Tektronix Keithley 2268 Series, Справочное руководство

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Local Operation Series 2268 850 Watt DC Power Supplies Reference Manual
56 2268S-901-01 Rev. A / January 2015
INTERLOCK FUNCTION
The Interlock function can be used to wire an external shutoff switch that can be used to
enable or disable the power supply output. When the switch is closed, the power supply will
operate normally. If the switch is opened, the power supply will trigger the interlock alarm.
The output will be disabled, the display will blink
, and the ALARM LED will
illuminate. This alarm will automatically clear when the switch closes again, and the output
will automatically be restored to its pre-alarm state (either enabled or disabled). The interlock
function can only be enabled or disabled (defined) using a SCPI command (cannot be
masked or latched through the alarm protection mechanisms.). Common applications include
an emergency shutoff switch or a door switch.
Connect the switch between pins J3.14 and J3.15 on the AUX Output and Isolated Analog
Programming Connector.
Defining the Interlock Mode
The Interlock mode is controlled via SCPI commands. There is no front panel access for
enabling or disabling the Interlock functionality. See “Interlock Enable/Disable” on page
161.
The SCPI command for setting the Interlock mode to On or Off is:
[:]SENSe[<channel>]:PROTection:INTerlock[:STATe]
OUTPUT PROTECTION
The output voltage and the output current can be programmed (preset) to automatically start
at zero Volts and zero Amps upon power-up and upon output enable. Also, each can be
reprogrammed to disable the automatic reset to zero.
Programming Voltage Output Preset
To Enable/Disable automatic reset to 0 Volts:
1. Turn the rotary Adjust/Enter control to PRT and press.
2. Turn again until is displayed.
3. Press to display
.
4. Turn to display or .
5. Press to commit the selected setting.
Important:
This single front panel operation affects both power on and output enable.
However, when using SCPI, there is a separate command for each.
The SCPI command to query or enable/disable the 0 Voltage Output Preset at
power-on is:
[:]SYSTem[<channel>]:PON:VOLTage {?|ON|OFF}
The SCPI command to query or enable/disable the 0 Voltage Output Preset upon
output enable is:
[:]SYSTem[<channel>] :PON:ENAble:VOLTage {? |ON|OFF}