horiba Phosphorimeter Trigger Installation and operating instructions

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 connec
t
p
in 1 to
p
in 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

Addendum: Phosphorimeter Trigger v. 1.0 (13 Aug 2003)
2
Typical circuitry
Input
A typical input circuit to the user trigger might look like this:
Output
A typical output circuit to the user trigger might look like this:
+5V (user supplied)
74HC or HCT logic
(or LS)
USER
270–470 Ω
USER
Input opto power
Data inputx
7 mA
470 Ω
SPECTRACQ USER I/O CONNECTOR
Pin 1
+5V
74FCT245
Pin 3
Data outputx
12 mA max
Output opto power
SPECTRACQ I/O USER CONNECTOR