Products > Test Equipment
Playing with Probes: Guessing game.
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BillyO:
BNC adapters were used.  Ground wires were removed.

The ones with the least ringing are the Siglent probes.


tautech:
Here's an example of 2 quality (read $) passive probes compared against the Bodnar pulser waveform captured and used as a Ref waveform, plugged directly to scope and 50 Ohm input engaged.



These probes were NIB but their HF response needed adjusting.
If we are to follow the HF adjustment instructions to the letter and use the fast edge of the Bondar pulser, in my view the probe step response need match the Ref waveform as well as is possible.

One of the above adjusted for best/cleanest step response while preserving some overshoot to best match a 50 Ohm connection.



--- Quote from: BillyO on March 04, 2023, 04:48:37 pm ---BNC adapters were used.  Ground wires were removed.
--- End quote ---
Same ^^^^


--- Quote from: BillyO on March 04, 2023, 04:48:37 pm ---The ones with the least ringing are the Siglent probes.
--- End quote ---
As expected.
Based on what I believe you have they will be PP510 and PP215, 100 and 200 MHz passive probes certainly without sufficient BW to resolve the edge speed and overshoot of a Bodnar pulser.
jonpaul:
Nice, any test with 400..500 MHz probes on 1 ghz BW scope ?
Test with Zo probes in 50 ohm env ?
Test with ghz FET probe?
j
tautech:

--- Quote from: jonpaul on March 04, 2023, 09:29:04 pm ---Nice, any test with 400..500 MHz probes on 1 ghz BW scope ?
Test with ghz FET probe?

--- End quote ---
Done in that previous thread Jon, SDS6204A (2 GHz) used in all tests.
https://www.eevblog.com/forum/testgear/probe-into-probes-whats-up/msg4678768/#msg4678768
https://www.eevblog.com/forum/testgear/probe-into-probes-whats-up/msg4684580/#msg4684580

--- Quote from: jonpaul on March 04, 2023, 09:29:04 pm ---Test with Zo probes in 50 ohm env ?

--- End quote ---
Sorry, don't possess one and never had the need.
Instead 100x and 1000x and active and differential probes have met my needs......that change daily....today it was 4hrs driving a tractor for my son.
jonpaul:
Rebonjour

Interesting to compare your probe responses to a zero cost, low L ghz Zo...

Précision 50 Ohm BNC coax>>> 450 or 4950 Ohm film or carbon comp 1/4 W resistance >>probe 50 ohm sources
very short shield to ckt rtn to minimize Lser

The result is a Zo  probe zero,cost very wideband low abberation
the series 450 Ohm is 10x. The 4950 Ohm is,100x.

This is similair to Tektronix P6156.

Bon Soirée

Jon



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