Filter
Top Products
2 - General Information
30
Input Control
Short On/Off
A module can simulate a short circuit at its input by turning the load on with full-scale current. The short circuit
can be toggled on/off at the front panel using the SHORT command in the Func menu, or via the GPIB
(INPUT:SHORT ON|OFF command). The short on/off change uses the slew rate setting of the active mode
and range.
The actual value of the electronic short is dependent on the mode and range that are active when the short is
turned on. In CV mode it is equivalent to programming zero volts. In CC mode it is equivalent to programming
full-scale current for the present current range. In CR mode it is equivalent to programming the minimum
resistance for the present resistance range.
Note that turning the short on in CV mode may cause the load to draw so much current that the software current
limit operates, which may turn the input off.
Turning the short circuit on does not affect the programmed settings, and the load input will return to the
previously programmed values when the short is turned off.
Input On/Off
A module's input can be toggled on/off at the front panel, or via the GPIB (INPUT ON|OFF command). The
input on/off change does not use the slew rate setting so the input will change at the maximum slew rate.
Turning the input off (zero current) does not affect the programmed settings. The input will return to the
previously programmed values when the input is turned on again. Note that the Input On/Off command
supersedes the mode commands and Short On/Off command.
Protection Features
Each load module includes the following protection features:
• Overvoltage.
• Overcurrent (hardware and software).
• Overpower.
• Overtemperature.
• Reverse Voltage.
The appropriate bit(s) in the mainframe's status registers are set when any of the above protection features are
active. Also, the Prot annunciator comes on and the front-panel alphanumeric display indicates which
condition(s) have been detected. For example, if an overtemperature (OT) condition has been detected causing a
module's input to be turned off (protection shutdown, PS), the display will indicate "PS OT".
Resetting Latched Protection
All of the protection features latch (remain set) when they are tripped, except for the hardware overcurrent and
reverse voltage. The latched protection features can be reset via the GPIB (*RST or INP:PROT:CLE
commands) or at the front panel. Of course, the condition that caused the protection feature to trip must be
removed or it will trip again as soon as it is reset.