Agilent Technologies N9340A - Manual (Page 36)

3 System Setting
34 N9340A User’s Guide
Ext Input
Toggles the channel for external input between
Ref
and
Trig. Ref refers to a 10 MHz reference signal,
and
Trig refers to a TTL signal.
Key Access:
[SYS] > {Setting} > {Ext Input}
External Reference (Ref)
Use the external reference function as follows:
1 Input a 10 MHz signal to the EXT TRIG IN/REF IN
connector.
2 Press [SYS] > {Setting} > {Ext Input} > {Ref} to enable
the external reference signal input.
Then the analyzer will turn off its internal
reference.
External Trigger (Trig)
When use an external TTL signal for triggering
function, the analyzer will use the inner reference
as default.
Use the external trigger function as follows:
1 Press [SYS] > {Setting} > {Ext Input} > {Trig} to enable
the external TTL signal input.
2 Press [SPAN] > {Zero Span} to activate the Trigger
function.
3 Access the associated softkeys to select the
threshold of the trigger condition at the raised
edge (
Ext Rise) or the fallen edge (Ext Fall).
NOTE
The external Ref and Trig functions are not available at the
same time.
NOTE
The trace will halt in external trigger mode till the trigger
threshold is met or the free run function is activated.