R7903
The Tektronix R7903 is a rackmount version of the 7903, a 3-slot 7904 that takes only one horizontal plug-in. Otherwise, aside from being rackmount shape, it the same as a 7904. The designers of the R7903 were Val Garuts, Thor Hallen, John McCormick, Les Larson, Bill DeVey, Bill Peek, Hans Springer, Joe Burger, Joel Swanno, and Ken Hawken.
Key Specifications
| Bandwidth | 500 MHz |
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| Fastest calibrated sweep | 500 ps/Div (with 7B92A, other time bases "uncalibrated for first 60 ns") |
| Acceleration voltage | 24 kV |
Links
- Anchorite Nevada Instrumentation Trailer with over 100 R7903s (photo and article @ vintagetek.org)
Patents that may apply to R7903
| Page | Title | Inventors | Filing date | Grant date | Links |
|---|---|---|---|---|---|
| Patent US 3453403A | Power selection device | Eldon Hoffman | 1966-08-18 | 1969-07-01 | 115 • 140 • 141 • 141A • 144 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 284 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2101 • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903 |
Internals
Early R7903 (SN B149999 and earlier) use the 670-2532-00 A11 horizontal amplifier board and have issues with horizontal aberrations for sweep rates of 1 ns/Div or faster. After discovery of the issue modification kits (040-0801-00) that replace the horizontal amplifier board were offered. For more information see the manual of the 067-0657-00 Normalized Ramp Generator that was use to investigate this issue.
Pictures
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Option 4: brighter, smaller scan CRT
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Option 4: brighter, smaller scan CRT
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R7903 rear
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R7903 Option 4 trace
Components
Some Parts Used in the R7903