Patent US 2883619A: Difference between revisions
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The 10th Tektronix patent, this is the famous invention of using lossy coax cable (a resistive center conductor) in a passive probe to dampen reflections and ringing. | |||
[[John Kobbe]] said: | |||
<blockquote> | |||
"Another anticipated problem with passive probe, we knew a signal bounced back and forth so we could not use the standard probe. | |||
While thinking about things to do like some damping resistors. Why not us a fine resistance wire as the center conductor. | |||
This time we really lucked out, it worked better than anticipated. It was even patent-able as was [[Patent US 2804571A|unblanking]] and [the] sweep circuit." | |||
</blockquote> | |||
==See also== | |||
* [https://w140.com/US2930986.pdf US2930986.pdf] | |||
* [https://vintagetek.org/oscilliscope-patents/ Tek Stories: Oscilloscope Patents] by John Kobbe | |||
* [http://dfad.com.au/links/THE%20SECRET%20WORLD%20OF%20PROBES%20OCt09.pdf Doug Ford, ''The Secret World of Oscilloscope Probes''] | |||
Revision as of 14:22, 9 April 2022
| Patent number | US 2883619A (click link for details and documents via Google Patents) |
|---|---|
| Title | Electrical probe |
| Inventors | John Kobbe, Bill Polits |
| Company | Tektronix Inc |
| Filing date | 1956-02-29 |
| Grant date | 1959-04-21 |
Cited By:
| Patent | Title | Inventors | Assignee | Granted |
|---|---|---|---|---|
| Patent US 3256484A | High voltage test probe containing a part gas, part liquid dielectric fluid under pressure and having a transparent housing section for viewing the presence of the liquid therein | Paul V Terry | Tektronix Inc | 1966-06-14 |
Related products:
| Manufacturer | Model | Description | Introduced | Designers |
|---|---|---|---|---|
| Tektronix | P410 | 10× passive probe | 1955 | |
| Tektronix | P6053 | 500 MHz, ×10, passive probe | 1970 | |
| Tektronix | P6053B | 200 MHz, ×10, passive probe | 1973 |
The 10th Tektronix patent, this is the famous invention of using lossy coax cable (a resistive center conductor) in a passive probe to dampen reflections and ringing.
John Kobbe said:
"Another anticipated problem with passive probe, we knew a signal bounced back and forth so we could not use the standard probe.
While thinking about things to do like some damping resistors. Why not us a fine resistance wire as the center conductor.
This time we really lucked out, it worked better than anticipated. It was even patent-able as was unblanking and [the] sweep circuit."