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

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