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/

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

SPECIFICATIONS

MAXIMUM RATINGS

Parameter

Parameter

Value

Unit

Parameter

Unit

C7246

Unit

Input Voltage for Amplifier

V dc

Applicable Photomultiplier Tubes

Input Current for Amplifier (at

±15 V)

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

µA Typ.

V dc

µA Typ.

-300 to -1000

211

-400 to -1000

174

0.3

V/

µA

10

V

0.9

V

33

µA

33

DC

Pulse

µA

0 Hz to 20 kHz

–

Ω

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

µA 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

Ω load resistor)

PATENT