Products > Test Equipment
Choosing an oscilloscope
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rf-loop:

--- Quote from: David Hess on October 08, 2020, 12:10:07 pm ---
--- 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.

--- End quote ---

Yes I forget these bit more rare things.  ;)
rf-loop:

--- Quote from: Vestom on October 08, 2020, 07:39:02 pm ---
--- 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:

--- End quote ---

Yes. This is why I write "trigger"  and not trigger. Example with TEK 7000 series, single trig sweep mode you start pushing camera shutter open. It give signal to scope trigger system for enable next trigger. After it have trigged scope gate signal give info to camera for close shutter.
Camera body is fixed to front of CRT (between camera and CRT is now "darkroom" so no need dark room. Of course these scope camera can also take image fully manually. Also there is mirror system so that user can look CRT when camera is fixed front of CRT so no need all time take camera out and again insert.  Time ago,  due to lack of enough storage room anymore,  I sold out my whole lot of working Tek 7000,s scopeswith couple of plug ins. There was also one -54 with digitizer + "signal analyzing" keyboard and one model what have real dual beam CRT etc etc.  I did not find this scope camera and even now I do not know where it is - sadly it have disappeared, it was mint (or better) condition.. (of course not need today for anything but nice piece of history)
2N3055:

--- 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 ---

What do you mean. That is photography too.. :-DD
David Hess:

--- Quote from: mawyatt on October 08, 2020, 07:21:52 pm ---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.
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I have one and they work exactly as you describe.  Tektronix made CCD based DSOs for a long time where maximum sample rate on all channels simultaneously was desired and they were more than competitive with ADC and SRAM based DSOs.

The Tektronix TDS600 series were all CCD based and peaked at 3 GHz bandwidth, 10 GS/s, 120k sample record length, and 100 ps peak detection.
nctnico:

--- Quote from: David Hess on October 11, 2020, 12:39:18 am ---
--- Quote from: mawyatt on October 08, 2020, 07:21:52 pm ---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.
--- End quote ---

I have one and they work exactly as you describe.  Tektronix made CCD based DSOs for a long time where maximum sample rate on all channels simultaneously was desired and they were more than competitive with ADC and SRAM based DSOs.

The Tektronix TDS600 series were all CCD based and peaked at 3 GHz bandwidth, 10 GS/s, 120k sample record length, and 100 ps peak detection.

--- End quote ---
IIRC the Tektronix TDS600 series don't have peak detect and no such long records. This series is made for single shot acquisitions at maximium samplerate which makes them pretty limited for general purpose use.
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