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| Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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Thread Tools |
1st Sep 2022, 4:55 pm
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#1 |
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Pentode
Join Date: Nov 2005
Location: Crewe, Cheshire, UK.
Posts: 138
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AVO EM272 multimeter
Just acquired one of these in working condition except that the meter needle sticks around 40% fsd. It returns following a gentle tap on the casing.
Lots of tips on the forum about what might cause this but before I dive in can anyone advise the correct procedure for dismantling the case/pcb/etc to access the meter movement? TIA Roger G4BZI |
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6th Sep 2022, 4:31 pm
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#2 |
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Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Re: AVO EM272 multimeter
It's been quite a while since I disassembled an EM272.
As I remember it was fairly straight forward and logical. See attached, which are Avo's fairly limited instructions on disassembly. Same procedure for all the 70 Series Multimeters. Ian |
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7th Sep 2022, 7:05 am
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#3 |
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Pentode
Join Date: Nov 2005
Location: Crewe, Cheshire, UK.
Posts: 138
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Re: AVO EM272 multimeter
Ian,
Thanks for this useful info. Disassembly went OK. I found what looked like a rust deposit on the inside of the meter magnet that was obstructing coil movement. Scraped away using the tip of a hypodermic needle and blew out the debris with compressed air. Meter now working fine. Thanks again. Roger |
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