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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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18th Jan 2011, 10:05 am | #1 |
Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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GPO Multimeter: Info Sought
Anyone wish to comment on this little multimeter I've been given, other than its external dimensions are 5¾" x 3¾" x 1¾"?
It appears to be accurate (specification unknown) on all ranges compared to a Fluke DMM. Who made it? Taylor? AVO? Other...?
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Regds, Russell W. B. G4YLI. |
18th Jan 2011, 10:19 am | #2 |
Heptode
Join Date: Mar 2009
Location: Portsmouth, Hampshire, UK.
Posts: 674
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Re: GPO Multimeter: Info Sought
Looks very similar to a Taylor 127A.
First thing to do is to make a blanking plug for the 'S' socket, this connects directly to the meter movement (for connecting an external shunt). It's is all too easy to connect to this rather than the '+' socket and the result is catastrophic. Jim |
18th Jan 2011, 11:28 am | #3 |
Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
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Re: GPO Multimeter: Info Sought
Jim: thanks for that - will do!
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Regds, Russell W. B. G4YLI. |
18th Jan 2011, 1:59 pm | #4 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: GPO Multimeter: Info Sought
It does, doesn't it. Looks like the GPO specified simpler scaling, though.
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18th Jan 2011, 3:05 pm | #5 |
Octode
Join Date: Oct 2008
Location: Littlehampton, West Sussex, UK.
Posts: 1,465
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Re: GPO Multimeter: Info Sought
It is a Taylor 127A badged by the PO.
As an ex Xerox engineer I used one a lot in the 1960s and found it to be a reliable meter that stood many shocks and bumps and survived being dropped on the floor many times when I opened the lid of a copier when it fell off. There have been a few PO ones at rallies over the years. Quite easy to repair too when you stick the mains across the ohms range as I did a few times. I had several at one time and took the movement out of one to fit into an Avo Mk3 valvetester. It wasn't quite sensitive enough even though it fitted. Maybe the op amp mod would have helped. Jim |
18th Jan 2011, 4:37 pm | #6 |
Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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Re: GPO Multimeter: Info Sought
Chaps: many thanks for the replies. Now I know!
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Regds, Russell W. B. G4YLI. |
7th Nov 2012, 7:38 pm | #7 |
Retired Dormant Member
Join Date: Sep 2012
Location: Winchester, UK
Posts: 36
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Re: GPO Multimeter: Info Sought
Yup, I scored one of these 127A's at a boot sale to day... the Guy wanted £4 but I convinced him it was only worth £3. Smart little analogue meter... even got the leather case with it
It looks pretty clean and appears to work on all volt, current and ohm's ranges... have not tried the resistance ranges yet as no batterys installed. I did notice I have a broken resistor coming off the wafer sw. So will have to find a schematic to see what the value is. I beleive Taylor was part of the AVO group or vise versa? I just love boot sales... never know what you are going to find; like a bag of Mazda/Mullard valves that I also scored today... I will be checking those out on the valve tester later. DaveH - G4NWP |
7th Nov 2012, 7:51 pm | #8 |
Retired Dormant Member
Join Date: Sep 2012
Location: Winchester, UK
Posts: 36
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Re: GPO Multimeter: Info Sought
Did anyone find a manual for these litlle Taylor 127A meters?
DaveH |
7th Nov 2012, 8:06 pm | #9 | |
Heptode
Join Date: Mar 2009
Location: Portsmouth, Hampshire, UK.
Posts: 674
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Re: GPO Multimeter: Info Sought
Quote:
Jim |
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7th Nov 2012, 8:21 pm | #10 |
Retired Dormant Member
Join Date: Sep 2012
Location: Winchester, UK
Posts: 36
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Re: GPO Multimeter: Info Sought
Aghhh, thanks Jim, just downloaded those files It shows the resistor values coming off the wafer switch... so I can get my soldering iron in there and replace a broken resistor.
DaveH - G4NWP |
7th Nov 2012, 8:40 pm | #11 |
Pentode
Join Date: May 2011
Location: Enniskillen, Fermanagh, UK.
Posts: 188
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Re: GPO Multimeter: Info Sought
We used to know these meters as a "Meter Multi-Range 12 A", and yes, very handy. Later we got the 12 C. The bigger AVO shape, was a "M'M'R 14 C". Cliff.
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