Tektronix Keithley 2268 Series, Справочное руководство

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Series 2268 850 Watt DC Power Supplies Reference Manual Remote Operation
2268S-901-01 Rev. A / January 2015 161
Over Temperature Protection
The over temperature protection (OTP) is the alarm that protects the unit in case of
ventilation blockage, fan failure, or some other event that causes the unit to overheat. The
OTP cannot be masked to disable it. The OTP alarm can have its output latch on clearing. See
“Alarm Output Latching” on page 48.
The SCPI command (s) for these instructions are:
[:]SYSTem[<channel(s)>]:PROTection:LATCh
The On setting shown by the front panel (“Using Over Temperature Protection Lock (OTP)”
on page 52), maps to having the OTP latch flag set. The OFF setting maps to having the OTP
latch flag cleared. The default is to have the flag cleared.
Loop Protection Enable/Disable
The Loop Protection is described in “Loop Protection” on page 54. Enabling Loop Protection
(LOOP PRO on front panel) will allow the Loop Protection feature to trigger based on the
conditions described in “Loop Protection”, page 54. This feature can be controlled by either
front panel operation or SCPI command as shown below. The default value of Loop
Protection is set to Disabled.
Important:
While Loop Protection is enabled (set to ON), the external
shutdown function will be automatically set to low active. When Loop
Protection is disabled (set to OFF), the external shutdown function will be set to
the user’s last setting.
Commands:
[:]OUTPut[<channel>]:PROTection:LOOP{?|ON|OFF}
Where
ON enables the use of Loop protection. Returns 1.
OFF disables the use of Loop protection. Returns 0.
Interlock Enable/Disable
The Interlock feature is explained in “Interlock Function” on page 56. Use the command
below to enable and disable interlock. Enabling interlock will allow the interlock feature to
trigger based on the conditions described in “Interlock Function” on page 56. This feature
can only be controlled using a SCPI command as there is no front panel equivalent. The
default value of the interlock is set to Disabled.
Important:
The Interlock alarm cannot be masked or latched through the
alarm protection mechanisms. It can only be enabled or disabled using the
following command.
Commands:
[:]SENSe[<channel>]:PROTection:INTerlock[:STATe] {?|ON|OFF}
Where
ON enables the use of interlock protection.
OFF disables the use of interlock protection.