Octopus Tester
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Contents
Features
- 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
- 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
- Adjust RV1/RV2 for total resistance (fixed resistor plus pot)
- 891 - 1 mA switch setting (RV2)
- 8910 - 10mA switch setting (RV1)
X-Y Patterns
Resistors
- Resistor - slope line
- Slope = resistance value
- 1 mA setting = 8901 ohms, 1:1 slope
- 10 mA setting = 890 ohms, 1:1 slope
Capacitors
- Oval shape
- 0.3uF, 60 Hz, 8841 ohms
- 3uF, 60 Hz, 884 ohms
- 1 uF cap, 1mA selection
- 1 uF cap, 10mA selection
Zener
- 3.9V Zener
- 1 mA switch setting
- 10 mA switch setting
Cutouts on Bud Box CU-1945
Videos
Parts
- 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)
