180 Chapter 3
Mode
Two Port Insertion Loss Measurement
Mode
Update On/Off (View)
This key lets you turn
Off active trace updating. That is, make it an inactive trace (or a
stored trace). This does not affect whether the trace is visible or not. Use the
Display
Show/Blank key to change its visibility.
When a trace becomes inactive, the following things happen:
• Updates to the trace stop after the current sweep is complete.
• The trace is displayed at half intensity (as long as it stays inactive)
• Inactive traces display across the entire X Axis of the instrument. Their horizontal
placement does not change even if X Axis settings subsequently are changed, although
Y-axis settings will affect the vertical placement of data.
• In most cases, inactive traces are static and unchanging; however, there are cases when
an inactive trace will update, specifically:
— If data is written to that trace from the remote interface
— If trace data is loaded from mass storage
When a trace becomes active (
Update = On), the trace is cleared, the average count is reset,
and the instrument prepares to begin a new sweep.
Display Show/Blank
This key lets you make a trace visible or not. In
Blank, traces do not display nor appear on
printouts but are otherwise unaffected. They may be queried and markers may be placed
on them.
Note that the action of putting a trace in
Blank does not restart the sweep and does not
restart averaging or hold functions for any traces.
Remote Command :TRACe[1]|2:TPILoss:UPDate[:STATe] ON|OFF|1|0
:TRACe[1]|2:TPILoss:UPDate[:STATe]?
Example TRAC2:TPIL:UPD 1 Makes trace 2 active
TRAC2:TPIL:UPD 0 Makes trace 2 inactive (stops updating)
Dependencies / Couplings Setting the trace type (even to the type it was already in) puts
the trace in
Update = On
Preset On for Trace 1; Off for 2
State Saved Saved in Instrument State
Key Path
Trace/Detector, Update On/Off (View)
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