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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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11th Sep 2019, 12:16 am | #1 |
Retired Dormant Member
Join Date: Sep 2019
Location: Southport, Merseyside, UK.
Posts: 4
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AVO high voltage meter (EX British Rail)
My Late Dad was an employee on British Rail and ended up a senior S and T engineer on the west coast railway working at the Preston power box
He passed away in 2011 and whilst going through the garage found several items One being a BR AVO meter High voltage The glass was dislodged and the cutover red I have figured out the glass and I have the reset switch to repair Just looking for advice on the mechanism |
11th Sep 2019, 7:09 am | #2 |
Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Re: AVO high voltage meter (EX British Rail)
Hi Lee,
Just to start off on the right Track ;-), can you confirm what the Meter is? I am assuming (Which is always a risk!) that it's a Heavy Duty AvoMeter, seeing as it came from BR. Provided it still has its Instruction Plate on the back, the Meter Model will be written at the Top. Is it just that the Reset Button won't stay down? Ian |
12th Sep 2019, 6:35 am | #3 |
Retired Dormant Member
Join Date: Sep 2019
Location: Southport, Merseyside, UK.
Posts: 4
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Re: AVO high voltage meter (EX British Rail)
Ian
The plate has been lost but is a Avo Heavy duty with a single knob in the centre The reset button is a twist to the right to reset the mechanism has an elongated loop with a corresponding second loop and and a pin that fits in the reset mech If I pull on the reset the indicator in the bottom of the display Changes from red to clear So any help would be appreciated As I say my late Dads Also converting his line side lamp to a modern LED |
12th Sep 2019, 9:06 am | #4 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,621
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Re: AVO high voltage meter (EX British Rail)
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12th Sep 2019, 9:31 am | #5 |
Octode
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
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Re: AVO high voltage meter (EX British Rail)
Hi Lee,
If you haven't already got one the instruction manual is here. http://www.richardsradios.co.uk/AVO/HDmk5.pdf John |
12th Sep 2019, 2:58 pm | #6 |
Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Re: AVO high voltage meter (EX British Rail)
Hi Lee,
That would be the correct operation. The Red indicates the Cut Out has been tripped. When you turn the Reset Knob and the indicator goes to Clear, and it should remain in that position, it means the Meter should be good to go. If the Cut Out isn't resetting, i.e. the Red indicator pings back, then you will need to take out the Meter Movement to gain access to the Cut Out Mechanism. Unless there is a good reason to remove the Movement though, I would leave it alone. If there is a problem with the functionality of the Meter, let us have the details and we can work through it. Ian |
13th Sep 2019, 7:05 am | #7 |
Retired Dormant Member
Join Date: Sep 2019
Location: Southport, Merseyside, UK.
Posts: 4
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Re: AVO high voltage meter (EX British Rail)
I have managed with a very old diagram worked out the mechanism
The only item is the spring and how to position Surprising the help As for the lamp yes a Bardic and also a yellow lamp called a Hitech The manafactuer has just been put in admin But I think have converted also to hi output led with 18650 batteries on 6000 output so to date looking ok |