This is the bench where the work begins. I disassemble each meter and visually check for burned wires, cold solder connections and missing or damaged components. I also remove the old batteries, put the switch knobs in the ultrasonic cleaner, and clean the rotary switch contacts before proceeding outside where the face, meter and case cleaning begins.
Here, in the foreground, are meters that have been initially inspected and will be completely disassembled in the next step. Yellow "sticky-notes" describe problems or conditions that will be resolved as the process continues.
Each meter is subjected to a 21 step bench test cycle which tests all functions in all ranges against a known source. No meter is sold unless it meets or exceeds the original tolerances.
Here is a photo of the electronics and switch module removed from the case.
Various component modifications required to make the PSM-6 operational with modern batteries are accomplished in this mode. Also, the circuit modifications and adjustments to meet tolerance requirements in the AC tests are performed here as required.
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