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Forum Index : Electronics : Digital Displays

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rustyrod

Senior Member

Joined: 08/11/2014
Location: Australia
Posts: 121
Posted: 03:36am 02 Jun 2015
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Digital meters.

The instructions with MY digital VOLT meters take their power and display reference from a red and black input leads.
BUT BUT, The instructions say the AMP meter needs a separate supply (thin red and black) to light the display and the heavy wires to read the amps.

In one site I found a diagram with a odd battery set-up, on another they had a ?converter? between the power supply and the digital meter. The other diagrams all had a separate battery/power supply.

Now to get more confusing, Then on another site, the shunt was between the battery and the charge and the load, Can these meters be able to show both charge and discharge? How is this indicated?
If say 7.5 was displayed in this circumstance, how is one to know if it is charging or discharging?

I will have to do an experiment with my combi displays, by reversing the wires to the shunt and see if it makes any difference.

Don't go away, I'll duck out into the shed and do a few tests.
I'm back. Man, it's cold out side, almost 11 pm. The weather station mounted 1 meter above the shed roof indicates minus 1.4 c. Grass temp? really cold.

Now,- MY combi meter (0 to 30 volts / 0 to 10 amps) CAN read volts and "discharge" amps from the same battery. That is to wire it - both thin and thick red/black wires paired together and the BLUE (on mine) to the load. ie to a bulb.
It reads the voltage of the “12v” battery and the amps drawn OUT by a load.

BUT, DEFINITELY needs a second battery to try to read in reverse or “charging” and/or if you want to measure over 12v.
So it won't read both ways. The display shows 000 when connected backwards.

To indicate charge the BLUE wire goes to the negative battery terminal and the BLACK wire to the supply/solar/wind genny. The Thick RED wire to positive. That gives volts made and amps made.

The THIN black and THICK black are common.

I am referring to a combination volt/amp display.

We are talking 12 volts here. Any more than 15v to the display and phutt, the lights will go out never to return.

Any more than 30v to measure and ?don't know ? YET!

Thin wires - power to display.
Thick wires – voltage and amp – measure.

Volt Displays up to 30 volt seem to take power and measurement from one pair of wires. (Trust me don't go over the 30 – phutt, done that.)

50/100 volt and above require a separate supply, up to 15 volt to light the display. Other wires to measurement.
Always Thinking
 
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