Iwatsu SS-540 Instruction Manual page 29

4. Without clamping this instrument to the insulating target
conductor to be measured, press the open/close lever until
the "UNLOCK" marking disappears. Then check to make
sure that the sensor head is securely closed.
5. Press the DEMAG switch on the terminator. The process
takes about one second. A demagnetizing waveform is
output while demagnetizing is in progress.
6. Turn the zero adjust dial on the terminator and adjust the
trace to the zero position.
7. If you were not able to adjust the trace to the zero position
in the previous procedure 6, turn the rough adjustment
trimmer and adjust the trace so it is within the adjustment
range of the zero adjustment dial.
Chapter 2 Operation
25