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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Ash Small wrote ...
You don't think connecting a signal generator to the co-axial input is necessary then? I know the General Radio GR650a, etc require an external signal generator, and that might explain the prescence of the co-ax socket (just a thought).
I s'pose that's possible, Ash, but I had the impression that the bridge was excited by the 50 Hz power line frequency. The thing to do is first establish that the bridge functions correctly when measuring known resistances. Then test it against known capacitances in the appropriate ranges.
If all this functions reasonably well, you should get the feel of the thing, and be in a better position to test its inductance range.
Registered Member #3567
Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
Don't keep us in wait, Mr. Small.
As a certain annoying repairman would say, Get Er' Done!
Worst things worst, you blow the breaker and the caps go boom. Nothing like turning on a half century device and waking up to a stream of fire, tinfoil, and wax!
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
It looks like a R-C bridge with the Ferranti transformer (radio output?) wired to provide AC independent of earth to excite the bridge.
The coax socket might be for a scope or VTVM to provide a better null than than the electron ray tube.
The PF pot is for measuring the power factor of large value capacitors and appears connected in series with the oil capacitor that would be the range capacitor for the high C range.
You null the value of C on the big dial and then get a better null with the PF pot and then, using both hands tweak both for final reading.
It looks like something a TV repair shop in the 50's would have.
Draw out the schematic, those things are very simple
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
Hmm... That looks a little like this! Maybe you can gather some good information from the faceplate on this one. I have actually been using this one for some time. (It actually works really well!) Yours might be worth a little restoration. For novelty, conversation, non critical use. I personally think its cool!!!
Registered Member #3567
Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
That is a nice condition Heathkit. If you look around, you might find the model number. Go on a site called BAMA, and fine the manual for it. replace all the paper caps and e caps, they will go bad one day and cause it to go BOOM. It will also make the tester more accurate. Check to see what model eye tube you have in there, a good one will be worth more than the tester!
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Resistance/Capacitance Meter (with valves (tubes))
