Products > Test Equipment
Probe into probes. What's up?
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bdunham7:

--- Quote from: BillyO on January 31, 2023, 08:01:54 pm ---Yes.  Why?

--- End quote ---

The first screenshot in your second post is labelled "Tek 6139 Bodnar" but the scope is set to DC50 input....
tautech:

--- Quote from: BillyO on January 31, 2023, 08:21:06 pm ---
--- Quote from: tautech on January 31, 2023, 08:11:09 pm ---
--- Quote from: BillyO on January 31, 2023, 08:07:04 pm ---No ground wire used.  Connected through probe adapter.

--- End quote ---
Something's not right.
Some waveforms 0V is not on the 0V channel level like they're in AC input mode.

--- End quote ---
The Bodnar outputs an AC signal.

--- End quote ---
Okay yeah, missed one waveform was 10 MHz and the other 20 MHz.

Pop the lid of the compensation box and have a squiz at what's in there.
You might need to download the old book on Tek probes to follow the schematic of how these were constructed.
https://w140.com/tekwiki/images/6/62/062-1146-00.pdf
BillyO:

--- Quote from: bdunham7 on January 31, 2023, 07:38:36 pm ---Group delay...have a close look at the Tek 6139A datasheet.

--- End quote ---
I can't seem to find this.  It no longer seems to be on the Tek site and nothing else I have found makes mentions the group velocity characteristics.

I guess you are suggesting that the different frequency components of teh sharp square waves will have different velocities in the probe system?
BillyO:

--- Quote from: bdunham7 on January 31, 2023, 08:29:54 pm ---The first screenshot in your second post is labelled "Tek 6139 Bodnar" but the scope is set to DC50 input....

--- End quote ---
Not that I can see.  It says DC1M.
bdunham7:

--- Quote from: BillyO on January 31, 2023, 08:35:42 pm ---I can't seem to find this.  It no longer seems to be on the Tek site and nothing else I have found makes mentions the group velocity characteristics.

I guess you are suggesting that the different frequency components of teh sharp square waves will have different velocities in the probe system?

--- End quote ---

Yes, exactly.

https://w140.com/tekwiki/images/a/af/063-0870-05.pdf
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