AMPROBE AM-90 - Page 1
Forum section: electronics / repair

author: kardacz
author_rank: Contributor
timestamp: July 02, 2016, 02:01:40 pm
content: Hello everyone! I research the scheme of the multimeter AMPROBE AM-90, because mine is broken .... Someone could you do it to me pictures of the measuring board (the one that presents the input terminals of the multimeter)?Merçi much for your help for my payday !!

author: retiredcaps
author_rank: Super Contributor
timestamp: July 02, 2016, 05:06:45 pm
content: If your Amprobe AM-90 looks like this picture, it is a Brymen meter. AFAIK, Brymen has never released any of their schematics.What is broken with yours?1) Does it power on?2) Does measuring a 9V battery work?3) Does measuring a 1k ohm resistor work?

author: nanofrog
author_rank: Super Contributor
timestamp: July 02, 2016, 05:23:37 pm
content: I can check values in my Brymen BM-857a as needed if need be.

author: kardacz
author_rank: Contributor
timestamp: July 04, 2016, 11:00:26 am
content: Hello; the multimeter turns on but does not work in ohms and devotees ..... Someone could he faires you me pictures of this model (even equivalent)(Measuring card + wheels)

author: retiredcaps
author_rank: Super Contributor
timestamp: July 04, 2016, 12:11:49 pm
content: Quote from: kardacz on July 04, 2016, 11:00:26 amHow about more detail wrt to the comment "does not work in ohms" ?4) With probes unplugged, what does the meter show in the ohms setting?5) With probes shorted, what does the meter show in the ohms setting?6) With probes measuring a 1k ohm resistor, what does the meter show in the ohms setting?

author: kardacz
author_rank: Contributor
timestamp: July 05, 2016, 10:45:32 am
content: Hello; ohms as in volts; the measure is not connected Probes or not (the multimeter seeks the scale, sometimes the message "OL" appears).

author: retiredcaps
author_rank: Super Contributor
timestamp: July 05, 2016, 02:43:45 pm
content: Quote from: kardacz on July 05, 2016, 10:45:32 amI realize there is language differences and remote troubleshooting is difficult, but I have read the above 5 or 6 times and I still don't know what you are saying.Try posting pictures to my questions 4, 5 and 6. If you can't do that, then I'm afraid I can't help. I try to ask simple easy questions so that google translate works. Please try to answer the same way.

author: kardacz
author_rank: Contributor
timestamp: July 07, 2016, 10:43:53 am
content: Hello; I'm in France and uses google translation to translate all I have to say in English ... Does someone could make me photos of contact 2 switches (multimeter disassembled)Thank you in advance for your help!!!

author: nanofrog
author_rank: Super Contributor
timestamp: July 07, 2016, 07:43:38 pm
content: Quote from: kardacz on July 07, 2016, 10:43:53 amInternal photos of BM859a & BM857a(scroll down for the internal photos I posted of the BM857a).

author: kardacz
author_rank: Contributor
timestamp: July 14, 2016, 08:17:40 am
content: Hello; resolved breakdown !! Thank you for the photos!

author: nanofrog
author_rank: Super Contributor
timestamp: July 14, 2016, 10:30:43 pm
content: Quote from: kardacz on July 14, 2016, 08:17:40 amYou're welcome.Glad you were able to fix it.