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Post by tim1750 on Apr 24, 2019 14:14:31 GMT
 Hi All I have a problem with a meter I just bought I checked a battery with my multimeter and it read 12.5vdc when I checked it with the new meter it was off the scale did I buy a bad meter or the wrong type ?. Thank you in advace Tim link |
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Post by MartinT on Apr 24, 2019 14:20:37 GMT
Hi Tim
That's an extremely odd analogue meter. I'm not sure I've seen such a scale. The scale says Volts DC but it also confusingly says 'db' above it. Could it be set to the wrong scale?
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Post by tim1750 on Apr 24, 2019 14:44:11 GMT
Could be Martin it has a light and a pot beneath it but their not wired in so it's beyond me
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Post by Slinger on Apr 24, 2019 14:48:42 GMT
It's a bit odd. I would have expected the Volts D.C. scale to be linear and the db scale to be logarithmic.
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Post by MartinT on Apr 24, 2019 16:24:20 GMT
Me too, but if 'db' is really decibels, relative to what?
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Post by Firebottle on Apr 25, 2019 6:40:04 GMT
I guess the primary function was as a dB meter, reading the output of a logarithmic amplifier.
The voltage check would need a series resistor to read correctly.
The small text at the bottom of the meter face is obscured in the photograph, what does it say?
Try connecting via a resistor of (say) 33K or 68K and see what it reads.
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Post by tim1750 on Apr 25, 2019 6:51:30 GMT
Sorry Firebottle i'm not good with electronics
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