HAMAMATSU C7246-01, C7246 Datasheet

DA-TYPE SOCKET
ASSEMBLIES

DEC. 2000

C7246 SERIES

PATENT

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/ µA.
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

Low power consumption

•

Low offset voltage

•

Adjustable gain function

•

Compact and light weight

•

SPECIFICATIONS

Parameter

Applicable Photomultiplier Tubes

R374, R2228, R5929, R6095, etc

C7246

28 mm Dia. Head-on

MAXIMUM RATINGS

Parameter

Input Voltage for Amplifier
Supply Voltage for Divider
Operating Temperature
Storage Temperature

Value Unit

±18

-1500 V dc

0 to +40 ˚C

-15 to +60 ˚C

GENERAL

Parameter

Input Voltage for Amplifier
Input Current for Amplifier (at ±15 V)
Recommended Supply Voltage for Divider
Divider Current (at HV=-1000 V, VR=MIN)
Current to Voltage Conversion Factor
Maximum Output Voltage (with no load resistor)
Output Voltage (with 50 Ω load resistor)
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

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 µA at signal input (anode out).
c "VR = MIN." means that the PMT gain is set to minimum gain.

b

c

DC
Pulse µA

C7246 C7246-01

±12 to ±15

530 µA Typ.

-400 to -1000
174

0.3 V/µA
10 V

0.9 V
33 µA
33

0 Hz to 20 kHz

50

±0.3

0.09

190

55

C7246-01

28 mm Dia. Side-on

R928, R3788, R3896, R4220, etc

a

-300 to -1000
211

227

50

Unit

–
–

V dc

Unit

V dc

V dc

µA Typ.

–

Ω

mV Max.

mV rms. Typ.

dB Min.3010

mW Typ.

g Typ.

Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
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

DA-TYPE SOCKET ASSEMBLIES C7246 SERIES

Figure 1. Schematic Diagram

K

DY1 DY2 DY3 DY4 DY5 DY6 DY7 DY8 DY9 DY10 DY11

VR = 5 MΩ

* GAIN ADJ. CIRCUIT

-HV

Figure 2. Frequency Response of Built-in Amplifier

C2C1

C3 C4

TRANSISTOR

CIRCUIT

P

AMP

C1, C2: 0.01 µF
C3: 0.022 µF
C4: 0.047 µF

* PATENT

SIGNAL OUTPUT

50

Ω

TACCC0103EC

TACCB0046EB

10

5

0

-5

-10

RELATIVE GAIN (dB)

-15

-20

0.1 10001

-3dB

10 100

FREQUENCY (kHz)