ZM1240

Gas-filled cold-cathode side-view numerical display showing digits 0–9 with a right decimal point and 16 mm characters. Siemens data specify approximately 170 V ignition and 145 V normal glow voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

The ZM1240 is a gas-filled cold-cathode Nixie display tube. The catalog shows 0 to 9 with right decimal point with a side viewing arrangement and a character height of 16.0 mm. Its ignition voltage is 170 V, extinction voltage is about 120 V, and normal glow voltage is about 145 V. The source is French-language material translated to English for this record.

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

Nixie

X-ray radiationInterelectrode capacitances

Regulator minimum current: 1.5 A
Regulator maximum current: 3 A
Regulator starting voltage: 170 V
Regulator maintaining voltage: 145 V

Single cold-cathode display section. Ignition, sustaining/extinction voltages, cathode-current limits, and display/mechanical data are retained below.

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

1973 Nixie Siemens

Published operating points and test conditions from this source.

SECTION 1

Nixie

Characteristics

Ignition voltage
170 V
Maximum/typical threshold shown in source table
Operating glow voltage
145 V
Approximate service voltage
Extinction voltage
120 V
Source table value
Nominal cathode current
2.2 mA
Main symbol/digit
Nominal decimal-point cathode current
0.3 mA
Decimal point

Other

Maximum supply voltage
170 V
Absolute limit table
Cathode current
1.5 to 3 mA
Main symbol/digit continuous range
Decimal-point cathode current
0.2 to 0.4 mA
Decimal point continuous range
Maximum peak cathode current
3.5 mA
Main symbol/digit
Maximum peak decimal-point cathode current
0.6 mA
Decimal point
Envelope temperature minimum
-20 degC
Operating envelope temperature range
Envelope temperature maximum
70 degC
Operating envelope temperature range
Display characters
0 to 9 with right decimal point
Translated from French source
Display orientation
side
Viewing orientation
Character height
16 mm
Display geometry
Maximum tube height
48 mm
Mechanical dimension
Maximum tube width/diameter
19 mm
Mechanical dimension as printed