Products > Test Equipment
KORAD 3005P, calibration?
Electro Fan:
On my Korad KA3005P when I set the PS to 9V, 20mA my Fluke 179 says 8.99V, 20mA with the output button on.
With the PS still set to 9V, 20mA and the output button is off the Fluke says -112mV, -0.11mA.
With the PS set to either 9V or 5V and 5ma and the output turned on I get 5.7mA on the Fluke.
I found a newer version of the calibration routine (attached below) - probably worth giving it a try.
EDIT: after warming up the 5.7mA reading became ~5.4mA.
MikeK:
They appear to be saying that you shouldn't expect better than 5mV and 1mA even when switched off.
Electro Fan:
--- Quote from: MikeK on May 13, 2022, 07:11:44 pm ---They appear to be saying that you shouldn't expect better than 5mV and 1mA even when switched off.
--- End quote ---
I have two Korad KA3005 units (one P and one D). Having gone through TEA, in addition to the two Korads, I've collected my share of meters (179, Brymen 789, KS 34465A, and more than several others). After doing plenty of measuring I think the Korad at just a little over $100 more than holds it's own. Try the calibration routine - it's a little bit hard to interpret but stick with it and I think you might be able to dial-in the Korad to an extent that will give you good confidence. Having said that, anything can fail and it's possible your unit has some issue but I wouldn't draw that conclusion until trying to calibrate it.
MikeK:
I tried the cal...that's the best I can get. I'll live with it. I might build Scullcom's millivolt meter for what I'm doing.
Thank you.
ivo:
This worked to at least remove the horrible 5mA offset I had in my Tenma 3005P equivalent. You can use the left/right button to change the granularity of the adjustment, by changing which "digit" you are adjusting (even though they tend to all still indicate 0). The values I saw from the adjustment were quite unintuitive but from experimentation it seems to have improved it, at least, much better than you can by only adjusting the MSD. Very low mA measurement by the PSU is now usually less than a mA out. Unfortunately the voltage seems somewhat doomed in my unit by the DAC's INL. The low ranges (say <=5V) are a constant mV low, but higher (>=10V, where 30 is its full scale) are near bang on. Adjusting the 5A full scale is a bit tricky while my best A-range meter was constantly heating up it's shunt trying to measure :-DMM
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