Frequency Counter PM6645 /01 /02 /03 /04 /05

• Country
• Sweden

• Manufacturer / Brand
• Philips, Svenska AB, Stockholm

• Year
• 1972 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 251764

• Picture
• Schematics

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Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 9

• Valves / Tubes
• ZM1005

• Number of Transistors
• 59

• Semiconductors
• BFW10 BFW92 BFR90 BFR91 BC107 BC177 BC109 BFX89 or. 2N2369 BFW11 BC108 BC178 2N2646 BFY50 BSX21 2N2905 2N3640 2N3055 OM171 OM152 OM110 CA3086 µA741 SN7451 SN7474 SN7405 SN7413 SN7400 SN7454 SN7490 SN74196 SN74176 SN7475 SN74141 µA723 FD700 FH1100 BA182 BAX13 BAW62 BYX10 BZX79 BZZ15 VH248

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 115; 230 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Frequency Counter PM6645 /01 /02 /03 /04 /05 - Philips, Svenska AB, Stockholm

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 320 x 135 x 410 mm / 12.6 x 5.3 x 16.1 inch

• Notes

• The frequency counter PM6645 enables direct counting of continuous-wave signals from 30Hz to 500MHz, at a 5mV sensitivity.

  An automatic gain control provides a wide dynamic range and enables measurement of signals with high-noise levels. This circuit also eliminates manual control settings and obviates risk of false counting due to noise. Designed particulary for "frequency only" measurements, the PM6645 will find its main application in the field of communications.

  A temperature-compensated crystal oscillator (TCXO) provides a high measurement stability that can be further improved by the optional high-stability oscillator PM9680 (proportionally controlled oven oscillator).

  All functions except the display time can be externally programmed by providing the counter with the optional remote control unit PM9683. Another optional accessory, the BCD output unit PM9682, provides a 4 line data output (code 8-4-2-1). Furthermore, a number of sub-units extends and improves the performance of the basic counter.

  Hybrid thin-film circuits, especially designed for the PM6645, and both standard and high-speed TTL integrated circuits form the major portion of the circuitry. Good serviceability is further ensured by the use of plug-in connections wherever possible.

  Input impedance: Switchable, 1MΩ shunted by ≈15pF or 50Ω
  Sensitivity: 5mV r.m.s. (600Hz...512MHz)
  Dynamic range: 5mV r.m.s. ... 5V r.m.s. (600Hz...512MHz)
  Display: 9 numerical indicators with automatically positioned decimal points (NIXIE)
  Oscillator (Time Base):
  TCXO 10MHz, average ageing rate ±8x10^-7/year, temperature stability ±1x10^-6
  OCXO 10MHz, average ageing rate ±1.5x10^-9/24h, temperature stability ±3x10^-8

  Each tube/solid state device is listed once only. The PM6645 contains also 51 integrated circuits (IC) and 3 Philips-made thin-film circuits.

  ---

  Frequenzimetro da 30Hz a 512MHz
  con sensibilità da 5mV rms a 5Vrms max. Ingresso selezionabile tra 50 Ohm (max.12V) e 1Mohm /15pF max 220V.

  Display a nixie 9 digit 

• Net weight (2.2 lb = 1 kg)
• 8.5 kg / 18 lb 11.6 oz (18.722 lb)

• Mentioned in
• -- Original-techn. papers.

• Literature/Schematics (1)
• Funk-Technik (FT) (15/1972, S.560, neu im Vertrieb d. Philips Elektronik Industrie GmbH, Hamburg)

• Author
• Model page created by Gilberto Verrini. See "Data change" for further contributors.

• Other Models

• Here you find 240 models, 220 with images and 109 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philips, Svenska AB, Stockholm