3.9 ZERO ADJUSTMENT (CAL MODE)
Zero adjustment start after pushing the [INV.] switch and then [CAL.] ([SHIFT]) switch.
・ When turning ON, the system automatically conducts a zero adjustment.
・ The time required for a zero adjustment differs depending on the setting of the
response switch. FAST: about 15 seconds; SLOW: about 50 seconds.
・ It is possible to conduct a zero adjustment even if you remove the cap.