| Products > Test Equipment |
| Active Probe recommendation? |
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| IDEngineer:
--- Quote from: Domitronic on September 01, 2022, 06:08:43 pm ---Edit: Just saw that prices of Tetris probes increased drastically. So i would also prefer a used probe of a big brand. --- End quote --- I appreciate the link nonetheless! In my case I already have the Tek 1103 dual channel power supply so my configuration is basically that of the Tetris probes already, and compatible with any BNC equipped scope. |
| MarkL:
--- Quote from: IDEngineer on September 01, 2022, 04:32:52 pm ---Thanks for the link. Note that it's for the later 15V version (see page 1-8). --- End quote --- Yeah, I was never able to find any manual old enough to show the old spec. Besides being printed on the probe, you can find the 40V spec listed in the catalogs from 1998 to 2000 or so. It's way beyond the usable dynamic range of the probe anyway. --- Quote ---I do give Tektronix credit for an imaginative variety of probe tips. Those were the days... T&M manufacturers just "spent the money" to do things properly. You can still find that but it doesn't feel like the automatic default anymore. --- End quote --- Sad but true. My company purchased a brand new $20k 1GHz Agilent scope a few years back, and it came with the most embarrassingly cheap, klunky probes. Perfect for work on tubes or transistor radios. There wasn't even a purchase option to upgrade to better probes, or to delete the probes. Tossed the stock probes in a drawer unused and bought decent ones. |
| David Hess:
You can make an active probe with that sort of performance and less input capacitance than any that you can easily buy, as shown below. For higher performance, I might replace the 2N3904/2N3906 complementary follower with a 30 volt current feedback amplifier configured as a voltage follower. |
| IDEngineer:
That's a very interesting idea. I might have those parts just lying around. Looks like a Jim Williams schematic...? |
| tautech:
--- Quote from: IDEngineer on September 02, 2022, 09:11:01 pm ---That's a very interesting idea. I might have those parts just lying around. Looks like a Jim Williams schematic...? --- End quote --- It's not. Tek Oscilloscope Probe Circuits, a booklet or PDF everyone should have: https://w140.com/tekwiki/images/6/62/062-1146-00.pdf |
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