Справочник Пользователя для Agilent Technologies A.18.00

S:\agilent\8920\8920b\PRGGUIDE\BOOK\SECTIONS\tm.sec

Settling refers to the amount of delay introduced to allow signal transients to 
propagate through the analysis chain and settle out. There are two options: 

1. Full settling introduces the appropriate delay for all signal transients which might have 

occurred at the front panel at just the same time as the trigger event, to pass through the 
analysis chain and settle out. Delays are also inserted to allow for internal hardware 
transients to settle. 

2. Fast settling introduces no delay for internal or external signal transients to settle. The 

programmer must account for transient settling before issuing the Trigger Event. 

There will still be delays introduced by the couplings between autotuning and 
autoranging. If the programmer wishes to remove these delays as well, all 
autoranging and autotuning functions must be turned OFF and the program must 
explicitly set the ranging amplifiers and the frequency tuning. Delays introduced 
by the measurement processes themselves cannot be eliminated. 

Bus Lock Up: If a measurement cycle does not successfully obtain a valid 
measurement result, it will continue to try until it does or until the measurement 
trigger is aborted. This is true for both retriggering modes. This has the 
consequence that both the GPIB bus and the Active Controller handshake are in a 
temporary holdoff state while the Active Controller waits to read the 
measurement result from the Test Set. 

The control program should include measurement time-out routines that CLEAR 
the bus and ABORt the trigger if a measurement does not complete within a 
specified amount of time. This provides a method of preventing the bus from 
remaining in the temporary holdoff state indefinitely.