PMT2100 Series Photomultiplier Tubes
Chapter 10: Specifications
Rev D, June 6, 2019
Page 35
10.2. PMT Specifications
Specification
Value
PMT Type
Hamamatsu GaAsP
H10770PA-40
Cooling
Non-Cooled
Photocathode Geometry
Head On
Window
Borosilicate, Flat Window
Spectral Response
300 - 720 nm
PMT Gain (Max)
>1.0 x 10
6
Supply Adjustable Range (Relative Sensitivity, Gain
Control)
1:50
Ripple Noise
0.6 mV
Settling Time of Sensitivity Control
1
0.2 s
Photocathode Active Area
Ø5 mm
Peak Wavelength
580 nm
Cathode Radiant Sensitivity
At 420 nm
108 mA/W (Typical)
At 550 nm
176 mA/W (Typical)
Dark Count
2,3
Typical
6000 s
-1
Maximum
18000 s
-1
Warm-Up Time Before Control Voltage
4
30 to 60 minutes
Induced Ripple in Signal
5
0.6 mV
pp
(Max)
Anode Pulse Rise Time
6
1.00 ns
Anode Current (Max)
7
500 µA
Protection Circuit
50 µA
Control Voltage Range
+0.50 to +1.0 V
Recommended Control Voltage Range Vcontrol
+0.50 to +0.80 V
Input Impedance: 100 kΩ
1
Stabilized time in the control voltage adjustment from +1.0 V to +0.5 V.
2
After 30 min Storage in Darkness
3
Control Voltage: Plateau ; Temperature Control at 25 °C
4
The dark count rate specification is valid when the PMT has been turned on in the dark, no control
voltage has been applied during the specified warm-up time, and no signal has been incident during the
specified warm-up time.
5
Measured across 1 M
Ω / 22 pF Load
6
Control Voltage: +0.8 V; Temperature Control at 25 °C
7
Exceeding the maximum anode current will irreparably damage the PMT. The PMT must be shielded
from ambient light and the control voltage must be carefully chosen so that unexpected signal spikes do
not cause the anode current to be exceeded.
