The microvoltmeter has a sturdy plastic case with a carrying handle which can be adjusted in 30° steps. Controls and indicators are installed in a clear, logical configuration and are grouped together in accordance with the various functions of the unit.
The microvoltmeter is a highly accurate moving coil instrument equipped both with batteries and with a mains connection. Two scales with 10-unit and 3-unit divisions are provided. Fullscale ranges from 10 µV to 300 V.
The automatic polarity switching ensures correct readings irrespective of polarity. Two Led´s on the front panel indicate the polarity of the voltage measured. A control is provided for zero adjustment in the µV-range.
The 16 Hz and 50 Hz active sharp cutting low-pass filters installed in the unit can be switched-on to eliminate interference AC frequencies.
The front panel also houses a 1 Volt output socket for the connection of an external chart recorder to document the measurements. A special isolating amplifier is connected to the socket to isolate it from the input circuit. Recorders with earthed inputs can therefore be connected without distorting the measurements.
Power supply is either 230 Volt from the mains or from the built-in lead gel batteries. The unit is equipped with a built-in battery charger and an automatic monitoring system and protection against excessive discharging. Both battery charging and the actual battery capacity are indicated.
A DC / DC converter with a screwed plug connecting to the rear panel of the unit is available as an optional extra to permit the use of a 12 Volt car battery to power or charge the unit during field measurements.