5.2
How to adjust
5.2.1 The transition to the adjustment mode
(1) Press the power switch while holding down zero adjustment switch and the data hold switch at
the same time.
(2) Make sure that the LCD is lit all, press and hold the light
switch over 1 second.
(3) LCD will show the software version and CAL mark
flashing, and then 2231-20 will move to the
adjustment mode.
5.2.2 Each key operation in the adjustment mode
①
Data hold switch: Change the adjustment point
②
Zero adjustment switch: Run adjustment
5.2.3 DC current adjustment
(1) Set to the adjustment mode (Measured value is shown
in the main display, adjustment point is displayed in the
sub-display).
(2) Connect the coil unit and current generator.
(3) Clamp the conductor of the coil unit.
(4) Ensure that the sub-display shows 0.00mA.
If the sub-display does not show 0.00mA, press the data hold switch, then the sub-display
will show 0.00mA.
(5) Generate the current as same as the adjustment point.
(6)
After waiting for 10 seconds, press the zero adjustment switch, to perform the adjustment.
(7) Press the Data Hold switch to move the next adjustment point.
(8) Up to -100mA, repeat (5) (6) (7) procedure.
Table 1 DC Current adjustment point
adjustment
procedure #
adjustment point
1
20mA range
0mA
2
+20mA
3
0mA
4
-20mA
5
100mA range
0mA
6
+100mA
7
0mA
8
-100mA
①
②
