Boonton 4500B Peak Power Meter - Manual (Page 59)

Boonton 4500B RF Peak Power Analyzer
Getting Started 3-25
MENU ITEM EXERCISE
TRIG (continued)
Trig > Trig Mode
Press the Trig > Trig Mode menu key to switch between Auto Pk/Pk, Auto, Normal and Free Run.
In Auto mode, if no trigger signal is present that traverses the trigger level plus trigger hysteresis,
the timebase is triggered automatically after a prespecified timeout period.
The Auto Pk/Pk mode continually adjusts the trigger level based on the signal characteristics to
achieve synchronization. If this is not possible, it triggers the time base automatically after a
prespecified timeout period.
In the Normal mode, the timebase is triggered only when the trigger signal traverses the trigger
level plus trigger hysteresis.
The Free Run mode triggers the timebase continually without regard to the trigger signal. This
mode is used briefly to locate the baseline and signal at the fastest sweep speeds.
Note The convenient Auto Pk/Pk mode can be used for almost all signals.
Trig > Trig Source
Press the Trig > Trig Source menu key to toggle between CH 1, CH2, Ext Trig 1 and Ext TRIG 2.
The CH 2 and Ext Trig 2 selections will be activated only if the optional Channel 2 is installed.
The Ext Trig sources require an external signal connected to the corresponding input.
Trig > Trig Level
In the Auto Pk/Pk mode, the trigger level is set automatically. In the Auto mode and Normal mode
use any of the data entry controls to adjust the trigger level.
In the Free Run mode trigger level is not used. For CH 1 and CH2 (if installed) the trigger level is
expressed in the same units as the channel and is allowed to range over the specified trigger level
range of the sensor in use. For Ext Trig 1 and Ext Trig 2 (if installed) the trigger level range is
40 volts.
For this exercise, the calibrator pulse test signal is set to +5 dBm. Therefore, the trace will
disappear or become un-synchronized if the trigger level is set higher than +5 dBm in the Auto or
Normal modes.
Trig > Trig Slope
Press the Trig > Trig Slope menu key to toggle between rising edge triggering and falling edge
triggering. Note that in the Status parameter field at the top of the graph mode display the trigger
slope is indicated by the sign preceding the name of the trigger channel.