Electronics > Projects, Designs, and Technical Stuff
Mystery tin resistor box
enut11:
What is this tin 'resistor' box and what equipment may it have been part of?
It has 13 terminals and marked 13071.
Size is 9 x 3.5 x 3.5cm
enut11:
All the connection points appear to be connected by resistors mainly.
Measuring connector-to-connector:
1-2 3809 ohms
2-3 2999 ohms
3-4 short
4-5 9 ohms
5-6 short
6-7 1060 ohms
7-8 4062 ohms
8-9 1903 ohms
9-10 4060 ohms
10-11 1132 ohms
11-12 75 ohms
12-13 75.5 ohms
ChristofferB:
Interesting! Well my first guess would be a resistance standard from some high-end test gear.
But that assumes that it litterally IS just a resistance box. Just because there are some measurable resistances doesn't necessarily mean it's only resistors inside.
The values seems strange for a meter reference, one would expect a larger range, from milliohms (or short) to multi-megaohms.
Can you measure capacitance? It could be RC networks for timing.
coromonadalix:
Maybe a resistor network for some instrument ... like a frequency generator ?
Can you shoot some photos from the bottom, is it completly sealed off ?
Stranges values indeed
Gyro:
You're missing quite a lot of measurements there, you've only measured between adjacent pins. Don't necessarily assume that it is internally wired as just resistors between adjacent pins, you might be measuring combinations. For instance, the pairs reading short might be common connections for a bunch of resistors to other pins. Try a some more probing combinations and the values might suddenly make more sense.
Edit: Or 3+4 and 5+6 might be kelvin sensed connections to the 9R resistor.
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