General Tools and Instruments PWM301 - Manual (Page 11)

5. ZERO ADJUSTMENT
Power ON the meter and do not make the measurement,
if the display exist certain value ( not zero ), then it can
according the following procedures to make the Zero
Adjustment :
1)Power Off the meter, press the " Hold Button " ( 3-4,
Fig. 1 ) continuously ( not release ), then press the
" Power Button " ( 3-3, Fig. 1), until the " Display " (
3-2, Fig. 1) show the value, then release the both
buttons.
2)* Press the " Hold Button " ( 3-4, Fig. 1 ) once, the
Display will show the " HOLD " indicator and the value.
* Press the " REC button " ( 3-5, Fig. 1 ) once, the
Display will show the " CAL " text and go to make the
Zero adjustment, final the Display will show End " text
and finish the Zero Adjustment procedures, the
Display will show the zero value.
9