DO4A Issue 3/2001
8
8.
Description of Controls
Fig. 8-1 Description of Controls
8.1 Auto-zero
For measurements where thermal emf can cause a large measuring zero error, it is
possible to cancel this using the auto-zero button. First connect the potential leads to
the sample to be measured in the usual way, then connect the C & C1 terminals
together at the sample.
Press the auto-zero, the LED will illuminate and the zero offset will be measured and
stored as an offset. Reconnect the current leads in the normal measurement
configuration and the resistance reading will be displayed with the zero offset
eliminated. The LED will stay lit to warn that an offset is stored. This offset and
lamp will be cancelled if the range is changed or the instrument switched off. A
maximum of ±100 digits can be offset.
4 DIGIT LCD
DISPLAY
ON/OFF
POWER
SWITCH
STATUS
WARNING
LAMPS
MEASURING
TERMINALS
6 RANGE
SWITCHES
AUTO ZERO &
CALIBRATION
