Current Mode Operation - Ametek SPS A Series Operation Manual

AMREL SPS-A Series

3.3.4 CURRENT MODE OPERATION

When the supply is in the Current Mode, the output current of the supply
is controlled by the Current knob on the front panel or by the remote
current input (see Section 3.4). The Voltage control knob (or remote
voltage input) operates as a voltage limit. To verify operation in current
mode, follow the steps below:
1. Connect a high current DC ammeter across the rear panel positive
and negative output terminals, observing the correct polarity.
2. Select wire leads of sufficient current carrying capacity and an
ammeter range compatible with the unit's maximum rated output
current.
Note: If a high current ammeter is not available, you may simply
short the output terminals together. This will not harm the supply.
3. Rotate the Voltage control knob about ½ turn clockwise (this sets
the Voltage limit at a nominal setting above 0 Volts and forces the
supply into current mode).
4. Switch the power supply on.
5. Slowly rotate the Current knob clockwise and observe both the
front panel current display and the output of the ammeter.
The minimum range should be from 0A to the maximum rated
current output of the supply.
The front panel display and ammeter readings should track within
the accuracies of the meter and the front panel display.
6. Check that the green Current Mode LED is on.
7. Turn the Voltage knob and Current knob fully counterclockwise.
8. Switch the power supply off.
9. Disconnect the ammeter or short from the output terminals.
If Current Mode operation did not function as indicated above, recheck
your setup and perform the check again. If the function continues to fail,
contact the factory for assistance.
M550129-01 Rev A
Operation
3-11