DA-TYPE SOCKET
ASSEMBLIES
C7246 SERIES
DEC. 2000
The C7246 series is a DA type socket assembly designed for 28 mm (1-1/8 inch) diameter side-on and head-on
photomultiplier tubes. The C7246 series socket assembly incorporates a voltage-divider circuit and a current-to-voltage
conversion circuit along with an amplifier that has a narrow but practical bandwidth (0 kHz to 20 kHz) to improve the
effective S/N ratio.
The C7246 series converts the low-level, high-impedance current of a photomultiplier tube into a low-impedance
voltage output by a factor of 0.3 V/
A.
Since the C7246 series employs an active voltage-divider circuit, it ensures an excellent DC linearity at low power
consumption and a gain adjustment function that does not affect the frequency bandwidth of the amplifier.
FEATURES
SPECIFICATIONS
Low power consumption
Low offset voltage
Adjustable gain function
Compact and light weight
MAXIMUM RATINGS
Parameter
Parameter
Value
Unit
Parameter
Unit
C7246
Unit
Input Voltage for Amplifier
12 to
15
a
V dc
Applicable Photomultiplier Tubes
Input Current for Amplifier (at
15 V)
Recommended Supply Voltage for Divider
b
Divider Current (at HV=-1000 V, VR=MIN)
c
Current to Voltage Conversion Factor
Maximum Input Signal Current
(at 10 V output, HV=-1000 V with no load resistor)
Frequency Bandwidth (-3 dB)
Output Impedance
Offset Voltage
Output Noise Voltage
Adjustable Gain Range
Total Power Consumption (at
15 V, HV=-1000 V, VR=MIN)
Weight
28 mm Dia. Head-on
R374, R2228, R5929, R6095, etc
530
A Typ.
V dc
A Typ.
-300 to -1000
211
-400 to -1000
174
0.3
V/
A
10
V
0.9
V
33
A
33
DC
Pulse
A
0 Hz to 20 kHz
mV Max.
mV rms. Typ.
dB Min.
30
10
mW Typ.
g Typ.
227
50
190
55
50
0.3
0.09
C7246-01
C7246
C7246-01
28 mm Dia. Side-on
R928, R3788, R3896, R4220, etc
GENERAL
Input Voltage for Amplifier
18
V dc
Supply Voltage for Divider
Operating Temperature
Storage Temperature
-1500
V dc
0 to +40
C
-15 to +60
C
a
To be also practicable even with
5 V of input supply voltage except for narrow output range (2 V max).
b
Use more than 600 V at negative high voltage input from view-points of output linearity, when giving more than 10
A at signal input (anode out).
c
"VR = MIN." means that the PMT gain is set to minimum gain.
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are
subject to change without notice. No patent rights are granted to any of the circuits described herein. 2000 Hamamatsu Photonics K.K
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Maximum Output Voltage (with no load resistor)
Output Voltage (with 50
load resistor)
PATENT
DA-TYPE SOCKET ASSEMBLIES C7246 SERIES
TACCC0103EC
Figure 1. Schematic Diagram
Figure 2. Frequency Response of Built-in Amplifier
TACCB0046EB
K
-HV
C2
C1
DY1 DY2 DY3 DY4 DY5 DY6 DY7 DY8
DY9
DY10
DY11
C1, C2: 0.01
F
C3: 0.022
F
C4: 0.047
F
* PATENT
C3
C4
SIGNAL OUTPUT
AMP
P
50
TRANSISTOR
CIRCUIT
* GAIN ADJ. CIRCUIT
VR = 5 M
0.1
1000
1
-20
5
-3dB
-5
0
-10
-15
FREQUENCY (kHz)
RELATIVE GAIN (dB)
10
10
100
TACCA0175ED
Figure 3. Dimensional Outline (Unit: mm)
GAIN ADJ.
POT (VR)
450 10
7
33.0 0.5
HOUSING
(METAL)
25.6
31.7 0.3
1)
1)
38.0 0.3
5
3.5
450 10
33.0 0.5
4.7
HOUSING
(METAL)
33.0 0.3
29.0 0.3
49.0 0.3
GAIN ADJ.
POT (VR)
C7246
C7246-01
31.7 0.3
-HV
SIGNAL OUTPUT
15 V
SHIELD CABLE 2)
COAX RG-174/U
SHIELDED CABLE (COVERING TWISTED PAIR) 3)
RED
BLACK
GRAY
NOTES: 1) Turning this pot clockwise increases the PMT gain. (25 turns max.)
2) At the end of HV cable, it's possible to attach SHV connector fitting RG-174/U.
3) Connect as follows.
Orange Lead
+15 V
White Lead
-15 V
Shield
GND
TACC1015E04
DEC. 2000 IP
Printed in Japan (500)
*
PATENT: JAPAN 1 [No.2963393], USA 1 [No.5880457]
DA-TYPE SOCKET ASSEMBLIES C7246 SERIES
OPTIONS
q
HOUSING E7718 FOR C7246 (INCLUDING PART #
1
,
2
,
4
AND
5
) (Unit: mm)
q
FLANGE SET A7709 FOR C7246-01 (INCLUDING PART #
1
,
4
,
5
,
6
,
8
AND
!0
) (Unit: mm)
TACCA0196EA
TACCA0195EA
3
1.5
10.2
54
132
1
2
3
4
5
6
HOUSING
MAGNETIC SHIELD CASE
PMT
O-RINGS
4-M2 SCREWS L = 6
C7246
[SUGGESTED FIXTURE LAYOUT FOR THE FLANGE]
[HOW TO USE THE HOUSING WITH FLANGE]
* THE FLANGE AND O-RING ARE AVAILABLE TO ORDER SEPARATELY AS P/N; A7719.
54 0.1
43
M42 P = 1.5
(FOR FIXING)
4-M3
FLANGE *
* O-RING
26
42
46
60
1
2
4
5
6
3
1
2
3
4
5
6
7
8
9
!0
INSULATOR (CUSHION)
PMT
E989 MAGNETIC SHIELD CASE
CLAMPING METAL PARTS
2-M3 SCREWS L = 5
FLANGE
C7246-01
O-RING
FIXTURE
2-M3 SCREWS L = 5
[SUGGESTED FIXTURE LAYOUT FOR THE FLANGE]
5
80 2
54 0.1
48
3-M3
54
60
35.2 1
9
8
!0
6
5
4
3
2
1
7
120
120
DIRECTION OF INCIDENT LIGHT
HAMAMATSU PHOTONICS K.K., Electron Tube Center
314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P. O. Box 6910, Bridgewater. N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218 E-mail: usa@hamamatsu.com
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658 E-mail: info@hamamatsu.de
France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10 E-mail: infos@hamamatsu.fr
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road Welwyn Garden City Hertfordshire AL7 1BW, United Kingdom, Telephone: 44-(0)1707-294888, Fax: 44(0)1707-325777 E-mail: info@hamamatsu.co.uk
North Europe: Hamamatsu Photonics Norden AB: Smidesvgen 12, SE-171-41 SOLNA, Sweden, Telephone: (46)8-509-031-00, Fax: (46)8-509-031-01 E-mail: info@hamamatsu.se
Italy: Hamamatsu Photonics Italia: S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39)02-935 81 733, Fax: (39)02-935 81 741 E-mail: info@hamamatsu.it
HOMEPAGE URL http://www.hamamatsu.com
PDF 
ZIP