|
Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
|
Thread Tools |
25th Mar 2020, 6:52 pm | #1 |
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Avometer model 40
Hi I was out for my once a day exercise and came across a avometer model 40 I dont no anything about these I checked the batteries and changed the 1.5 aa then checked the voltage of a battery and a resistor on the meter seemed to work
I know nothing about them or how to use one. Would anyone have a manual for it so I can find out more and learn how to use it properly and find out about the q Mark |
25th Mar 2020, 7:13 pm | #2 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,108
|
Re: Avometer model 40
You may find images if you search on here; many of the manuals have been scanned on by forum users.
If not send me a private message and i will email images to you at the weekend. The critical thing is to pay full attention when using the meter as (despite the cut-out) they are vulnerable to overload, reverse polarity mistakes, and impact. The voltage ranges on a Model 40 are less than ideal by the standards of today, but they can be surprisingly accurate. Dave |
25th Mar 2020, 7:42 pm | #3 |
Octode
Join Date: Jan 2007
Location: Dorridge, West Midlands, UK.
Posts: 1,486
|
Re: Avometer model 40
Useful info here http://www.richardsradios.co.uk/avo40.html and here https://www.vintage-radio.net/forum/...ead.php?t=2804
and use the instructions for a Model 7 which will be a good guide.
__________________
Chris Wood BVWS Member |
25th Mar 2020, 9:13 pm | #4 |
Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
|
Re: Avometer model 40
Hi,
Model 40 Mk II working instructions attached. Operation would be pretty much the same for the Mk I. Ian |
25th Mar 2020, 10:48 pm | #5 |
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Avometer model 40
Thanks for that Ian I will print it and have a good read
|
26th Mar 2020, 12:04 am | #6 |
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Avometer model 40
Reading the manual And what buttons do.
The ÷2 button doesn't move, should it be like a button or would it be stuck Mark |
26th Mar 2020, 12:54 am | #7 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,108
|
Re: Avometer model 40
It's mildly spring loaded so, yes, it should move in for low V/A ranges and spring back out for high V/A ranges. (ie it doesn't rotate)
|
26th Mar 2020, 3:59 pm | #8 |
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Avometer model 40
Ok so maybe mines stuck in then thank
|
26th Mar 2020, 6:28 pm | #9 |
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Avometer model 40
I have now had a better look at it I have taken it apart to see if I could ease the ÷ button in and out to see if it would work the date inside says 1969 so I would presume that that was its last calibration there is a date for 68 as well. After taking it from its case I noticed that the P adjuster has a crack so when you turn it the brass bit doesn't stay straight that explains why at different point it would shoot to 0 still it was free maybe in the future I will look for another one
Thanks for the help Mark |
26th Mar 2020, 11:26 pm | #10 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,108
|
Re: Avometer model 40
A very small amount of 3 in 1 can ease the button where bakelite rubs against bakelite. It's feasible that a piece of grit might have jammed it, it is inaccessible from behind until the meter movement is removed- (a search on the forum will produce precautions/instructions for this.)
|