E16
7-3.Internal adjustments
The unit was accurately adjusted at the factory before shipment. So, readjustment is suggested only when the accuracy
of circuit is affected by the repair, or when you have the reason to believe that the unit is out of accuracy. The
recommended calibration device is a multimeter with an accuracy of ±0.1% dcv or better.
If readjustment is required, proceed the following procedure. Locations of the adjustments are shown in Fig. 6-1 and
Fig.6-2.
(1) Adjustment of the Rating Voltage
A. Connect an accurate (±0.1%) external multimeter to measure the dc voltage at output terminals of the power
supply.
B. Set the COARSE and FINE VOLTAGE controls to maximum (fully clockwise).
C. Adjust trimmer VR301 for a reading on the multimeter to be 18.50V for IPS-1820D, 36.50V for IPS-3610D, and
60.50V for IPS-606D.
D. Adjust trimmer pot VR2 to set the reading value of voltmeter as same as the one shown on the multimeter..
(2) Adjustment of the rating Current
A. Set the CURRENT control to HI.
B. Set the COARSE and FINE CURRENT controls to minimum (fully counterclockwise).
C. Set the COARSE and FINE VOLTAGE controls to the center position.
D. Connect an external multimeter to measure dc current of output terminal.
E. Adjust trimmer VR304 to have a reading of –0.00A indicated on the current meter.
F. Set the COARSE and FINE CURRENT controls to maximum (fully clockwise)
G. Adjust trimmer VR303 for a reading on the multimeter to be 20.10A for IPS-1820D, 10.10A for IPS-3610D, and
6.10A for IPS-606D.
H. Adjust trimmer VR2 to set the reading value of voltmeter as the same as the one shown on the multimeter.
I. Set CURRENT control to LOW.
J. Adjust trimmer VR310 to set the reading value of voltmeter as 0.5 times to the rating current.
K. Adjust trimmer VR401 to set the OVP value.
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