Model Boat Mayhem
Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: RAAArtyGunner on May 02, 2016, 07:43:55 am
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Have been given a total of six, of these little blue digital volt meters.
Looking at them they appear to be identical except for the wiring.
Three have two wires, Black & Red. No problem hooking these up, Black -, Red +.
The other three have a extra white wire, just like you see on a servo.
My question is don't know where to connect the white wire?????
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Hi, if it's the same as a friend's unit, black to neg, red to POS, white to the POS. The third wire connects to the source to be measured, the red and white power the unit. You can use this to measure a battery other than the battery it's connected to by having a common ground and connecting the white to the POS of the other battery.
In normal use just join the red and white together.
Chas
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Guessing here.
The digital display and the circuit driving it will need some sort of power if the device does not include a battery. So red and black provide the display power. If only the red and black are connected, it might show the voltage thus connected for a given range, or not. The third connection marked VT (voltage, test??) might be where the voltage to be measured is fed in.
Just what voltage they are intended to run on is anybody's guess, as is the voltage range that they are intended to measure.
Chas posted while I was checking my spelling - it would be good to know the range of voltages it is intended to work on.
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My mates unit measured 0 to 20 volts plus, we never went higher. Supply voltage min was 5 volts, the max supply we used was 18 volts nominal. ( 3 x s.l.a 6 volt batteries)
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Many thanks for the replies. :-)) :-))
Joined Red and White and works OK.
Am only going to use them for boating to keep track of the batteries, so largest voltage would be 12Volts.
:-)) :-)) :-))