In message , T i m
writes

Turn the 'Coarse' voltage knob down from 12 to 5V, or as near as you
can get with that control. If required, turn the 'Fine' voltage
control to get a more accurate value.

For my fairly basic use, I just leave both the fine controls and the
amps at maximum, and use the coarse volts knob for control. The huge
advantage is the digital readout which shows both volts and amps
simultaneously, which is important for older motors. Just one example
is pre war permanent magnet motors. The magnets tend to degrade over
time, and consume more and more amps for the same performance, which
leads to overheating and damage to motor windings. Watching amps
consumed, and knowing the usual usage, is therefore important.
--
Graeme