15-1
IM 760401-01E
Maintenance and Troubleshooting
15
Chapter 15 Maintenance and Troubleshooting
15.1 Adjustments
When the measurement values are erroneous, adjust this instrument using the following
procedures.
Required Equipments
AC Voltage/Current Standard (15 to 150 V, 0.1 to 5A/60 Hz)
recommended: FLUKE 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 (0.5%)
Recommended: Yokogawa 7555
Standard power meter
Recommended instrument: Yokogawa WT2000
Adjusting
Preparations
• Preparing this instrument
1. While pressing the SHIFT key, turn ON the power switch (adjustment mode).
Release the SHIFT key after the following sequence of events: illumination of all
LEDs, turning OFF of all LEDs, error 60 indication, error 78 indication, and then
indication of the model. “rAnGE” appears on display C.
Note
Error codes 60 and 78 appear, because all setup parameters are initialized when the instrument
enters adjustment mode. If you terminate adjustment mode (turn OFF the power switch) and
turn the power back ON, the WT210/230 starts with the setup parameters initialized.
2. Select “rAnGE” and press the ENTER key. Then let the instrument warm up for
at least 30 minutes. 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.
• Preparing the AC voltage/current standard and DMM
3. Warm up the AC voltage/current standard for at least an hour. Warm up the
DMM for at least an hour as necessary.
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: Aborts the adjustment and returns to the screen on which "rAnGE" is
shown on display C. The adjustment results are applied when the
WT210/WT230 is power-cycled to the normal measurement condition
(turning ON the power switch without pressing the SHIFT key).
RESET: Returns to normal measurement. However, all adjusted data will
become invalid.
CURRENT: 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.
VOLTAGE: 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.
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