Volt-Ohm-Milliammeter 270 Series 3 (270-3, 270RT)

Simpson Electric Co.; Chicago, IL - Lac du Flambeau, WI

  • Year
  • 1966 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 86023

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

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries / D: 1 x 1.5 & Z: 4 x 1.5 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Bakelite case
  • from Radiomuseum.org
  • Model: Volt-Ohm-Milliammeter 270 Series 3 - Simpson Electric Co.; Chicago,
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 165 x 235 x 120 mm / 6.5 x 9.3 x 4.7 inch
  • Notes
  • Rugged Volt-Ohm-Milliammeter with special calibration circuit, 4.5" meter.

    Measuring ranges:

    DC Volt (sensitivity 20,000 ohms per volt): 0 - 250 mV, 2.5, 10, 50, 250, 1000, 5000 V
    AC Volt (sensitivity 5,000 ohms per volt): 0 - 2.5, 10, 50, 250, 1000 V
    DC current: 0 - 50 µA, 1, 10, 100, 500 mA, 10 A
    DC resistance: Rx1 - 2000 ohms, Rx100 - 2 megohms, Rx1000 - 20 megohms
    AF output (with 0.1µf internal series capacitor): 0 - 2.5, 10, 50, 250 V
    Volume (0 dB = 1 mW @ 600 ohms): -20 to +10, -8 to +22, +6 to +36, +20 to +50 dB

    Two Germanium rectifiers, one varistor.

    Batteries: one large "D" cell (#2) and four smaller "Z" flashlight cells.

    Model 270RT with roll-top safety case.

  • Net weight (2.2 lb = 1 kg)
  • 2.3 kg / 5 lb 1.1 oz (5.066 lb)
  • Mentioned in
  • - - Manufacturers Literature (User Manual)
  • Author
  • Model page created by Alexander Küffer. See "Data change" for further contributors.

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