Blue Jinn
Well-known member
Hi,
Powered up and there is a constant minor deflection (it rests at zero when off, so I don't think it's mechanical):
It otherwise appears to measure a 1kHz sine wave OK, with this constant deflection:
On the 1 volt scale:
Measuring a nominal 9v on the 100v scale, looks to read about that constant deflection higher. Tried this out for a 146v that also reads higher, as if the meter was mechanically set high. But it does rest at zero when off. However, at a lower frequency, (about 100Hz) it flutters high:
This is the .317v signal on the 1v scale.
Here is the schematic:
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxibHVlamlubmF1ZGlvfGd4OjI5YWQzYmRmZjgwYjBjMjk
I read that this could be caused by C32-34 leaking. Any ideas appreciated.
Powered up and there is a constant minor deflection (it rests at zero when off, so I don't think it's mechanical):
It otherwise appears to measure a 1kHz sine wave OK, with this constant deflection:
On the 1 volt scale:
Measuring a nominal 9v on the 100v scale, looks to read about that constant deflection higher. Tried this out for a 146v that also reads higher, as if the meter was mechanically set high. But it does rest at zero when off. However, at a lower frequency, (about 100Hz) it flutters high:
This is the .317v signal on the 1v scale.
Here is the schematic:
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxibHVlamlubmF1ZGlvfGd4OjI5YWQzYmRmZjgwYjBjMjk
I read that this could be caused by C32-34 leaking. Any ideas appreciated.