
4System Setting
58 N9340A User’s Guide
Ext Input
Toggles the channel for external input between Ref
and Trig. Ref refers to a 10 MHz reference signal; 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.
The analyzer then turns off its internal reference.
External Trigger (Trig)
When an external TTL signal is used for triggering
function, the analyzer uses 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 Trig ger
function.
3 Access the associated softkeys to select the
rising edge (Ext Rise) or the falling edge (Ext Fall)
as the trigger threshold
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.
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