Models LB480A/LB680A
USB Powe™
Product Manual PPA (Pulse Profiling Application)
Revision: 08/02/11
44
External TTL Trigger
The external TTL trigger mode requires the user to connect an external SMB cable with an incoming TTL signal. Use
this capability to trigger on an input that is not level dependent or for very low signal levels approaching the noise floor
of the sensor. See the
Averaging & Filters
Toolbar section for more information on measuring low level signals.
All trigger modes can use positive or negative
Edge
triggering as well as
Cont
(continuous) or
Sngl
(single) sweep.
The trigger
Delay
function (up to 10 msec) must be enabled/disabled from the delay window as shown below. The
standard LB480A power sensor has
External TTL
input/output connectors labeled TI/TO (SMB-male). See the trigger
limits in the specifications section of this document (or the LB480A data sheet) to employ the
External TTL
trigger
capability utilizing the trigger connectors on the sensor body.
NOTE:
An incoming pulse must be on at least 0.20 usec followed by at least 1 usec of off time for the sensor to
properly trigger.
