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Old Tektronix or new Hantek

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mawyatt:

--- Quote from: tggzzz on December 05, 2024, 12:02:47 pm ---
* I have a 200ps/1.7GHz 1970 scope that uses BC107 (fT=350GHz) transistors in the signal path
--- End quote ---

That's a pretty fast transistor, even today ;)

BTW for DSO use, Sample Rate should only be discussed along with Bandwidth as they are both limiting DSO functions that are inter-related. There's a new DSO (won't mention brand as it's likely to start another flame war) that when "enabled" and using all 4 channels has an effective Channel Sampling Rate which violates it's Channel Nyquist Bandwidth!!

Best

mawyatt:

--- Quote from: Conrad Hoffman on December 05, 2024, 02:43:31 pm ---It took 12-bit to get me away from analog scopes. I've used 8/9 bit scopes at work for years and they didn't move me enough to get one, no matter how fast or expensive. The memory depth on the older scopes is too small. Plus, the FFT on 8/9 bit scopes seems near to worthless for any real world problem. Depending on what you're doing, # of channels and bandwidth, even the lower end Siglent SDS800 series could make you quite happy for not much $$.

--- End quote ---

Had a similar experience long ago. When we were allowed in the lab (our value was perceived at creating more company $ developing systems, circuits, chips rather than in the lab testing such), not too impressed by the DSOs back then and always reached for a Tek Analog Scope.

When we semi-retired we needed a scope for our home lab and acquired a pair of familiar Tek 2565Bs which we repaired/restored. Later we studied this forum and decided on a DSO for our lab and selected the SDS2000X+, which even tho 8 bit ADC based was quite impressed (it has 10 bit mode) with the performance/features wrt to cost.

Now with the 12 bit SDS800X HD, this moves to another level of performance/features vs $, of course our "appetite" was created with the SDS2000X+ and we are getting hungrier :-+

Best

tggzzz:

--- Quote from: mawyatt on December 05, 2024, 03:12:02 pm ---
--- Quote from: tggzzz on December 05, 2024, 12:02:47 pm ---
* I have a 200ps/1.7GHz 1970 scope that uses BC107 (fT=350GHz) transistors in the signal path
--- End quote ---

That's a pretty fast transistor, even today ;)

--- End quote ---

Oh... picky picky picky.

30 years ago I worked on a project demonstrating data comms in the 60GHz ISM band. Filled a room, and was deafening.

Now there are many chips for short-range distance measurement, especially for cars.

tggzzz:

--- Quote from: Conrad Hoffman on December 05, 2024, 02:43:31 pm ---It took 12-bit to get me away from analog scopes. I've used 8/9 bit scopes at work for years and they didn't move me enough to get one, no matter how fast or expensive. The memory depth on the older scopes is too small. Plus, the FFT on 8/9 bit scopes seems near to worthless for any real world problem. Depending on what you're doing, # of channels and bandwidth, even the lower end Siglent SDS800 series could make you quite happy for not much $$.

--- End quote ---

Yup, the "use case" is critical information.

I started on 1GHz 6-bit boat anchor DSOs at work. OK for some purposes.

I quite like my 10MHz 14bit Digilent Analog Discovery. The added AWG and simple digital pattern generation/capture make it easy to implement, say, N-path filters and Tayloe mixers. Having the decent post-processing makes it easy to demonstrate their surprisingly interesting characteristics.

Performa01:

--- Quote from: mawyatt on December 05, 2024, 03:12:02 pm ---
--- Quote from: tggzzz on December 05, 2024, 12:02:47 pm ---
* I have a 200ps/1.7GHz 1970 scope that uses BC107 (fT=350GHz) transistors in the signal path
--- End quote ---

That's a pretty fast transistor, even today ;)

--- End quote ---

Yes, I was quite shocked too. Having still worked with the TO18 BC107/1087/109 in the seventies of last century, I've always thought they had 200 MHz transition frequency, and that only at relatively high collector currents between 15 and 25 mA. Had I known about the secret 350 GHz of these transistors, I would still have been baffled how a relatively big  leaded component can be that fast...

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