1 Getting Started
20 Keysight U2020 X-Series User’s Guide
LED Indicator Sequence During Power-Up
Other LED indicators
Power up
Green
Power on
Send the SYST:ERR? query
to read the error message. It
is recommended to return
the U2020 X-Series to
Keysight if this condition
persists after power cycle.
HW/OS error
Red
blinking
Amber
Red
Zeroing/calibration error
Internal zeroing and calibration
Off
Ready to use
Secure erase, flash formatting, or firmware update in progress.
An error is present in the SCPI error queue including input overload. If the error
queue is cleared (via the *CLS command) or the last error is read from the queue (via
the SYST:ERR? query), the indicator will turn off.
USB activity in progress.