DC AvoMinor (AVO Minor Meter) 1935 Version

DC Volt-Ohm Meter

Second of the DC Avominor series of small multimeters.

This version introduced in 1935 was provided with a socket in the centre of the ohms adjustor knob to enable resistance measurement greater than 60k Ω using an external 6 Volt battery.

Ranges;

2mA 2.5 inch moving coil meter
DC 6, 60, 300 volts - sensitivity 3mA
DC 12, 120, 600 volts - sensitivity 6mA
DC 3, 6, 30, 120 mA
R 10kohm (~340 ohm center)

and with external battery using socket in ohms adjuster.:
R 60kohm (on 6V range)
R 600kohm (on 60V range)
R 3megohms (on 120V range)

In questo link sono elencati 82 modelli, di cui 79 con immagini e 41 con schemi.
Elenco delle radio e altri apparecchi della Avo (Brand), Automatic Coil Winder and Electrical Equipment Co., Avo Ltd; London