FAST-PS-M – User’s Manual
21
Trigger Input
An input that allows the FAST-PS-M to be triggered is provided on the rear
panel on a BNC connector on the “B” socket. This input is labelled as “TRG IN”.
This input accepts TTL (5V) and LVTTL (3.3V) compatible signals and should
be driven by a low-impedance source or generator.
The logic levels are subject to a hysteresis that allows for this recognized values
that guarantee correct operation of the trigger as listed in
Table 3
:
Logic Level
Value
Low-to-HIGH
> 2.2 V
High-to-LOW
< 0.7 V
Table 3:
Trigger Logic Levels
The absolute maximum rating for the Trigger Input signal is of
5.5 V
(a higher
voltage level applied to this input can seriously damage the device).
A visual representation of the voltage levels for the trigger operation is
presented in the following
Figure 11
:
Figure 11:
Trigger Thresholds
0
1
2
3
4
5
6
Trigger Input
HIGH LEVEL
LOW LEVEL
ABSOLUTE MAXIMUM
Trigger Signal
