SIFCOTechnoPlate Power Pack_2019-05-06_V1.5_e.doc
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23
Checking calibration
To check calibration of DC output current and voltage, some special tools are required:
- digital measuring instrument for voltage measurements with high-end measuring lines
The measuring instrument needs to be calibrated. The accuracy of the measuring
instrument must be better by a factor of 10 than the accuracy of the device to be
calibrated.
- Ohmic load 60 Ohm 60 W (see below sketch) for the voltage measuring procedure
- Calibrated precision shunt that is capable for the maximum expected DC current of
the rectifier unit (1 mOhm shunts are used in standard calibration applications of the
DC power supply units).
Generally
It is not necessary to open the device! You just need to connect the measuring
instrument, the shunt and the basic load to the DC output contacts of the rectifier unit.
The rectifier unit should have the normal environmental temperature.
It is recommended to use the original CAM LOCK connectors.
23.1
Voltage calibration
Connect the basic load resistor 60 Ohm / 60 W to the DC output terminals.
Connect the measuring lines of the digital measuring instrument to the DC output
connectors of the rectifier unit.
At the digital measuring instrument, select the voltage measuring range according to
the maximum expected DC voltage output of the rectifier unit.
Turn on the main switch.
Set the DC current to 1.50 A. Set the DC voltage to 1.00 V
Press the ON key (you need to operate in manual mode, not in BUS control mode).
Select Step “00”, normal operation.
Set the DC voltage to several levels and check the measured values on the digital
measuring instrument. Compare with the values shown on the display of the rectifier unit.
Start with 1 V, check in steps of 2 V until the nominal voltage is reached.
Example: 60 A / 20 V
set in %
set value
measured
display
5%
1.00 V
1.03
1.00
10%
2.00 V
2.01
2.01
15%
3.00 V
3.00
3.00
20%
4.00 V
4.03
4.02
. . . . and so on