quote from: feedback.loop on November 26, 2015, 11:24:22 pmThanks for another great video.Well, it might not be a metrology grade equipment today, but I think in the 70's it was for sure metrology grade.Especially since most voltmeters were analog in those days.

author: splin
author_rank: Frequent Contributor
timestamp: November 29, 2015, 10:25:53 pm
content: At 11:30 the 34401A is shown measuring 30uV AC of noise - but the 34401A becomes very inaccurate below 1mV and wildly so below about 100uV AC according to this:http://www.gellerlabs.com/34401a%20ac%20zero.htmIt looks like the Tektronix scope has a problem calculating RMS voltages at low levels - at 12:27 after reducing the b/w to 20MHz it shows the peak-peak value to be mostly similiar to (or below) the RMS value which is unlikely (to impossible). Not that it matters at those levels.

author: dacman
author_rank: Frequent Contributor
timestamp: November 30, 2015, 03:13:24 am
content: 30D series Sprague capacitors have been made since the 1960's (at least) and still are being made. That 5uF 25V cap is a TE1202 and is available at several parts places (Newark, Allied Electronics, Mouser, Amazon.)Those Kelvin Clips for the LCR meter look fairly decent. Is the blade connector custom or would it fit a DE-5000?

author: feedback.loop
author_rank: Frequent Contributor
timestamp: November 30, 2015, 06:42:09 pm
content: Quote from: dacman on November 30, 2015, 03:13:24 amRegarding 5uF caps. The exact capacitance is not critical there, so 6.8uF should do just fine.Regarding the LCR meter. I really don't know much about DE-5000. The meter I have is Tonghui TH2822C. Here is a teardown:https://www.eevblog.com/forum/testgear/tonghui-lcr-meter-teardown-is-bk879b-just-a-rebranded-meter/

author: Seekonk
author_rank: Super Contributor
timestamp: November 30, 2015, 07:25:12 pm
content: I have one of those calibrators and havent turned it on in a while. When I got it half a dozen plastic spacers of the waffer switches were broken. That was dicey getting those in without unsoldering anything.

author: EC8010
author_rank: Frequent Contributor
timestamp: May 04, 2022, 04:04:16 pm
content: I see that your Fluke has a missing (presumed broken) right rack mount handle. Mine had a smashed left hand handle, so I removed them both. Would you like an unbroken handle?

author: feedback.loop
author_rank: Frequent Contributor
timestamp: May 04, 2022, 04:13:57 pm
content: Quote from: EC8010 on May 04, 2022, 04:04:16 pmApparently you did not watch the video.My handle is fine, thank you.

author: EC8010
author_rank: Frequent Contributor
timestamp: May 05, 2022, 11:26:10 am
content: Actually, I did. But I note that you've edited your post to show a new still image.I'll keep the undamaged handle just in case.