• Country
• United States of America (USA)

• Manufacturer / Brand
• 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.

• 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.

• Other Models

• Here you find 148 models, 131 with images and 60 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Simpson Electric Co.; Chicago, IL - Lac du Flambeau, WI