photodetector module
PDM TTL series data sheet
1 description
Our new range of TTL photodetector modules is available
either in the cylindrical or rectangular format with a choice of
25mm and 30mm diameter PMT’s. The photomultiplierhigh voltage and discriminator threshold levels are pre-set
for optimum performance, enabling photon counting
operation simply by connecting to a +5V supply.
These modules have the facility to attach a light fibre guide(not supplied).

2 features
Pre-configured for optimum performance and ease of use
Wide dynamic range (up to 100Mcps)
Magnetic and electrostatic shielding
Lower cost options (rectangular types)
Spectral range options

3 photomultiplier options

Part number

spectralrange nm

PDM03-9107-TTL
PDM04-9111-TTL
PDM04-9113-TTL
PDM9107-CP-TTL
PDM9107-AP-TTL
PDM9111-CP-TTL
PDM9113-CP-TTL

280-630
280-630
280-850
280-630
280-630
280-630
280-850

5 dynamic range

active dark counts (cps)dia mmtypical

25
22
2225
25
22
22

100
100
3000
100
1001003000

N = n/(1-nT)
where: N is the true count rate (cps),
n is the measured count rate (cps),
T is the count rate correction factor (25 x 10-9s),
Using this correction, deviation from linearity is typically within+5% at 100Mcps.

4 characteristics

output pulse:
TTL high level (terminated)rise and fall time
pulse-pair resolution
dead-time
signal count rate:
without dead time correction
with dead time correction
output impedance
discriminator levelsupply voltage
supply current (@ 5V, no signal)
supply current(@ 5V, signal = 100Mcps)
for PDM9107-AP-TTL:
supply current (@ 5V, no signal)
supply current(@ 5V, signal = 100Mcps)
warm-up time
temperature (operating)temperature (storage)
humidity (non-condensing)

Extended dynamic range can be obtained by dead timecorrection to compensate for departure from linearity at highcount rates due to pulse pile-up. Dead time may be corrected
for, as follows:

unit

minV
ns
ns
ns

2.6cps
cps
Ω
mV
V
mA

4.5

typ

1.2
25
25

50-240

mA

120mA

80

mA
so
CoC%

180
5-40

100

max

30M
100M
5.5

155
60
93

output counts (x 106 cps)•••••

10correcteduncorrected

1110input counts (x 106 cps)

100

PDM TTL series data sheet
page 2

9 outline drawing (mm)6 dimensions
Part number

PDM03-9107-TTL
PDM04-9111-TTL
PDM04-9113-TTL
PDM9107-CP-TTL
PDM9107-AP-TTL
PDM9111-CP-TTL
PDM9113-CP-TTL

lengthmm
a150
155
110
110

width depth weightgmmmmde

diamm
b

heightmm
c33
33
33
33

102.5
36
50
275
56.5unit 32
min 48typ 142
max
56.5
32
48
142
210
210
210
210

cylindrical moduleb

photomultiplierMu-metal * casea

7 installation and operation
Each module is supplied with test data. Wherever possible,
installation should be carried out in subdued light. Exposure tostrong lights, particularly those containing a high UV content,
can result in a temporary increase in dark counts during
subsequent operation.
Remove the protective cap from the package. If necessary, thephotomultiplier window can be cleaned using a lens tissuemoistened with alcohol. Do not use any other solvent.

450 + 50

Mount the module and make power input and signal output
connections. The signal lead should be terminated into 50Ω. Do
not expose the photomultiplier photocathode to strong lightwhile the module is energised.
+5V red0V black
output (RG174)

8 warning
No attempt must be made to repair or dismantle this product.
High voltage used within the module may present an electric
shock hazard.
Operation beyond the maximum ratings, or reversal of the input
voltage may result in loss of performance or permanent damage
to the product.

rectangular modulemaxe0V black+5V redoutput (RG174)

c450 + 50unit

mintypMu-metal*case

0V black+5V red
output (RG174)

d4 holesM3 x 6.5 deepon 26 centres*Mu-metal is a registered trademark of Magnetic Shield Corporation

ET Enterprises Limited
45 Riverside Way
Uxbridge UB8 2YF
United Kingdom
tel: +44 (0) 1895 200880
fax: +44 (0) 1895 270873
e-mail: sales@et-enterprises.com
web site: www.et-enterprises.com

ADIT Electron Tubes
300 Crane Street
Sweetwater TX 79556 USA
tel: (325) 235 1418
toll free: (800) 399 4557
fax: (325) 235 2872
e-mail: sales@electrontubes.com
web site: www.electrontubes.com

an ISO 9001 and ISO 14001 registered company
The company reserves the right to modify these designs and specifications without notice.
Developmental devices are intended for evaluation and no obligation is assumed for future
manufacture. While every effort is made to ensure accuracy of published information thecompany cannot be held responsible for errors or consequences arising therefrom.

© ET Enterprises Ltd, 2017
DS_ PDM TTL series Issue 1 (18/05/17)