Martel Electronics 320 - Manual (Page 36)

INPUT FUNCTIONS
VOLTS
The Model 320 measures voltage at the volts terminals
at the lower left corner of the keypad area. The
negative terminal is common to volts and milliamps
measurements.
To measure voltage, press the V/mA Key, until Volts
is displayed on the upper line of the LCD display. If
you have a Model 320 wih 2 pressure sensors, you
must first ensure that volts/mA are available by
pressing the Port Select key.
There are 2 voltage ranges and the Model 320
autoranges between them. The ranges are 0-10.000V
and 0-30.00V. When the input voltage exceeds
approximately 11 volts, the Model 320 will change to
the 30V scale. When the input voltage falls below
10.5 volts, the Model 320 switches back to the 10V
scale.
MA
The Model 320 measures current at the mA terminals
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