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IM 253401-01E
• External sensor input (equipped with option /EX2)
Change as follows for wiring currents only.
AC voltage
Synchronizer
standard
Preparation
Set the frequency of the AC voltage standard and of each channel of the synchronizer to 60Hz.
Then, while not exceeding the maximum values of the external synchronization inputs of the
voltage and current standard, rise the output level of the synchronizer until the standards are
synchronized. Make sure that the phase angle between each channel of the synchronizer is 0
degrees.
Calibrating
1 Set the voltage or current range of this instrument to the range to be calibrated.
2 Set the output voltage of the AC voltage standard to the rated range of this instrument, and
output the voltage.
3 Set the output current of the AC current standard to the rated range of this instrument, and
output the current.
4 Fine adjust the output values of the standard so that the displayed voltage or current value on
this instrument show the rated range.
5 Read the output voltage or current value, and keep it as a reference.
6 Verify that the displayed power value corresponds to the rated value. The product of the
voltage value and the current value is the reference value of the power.
Note
• Before starting the above described calibration, verify that the accuracy of this instrument lies within the
specifications.
- Adjust the output of the standard to the rated range value of this instrument, then read the displayed
voltage or current value on this instrument and verify that this value lies within the specifications.
- Slightly change the phase angle of ch2 of the synchronizer (current signal) so that the displayed power
value becomes the rated value. Then read the displayed power value on this instrument and verify that
this value lies within the specifications (power factor = 1).
- Change the phase of ch2 of the synchronizer so that the displayed power value becomes zero. Then
read the displayed power value on this instrument and verify that this value lies within the
specifications (power factor = 0).
• When calibrating the harmonic analysis, match the phase so that the displayed power value becomes the
calibrated value.
• When calibrating using a frequency of more than 60Hz, set the same frequency for the synchronizer and
the standard. In such a case, use a voltage/current standard which surely has a sufficient accuracy
regarding the output frequency. This means to use measuring equipment with an accuracy of 3 to 4 times
the specified higher accuracy of this instrument.
14.2 Calibration
EXT
H
± (A)
L
EXT
± (A)
EXT
± (A)
EUT
14
14-7
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