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Pioneer SX1500 TD center tuning meter
- Thread starter Grbluen
- Start date
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You could check the "new" meter with an ohmeter. Most ohmeters will pass more current than the tuning meter is meant to handle, so what you might do is put yourself in the circuit to limit the current. That is, connect one ohmeter probe to the tuning meter, touch the other ohmeter probe with your hand, and touch the other tuning meter terminal with your other hand. The tuning meter should deflect slightly in one direction or the other. Then reverse the ohmeter probes to check the other direction.
If everything else is in good shape, no adjustments should be needed.
chazix
If everything else is in good shape, no adjustments should be needed.
chazix
It's a rather picky issue, but I believe using most ohmeters directly on the terminals of meters like this will grossly overdrive them.
A center tuining meter is typically 50-0-50 microamps. An ohmeter on a low ohms range probably pushes at least one milliamp into a short circuit - possibly much more.
Is overdriving harmful? Not very likely. But pegging an analog meters isn't going to do it any good, either. Mostly, I just don't like the idea, thus my suggestion about limiting current.
Cheers,
chazix
A center tuining meter is typically 50-0-50 microamps. An ohmeter on a low ohms range probably pushes at least one milliamp into a short circuit - possibly much more.
Is overdriving harmful? Not very likely. But pegging an analog meters isn't going to do it any good, either. Mostly, I just don't like the idea, thus my suggestion about limiting current.
Cheers,
chazix
jdurbin1
Tandberg enthusiast
Hence my comment about applying the test signal quickly, not leaving them connected for a long time. Tap it and watch the needle, it'll tell you a lot about the meter movement watching it jump to full deflection and back to center.
I am sure you COULD damage a meter, but after years of doing that I have yet to do so. It does however do an awesome job of identifying meters that are prone to getting stuck at higher deflection, which a less dynamic signal does not always tell you. Tandberg VU meters are an example of that.
Having said that, you can also just use a variable DC power supply and start from zero, and throw a high value resistor in series to current-limit that source.
John
I am sure you COULD damage a meter, but after years of doing that I have yet to do so. It does however do an awesome job of identifying meters that are prone to getting stuck at higher deflection, which a less dynamic signal does not always tell you. Tandberg VU meters are an example of that.
Having said that, you can also just use a variable DC power supply and start from zero, and throw a high value resistor in series to current-limit that source.
John