Analog Meters
Channel: Keri Szafir
Date: 2022-05-21

Showing you some analog multimeters and voltmeters from my collection. An occassional tech tip here and there too.

The usual greeting got cut off at the recording phase (I probably started talking while still on the shutter release timer). Don't worry though - I got down to editing those intros, and this video is the first one to feature it.

0:00 Intro
0:38 Meter #1: ERA UM-3a multimeter
1:50 UM-3a disassembly
4:05 Panel uncovering
4:35 Taking it apart further
5:41 The culprit (and story time)
6:30 Electrical vs electronic
8:00 Mechanical fixes and touchups
8:15 Reassembly
9:15 AC wattmeters digression
10:45 Hex? Allen? Imbus?
12:06 Meter #2: German antique 15/30VDC voltmeter
12:48 The problem
13:03 Serial resistor shenanigans
15:22 Schematic
16:10 Restoration
17:28 Remember about your fume extractor!
18:51 Reassembly
19:40 Mr Rattmann
20:17 Testing
23:05 Back to UM-3a: Ohmmeter
26:09 Analog ohmmeter limitations
26:28 Wheatstone bridge
27:58 Positive and negative
28:10 Meter #3 cameo appearance: Meratronik V640
29:10 Antique 6F22 battery!
30:36 Meter ranges and value calculation

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