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| Probe into probes. What's up? |
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| Njk:
--- Quote from: David Hess on February 03, 2023, 12:15:29 am ---It has been done at various times. The Tektronix A6902 is a good example which is fully documented, and there are modern faster probes. --- End quote --- Thanks for the link, it was interesting to see how they did it back in eighties in a pure analog way. Indeed, the isolation not something new but to-day it can be done in a number of different ways, because digital semiconductor technology is much more advanced now. For instance, google for isolated ADC or something like that. And it does not look like the price for T&M equipment is closely related to the cost of its internal components (RAM, etc). Some related discussions on this forum as well. What is remarkable, however, is that a battery, i.e., a thing that uses kilograms of precious raw materials, is still much more economical solution. |
| jonpaul:
NJK, Tautech, Bdunham7: Found my 2019 Tektronix 7104/&A29/LeoB 40 pS shots with Mini Ckts 20 db 50 Ohm atten. After selection of 7A29 and transient response adjustment both 7A29 and 7104, perhaps the best I can do. Your thoughts appreciated! Lower pix BNC inline atten and 50 Ohm term collection. Vive l'ANALOG! Vive TEKTRONIX! Bon week-end! Jon |
| jonpaul:
Rebonjour, New scope shots of Leo B 40 pS with/sans Mini Ckts -20 db to the reduce reflected energy from scope t pulser due to VSWR or Zo mismatch. Yokogawa DL7440 500 MHz BW, FS = equv 100 G/sec, sweep at 1 nS/div upper LeoB40>>Scope 50 Ohm lower: LeoB40>>Mini Ckts HAT-20 atten>scope 50 Ohm input Your thoughts? Jon |
| David Hess:
--- Quote from: tautech on February 03, 2023, 08:08:25 pm ---As time permits we certainly will look at many more things in detail and maybe even differential probes of which I only carry 25 MHz models to display although their rise times are slow they are quite adequate for many tasks --- End quote --- When using faster ones the limiting factor tends to be common mode rejection, so there may be no benefit to a higher bandwidth differential probe. |
| tautech:
--- Quote from: David Hess on February 05, 2023, 06:58:15 pm --- --- Quote from: tautech on February 03, 2023, 08:08:25 pm ---As time permits we certainly will look at many more things in detail and maybe even differential probes of which I only carry 25 MHz models to display although their rise times are slow they are quite adequate for many tasks --- End quote --- When using faster ones the limiting factor tends to be common mode rejection, so there may be no benefit to a higher bandwidth differential probe. --- End quote --- Of course unless you need that resolution. I was heading towards eventually demonstrating propagation delays with various probing techniques where I may need to revert to 100 MHz rated probes to get somewhere nearer the good ol' DP-25 differential probes we carry. Thanks for the poke and hopefully can provide some more pretty pics soon. :) |
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