I have a SP 142 Sperry analog vom from the 70’s that for some reason now only reads half voltage on AC. 240 vac now reads 120 on all ac settings.
I don’t have a schematic for it but I did notice unlike my analog Simpson Vom with Germanium diodes the Sperry has two zener diodes. The zener diodes are good.
Any ideas what would cause this old analog meter to suddenly read half AC voltage?
I don’t have a schematic for it but I did notice unlike my analog Simpson Vom with Germanium diodes the Sperry has two zener diodes. The zener diodes are good.
Any ideas what would cause this old analog meter to suddenly read half AC voltage?