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| 10 MHz on Sampling Scope w/40 MHz Trigger, Not As Expected |
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| TheWaterbug:
--- Quote from: David Hess on January 27, 2024, 12:11:36 pm ---Modern sampling oscilloscopes work that way, but nothing prevents sampling before the trigger like some old Tektronix models do. Sampling before the trigger allows displaying the trigger edge and earlier without a delay line which would limit bandwidth. In order to do this, the sampling oscilloscope phase locks to the trigger source allowing for a negative trigger delay to be applied to the sampling strobe. --- End quote --- Is the CSA8200 considered "old" 😁 |
| David Hess:
--- Quote from: TheWaterbug on January 27, 2024, 04:55:09 pm --- --- Quote from: David Hess on January 27, 2024, 12:11:36 pm ---Modern sampling oscilloscopes work that way, but nothing prevents sampling before the trigger like some old Tektronix models do. Sampling before the trigger allows displaying the trigger edge and earlier without a delay line which would limit bandwidth. In order to do this, the sampling oscilloscope phase locks to the trigger source allowing for a negative trigger delay to be applied to the sampling strobe. --- End quote --- Is the CSA8200 considered "old" 😁 --- End quote --- No, the CSA8200 is modern on this scale, 2002? The Tektronix 3T2 (1967) and 7T11 (1969 to 1990) supported random sampling. Tektronix also made delay lines for sequential sampling oscilloscopes so the trigger edge could be viewed, but they severely limit bandwidth. I think it came down to digital storage oscilloscopes becoming fast enough, and sampling oscilloscope applications not requiring viewing of the trigger edge, so random sampling was no longer required. |
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