3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
control how the number of Max Hold traces taken; however, many users need a way
of stopping and then resuming a Max/Min Hold without clearing the accumulated
result.
In the past you could stop and start Max Hold by going back and forth between
Single and Continuous. Currently, neither X-Series nor legacy instruments like ESA
and PSA clear the Max or Min Hold when going from Cont to Single and vice versa;
so, you can go to Single to stop temporarily and then resume the Max or Min Hold
by going back to Cont. However, in X-Series, because Max and Min Hold obey the
Average/Hold Number, this is not an effective method for stopping a sweep, until
you have reached the terminal count. Also, Restart is sometimes used as part of this
method and in the X-Series, Restart clears the accumulated Max/Min Hold, whereas
in the PSA (for example) it does not.
The Average/Hold switch in the Legacy Compatibility menu solves this problem.
When this switch is On, the following is true for traces in Max Hold or Min Hold:
–
They pay no attention to the Average/Hold number; “Single” for Max Hold and
Min Hold causes one sweep only, so going to Single stops after the current
sweep, and going to Cont starts you going again without clearing the
accumulated result
–
They do not clear the Max or Min Hold on Restart or Single, or :INIT:IMM
(changing a measurement parameter like frequency or bandwidth, etc. would
still restart the max/min hold)
Note that whenever any trace is in Average, the Single/Cont controls do tie in to the
Avg/Hold Number, and pressing Singledoes cause a set of sweeps (100 by default).
This is also true in PSA.
Remote Command
:CONTrol:COMPatible:TRACe ON | OFF | 1 | 0
:CONTrol:COMPatible:TRACe?
Example
:CONT:COMP:TRAC ON
ON means exhibit legacy average/hold behavior
Preset Unaffected by Mode Preset. Set to OFF by Restore Mode Defaults
State Saved Saved in State
Detector
In the HP/Agilent ESA Spectrum Analyzer, the default detector is Peak. In later
instruments, Normal (which does alternate peak and pit detection) is the default,
but ESA did not have this detector. For ESA compatibility, the Detector switch in the
Legacy Compatibility menu causes the Detector Auto Rules to select the Peak
detector instead of the Normal detector for the conditions under which the Normal
detector would otherwise be chosen.
Spectrum Analyzer Mode User's &Programmer's Reference 427
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