Analog voltmeter does not go back to zero

R

remzo

New Member
Hi all,

I wanted to use the output of a DAC pin of the ESP 32 to control a voltmeter and use it as a display.

This almost seemed to work but suddenly the volt meter has chosen a new 'zero' at .5 volt.

The ESP32 sends out different voltages and the meter responds. But not so accurate since .5 is the new zero.

Can I somehow reset this meter?
 

Attachments

  • Screenshot 2024-07-20 172050.png
    491.4 KB · Views: 299
Last edited:
Solution
The mechanical "zero adjustment" mechanism has been disturbed, I guess by your fingers when you picked up the meter.




Try moving the the part indicated by the red arrow.
When that part is vertical, the meter pointer should be at zero.

JimB
Sort by date Sort by votes
Does the meter not go back to zero when the DAC signal is physically removed?
 
Upvote 0 Downvote
As crutschow's question is "Does the meter NOT go back to zero" when the meter is disconnected from the DAC do you mean that it does NOT go back to zero ?

Les.
 
Upvote 0 Downvote
It does not go back to zero indeed. In the photo the volt meter is disconnected.

If I switch + and - the DAC signal makes the meter go to zero (and it tries to go even lower).
 
Upvote 0 Downvote
The mechanical "zero adjustment" mechanism has been disturbed, I guess by your fingers when you picked up the meter.




Try moving the the part indicated by the red arrow.
When that part is vertical, the meter pointer should be at zero.

JimB
 
Upvote 1 Downvote
Solution
I was just about to say what JimB said, and Nigel was about to say.

I think some engineers of a certain age have experience of analogue meters.
 
Upvote 0 Downvote
Thanks JimB, Nigel and Diver300, it was exactly that unnamed thingy. The adjusting screw corrects a little bit but not so much.

I've another voltmeter with the same problem and will take a look at that one too.
 
Upvote 0 Downvote
I think that some dirt has got in between the coil and the magnet. Just moving the zero adjustment by accedent should give readings that were consistently out by the zero offset error.

Les.
 
Upvote 0 Downvote
I wonder if a large negative voltage or an impact stretched the spring.
 
Last edited:
Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

R
  • Question Question
(Another) analogue voltmeter does not go back to zero
Replies
13
Views
4K
schmitt trigger
S
Y
  • Question Question
analog connection for converting single ended to differential
Replies
5
Views
2K
danadak
F
Simple LED Analog Clock Idea
2
Replies
20
Views
3K
For The Popcorn
F
Y
  • Question Question
analog feedback temprature regulator question
Replies
13
Views
4K
ahsrabrifat
A
Y
  • Question Question
shape logic of analog differeratiator and integrator
Replies
6
Views
2K
Tony Stewart
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…