E989-04

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Product Specifications: E989-04 – PMT Voltage Divider Circuit

Category	Specification	Details / Notes
General Model Info	Product Code	E989-04
	Product Type	Low-Noise, High-Stability Voltage Divider Circuit
	Manufacturer	Hamamatsu Photonics
	Primary Use	Precision PMT biasing for applications requiring minimal gain drift and low noise.
Compatibility	Intended PMT Type	Head-on type PMTs (e.g., R3896, R9880U series)
	Socket Type	10-stage PMT with standard pin arrangement (e.g., 12-pin).
Electrical	Input Voltage (V~in~)	+900 V to +1500 V DC (Positive polarity)
	Output Signal	Anode output (Negative Pulse – typical for this design)
	Output Connector	BNC connector
	Divider Type	Precision, Low-Temperature-Coefficient Resistor Network. May include active regulation or Zener diodes on critical dynodes.
	Divider Ratio	Fixed, optimized for maximum gain stability.
	Polarity	Anode Grounded / Cathode at High Voltage
	Capacitive Decoupling	High-quality, stable capacitors on final dynodes.
Performance	Gain Stability	Excellent; < 0.1% per hour drift (after warm-up)
	Temperature Coefficient	Very Low; < 100 ppm/°C
	Rise Time	< 5 ns
	Maximum Average Anode Current	50 μA (Optimized for stability, not high current)
	Noise	Ultra-low noise design with optimized grounding.
Mechanical	Housing Material	Metal (for shielding and thermal mass)
	PMT Socket	Integrated, with pin guides and securing mechanism.
	High Voltage Input	SHV connector (Standard High Voltage)
	Signal Output	BNC connector
	Dimensions	Similar to other E989 bases, but may use metal casing.
	Shielding	Full metal housing and integrated μ-metal magnetic shield for the PMT.
Environmental	Operating Temperature	-10 °C to +50 °C
	Storage Temperature	-20 °C to +60 °C
	Humidity	Non-condensing