Multimeter Calibration?
What is the best way to check your voltmeter? Some years ago I ran into the problem where the meter read voltages too high when its battery was low. That took a while to discover since it happened...
Forum Discussion
Thanks, that video was helpful, showing what to expect at various voltages. I checked the new meter against some small batteries, and it comes out fairly well I think.
A 9v batt reads 9.17 and four 1.5s in series reads 6.22 where the batteries are all showing "good" with my battery tester. (Also not calibrated)
My other RV meters are to one decimal place and say 13.8v, while the new meter says 13.84. I don't know when those other meters roll up to 13.9 passing through 13.85.
It seems the new meter might be reading a teeny bit high, but it is accurate enough for anything I use it for, based on all that. The old one said 13.56 instead of 13.8 on the Trimetric.
The part I don't like is how these meters go off calibration slowly so you don't notice it. You can think you have voltage drop when you don't for instance, or not as much as it appears.
You can adjust the voltage reading on the Trimetric in P18 to match what your meter says, but first you need to know if the meter is right. :(
Have to do a meter check on a regular schedule from now on. Lesson learned.
A 9v batt reads 9.17 and four 1.5s in series reads 6.22 where the batteries are all showing "good" with my battery tester. (Also not calibrated)
My other RV meters are to one decimal place and say 13.8v, while the new meter says 13.84. I don't know when those other meters roll up to 13.9 passing through 13.85.
It seems the new meter might be reading a teeny bit high, but it is accurate enough for anything I use it for, based on all that. The old one said 13.56 instead of 13.8 on the Trimetric.
The part I don't like is how these meters go off calibration slowly so you don't notice it. You can think you have voltage drop when you don't for instance, or not as much as it appears.
You can adjust the voltage reading on the Trimetric in P18 to match what your meter says, but first you need to know if the meter is right. :(
Have to do a meter check on a regular schedule from now on. Lesson learned.
