Tektronix Keithley 2281 Series Reference Manual page 31

Section 2: General operation
This indicator has a different appearance based on the type of event that has been logged.
Icon Description
A serious error has occurred. These major errors are:

Overprotection error (overvoltage, overcurrent, or overtemperature protection).

Reverse sense leads.
A normal error has occurred. All the errors except the serious errors listed above are normal errors,
such as SCPI command errors and data overflow errors.
No new error or event messages have been logged since you last viewed the error log.
OUTPUT view area
This area displays the values for the present measurements and instrument status indicators.
The following table lists the indicators shown on the right of the OUTPUT view area.
Indicator
Output status
Fault status
Calculation status
Relative offset status
Remote status
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Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Status description
The instrument always has one of the following indicators visible:

OFF: The output is turned off.

CV: The output is turned on and the power supply is in constant voltage (CV)
mode.

CC: The output is turned on and the power supply is in constant current (CC)
mode.

DISABLE: The output is turned off and pressing the OUTPUT switch does
not turn on the output.
The fault status indicator means that an error occurred:

OVP: Overvoltage protection.

OCP: Overcurrent protection.

OTP: Overtemperature protection.

RVS: Reversed sense leads on rear panel.
CALC: If either math or filter operation is enabled, the CALC indicator is displayed
in the OUTPUT view area. If none of them are enabled, the CALC indicator is
cleared.
REL: If relative offset is enabled, the REL indicator is displayed.
RWLOCK: All of the front-panel keys are disabled. The instrument can only be
controlled using a remote interface.
077114601 / March 2019