To Set The Trigger Delay; To Select The Synchronous Output - HP 86140A Series User Manual

Using the Optical Spectrum Analyzer
The Bandwidth/Sweep Menus

To set the trigger delay

1 Press the front-panel Bandwidth/Sweep key.
2 Press the More BW/Sweep Functions.... softkey.
3 Press the Trigger Delay softkey.
4 Use the knob, step keys or numeric entry pad to enter the desired value.
5 Use the Trigger Delay softkey to set the delay between the external trigger and
the triggering of the analog-to-digital converter.
The value you select is displayed in the Active Function Area.

To select the synchronous output

1 Press the front-panel Bandwidth/Sweep key.
2 Press the More BW/Sweep Functions.... softkey.
3 Press the Sync Out softkey until the desired output is selected.
The synchronous output allows external equipment to receive a sync signal at
each sample point of the OSA sweep. When
TTL LOW
specified, the signal will go
goes low when the analog-to-digital converter is triggered. The width of the
synchronous output pulse is equal to the trigger delay.
3-20
. When is selected, the signal will be a
HIGH
HIGH
is selected, the signal will be a
LOW
TTL HIGH
when the external trigger is recognized and
. When is
PULSE