Chapter 15 Maintenance And Troubleshooting; Adjustments - YOKOGAWA WT200 User Manual

Chapter 15 Maintenance and Troubleshooting

15.1 Adjustments

Required Equipments
Adjusting
IM 253421-01E
When the measurement values are erroneous, adjust this instrument using the following
procedures.
AC Voltage/Current Standard (0.02%, 30 to 300 V, 1 to 10 A/60 Hz)
recommended: Yokogawa 9100
or 2558 (if you want to carry out adjustments with an accuracy higher
than the one 2558 is providing, fine adjust the output using the Digital
Multi Meter (DMM) 1271)
DMM (0.05%)
recommended: Yokogawa 7552
Preparations
• Preparing this instrument
1. Turn ON the power while pressing the SHIFT key. Release the SHIFT key after
all LED's have lit up.
2. Press the ENTER key.
"rAnGE" will appear on display C. Press the ∧ or ∨ key and the display will
change to "Ein" (in case of the external input option), "dA" (in case of the D/A
option) or "End". The "rAnGE" mode is for adjustments of voltages or currents,
while the "dA" mode is for adjustments of the D/A output. This instrument has no
need for adjustment of power.
3. Select "rAnGE" and press the ENTER key. Then let the instrument warm up for
at least 30 minutes.
• Preparing the AC voltage/current standard and DMM
4. Allow a warm-up time of at least one hour for the AC voltage/current standard
and, if necessary, DMM.
Operating Keys
The keys to be used for carrying out adjustments, are as follows.
ENTER: Press this key to confirm every adjustment of each range.
SHIFT: Returns to the previous screen when aborting adjustment. However,
since the adjustments will not be displayed, turn the power OFF and
ON again.
RESET: Returns to normal measurement. However, all adjusted data will
become invalid.
A RANGE: Press this key to proceed to the following range without adjusting the
current range. When adjusting the D/A output, press this key to
move the new input value to the right.
V RANGE: Press this key to return to the previous range without adjusting the
current range. When adjusting the D/A output, press this key to
move the new input value to the left.
Adjusting the Voltage Range
1. Select "rAnGE" as described in the preparation above, press the ENTER key,
and the display will become as follows.
Display A rAnGE
Display B 30.00 V
Display C displays measurement value for five seconds.
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