User`s guide

Front Panel Operation - 5
51
Set the output compensation
Action Display
1.
On the Function keypad, press Output. Then press q until you obtain the
TYPE:CAP command. Use the ä key and select either LOW or HIGH. Then press
Enter. Use
HIGH compensation for phones with input capacitances greater than
5 µF. Use LOW compensation for phones with input capacitances under 5 µF.
TYPE:CAP HIGH
Enable the output
Action Display
1.
On the Function keypad, press Output On/Off to enable the output. The Dis
annunciator will go off, indicating that the voltage is now applied to the output
terminals. The A display indicates the actual output current.
8.003V 0.500A
2 - 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. Then press q to obtain the PROT:STAT
command. Use the ä key and select OFF to disable the overvoltage protection
function. Then press Enter. To recall this state when the unit is powered on, save
this instrument setup or state in location 0 as explained in example #6.
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