Keysight E6640A, Measurement Applications User & Programmer Reference

Page: 1592 / 2870

11 Occupied Bandwidth Measurement
Sweep/Control
In some models, a variety of burst trigger circuitry is available, resulting in various available burst trigger
bandwidths. The analyzer automatically chooses the appropriate trigger path based on the hardware
configuration and other settings of the analyzer.
Key Path
Trigger
Example TRIG:SOUR RFB Swept SA measurement
TRIG:<meas>:SOUR RFB Measurements other than Swept SA
State Saved Saved in instrument state
Status Bits/OPC
dependencies
The Status Operation Register bit 5 "Waiting for Trigger" is set at the same time as the Sweeping or
Measuring bit is set. It is cleared when the trigger actually occurs (that is, after the trigger event
occurs and all the applicable trigger criteria have been met). A corresponding pop-up message
("Waiting for trigger") is generated if no trigger signal appears after approximately 2 sec. This
message goes away when a trigger signal appears.
Backwards Compatibility
Notes The legacy command:
:TRIGger[:SEQuence]:RFBurst:FSELectivity[:STATe] OFF|ON|0|1
is not supported in the X-Series, as the hardware to do Frequency Selective burst triggers does not
exist in X-Series.
Initial S/W Revision Prior to A.02.00
Modified at S/W Revision A.04.00
Absolute Trigger Level
Sets the absolute trigger level for the RF burst envelope.
When using the External Mixing path, the Absolute Trigger Level is uncalibrated because the factory
default was set to accommodate the expected IF levels for the RF path.
Key Path
Trigger, RF Burst
Scope Meas Global
Remote Command :TRIGger[:SEQuence]:RFBurst:LEVel:ABSolute <ampl>
:TRIGger[:SEQuence]:RFBurst:LEVel:ABSolute?
Example TRIG:RFB:LEV:ABS 10 dBm
sets the trigger level of the RF burst envelope signal to the absolute level of 10 dBm
Notes Sending this command does not switch the setting from relative to absolute; to switch it you need to
send the :TRIGger[:SEQuence]:RFBurst:LEVel:TYPE command, below.
Amplitude Corrections are not taken into account by the Absolute Trigger Level. For example, if you
have given yourself effective gain with an amplitude correction factor, the Absolute Trigger will not
fire until you have set the trigger level that far below the displayed signal level, rather than simply to
the displayed signal level. This is only true for Amplitude Corrections, not External Gain or Ref Level
Offset functions.
If mode is Bluetooth, the default value is –50 dBm.
Couplings This same level is used for the RF Burst trigger source in the Trigger menu, for the RF Burst selection
in the Periodic Timer sync source (in the Trigger menu and in the Gate Source menu), and also for the
1592 W-CDMA & HSPA Measurement Applications Reference