22-12-2011, 06:34 PM
(22-12-2011, 05:57 PM)Skywave Wrote: :idea: Since the error appears on both the V and I ranges, it makes me wonder if there is a 'swamping' resistor - which may be fitted inside the meter housing itself - that has gone HR.
You also refer to oxidised switch contacts. Since this meter monitors V & I, presumably there is a switch for this: dirty contacts?
Al.
Al,
I am referring to the meter which in circuit is always measuring current, there are no swamping resistors, there is a mutiway swtch with appropriate series resistors in place . The external multiway switch I have cleaned and have checked correct reading by removing the faulty meter and substituting my dvm on low current range. The readings on the dvm are exactly as they should be so it is a meter movement problem.I suspect it is either a patially shorted coil or the torsional springs. After dinner I am going to have a good luck under a strong light and magnifying glass.
I do not hold out much hope on this one
Mike
