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  #1  
Old 08-16-2013
konehd konehd is offline
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Default AC Volt Meter Adj?

On my '93 WB the volt meters over the dash are incorrect. See the photo...

Checking the terminals on the back of the meters I see 125vac with my fluke meter, as you can see one reads about 110 and one reads about 130.

Is there an adjustment for these? I dont see one on the face or the back of the meter, and before I start taking them apart I thought Id check here ;}



Thanks, Joe
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Old 08-16-2013
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warbucks13477 warbucks13477 is offline
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I have never seen one. the voltage on the meter is measured across a calibibrated shunt of known resistance. and the current thru the shunt reads as voltage drop across the shunt. tjere are of course two shumts one for each leg of the power. are you sure your Fluke is correct? check the Current thru the shunts and that will give you a better idea.
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Old 08-16-2013
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If you get correct readings at shunts disconnect wires at meters. Check voltage reading. Next flip flop wires on meters to determine if meters are OK. Easy test with alligator clip wires.
Note - there is no charge for this information as it isn't worth anything.
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Old 08-16-2013
konehd konehd is offline
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Quote:
Originally Posted by warbucks13477 View Post
I have never seen one. the voltage on the meter is measured across a calibibrated shunt of known resistance. and the current thru the shunt reads as voltage drop across the shunt. tjere are of course two shumts one for each leg of the power. are you sure your Fluke is correct? check the Current thru the shunts and that will give you a better idea.

Hi Tom,

Id trust the fluke over these meters any day... Every time Ive had them calibrated they are right on.

As I said, Im reading right on the terminals of those meters.
AFAIK there are no shunts on volt meters, maybe your thinking of amp meters?


/Joe
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Old 08-16-2013
konehd konehd is offline
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Quote:
Originally Posted by KCSS View Post
If you get correct readings at shunts disconnect wires at meters. Check voltage reading. Next flip flop wires on meters to determine if meters are OK. Easy test with alligator clip wires.
Note - there is no charge for this information as it isn't worth anything.

Thats a good idea... Trouble is I know the meter readings are wrong, both of them!
If there is no external adjustment then I'll look inside...

/Joe
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Old 08-16-2013
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Do they sit on Zero correctly?
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  #7  
Old 08-16-2013
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Volt meter gauges will normally not have any way to adjust them. If you have verified the voltage with a Fluke meter, I would trust it over a $15 panel meter.
Volt meters do not use a shunt as this is for the ammeter gauges.
Easy enough to change them out, but ensure the power is completely off before working on them.
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  #8  
Old 08-16-2013
konehd konehd is offline
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OK,

Heres the scoop on the meters...

Ive always seen a way to adjust even cheap meters, usually its on the front and there is a lever mechanism to move the pointer. You may be only able to get a correct reading at one point in the scale. You older guys (isnt that everyone here?) may remember mirrored scales so you could eliminate parallax when reading meters...??

I took the meter out and examined it. Looks like there is no way to take the meter movement out of the case, at least I didnt want to break it to find out.

By loosening the nuts at the back side I was able to look through the hole where the light goes and see an adjustment screw, but no way to get to it with out taking the meter apart ;{

Someone else might want to force the meter apart and see if it opens up easy. I decide to drill a hole to access the adjustment.

Pretty easy, its plastic, just go slow...

After drilling the hole it adjusted easy! After installing it I put a piece of tape over the hole to keep dust out.

Done!! Now it reads correctly ;}

The photos show all... If your meter is off and you decide to do this be careful! Turn the power off and drill slowly ;}


HTH, Joe
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  #9  
Old 08-16-2013
ejallison1 ejallison1 is offline
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Cool beans-thanks Joe
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  #10  
Old 08-17-2013
schipperkejoe schipperkejoe is offline
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Thanks for the information. I've had two different voltage readings and fixing the problem is getting closer to the top of the list. Now I know what to do.

First item now is a fuel problem that shuts off the gen-set. After that, there is no closure for the dryer vent and it sucks road dust into the dryer while we're driving.

They both sound like more trouble than fixing the volt meters, might re-arrange the list. Thanks again. joe
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