Adjustments - YOKOGAWA WT110 User Manual

14.1 Adjustments

Required Equipments
Adjusting
IM 253401-01E
When the measurement values are erroneous, adjust this instrument using the following
procedures.
AC Voltage/Current Standard (0.02%, 30 to 300V, 1 to 10A/60Hz)
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 (0.5%)
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
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 30.00V
Display C displays measurement value for five seconds.
2 Connect the voltage output of the AC voltage/current standard to the voltage input terminal of
this instrument. Connect the H terminal of the standard to the V terminal of this instrument,
and connect the L terminal of the standard to the ± terminal of this instrument. In case of the
WT130, bundle all V terminals together and bundle all ± terminals together.
3 Set the output voltage of the standard to 30.00V and output this voltage.
again.
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