Hi group ! After long waiting for cheap listing with possibility to european delivery, at last win 200$ ebay "parts" hp3457a meter. Now only now need to find someone local with better equipment to check calibration :-}
Meter works fine, but I'm not sure how meter must behave in low voltage bands. If I short leads it show ~1uV, thats Ok. But if leads not connected then voltage slowly creep up from zero and after about 5 min grow to +3v and meter start to click relays trying to autorange. So look like somewhere inside is ~15GOhm leak to + voltage, i try to clean board with isopropyl , but no big changes. So is it normal (I doubt...) , because 10GOhm input impedance, or something is wrong and need to repair ? Any input will be appreciated! Juris yl3cb _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
