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| Choosing an oscilloscope |
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| David Hess:
--- Quote from: rf-loop on October 08, 2020, 11:31:41 am ---And I do not mean memory CRT. Memory CRT problem is that even fastest have quite slow drawing speed (and if everyone in lab use these, mostly some o0f them then destroy this tube due to total lack of knowledge how to use these. Same with micro channel tubes). --- End quote --- Not all storage CRTs were slow; the image-transfer type were fast enough to support bandwidths to 100s of MHz. |
| mawyatt:
Also I recall Tek had some scopes that used Charge Coupled Chips (CCDs) called Bucket Brigade Devices which sequentially captured the analog signal, and not used as an imager. The CCD chip would be read out at a slower rate and digitized with a slower ADC. Good for capturing short period single or infrequent events like fast glitches. Nice Tek scope image, very artsy indeed ;D Reminds me of the old Tek scope hoods & camera that used Polaroid film :) Best, |
| Vestom:
--- Quote from: rf-loop on October 08, 2020, 11:31:41 am ---But what important is missing in your image or least I do not see it. Camera "trigger". Camera need be sync with scope trace draw if want capture single shots. Many Tek and HP scopes have this feature. Also some times fast writing CRT with some very fast phosphor. But yes, nice image, perhaps technically back light level bit too high, it is masking too much some rising edges... (but if think just art... perhaps ok) --- End quote --- You do not need to sync with camera shutter. In fact, I seriously doubt any camera shutter would be fast enough for that anyway... You just need to keep the shutter open until the scope has trigged and the single shot is captured - while keeping your lab dark! That is also the likely explanation for the over-exposed reticule. But well, time has moved on... :phew: |
| SilverSolder:
--- Quote from: Vestom on October 08, 2020, 07:39:02 pm ---[...] But well, time has moved on... :phew: --- End quote --- Are you saying, I can clear out the dark room and use it for something other than photography??? |
| tautech:
--- Quote from: SilverSolder on October 09, 2020, 01:39:46 am --- --- Quote from: Vestom on October 08, 2020, 07:39:02 pm ---[...] But well, time has moved on... :phew: --- End quote --- Are you saying, I can clear out the dark room and use it for something other than photography??? --- End quote --- Maybe but keep it dark for a certain well known brand and model DSO that has a dim display. :box: |
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