Octopus Tester

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Features[edit]

  • Classic Octopus Tester
  • 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
  • Plus, Minus Banana jacks
  • AC powered
    • C13 jack with switch
    • 1A Fuse

Scope Setup[edit]

  • Scope set to X-Y for voltage-vs-current measurement of part
    • Press button above time adjustment knob
    • Time Base XY
    • Look at scope pattern for device signature
    • Shows voltage/current phase relationships
    • 50 mS timebase
    • Connect to XY on scope (X=CH1, Y=CH2)
    • CH2 gets set to INVERT

Schematic and Values[edit]

OctopusTester SCHEM.PNG

  • Adjust RV1/RV2 for total resistance (fixed resistor plus pot)
    • 891 - 1 mA switch setting (RV2)
    • 8910 - 10mA switch setting (RV1)

X-Y Patterns[edit]

XY Patterns.PNG

Resistors[edit]

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

OctopusTester Resistor.png

Capacitors[edit]

  • Oval shape
  • 0.3uF, 60 Hz, 8841 ohms
  • 3uF, 60 Hz, 884 ohms
  • 1 uF cap, 1mA selection

OctopusTester Cap 1uF-01.png

  • 1 uF cap, 10mA selection

OctopusTester Cap 1uF-02.png

Zener[edit]

  • 3.9V Zener
  • 1 mA switch setting

OctopusTester Zener-01.png

  • 10 mA switch setting

OctopusTester Zener-02.png

Cutouts on Bud Box CU-1945[edit]

OctopusTester FRONT-BACK.PNG

Videos[edit]

Parts[edit]

  • Typical transformer
    • 1.38 in L, 2.38 in W, 1.38 in H
  • Build into Bud Box CU-1945
    • 6.21 in W x 3.76 in D x 2 in H
    • Comes with screws and rubber feet
  • (1) Black, (1) Red binding posts
  • (2) Chassis mount BNC connectors
  • C13 AC jack with switch
  • 5x20 Fuse holder
  • 1A fuse (5x20)