3512

High-vacuum caesium-cathode photoelectric cell for direct light detection and measurement. Its photosensitive cathode produces a current proportional to incident illumination without an internal multiplication structure.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: 4
Nominal heater: -

Description

High-vacuum caesium-cathode photoelectric cell.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 4
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

PhotoemissiveDetector

X-ray radiationInterelectrode capacitances

Max plate voltage: 500 V
Max cathode current: 0.005 mA

Published Mullard/Ferranti ratings and characteristics promoted where applicable; additional electrical values retained as parameters.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

PhotoemissiveDetector

Construction

Photocathode / fill
High-vacuum caesium cathode

Other

Anode voltage maximum
500 V
Normal anode voltage
100 V
Anode current maximum
5 uA
Light flux maximum
0.1 lm

Characteristics

Sensitivity
20 uA/lm

Capacitance

Anode-cathode capacitance
3 pF

Application

Application
Photoelectric light detection

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

PhotoemissiveDetector

Characteristic

Anode voltage . . . . . . Va
100 V
Anode voltage . . . . . . Va = 100V
Sensitivity . . . . . . . . N
26 µA
Sensitivity . . . . . . . . N = 26 uA/lm
sensitivity is to light of
8500 A
sensitivity is to light of 8500 A wavelength; the cell is thus best fitted for working
lacquer which is impenetrable to light of shorter wavelength than
6000 A
lacquer which is impenetrable to light of shorter wavelength than 6000 A; this
is to say, a current of
1070 µA
is to say, a current of 1070 uA will flow when the cell is touched by a radiation
The illumination should be adjusted so that anode current never exceeds
5 pA
The illumination should be adjusted so that anode current never exceeds 5 pA;

Capacitance

Anode-to-cathode capacity. . Cak
3 pF
Anode-to-cathode capacity. . Cak = 3 pF

Other

Maximum anode voltage. . . Vamax
500 V
Maximum anode voltage. . . Vamax = 500 V
Maximum anode current . . . lamex
5 µA
Maximum anode current . . . lamex = 5 uA