To eliminate the need for voltage divider network fabrication by the equipment designer, BURLE provides two types of integrated photomultiplier assemblies (IPAs) containing voltage divider networks. One type is a standard arrangement (Code 1), providing a standardized voltage divider distribution as seen in the Voltage Divider Distribution Table. The other type is a "tapered" divider, (Code 2), providing a voltage distribution appropriate for use in pulsed mode when high anode currents are required. In addition, both positive and negative high voltage configurations are available with both the tapered and non-tapered dividers. All of the IPAs feature large-area head-on photomultiplier active areas (round, square, or hex) useful in applications requiring measurement of light emissions from an extended area source. The photomultiplier tubes used in the IPAs are eight or ten dynode stage devices useful in general scintillation-counting applications and in the detection and measurement of low-light level events in the blue region of the spectrum. Typical Performance Characteristics Basic PMT Type Faceplate Anode Dark I (na) Gain @ 800V Filtered Responsivity (A/inc L) S83049F 3" Round 1.0 1.3 x 105 1.4 S83054F 2" Round 3.0 1.9 x 105 2.0 S83056F 3" Hex 15.0 1.4 x 105 1.5 S83079E 3" Square 15.0 2.1 x 105 2.4 C31016H 1" Round 0.1 1.0 x 104 1.5 Mechanically, the IPA consists of a photomultiplier tube, a printed circuit board supported at the tube base by an insulating stand-off, a shrink tube sleeve enclosing the circumference of the tube and a vinyl cap enclosing the tube base. Note that the assembly provides for both exclusion of stray light and electrical isolation of the photocathode from ground potentials in the instance of a positive ground system. Caution: Photocathode damage may occur and shock hazards to user may be present if the shrink sleeve is compromised. User is advised to use extreme caution and avoid physical contact with any portion of the IPA when high voltage is applied.   top       Output Leads for All IPA Assemblies Lead Insulation Color Connects To Black Negative H.V. terminal Red Positive H.V. terminal Green Anode (output signal terminal) To energize a negative H.V. IPA, the user connects the negative H.V. terminal on the power supply to the black lead and the positive H.V. terminal to a grounded red lead. To energize a positive H.V. IPA, the user connects the positive H.V. terminal to the red lead and the negative H.V. terminal to a grounded black lead. Caution: Positive H.V. and negative H.V. IPAs cannot be converted by switching external grounding. The standard voltage divider arrangement along with the tapered arrangement provide, respectively, total currents of approximately 500 microamps @ 1000 volts and 350 microamps @ 1000 volts. Average values of anode current drawn from a tube should not exceed 1/10 of these values. (Peak values can, in applications involving pulsed operation, exceed this value. The user is advised to contact BURLE for assistance in determining limits specific to the application.) The maximum ambient operating range for these devices is -40ºC to +70ºC   top
Voltage Divider Network Assemblies1 Assembly Type Basic PMT Type Voltage Divider Distribution Code Maximum Applied Voltage to High Voltage Connector High Voltage Polarity2 83049 540 S83049F 1 1200 + 83049 541 S83049F 2 1500 + 83049 542 S83049F 1 1500 + 83049 550 S83049F 1 1200 - 83049 551 S83049F 2 1500 - 83054 540 S83054F 1 1200 + 83054 541 S83054F 2 1500 + 83054 550 S83054F 1 1200 - 83054 551 S83054F 2 1500 - 83056 540 S83056F 1 1200 + 83056 541 S83056F 2 1500 + 83056 550 S83056F 1 1200 - 83056 551 S83056F 2 1500 - 83079 540 S83079E 1 1200 + 83079 541 S83079E 2 1500 + 83079 550 S83079E 1 1200 - 83079 551 S83079E 2 1500 - 83092 500 C31016H 3 2000 + 83112 501 83112-100 1 1800 + 83112 502 83112-100 2 1800 + 1. Total Divider Chain R = 2.0 M for standard and 2.7 M for tapered. 2. + = Red lead to pos. H.V., Black lead to grounded neg. H.V. - = Black lead to neg. H.V., Red lead to grounded pos. H.V.   top	Click Here for Negative HV Configuration Voltage Divider Circuit Schematic   Click Here for Positive HV Configuration Voltage Divider Circuit Schematic
Voltage Divider Distribution (R = 200 K for each interdynode resistor) Code K FE Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 P Note 1 R R R R R R R R R R Standard Divider 2 R R R R R R 1.3R 1.5R 2R 3R Increased Peak Linear Anode Current   top

 

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