YOKOGAWA WT200 User Manual page 224

15.2 Calibration
Calibration of the Harmonic Analysis Function
Verification of Functions
15-10
Connection
Use the same instruments as those used for AC power measurement. The wiring
diagrams are the same as those given in "Calibration of AC Voltage, Current, and
Power" (see pages 15-7 and 15-8).
Preparation
1. Set the voltage range of this instrument to 15 V, and the current range to 1 A.
2. Turn the harmonic analysis function ON.
Calibrating Currents
1. Set the ch1 of the synchronizer to 60 Hz, ch 2 to 900 Hz (15 times) and output
these frequencies.
2. Set the frequency of the voltage standard to 60 Hz, the output voltage to 15 V
and output the voltage.
3. Set the frequency of the current standard to 900 Hz, the output current to 1 A
and output the current.
4. Set the displayed number on display A of this instrument to 15.
5. Set the display function of display B to A and verify that the displayed value lies
within the specifications.
6. If required, change the ch2 setting of the synchronizer and the frequency of the
current standard, and verify another number.
7. Turn the output of the voltage and current standard OFF.
Calibrating Voltages
1. Set the ch1 of the synchronizer to 900 Hz (15 times), ch 2 to 60 Hz and output
these frequencies.
2. Set the frequency of the current standard to 60 Hz, the output current to 1 A and
output the current.
3. Set the frequency of the voltage standard to 900 Hz, the output voltage to 15 V
and output the voltage.
4. Set the displayed number on display A of this instrument to 15.
5. Set the display function of display B to V and verify that the displayed value lies
within the specifications.
6. If required, change the ch1 setting of the synchronizer and the frequency of the
current standard, and verify another number.
7. Turn the output of the voltage and current standard OFF.
Auto Range Operation
1. Set the voltage or current range of this instrument to Auto range. In case of no
voltage or current input, the voltage range will become 15 V, and the current
range will become 0.5 A automatically.
2. Press the V RANGE key to verify the 15 V range and then press this key once
more.
3. Press the A RANGE key to verify the 0.5 A range and then press this key once
more.
4. Connect the output terminal of the voltage standard (either AC or DC) to the
voltage input terminal of this instrument, and connect the current standard to the
current input terminal.
5. Set the output voltage of the voltage standard to 600 V and output this voltage.
6. Verify that the display shows "- - - - -" as the measured voltage value for approx.
1.5 seconds and then changes to 600 V.
7. Turn the output of the voltage standard OFF.
8. Set the output current of the current standard to 20 A and output this current.
9. Verify that the display shows "- - - - -" as the measured current value for approx.
1.5 seconds and then changes to 20 A.
10. Turn the output of the current standard OFF.
IM 253421-01E