Oscilloscope OS-615S

Hung Chang Co. Ltd., Protek; Seoul

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  • Year
  • 1984
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 350957

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

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • Line / Batteries (any type) / DC: 12 / 11-30, 90-130, 180-260 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Oscilloscope OS-615S - Hung Chang Co. Ltd., Protek;
  • Dimensions (WHD)
  • 223 x 113 x 298 mm / 8.8 x 4.4 x 11.7 inch
  • Notes

  • 15 MHz Dual Trace Oscilloscope

    Vertical: 2 mV/Div - 10 V/Div 
    Horizontal: 0.5 µS/Div - 5 S/Div

    Also offered in Australia under different "Store Brands". All had the same model designation, OS-615S.

    Servicing Hints:

    The weak point in this machine is the original NiCad batteries. After nearly 4 decades these have failed or become unreliable unless they have been replaced. NiMh types can be substituted and the batteries are carried in a removable section of the back panel. The pack can be replaced without soldering.

    A faulty battery pack caused the Current Limiting (R5 10Ω 1W) resistor to overheat and damage the power supply circuit board.

    The wide power supply voltages can be understood when the Power Supply unit has three Voltage Regulator ICs and 5 Zener Diodes incorporated. A pack of three Lithium batteries can be connected to the 'scope via the back panel and the scope is thus truly portable.

    The 12 V power is DC only and the other supply must be AC.

    There are a dozen ICs in total and 24 transistors on three Circuit Boards.

    The change from 110 volts to 240 (nominal) is accomplished with a slide switch but this is not referenced in the set-up instructions. The switch is visible once the cover is removed and is shown in both the Power Supply Layout Diagram and that Schematic.

    Access to the circuit boards requires that the 'scope be disassembled, but fortunately, the boards and the CRT are connected with plug-and-sockets.

  • Net weight (2.2 lb = 1 kg)
  • 4.5 kg / 9 lb 14.6 oz (9.912 lb)
  • Mentioned in
  • - - Manufacturers Literature (Model OS-615S Instruction Manual.)
  • Literature/Schematics (1)
  • - - Manufacturers Literature
  • Literature/Schematics (2)
  • - - Manufacturers Literature
  • Author
  • Model page created by Brian Wilson. See "Data change" for further contributors.

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The model Oscilloscope is part of the collections of the following members.

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