Iwatsu SS-293S Instruction Manual page 24

Chapter 4 Measurement
The current detection polarity is shown as in the following figure.
Positive polarity is output by current flowing in the direction indicated
by the current direction mark shown on the joint box.
(4) Turn on this instrument (this instrument is turned on by turning the
slide switch shown in the following figure to the I side and off by
moving the switch to the O side).
(5) Adjust the zero point of the output observed by monitoring devices.
a) Have the accessory screw driver (−) ready.
b) As shown in the figure below, there is a hole for zero point
adjustment on the side of ZERO ADJ on the main unit panel.
Insert the screw driver (−) into the hole.
c) Turn the screw driver while watching the monitoring device to
perform zero point adjustment.
(6) Energize the target to be measured, and then observe and measure
the output with the monitoring device.
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Current direction mark
Figure 4.2 Current Detection Polarity
Current to be measured
Screw driver (−)