hector_carbossa - 13-1-2009 at 14:39
Hi,
today I found this instruments. It seems a small pc tower, has red 7 lines display, various ports on rear and various regulations.
"Input" port seems to be gold plated coaxial SMA connector but I'm not sure. This time I'm not sure about nothing.
Someone knows this stuff? What's minimum setup? Which probe I've to use?
I haven't taken it yet for reason I imagine have not to explain.
Probably I dreamt may be useful measuring 10^-12 A currents, so I thought I may use normal TV coaxial cable as probe (high voltage seems main reason
for those cables usage).
But as I stated this is dreaming thought
What do you think/know about?
densest - 19-1-2009 at 09:52
Can you post some pictures? Or some of the text like a manufacturer's name and model number, the labels on the displays, etc.
A picoammeter usually uses Teflon/PTFE insulated cable for low leakage. The connector will give some clues: if it has contacts for two coaxial
(concentric) shields, it would require a special probe and cable - the inner shield is called a "guard" and it is driven by an amplifier from the
signal in order to reduce the leakage from the signal wire.
hector_carbossa - 20-1-2009 at 23:05
Hi.
Here some pictures. In truth, I've found an half solution, so, I powered on this old equipment with nixie tubes. As probe, truncated coaxial cable
seems to work well, measuring 5 uA on analog display for a exhaust 1 V button battery (but I have to do better tests with some known resistors).
Overview
Front
Back
Things may be interesting are those DB25 and DB9 ports.
jimwig - 21-1-2009 at 12:27
take it and sell it to me
jimwig - 21-1-2009 at 12:56
[Edited on 21-1-2009 by jimwig]
hector_carbossa - 24-1-2009 at 01:22
Amazing.. this may be a dream. What would you do with my funny picoammeter?
