Octopus Tester

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Features

  • Classic Octopus Tester
  • Scope set to X-Y for voltage-vs-current measurement of part
    • Look at scope pattern for device signature
  • Out of circuit component tester
    • Useful for matching parts like diodes
  • In circuit component tester
    • Test 2 units and compare signatures on scope
  • Use 6.3V "filament" transformer
    • 8.91V - Vpeak
    • 17.82V - Vpeak-peak
  • 1mA, 10mA "scale" switch
    • Pot adjustments to set current (accommodate transformer and line voltage variances)
  • 2 BNC jacks
    • Timebase = XY
    • Connect to XY on scope (X=CH1, Y=CH2)
    • CH2 gets set to INVERT
  • Plus, Minus Banana jacks
  • AC powered
    • C13 jack with switch
    • 1A Fuse
  • Build into Bud Box CU-1945

X-Y Patterns

XY Patterns.PNG

Resistors

  • Resistor - slope line
    • Slope = resistance value
  • 1 mA setting = 8901 ohms
  • 10 mA setting = 890 ohms

Capacitors

  • Oval shape
  • 0.47uF, 60 Hz = 5643 ohms
  • 1uF, 60 Hz = 2652 ohms
  • 3.3uF, 60 Hz = 803 ohms

OctopusTester Cap 1uF-01.png

OctopusTester Cap 1uF-02.png

Schematics

OctopusTester SCHEM.PNG

  • Adjust RV2/RV2 for total resistance (fixed resistor plus pot)
    • 891 - 1 mA switch setting
    • 8910 - 10mA switch setting

Videos

Build

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Cutouts on Bud Box CU-1945

OctopusTester FRONT-BACK.PNG