KYORITSU FET-VOM K-200. How to set BIAS?

[Bo-Lennart]

Hi...
I have an old KYORITSU K-200 FET VOM. I would like to align it the proper way. I have found the DC-cal and AC-cal. And those calibration isn't that hard to understand. But there is a cal called BIAS (VR 4). Is there someone who knows how to set the BIAS. I have set the BIAS-cal in mid position, and the instrument seems to work allright.

Best regards from SWEDEN
Bo-Lennart Karlsson

[Trevor Wilson]

**This might help:

https://elektrotanya.com/kyoritsu_fet-vom_k-200_multimeter.pdf/download.html

I have not tried to download it.

--
Trevor Wilson
www.rageaudio.com.au

[Bo-Lennart]

Hi Trevor....thank's for Your reply. But I have already downloaded that operating manual. But it dosen't say anything about how to align the instrument. What I mean is: At what range should I adjust the DC-cal and AC-cal? And there is a variabel C in the voltage-divider. At what frequency should I adjust that? 1 kHz or 10 kHz???. And finally, how should I adjust the BIAS-cal. I understand that BIAS-cal is for to make the 2 FET more matched.
The instrument works pretty well. The linearity is pretty good. But I would like to see if I can get it better.
Thanks anyway. I keep looking around to see if I can get any adjustment procedure.

// Bo-Lennart Karlsson
Falun, SWEDEN

[Bo-Lennart]

Den onsdag 15 januari 2020 kl. 22:16:54 UTC+1 skrev Bo-Lennart:

I searched a forum, that say that BK Precision had a licens to make a similar instrument like K-200. BK Precision called it "BK Precision Solid State 179 FET-VOM". Is there someone who has a Service Manual including a adjustment procedure?
I would appriciate if You couls share it with me.

Best regards
Bo-Lennart Karlsson
Falun, SWEDEN