Front Panel Operation - 5
53
3.
To make minor changes to an existing value, press
Current
. The procedure to change
an individual digit is explained in step 3 under "Set the output 2 voltage."
NOTE:
To draw current pulses greater than 1.5 A and up to 2.5 A peak on output 2, set the
output current limit higher than 1.5 amperes (1.52 amperes max). Do not enable OCP, or
else make sure that the protection delay setting is longer than the expected current pulse.
Enable the output
Action
Display
1.
On the Function keypad, press
Output On/Off
to enable output 2. The
Dis
annunciator will go off, indicating that the voltage is now applied to the output
terminals. The display indicates the actual output values. Note that when the outputs
are coupled, this command also enables or disables output 1.
2
8.003V 0.500A
4 - Querying and Clearing Output Protection and Errors
If
an overvoltage, overcurrent, overtemperature or remote inhibit condition occurs, the
Prot
annunciator
on the front panel will be on and the dc source will disable its output. If necessary, you can disable the
overcurrent or overvoltage protection circuit if its operation interferes with the proper operation of your
phone test. Note that if you disable the overvoltage protection, the equipment under test will not be
protected from output voltage overshoot conditions. You can also disable the broken sense lead detect
circuit if you have an application where an external voltage applied to the output may interfere with the
broken sense lead detect circuitry.
Error messages can occur at any time during the operation of the unit. When the
Err
annunciator on the
front panel is on it means that either an error has occurred on the GPIB bus, or a selftest error has
occurred. Appendix C lists error numbers and descriptions.
Query and clear the dc source overcurrent protection as follows:
Action
Display
1.
On the Function keypad, press
Protect
. In this example, an over current condition
has occurred. Refer to Table 4-2 for other protection indicators.
OVERCURRENT
2.
On the Function keypad, press
Current
. This displays the present current limit.
CURR 3.0712
3.
To restore normal operation
after the cause of the overcurrent condition has been
removed
, press
Shift, Prot Clr
. The
Prot
annunciator then will go off.
4.
To disable overcurrent protection, press
Shift, OCP
.
This key toggles between OCP
enabled and disabled. The OCP annunciator is off when OCP is disabled.
Disable Overvoltage Protection as follows:
1.
On the Function keypad, press
Shift, OV
. Use the
&
key and select OFF to disable
the overvoltage protection function. Then press
Enter
. To recall this state when the
unit turns on, save this state in location 0 and set the power-on state to RCL 0 (see
example #10).
PROT:STAT OFF
Query and Clear Errors as follows:
1.
On the Function keypad, press
Shift, Error
. This displays and clears the error in
the error queue. Repeatedly press these keys to clear all errors in the queue. If errors
persist, your unit may require service.
ERROR 0
