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Electronics => Repair => Topic started by: Alex06 on November 05, 2019, 08:16:59 pm

Title: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: Alex06 on November 05, 2019, 08:16:59 pm
Hello. This is still a newcomer. I decided to ask you for help, as I myself couldn’t do anything yet.
I have an electronic load Akip-1301A 60V / 30A
 (foreign analog of Prodigit 3320 60V / 30A) copy of 100%.
The malfunction lies in the inaccuracy of the readings that I submit to her voltmeter.
From 0 to 19 V is not resp., But from 20 to 60 V goes.
There are several tuning resistors, but so far they do not help.
On the Internet I was looking for a service manual or circuit, I did not find anything.
Maybe someone will help with the scheme or tell me where to go next.



Title: Re: prodigit 3320 Ремонт. Нужна схема.
Post by: wraper on November 05, 2019, 08:28:27 pm
Пост на всём кроме английского могут удалить, так что советую писать на нём. Тем более что большинство местного народа не будет заморачиваться переводить. И это не копия, а он и есть. Весь акип это тупо смена шильдика.
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: dom0 on November 06, 2019, 09:11:13 pm
The auto-ranging of the meter may be broken.
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: Alex06 on November 07, 2019, 05:55:00 am
One person suggested that it should be calibrated for accuracy. In the service manual it is. But on the Internet, I did not find it.
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: wraper on November 07, 2019, 02:19:28 pm
Quote
From 0 to 19 V is not resp., But from 20 to 60 V goes.
Do you mean up to 19V it does not work at all or you cannot adjust? If inaccuracy, how much. It could be a fault, not calibration problem.
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: Alex06 on November 07, 2019, 04:19:16 pm
measured the reading
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: dom0 on November 07, 2019, 08:24:59 pm
(https://file01.itaiwantrade.com/e535185b-7aa9-47e7-8602-a02a4b41cdec/c56697a2-5da8-4eff-9711-8c929b1bcd87_3320_Specification.jpg)

So it should be accurate to +- 0.05 % + 2 counts, yours is up to 0.2 V out (15 V / 15.2 V), +1.3 % error.

Range switching is indeed done at 20 V. So the lower range needs adjustment, preferably to an reliable, accurate multimeter. Handheld 4 1/2 digit would probably be ok. There is probably one trimmer or 20-turn pot for each range.
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: Alex06 on November 08, 2019, 10:33:58 am
I twisted some resistance, and put in place. They did not help. Only the general adjustment range was found
Title: Re: prodigit 3320.Need repair or calibration. Need a scheme.
Post by: danilnik on February 11, 2022, 06:19:30 am
Hello everyone.  Can I bring this topic up?  Maybe someone got a service manual or calibration method for this device?