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Front Panel Operation 45
Programming Current
You may program the Agilent SAS current without a load, but must have a load in order to draw output current. These tests
assume you have the load connected in accordance with the information in chapter 4 - User Connections and
Considerations. If you do not have a load on the Agilent SAS, you may connect a short across the output terminals as
described in chapter 3 - Turn-on Checkout.
The example will program a low current. (You may later increase the output current to the levels you will expect to use.) To
program the output current to 1.3 amperes, proceed as follows:
■ Disable the output by pressing . The Dis annunciator will turn on.
■ Program the voltage by pressing .
■ Press . The display will change from meter mode to indicate AMPS.
■ Press . If you discover a mistake before pressing erase the incorrect value with the backspace
key
.
■ The display will return to the meter mode and indicate up to 0.000.
■ Press to enable the output. Dis will turn off and the display will indicate VOLTS 50.00 AMPS 1. 300.
■ Now increase the current by pressing . Note that the current increases by a specific increment (depending on
the current programming resolution) each time you press the key and increases rapidly as you hold down the key. To
decrease the current, press
.
■ Try increasing and decreasing the current by rotating the Current knob clockwise and counterclockwise. Note how the
output responds as compared to using the Entry keys.
Disable the output by pressing
. The Dis annunciator will turn on. Now try to program a current greater than
the I
MAX
for your unit. Note that the display shows OUT OF RANGE.
Programming Overvoltage Protection
Overvoltage protection guards the load against voltages that reach a specified value above the programmed output voltage.
Setting the OVP Level
Assuming that you have programmed the Agilent SAS for 45 volts, you can set the OVP level to 48 volts as follows:
■ Press . The display will change from meter mode to indicate OV, followed by the present OVP value.
■ Press .
■ The display will return to the meter mode and indicate the output voltage (45.00 volts).
■ Press again. The display will now indicate OV 48. 00.
■ Press to return to the meter mode.
Checking OVP Operation
Assuming the above operating conditions (voltage programmed to 45 V and OVP programmed to 48 V), trip the OVP
circuit as follows:
■ Gradually increase the output voltage by pressing until the OVP circuit trips. This will cause the output
voltage to drop to zero and the Prot annunciator to go on.
■ There now is no Agilent SAS output due to an overvoltage condition.
■ To verify this, press and observe that the display indicates OV. This shows that the protection circuit tripped
due to an overvoltage condition.