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Cossor Model 501



bulletAvometer   Model 7 MK II (1957)
This instrument is one of many manufactured during the 1940's and 1950's by Avo Limited, in Dover, England. This one is from 1957and came with a brown leather case but unfortunately no leads and just one probe. The Avometer was the professional's choice back in those days. The instrument is of superb quality and much of it was hand made. The manufactured date of this AVO meter can be seen from the last 3 or 4 digits of the serial number under the right hand end of the scale. These define the month and year of manufacture. In this case the serial number is No. 73328-A1057. The last four digits 1057 shows that this one was manufactured in October 1957.
 Click on the picture for photogallery
Avo Limited, Dover, England.

Avo was at the time part of the Thorn Group.
AVO Ltd. used to be at Avocet House, 92-96 Vauxhall Bridge Road, London, SW1 and was a member of the Metal Industries Group of companies. Though known for their Avometer general purpose multimeter, they made a wide range of test gear including valve testers. The Acton Lane works closed down at about that time - around 1986. The current range of products can bee seen at: http://www.avointl.com/ The firm now called Megger Ltd is based at: Archcliffe Road, Dover, Kent, CT17 9EN, United Kingdom.

Basic specifications Ranges:
1.0, 10, 100, 400, 1000; DC
10, 100, 400, 1000 ; AC
0.002, 0.01, 0.1, 1.0, 10; DC
0.01, 0.1, 1.0, 10; AC
OHMS: 10k, 100k, 1Meg
Capacitance: 0.05uF to 20 uF(useable range) - requires external supply
Power dB
One 1.5 volt and two Ever Ready 4.5 volt batteries.
Manual pages and circuit diagram Click for Avo 7 manual (pdf format)



Other AVO sites http://www.rrd.demon.nl/avo meetapparaten.htm (In Dutch)
hhttp://www.richardsradios.co.uk/test.html http://www.g1jbg.co.uk/az.htm (various manuals)




  © Copyright 2003 Bob Rathbone. All rights reserved