Hello, I recently purchased a Philips PM 2412A, and it is functioning properly. However, when I set the scale to 1V and give the meter exactly 1V with my lab power supply ( which I check with the fluke 289 which is resent calibrated), it seems to go slightly out of range. How can I calibrate this meter?
Kind regards
Mathis Verschueren
schematic
i think 1st you should measure the trimpots values on each side of the wiper / center pin to be sure
R10 seems for AC
R37 i think is for dc
R27 seems resistance
seems to be 2 - 5 % precision depending of the function, if it's the case i would calibrate it at the center value say 50 ... it is not an precision instrument ...
close values should be enough
in no ways it will compete with more modern equipment
but i see only 2 potetiometers of 1kohm
oh my bad, one must be on the front panel loll
the zero ohms adjustment
pictures would be nice ...