Products > Test Equipment
Siglent SDM3045X mA current measurement - weird behaviour
ahope:
First,
Thanks for the suggestion to vheck volt measurement. I set up a simple voltage divider and verified it with two hand-held DMMs.
The 3045X measured the same values (+/- a few % since it should be way more accurate than the cheap DMMs). The values I tested were 5mV and 0.5mV.
The meter would work normal on both auto-range and manual range. The measurements were made on the 600mV range.
So the voltage side of the 3045X seems to be operating normal and within spec.
Back to the R408. From what I can see it is clearly bulging up. There is no smooth top surface on it, more like it has been "blown" up. Is this normal? You should be able to see it if you study the pictures.
tautech:
Hmmm, yes it looks like that shunt has been hurt. :(
Hunting around I found a couple of images of 3045X and 3055 and enlarged (that didn't work. Grrr) them......attached.
HKJ:
The shunt has been damaged, but if the meter measures correctly it is not that serious yet, but maybe the reading will change with time when air has access to the shunt element.
tautech:
--- Quote from: HKJ on November 10, 2018, 09:00:56 am ---The shunt has been damaged, but if the meter measures correctly it is not that serious yet, but maybe the reading will change with time when air has access to the shunt element.
--- End quote ---
Your one is not trimmed. :o
Thanks for the pic. :-+
HKJ:
--- Quote from: tautech on November 10, 2018, 09:05:25 am ---
Your one is not trimmed. :o
--- End quote ---
I do not believe in laser trimming in this meter, electronic calibration is much easier and cheaper.
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