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Frequency-Period Meter 9520

Frequency-Period Meter 9520; Racal Engineering (ID = 1500388) Equipment
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Frequency-Period Meter 9520; Racal Engineering (ID = 1500388) Equipment
Racal Engineering: Frequency-Period Meter 9520 [Equipment] ID = 1500388 863x663
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For model Frequency-Period Meter 9520, Racal Engineering (Racal Instruments) Ltd., Bracknell
Country:  Great Britain (UK)
Manufacturer / Brand:  Racal Engineering (Racal Instruments) Ltd., Bracknell
Year: 1980 ?? Category: Service- or Lab Equipment
Valves / Tubes 4: GN13A GN13A GN13A GN13A
Semiconductors (the count is only for transistors) Semiconductors present.
Wave bands - without
Power type and voltage Alternating Current supply (AC)
Loudspeaker - - No sound reproduction output.
Power out
from Model: Frequency-Period Meter 9520 - Racal Engineering Racal
Material Metal case
Shape Tablemodel without bush buttons, Mantel/Midget/Compact up to 14

Measures Frequency or Period with four ranges

Frequency:   x1, x10 ,x100 ,x1000 Hz
Period:    x0,1, x1, x10, x100 μs

The test button delivers a 1000 Hz signal derived from the internal frequency reference to the counter.

Four digit Nixie tube display. Each digit is a separate module with:

  •     A ITT GN13A nixie tube,
  •     Mullard  FJJ131 (7490) decade counter,
  •     Mullard FJH141 (7400) quad NAND port,
  •     10 off ZTH342 transistors to drive the cathodes,
  •     A BC109 transistor, a silicon diode and some resistors.

About 4 to 6 transistors and many ICs on main board so about 50 transistors. Reference crystal in glass bulb.

Aluminimum carrying handle but AC mains only.

Model page created by Josep Garcia-Menchon. See "Data change" for further contributors.

All listed radios etc. from Racal Engineering (Racal Instruments) Ltd., Bracknell
Here you find 105 models, 50 with images and 11 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.