FZ21V

Blue-sensitive high-vacuum photoelectric cell using a caesium-antimony photocathode. It provides stable direct photoelectric detection of blue and visible light without gas multiplication.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Blue-sensitive high-vacuum photoelectric cell with caesium-antimony cathode.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
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 cathode current: 0.01 mA

Photocell section; maximum average photocathode current promoted to MaxCathodeCurrent.

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

1953 AEG

Published operating points and test conditions from this source.

SECTION 1

PhotoemissiveDetector

Other

Operating voltage maximum
250 V
Intermittent short-on operation
Cathode current crest maximum
30 uA
Entire cathode surface illuminated
Cathode current average maximum
10 uA
Entire cathode surface illuminated
Cathode surface area
6.5 cm2
Ambient temperature maximum
50 degC

Capacitance

Cell capacitance
1.5 pF

Characteristic

Spectral sensitivity maximum wavelength
400 nm