8 Trigger
8.1 Trigger
4.8GHz ADC sampling rate for 255 ~ 2 GHz IF Paths, and within one sample
count of the 10.2GHz sampling rate for the 4 GHz IF Path
–
For all other instruments, available only if Option H1G is installed. It is only
available when the 1 GHz path is chosen, either directly or indirectly; in all other
paths it is visible but grayed-out. Direct and indirect selection of the 1 GHz path
occurs as follows:
–
Direct: Measurements that directly support the 1 GHz path have a 1 GHz
selection in the IF Path menu in Meas Setup
–
Indirect: Certain measurements, such as Power Statistics CCDF (PST), always
choose the widest available path, and so will choose the 1 GHz path if it is
available, even if there is no IF Path menu for the measurement. External 3
will be visible when this results in the 1 GHz path being selected, even if
there is no control or readout indicating that the 1 GHz path has been
selected
For a full list of Modes and measurements that support External 3, see "External 3
Support" on page 2636 in the section "Select Trig Source" on page 2633.
When External 3 is set, and then becomes disabled because you switched away
from the 1 GHz path, the Trigger Source selection reverts to the default ("Free Run"
on page 2646).
When External 3 Trigger is selected, the Trigger tab displays the following Trigger
Source dependent controls:
–
"Prot Frame Aligned" on page 2660
–
"Trigger Delay" on page 2663
–
"Trigger Slope" on page 2667
Additional controls are also present that are not dependent on the selected Trigger
Source.
Example
:TRIG:SPEC:SOUR EXT3
Sets External 3 as the trigger source for the Complex Spectrum measurement
Annunciation External 3 (in the Meas Bar)
8.1.1.8 Audio External
When Audio External is selected, a new sweep/measurement starts when the
external trigger condition is met using the TRIG IN input connector on the front
panel of the M9260A Audio Analyzer module. This is a TTL level input (not analog)
that supports both rising edge and falling edge triggers.
Spectrum Analyzer Mode User's &Programmer's Reference 2650