RARE Vintage soviet USSR Vacuum tube output power level indicator IVLSHU1-11/2

meter bargraph FG28SB1 nixie recording level

condition NOS - not used

The two-signal level bar indicator is designed for
work in high-quality household sound-amplifying equipment.

The indicator board consists of two lines with 11 elements of green (8) and red (3) light in each. The signal level is additionally indicated by digitization in decibel units. Digitization of the switched on indicator shines constantly, and the number of luminous elements in the rulers depends on the level of the monitored AF signal. The device is produced in two modifications, differing in that one board needs to be placed horizontally in the apparatus, and the other - vertically. In addition, devices with scales are produced, where the last 3 elements are not fully illuminated, but only along the perimeter of the sign.

Main characteristics:
Luminescence brightness, cd / m2, not less, anodes-elements
green glow --- 250
red glow --- 70
Luminescence brightness, cd / m2, not less, at the end of the guaranteed operating time for element anodes
green light --- 125
red glow --- 35
Contrast,%, not less --- 60
Viewing angle, deg., Not less than --- 40
Information field dimensions, mm --- 54x17
The number of controlled anodes-elements --- 23
Rated voltage of the cathode filament, V --- 2.4
Voltage at the anodes-elements, V --- 27 ... 33
Filament current of the cathode, mA
limit values ​​--- 140 ... 170
nominal value --- 160
The number of heat switchings, not less than --- 104
Ready time after switching on, s, no more --- 0.1
Guaranteed operating time, h, not less than --- 30,000
Working range of ambient temperature, ° С --- / - 45 ... + 40

Main characteristics of the built-in microcircuit:
Supply voltage, V --- 27 ...- 33
Voltage between cathode and common wire, V
(The difference between the supply voltage of the control chip and
voltage cathode - common terminal should not be less than 3 V) --- 24 ...- 30
Channel select signal voltage B, for level
high, not less than --- 1
low, no more than --- 9
Voltage at inputs 1 and 2 of control, V --- 0 ...- 8
Leakage current, μA, not more,
at the switch input --- 5
by analog inputs --- 10

Limit values ​​of parameters:
Cathode glow voltage, V --- 2 ... 2.65
The largest negative supply voltage of the built-in microcircuit, V --- 38
The largest negative voltage between the cathode and the common wire, V --- 30
The largest negative voltage at the control inputs 1 and 2, V --- 14

It is recommended to fix indicators in the equipment by gluing the balloon
to the edges of the cutout in the false panel for the dimensions of the board with Elastosil glue.
Mechanical attachment or attachment to leads soldered on the board is not allowed.
Any position of the indicator during operation.

Foreign counterpart - FG28SB1.

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