Military Testmeters types C D E F and H

In appearance these are very similar to the commercial range of AVOmeters.
The following information has been taken from AP 10955H Vol1 Section2 Nov1943

"Testrneters, types C, D, E, F, and H are self»contained instruments, providing the means ofmeasuring wide ranges of voltage, current, and resistance values, and although light and easily portable they are reliable and robust. The instruments are dust and weatherproof and are suitable for both temperate and tropical climates. They are housed in suitable weatherproof cases and the ranges covered are controlled by switches and/or sockets mounted on the front of the instrument. A scale, protected with glass, and appropriately marked, is mounted on the front of the case, and these, together with the necessary terminals, comprise the complete testrneter control equipment. All screws and detachable parts are secured against looseness due to vibration."

It seems that by the time of this publication the services had accepted the Automatic Coil Winder Company designs as the standard as pictures of the instruments accompany the descriptions in the above specification.

Type C With leads and Case  10S/78 Similar to UNIVERSAL AVOMINOR but DC ONLY

Type D with leads.  10S/10610 essentially the same as AVO MODEL40 (Though also made by other manufacturers)

Type D connecting leads NO.4  10S/10612

Type D ` Battery  5]/2000

Type 15 Fuse Testmeter, type D 10S/10611 (for early models only)

Type E connecting leads No.5 10S/10616 essentially the same as DC AVOMINOR

Type E with leads and Case  10S/10613

Type E Leather carrying case  IOS/10614

Type E Battery  5]/1723

Type 16 Fuse testmeter, type E  10S/10615

Type F with leads  10S/1 also 5QP/1 essentially the same as AVO MODEL 7 MK1 and Mk2

Type H  With leads and case  10S/46 also AD PATT 13301 essentially the same as UNIVERSAL AVOMINOR

Some of these instruments and their accesoriesof tmay have a stores reference starting with10A/ rather than 10S/

I have seen a UNIVERSAL AVOMINOR in a leather case marked ZD00116 which would indicate that this instrument was supplied to the War Office or MOD.

AP1186E  Volume 1 section 9 covers the same instuments but also includes two variants of the model D meter made by SEI (Salford Electrical instruments), one in a wooden case with fuse protection and the other with a Bakelite case with mechanical cutout. These are both described as model D2 though the front panels are labelled  model D and have the 0S/10610 reference number

It would seem logical that there should also have been models A,B,F and G but I have not seen or heard of them.

Interpretation of Air Minisrty stores reference numbers mentioned above
5J    Batteries Primary and Secondary
5Q  Ammeters, Micro-ammeters, Milli-ammeters, Voltmeters and Milli-voltmeters
10A Miscellaneous Radio (Wireless) Equipment
10S Radio (Wireless and Radar) Test Equipment

Other Military Testmeters

Model 7 (ZD 00021)
Admiralty Pattern Model 47
Admiralty Pattern Model 48A.
Universal Avometer Model 8 (military version)
AM stores number 10S/16411  (AM pattern AP12945)
Test set No.1 (military version of Model 8/9 Mark II)
(NATO part number 6625-99-105-7050)