3 Spectrum Analyzer Mode
3.9 SEM Measurement
View Update OFF; Display ON
Blank Update OFF; Display OFF
Background Update ON, Display OFF
Allows a trace to be blanked and continue to update “in the background”, which
was not possible in the past
In the Swept SA measurement, a trace with DisplayOFF is indicated by a
strikethrough of the type letter in the trace annotation panel in the Measurement
Bar. A trace with UpdateOFF is indicated by dimming the type letter in the trace
annotation panel in the Measurement Bar. In the example below, Traces 3, 4, 5 and
6 have UpdateOFF, and Traces 4 and 6 have DisplayOFF.
See: "More Information" on page 1742
Notes For the commands to control the two variables, Update and Display, see "Trace Update State On/Off"
on page 1741 and "Trace Display State On/Off" on page 1742 below
Dependencies When Signal ID is on, this key is grayed-out
Couplings Selecting a Trace Type for a trace (pressing the key or sending the equivalent command) puts the
trace in Active (Update ON and Display ON), even if that trace type was already selected
Selecting a detector for a trace (pressing the key or sending [:SENS]:DET:TRAC) puts the trace in
Active (UpdateON and DisplayON), even if that detector was already selected
Selecting a "Math Function" on page 1743 other than OFF for a trace (pressing the key or sending the
equivalent command) puts the trace in Active (UpdateON and DisplayON), even if that Math Mode was
already selected
Loading a trace from a file puts that trace in View regardless of the state it was in when it was saved;
as does being the target of a Copy or a participant in an Exchange
Trace Update State On/Off
Remote
Command
For Swept SA Measurement (in SA Mode):
:TRACe[1]|2|…|6:UPDate[:STATe] ON | OFF | 1 | 0
:TRACe[1]|2|…|6:UPDate[:STATe]?
For all other measurements:
:TRACe[1]|2|3:<meas>:UPDate[:STATe] ON | OFF | 1 | 0
:TRACe[1]|2|3:<meas>:UPDate[:STATe]?
where <meas> is the identifier for the current measurement
Example Make trace 2 inactive (stop updating):
:TRAC2:UPD 0
Spectrum Analyzer Mode User's &Programmer's Reference 1741
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