YH-305D Power Supply calibration procedure.

[Kaptein QK]

Here is a calibration procedure for the front panel meters:

Potmeters (See picture, the blue ones) left to right:
1- mA range gain.
2- A range gain.
3- mA and A offset.
4- V gain.

Current:
1: Set power supply to mA range.
2: Connect ampere meter.
3: Set current to approx 1mA. (because the front panel meters does not show negative)
4: Adjust current offset potmeter to let front panel show 1mA.
5: Set current to 990mA.
6: Adjust mA range gain potmeter let front panel to show 990mA.
7: Repeat step 3-6 until satisfied.
8: Set power supply to A range.
9: Set current to 4.90A.
10: Adjust A range potmeter let front panel to show 4.90A.

Voltage:
11: Set voltage to 30 V.
12: Adjust voltage gain potmeter to let front panel show 30V.

I could not find anything about calibration of this power supply on the net, so I started fiddling with the pots.

Hope it is useful for someone.

[jimw]

Thanks for posting this!  I did a similar exploration (before I found your post) and had figured out 3 of the 4 pots.  Got voltage and low range current pretty close, but was tired and quit before trying the high range.  Now I know which pot to twiddle when I open it up again. 

I assume your "left to right" meant from looking at the front of the supply.  As pictured from the inside, your numbers 1-4 go from right to left.

Thanks!

Jim

[Kaptein QK]

It is left to right as pictured.