Keysight N9038A MXE Service Guide            125
Instrument Messages
Condition Messages
Condition Errors 501 to 599, Frequency
This series of errors corresponds to the bits in the 
STATus:QUEStionable:FREQuency register. The second column in the table 
shows the corresponding bit in that register.
An event with the error number shown in the table means the condition has 
been detected. When the condition is cleared, an event with the error number 
plus 1000 is generated. These error numbers can be viewed in the Show Errors 
screen, along with the DETECTED and CLEARED indicators.
For example, error 503 indicates a Frequency Reference Unlocked condition 
has been detected, error 1503 indicates that failure has been cleared.
This register is summarized as bit 5 of the STATus:QUEStionable register, as 
described in the section “Condition Errors 601 to 699, Error Summaries” on 
page 126.
Err# Bit in 
status 
register
Message Error or 
Warning
More Information
501 0 Source Synth Unlocked E
503 1 Frequency Reference 
Unlocked
E
505 2
2
nd
 LO Unlocked
E
507 3 unused
509 4 LO Unlocked E
511 5 unused
513 6 IF Synthesizer Unlocked E
515 7 Calibration Oscillator 
Unlocked
E
517 8 unused
519 9 Demodulation E
521 10 Ref missing or out of 
range
E
521 10 Ref missing or out of 
range; External
E The external frequency reference signal is 
missing or is not within the proper 
amplitude range.
In PSA, this error was reported as error 
622
521 10 Ref missing or out of 
range; Pulse
E The pulse reference signal is missing or is 
not within the correct amplitude range.