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Jaycar's Analog Lab Bench voltmeter QP5040
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peteb2:
Has anyone some data on the actual movement please, i.e. the FSD current spec and dimensions? I've an upcoming 'mad scientist' style piece of kit to build as a prop that needs to be operational...( joys of back engineering something). Jaycar's online catalog shows virtually no data about the actual meter, not even a set of rough dimensions giving an idea if its a tiny wee thing or what.

Any info appreciated...

Kleinstein:
15 V at 15 K impedance means this is a 1 mA full scale meter. So pretty low impedance.

For the dimensions, the 4 mm terminals should give a hint. So it's quite large. A crude estimate by eye from the picture is some 100 mm square for the movement.
floobydust:
It's oddball because the meter's zero is at 1/4 scale. You might be able to move it back with the zero adj. screw.
sanwai J0408 panel meter and two resistors, inside.
3V FSD the meter coil is 100R and 2k9 resistor, for 3k total and 1mA gives 75% deflection.
15V FSD 100R meter and 12k (between 3V-15V jack) plus the 3V resistor for 15k total.

I can't remember all the DIN 16257 symbols on the panel meter faceplate:
Horseshoe = DC (no rectifier diodes inside)
< = inclined mounting 60 degrees.
star = ? I think it's classroom grade, not measurement grade.
2.5 = accuracy class 2.5% of full-scale
peteb2:
That's fantastic info. Thanks so much. Yes, when i first clapped eyes on it in their online 'emailout' (it's currently at a sale price) i thought perfect...  but then i saw the rather unusual zero=1/4 scale and thought oh dear (but maybe it could still be ok)....

1mA 3/4 deflection & the tilt from vertical... hmmm off to do some thinking.




--- Quote from: floobydust on June 17, 2019, 02:07:51 am ---It's oddball because the meter's zero is at 1/4 scale. You might be able to move it back with the zero adj. screw.
sanwai J0408 panel meter and two resistors, inside.
3V FSD the meter coil is 100R and 2k9 resistor, for 3k total and 1mA gives 75% deflection.
15V FSD 100R meter and 12k (between 3V-15V jack) plus the 3V resistor for 15k total.

I can't remember all the DIN 16257 symbols on the panel meter faceplate:
Horseshoe = DC (no rectifier diodes inside)
< = inclined mounting 60 degrees.
star = ? I think it's classroom grade, not measurement grade.
2.5 = accuracy class 2.5% of full-scale

--- End quote ---
tautech:
Pete, I have 3 similar simple bench moving coil meter here if you want any, they range from 80 to 100mm movements.
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