1362
Trigge r
Relative Trigger Level
Sets the relative trigger level for the RF burst envelope.
In some models, the relative burst trigger function is implemented in hardware. In other models, without
the advanced triggering hardware required, the relative burst trigger function is implemented in software
in some measurements, and is unavailable in other measurements.
When implemented in software, the relative RF Burst trigger function is implemented as follows:
1. The measurement starts with the absolute RF Burst trigger setting. If it cannot get a trigger with that
level, auto trigger fires and the acquisition starts anyway. After the acquisition, the measurement
searches for the peak in the acquired waveform and saves it.
2. Now, in the next cycle of the measurement, the measurement determines a new absolute RF Burst
level based on the peak value from the first measurement and the Relative RF Burst Trigger Level
(always 0 or negative dB) set by the user. The following formula is used:
absolute RF Burst level = peak level of the previous acquisition + relative RF Burst level
3. If the new absolute RF Burst level differs from the previous by more than 0.5 dB, the new level is
sent to the hardware; otherwise it is not updated (to avoid slowing down the acquisition)
Steps 2 and 3 repeat for subsequent measurements.
Example: TRIG:RFB:LEV:TYPE REL
sets the trigger level type of the RF burst trigger to Relative.
Preset: ABSolute
State Saved: Saved in instrument state
Initial S/W Revision: Prior to A.02.00
Modified at S/W Revision: A.04.00
Key Path: Trigger, RF Burst
Scope: Meas Global
Remote Command: :TRIGger[:SEQuence]:RFBurst:LEVel:RELative <rel_ampl>
:TRIGger[:SEQuence]:RFBurst:LEVel:RELative?
Example: TRIG:RFB:LEV:REL –10 dB
sets the trigger level of the RF burst envelope signal to the relative level of
–10 dB
Notes: Sending this command does not switch the setting from absolute to relative; to
switch it you need to send the :TRIGger[:SEQuence]:RFBurst:LEVel:TYPE
command, above.
The relative trigger level is not available in some measurements. In those
measurements the RELative parameter, and the
:TRIGger[:SEQuence]:RFBurst:LEVel:TYPE
command (above), will generate an error if sent.