Products > Test Equipment
Old Fluke Multimeters
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vinlove:
My 8000A has a lot of problems. I had opened separate thread for it.
It would be really cool if it works with reasonably accuracy.

Maybe it needs full recap, and upgrade of the PSU?
Martin.M:
8300A Nixie Fluke. Options 1+2 (  mV/Ohms card + AC card)

I found a problem:

DC Test: OK
AC Test: OK
mV Test: OK
Ohms: to low + floating

dou you have a tip for me?

mV is common used with Ohm, so this part is allready working. It can be anything around the current source what is required to test resistors.

greetings from germany
Martin

edited:

Range switches kOhm:

1000 works
100 works
10 fail
1 fail

it can be interconnection, or the A3 transistor array what drives the both reed relays. on the mV Ohms card.
tautech:

--- Quote from: Martin.M on January 12, 2020, 07:38:38 am ---8300A Nixie Fluke. Options 1+2 (  mV/Ohms card + AC card)

I found a problem:

DC Test: OK
AC Test: OK
mV Test: OK
Ohms: to low + floating

dou you have a tip for me?

mV is common used with Ohm, so this part is allready working. It can be anything around the current source what is required to test resistors.

greetings from germany
Martin

edited:

Range switches kOhm:

1000 works
100 works
10 fail
1 fail

it can be interconnection, or the A3 transistor array what drives the both reed relays. on the mV Ohms card.

--- End quote ---
Check them, they do give up after years.
Member Defpom had trouble with one in his Tek 851.
IIRC it was in Pt2 of 3
Martin.M:
found it: a bad gold pin. will be replaced by one from TP  ;)
MarkMLl:

--- Quote from: tautech on January 12, 2020, 10:06:29 am ---Member Defpom had trouble with one in his Tek 851.

--- End quote ---

Thanks for that link: the infamous BDM ("Burroughs Digital Meter") 1250. Just by chance I spotted this a few days ago, referring to a predecessor instrument (BDM 1200) which I'd not previously come across:

https://www.ebay.co.uk/itm/383449915730?ViewItem=&item=383449915730

A number of people discussing these things bemoan the fact that they didn't have a CRT for even minimal 'scope functionality. The background however is that while field engineers were expected to do component-level repairs the factories producing the various computers were expected to also produce a set of Maintenance Test Routine (MTR) procedures, and while some of these were based on software and others assumed the availability of a special card tester (carried by the higher-grade FEs) others "simply" had the instructions to put the hardware into such-and-such a state and then count the number of pulses at such-and-such a point when a button was pressed. Hence the various counting functions visible on both the BDM 1250 and the earlier BDM 1200 photos.

Of course, some of this method of faultfinding was inspired by the fact that many of the electromechanical terminals and accounting systems had serial ALUs, with their main memory being a small head-per-track disc drive. This sort of thing was sold in large quantities into banks: even the smallest branch would have a TC500, hooked via a multidrop line to the central mainframe sites.

It's also worth noting that many of the Burroughs computers of that era used a "made specially for us" logic family (actually Fairchild CTL) with split-rail supply (+4.75 -1.25 IIRC) and most of the faultfinding procedures specified that test equipment's protective ground should be disconnected at the mains plug. I had the misfortune to work for them at the time, and we were given warning notices to display lest we killed ourselves.

MarkMLl
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