Difference between revisions of "Octopus Tester"
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| Line 19: | Line 19: | ||
** Timebase = XY | ** Timebase = XY | ||
** Connect to XY on scope (X=CH1, Y=CH2) | ** Connect to XY on scope (X=CH1, Y=CH2) | ||
| − | ** | + | ** CH2 gets set to INVERT |
* Plus, Minus Banana jacks | * Plus, Minus Banana jacks | ||
* AC powered | * AC powered | ||
Revision as of 15:31, 5 September 2021
Contents
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
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
Schematics
- Adjust RV2/RV2 for total resistance (fixed resistor plus pot)
- 891 - 1 mA switch setting
- 8910 - 10mA switch setting
Videos
Build
Cutouts on Bud Box CU-1945
