Is there some benefit to have it range down at a different value than range up value? e.g. 1900 vs 2200, 5800 vs 6200
When you are testing from zero going up in range, you still get the full 6000 count but when going down, you only get 2000 count.
example: when reading a changing voltage (charging cap etc) it counts from 1.000 to 2.000 .... 5.000 - 6.000 then 07.00 - 08.00 but when going down, it had to go 08.00 - 07.00 .... 04.00 - 03.00 - 02.00 then 1.000. I hope you get what I mean.
Update with mains voltage.
Again, values on the left were fluctuating because of unstable mains voltage.
The measurements on the right were from a crappy UPS with a modified 'sine'wave.
Virtually spot on with the Brymen.
I don't see a problem with the 8000 counts.
If it does have a problem with higher voltages like 400V and above I wouldn't mind
because I am not using anything close to that.
I only need to fix the down ranging.
Update with mains voltage.
Again, values on the left were fluctuating because of unstable mains voltage.
The measurements on the right were from a crappy UPS with a modified 'sine'wave.
Virtually spot on with the Brymen.
I don't see a problem with the 8000 counts.
If it does have a problem with higher voltages like 400V and above I wouldn't mind
because I am not using anything close to that.
I only need to fix the down ranging.
It may be fine with sine waves, try higher crest factor waveforms.
Re. down ranging - have you tried what I suggested? It worked for me.
400Hz and how many volts?
I've tested the previous 22.6VAC waveform up to 2Khz with similar results.
So, did you check the down ranging? Does it stay at 8000 counts when the voltage starts decreasing?
That was the highest I could go with such a high crest factor waveform.
22.6V was the peak to peak value of the waveform, not the RMS which was 2.4V.
I can raise the RMS voltage but then the crest factor will decrease which was the
point in the first place.
I might give it another try to see if I can get a crest factor of 3 and RMS of around 8V.
Just tried to do it but I got strange behavior in the mV range from the UT210E and the Brymens.
The waveform was just a pure sinewave at 60hz.
The reference multimeter that was agreeing with the oscilloscope was the UT136C...
Probably because of its mV auto ranging. But have a look at the other multimeters.
(sorry for the bad image quality)
[...]
The UT61E was the most well behaved which is to show that its still one of the best
low budget multimeters for low voltage electronics. That accuracy drift though...
The thing to note was that the Brymens displayed false readings without any warning.
* FAIL * for the expensive Brymens...
Do the Brymens only behave wrong like that in AC Mode?
Wow big fail for the brymens, to high input capacitance??
VB is the bias current input in IC. The increase off R1 reduce the current in IC,
but the shortage of bias current will affect the input range of AC measurement.
QuoteDo the Brymens only behave wrong like that in AC Mode?Yes, only in mVAC mode.
I don't know if a fix is possible.
I tried to contact them for schematics and they did not even reply...