Keysight E6640A, Measurement Applications User & Programmer Reference

Page: 1585 / 2870

11 Occupied Bandwidth Measurement
Sweep/Control
Period
Sets the period of the internal periodic timer clock. For digital communications signals, this is usually set to
the frame period of your current input signal. In the case that sync source is not set to OFF, and the
external sync source rate is changed for some reason, the periodic timer is synchronized at the every
external synchronization pulse by resetting the internal state of the timer circuit.
Key Path
Trigger, Periodic Timer
Remote Command
:TRIGger[:SEQuence]:FRAMe:PERiod <time>
:TRIGger[:SEQuence]:FRAMe:PERiod?
Example TRIG:FRAM:PER 100 ms
Dependencies The invalid data indicator turns on when the period is changed, until the next sweep/measurement
completes.
Couplings The same period is used in the Gate Source selection of the period timer.
Preset 20 ms
GSM: 4.615383
State Saved Saved in instrument state
Min 100.000 ns
Max 559.0000 ms
Default Unit S
Initial S/W Revision Prior to A.02.00
Offset
Adjusts the accumulated offset between the periodic timer events and the trigger event. Adjusting the
accumulated offset is different than setting an offset, and requires explanation.
The periodic timer is usually not synchronized with any external events, so the timing of its output events
has no absolute meaning. Since the timing relative to external events (RF signals) is important, you need to
be able to adjust (offset) it. However, you have no direct way to see when the periodic timer events occur.
All that you can see is the trigger timing. When you want to adjust the trigger timing, you will be changing
the internal offset between the periodic timer events and the trigger event. Because the absolute value of
W-CDMA & HSPA Measurement Applications Reference 1585