EEVblog

EEVblog 1663 – BM786 Multimeter REPAIR + InEr Error Investigation


Listen Later

Repairing a customers Brymen BM786 multimeter, and investigating the cause of the InEr error message on the input jack alert feature.

Plus a giveaway to a local youngster.

00:00 – A returned BM786 Multimeter with InEr error message

03:23 – Split jacks and input alert circuit
05:19 – In-Circuit probing TIP and Low Ohms mode.
07:19 – A clue?
08:05 – A need a new desoldering gun. Removing the input jacks
10:30 – Bodge testing of the input detection threshold
12:38 – Not one but TWO failed Megger Insulation meters!
13:50 – Megger testing the connectors at 500V
15:19 – Testing a 2nd failed InEr error meter
17:00 – Cleaning the input jacks
19:11 – Heating up the input jacks
20:18 – Getting desperate, removing the input jacks
21:49 – Getting really desparate, removing the input resistors
22:38 – Reassembling the original repaired unit
24:26 – Repaired BM786 GIVEAWAY

Keysight OLED meter repair: https://www.youtube.com/watch?v=CKdeqqo2diI

Forum: https://www.eevblog.com/forum/blog/eevblog-1663-bm786-multimeter-repair-iner-error-investigation/

...more
View all episodesView all episodes
Download on the App Store

EEVblogBy David L. Jones

  • 4.6
  • 4.6
  • 4.6
  • 4.6
  • 4.6

4.6

79 ratings


More shows like EEVblog

View all
This American Life by This American Life

This American Life

90,931 Listeners

The Amp Hour Electronics Podcast by The Amp Hour (Chris Gammell and David L Jones)

The Amp Hour Electronics Podcast

231 Listeners

Embedded by Logical Elegance

Embedded

190 Listeners

The Rest Is History by Goalhanger

The Rest Is History

15,258 Listeners

Battle Lines by The Telegraph

Battle Lines

186 Listeners