AMETEK SGI Series - Manual (Page 114)

Calibration and Verification Sorensen SGI Series
4-62 M550221-01 Rev AA
4.2.1 Constant-Current Mode
1. Setup the SGI Series unit to operate with remote current programming
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 current programming
voltage-source.
4. Set the current programming source to 0.0 V ±1mV.
5. Program the output voltage, with the front panel control or remote
interface, to 100% of rated output voltage.
6. Apply AC power, turn the unit on, and press the "Output On" button to
enable the output (see Section 3.1.1).
7. Set the current programming voltage to 5.0 V ±1mV.
8. 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.
9. Set the current programming source for 0.5 V ±1 mV.
10. 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.
11. 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 with remote voltage programming
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. Program the output current, with the front panel control or remote
interface, to 100% of rated output current.
4. Apply AC power, turn the unit on, and press "Output On" button to enable
the output (see Section 3.1.1).