
1
Getting Started
40
Keysight U2040 X-Series User’s Guide
LED Indicator Sequence During Power-Up for the U2041XA/42XA/
43XA/44XA Sensor
Other LED indicators
Power up
Off
Power on
Internal zeroing and calibration
Ready to use
HW/OS error
Zeroing and calibration error
Send the
SYST:ERR?
query to read the
error message. It is recommended to
return the U2040 X-Series to Keysight if
this condition persists after power cycle.
Green
Amber
Red
Red
blinking
Table 1-1
Other LED indicators
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.
Amber
Red
Green
blinking