The DVM210 panel meter is mounted in a case with battery, on/off switch and range switch. The voltage ranges are nominally
10V, 1V and 100mV, with actual ranges going to 1999. The meter is intended for use with the variable power supply, using the
10V range, and as a per cent thd meter, using the 1V range. The DVM210 module is not easy to use, it needs a floating supply,
which is why it is mounted in a separate case. Its solder pad connections are small and difficult to access.
The internal wiring is on the front panel.
The front panel carries the panel meter, range switch, terminals and on/off switch.
Note: The DVM330 series does permit operation off instrument supplies but is more expensive.