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23.2
Current calibration
This is the measurement setup for current calibration:
At the digital measuring instrument, select the voltage measuring range according to the
maximum expected voltage drop at the measuring shunt (mV-range).
Set the DC output voltage to 20 % of the nominal output voltage.
Start the measurement series with low current:
10 % of nominal current
Increase in current steps of 2 A.
Compare measured (and then calculated) values with the values shown on the display
of the rectifier unit.
Consider:
The measured voltage at the measuring shunt is a reference voltage for the actual
current! You need to calculate the real current value that is related to the measured
voltage.
Example:
The measuring shunt has a nominal current capability of 60 A. The voltage drop at the
shunt is specified with 60 mV at 60 A (shunt with 1 mOhm).
If you measure 6.00 mV, the DC output current is 6 A
If you measure 30.00 mV, the DC output current is 30 A.
If you measure 60.00 mV, the DC output current is 60 A
Please check if your measurements are within the admissible deviation range of the
device. If the measurements are out of admissible range, please contact the
manufacturer.
Make sure the DC
cables have sufficient
cross section for the
maximum expected
DC current!