On 1/16/2014 3:56 AM, N_Cook wrote:
Otherwise trusty meter, whenever I try on a Weston Cell it is always the
same voltage registered. But now on the ohms scale will sometimes read
10 or 12 meg with no probes in place. Good battery.
Something to do with the screen shielding? Without any metal covering,
ie the top cover removed and no replacement for the now missing sticky
backed foil over the shielded tinplate box, the meter will not pass
POST, all segments lit on display permanent and no beep on changing
rotary sw setting, normal ?.
So start with cover in place , turn to ohms, and remove cover , it goes
to the floating 10s of megs. Twizzle sticking does not show suspect
switch , preset or anything, and gradually drifts to over-scale, 30M.
Something going leaky with age?
Did you try cleaning the gunk out of the probe sockets?
Probably have to remove the board.

Some meters have a split contact in the socket that sets off an
an alarm if you try to measure volts with the probe in the current
socket. Gotta be some voltage somewhere to sense. Can that
leak thru socket gunk?