Difference between revisions of "Octopus Tester"
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| Line 16: | Line 16: | ||
** 8.91V - Vpeak | ** 8.91V - Vpeak | ||
** 17.82V - Vpeak-peak | ** 17.82V - Vpeak-peak | ||
| + | * [https://www.mouser.com/ProductDetail/Triad-Magnetics/F-13X?qs=b1anAsPanWz99oSBmlGHww%3D%3D Typical transformer] | ||
* 1mA, 10mA "scale" switch | * 1mA, 10mA "scale" switch | ||
** Pot adjustments to set current (accommodate transformer and line voltage variances) | ** Pot adjustments to set current (accommodate transformer and line voltage variances) | ||
Revision as of 17:06, 5 September 2021
Contents
Features
- Classic Octopus Tester
- Based on design example (N5BL)
- 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
- Typical transformer
- 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, 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
Schematics
- Adjust RV2/RV2 for total resistance (fixed resistor plus pot)
- 891 - 1 mA switch setting
- 8910 - 10mA switch setting
Cutouts on Bud Box CU-1945
Videos
