Addendum: Phosphorimeter Trigger v. 1.0 (13 Aug 2003)
1
Note:
All inputs are active low; all digital outputs are active low.
Warning:
Do not connect
pin 1 to pin 3.
Addendum: Phosphorimeter
Trigger
Introduction
There are two important pins to consider: Pin 5 is for the flash lamp, which provides a
12.8-µs pulse, active LOW. The acquisition delay starts on the HIGH
→
LOW transition
(< 10 ns jitter). Pin 4 is the phosphorimeter trigger input, which requires a minimum
pulse-width of 200 ns. Acquisition begins at 250 to 350 ns after the HIGH
→
LOW
transition. Any pulses received when the board is not ready for them are ignored. The
time between pulses should be at least 1 µs longer than the interval between pulses set
in the DataMax software.
Pin connections
Below is a table of connector pins and their use.
Pin #
Signal
I/O
1
Output opto power
(5 V)
6
Disable CW xenon lamp (active LOW)
O
2
Enable phosphorimeter-mirror position (active LOW)
O
7 Valid
phosphorimeter-mirror position (active LOW)
I
3
Input opto power
(5 V)
8
Status 1 (reserved for future use)
I
4
Trigger phosphorimeter cycle (on HIGH
→
LOW transition)
I
9
Status 2 (reserved for future use)
I
5
Flash phosphorimeter lamp (on HIGH
→
LOW transition)
O