• Country
• Japan

• Manufacturer / Brand
• Sanwa Electric Instrument Co., Ltd.; Tokyo

• Year
• 1972 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 362691

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

• Number of Transistors
• 3

• Semiconductors
• 2SC550 2SB476 2SK34 unknown_IC

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / C: 3 x 1.5 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Earth Resistance Meter PDR-100 - Sanwa Electric Instrument Co.,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Notes

• Sanwa Electric Instrument Co., Ltd.; Earth Tester PDR-100

  • Ω (earth R): 0-10, 0-100, 0-1000
  • ACV (leakage): 0-30

  In the diagram, TR1 appears represented as PNP but named as 2SC550 (NPN).

• Literature/Schematics (1)
• -- Original-techn. papers.

• Author
• Model page created by Miguel Bravo-Cos. See "Data change" for further contributors.

• Other Models

• Here you find 88 models, 79 with images and 46 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sanwa Electric Instrument Co., Ltd.; Tokyo