Sorensen SGI Series Calibration and Verification
M550221-01 Rev U 4-3
4.2.1 Constant-Current Mode
1. Setup the SGI Series unit to operate in remote current programming
mode using an external 0-5 VDC voltage source, as shown in Figure 3-15
in Section 3.10. Ensure that Pins J1-5 and J1-6 are jumpered to enable
the output.
2. Connect a precision current shunt across the output of the power supply,
and attach a precision meter across the shunt Kelvin terminals. (see
Section 4.1.2 ).
3. Attach a precision meter in parallel with the voltage programming source.
4. Set the voltage source to 0.0 V ±1mV.
5. Apply AC power, turn the unit on, and press the "Output On" button to
enable the output (see Section 3.1.1).
6. Set the programming voltage to 5.0 V ±1mV.
7. Verify that the unit produces 100% ±0.8% of rated output current. If
necessary, adjust R69 for 100% of rated output current through the shunt.
8. Set the programming source for 0.5 V ±1mV.
9. Verify that the unit produces 10% ± 0.8% of rated output current. If
necessary, adjust R55 for 10% of rated output current through the shunt.
10. Repeat the steps above as required to obtain the required accuracy.
4.2.2 Constant-Voltage Mode
1. Disconnect the AC mains power to the unit. Remove the current shunt
from the output and verify that there is no load attached.
2. Remove the precision meter leads from the current shunt and apply them
across the output terminals.
3. Setup the SGI series unit to operate in remote voltage programming
mode using an external 0-5 VDC voltage source, as shown in Figure 3-17
in Section 3.11. Ensure that Pins J1-5 and J1-6 are jumpered to enable
the output.
4. Apply AC power, turn the unit on, and press "Output On" button to enable
the output (see Section 3.1.1).
5. Set the programming source to 5.0 V ±1m V.
6. Verify that the unit produces 100% ±0.25% of rated output voltage. If
necessary adjust R74 for 100% of rated output voltage.
7. Set the programming source to 0.5 V ±1 mV.
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