User manual
2638A 
Users Manual 
7-6 
Table 7-1. Error Messages (cont.) 
Error Code  Error Message  Causes and Solutions 
Error 306 
Not waiting for 
reference 
Cause: CALibrate:NEXT command with a reference value 
was received, but the reference value is not allowed for 
current step. 
Solution: Check the parameter value and try again. 
Error 307 
Continue command 
ignored 
Cause: CALibrate:NEXT command was received, but it is not 
expected for current calibrate step. 
Solution: Check the parameter value and try again. 
Error 318 
Reading does not 
match reference 
Cause: The measured value out of range, it might be caused 
by wrong input signal or hardware defect. 
Solution: Make sure that the input signal matches the 
requirement. If the input signal is correct, cycle the power. If 
the error occurs again, contact Fluke Calibration (see Chapter 
1). 
Error 320 
Timeout waiting for 
reading 
Cause: Timeout while waiting readings from inguard. 
Solution: Cycle the power. If the error occurs again, contact 
Fluke Calibration (see Chapter 1). 
Error 322  Password missing 
Cause: CALibrate:ENABle command was received to unlock 
the calibration but ADMIN password is not provided. 
Solution: Make sure that ADMIN password was sent with the 
CALibrate:ENABle command. 
Error 323  Wrong password 
Cause: CALibrate:ENABle command was received to unlock 
the calibration but the ADMIN password is wrong. 
Solution: Make sure that correct ADMIN password was sent 
with the CALibrate:ENABle command. 
Error 324  Calibration locked 
Cause: The calibration is locked when a CALibrate command 
was received.  
Solution: Use the CALibrate:ENABle command to unlock the 
calibration first. 
Error 398  Anomalous error %d 
Cause: Unknown error occurred during the calibration 
procedure. 
Solution: Restart the calibration procedure. If the error 
occurs again, contact Fluke Calibration (see Chapter 1). 










