FUNDAMENTAL OPERATING PROCEDURE

TPMHA0348ED

TPMHC0090EC

TPMHC0096EA

PHOTOCATHODE

SHV-R CONNECTOR

-HV INPUT

SMA-R CONNECTOR

ANODE OUTPUT

SMA-R CONNECTOR

GATE PULSE INPUT

4.6

± 0.1

7.9

7

WINDOW

FACE PLATE

EFFECTIVE

PHOTOCATHODE

DIAMETER

10 MIN.

3.0

± 0.2

53.8

± 0.3

71.5

± 0.3

1) A general set-up for R5916U-50 is shown at right.

This is to perform a photon counting with gating function

and to detect weak light generated from the samples by the

laser excitation.

2) The pulse generator used in this set-up produce an output

having +10 V in height and adjustable width which you re-

quire. It also produces a trigger signal synchronyzing an

output pulse to the laser output. The R5916U-50 is in gate

off mode in the beginning to prevent unwanted signals

caused by the laser light or some scattered light which may

strike the photocathode directly.

3) The pulse generator required for gating function is very

simple. The required specifications for the pulse generator

is as follows:

a. Output voltage is +10 V to +15 V.

b. Pulse width is just what you require (between 5 ns and

10 ms).

LASER

EMISSIONS

HIGH VOLTAGE

POWER SUPPLY

C4840

PULSE

GENERATOR

R5916U-50

COUNTER

DISCRI-

MINATOR

AMP

C5594

SAMPLE

OUTPUT FOR GATING

TRIGGER

OUTPUT

6 M

Ω

24 M

Ω

12 M

Ω

33 k

Ω

100 k

Ω

330 pF

1000 pF

1000 pF

450 pF

330 pF

330 pF

10 k

Ω

GND

GND

MCP

ANODE

ANODE OUTPUT

SMA-R

CATHODE

50

Ω

-HV

SHV-R

GATE SIGNAL

INPUT SMA-R

Some of the values indicated in this circuit may be different from

actual values to meet the specifications.

GATE

330 pF