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2465B nonlinear sweep

 

I've recapped a 2465B and replaced a faulty U800 with a RU800, ran through cal OK except for one thing. It seems that at fast sweep speeds e.g. 5ns, the X axis is distorted appearing compressed to the far right of the waveform. You can see an image here (100MHz sine wave applied to Ch1) :
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Has anyone seen anything like this, or have an idea what may be causing it?
?
- Keith
 

Read the little notes below the table for that sweep speed calibration.
There is some compromise required at the highest sweep speeds.

Also, what makes you think any substitute for U800 is going to work
exactly like a real U800? The calibration is "tuned" to deal with the
vagaries of the real deal.

-Chuck Harris

On Sun, 20 Apr 2025 11:43:53 -0700 "Keith" <keith@...> wrote:
I've recapped a 2465B and replaced a faulty U800 with a RU800, ran
through cal OK except for one thing. It seems that at fast sweep
speeds e.g. 5ns, the X axis is distorted appearing compressed to the
far right of the waveform. You can see an image here (100MHz sine
wave applied to Ch1) :



Has anyone seen anything like this, or have an idea what may be
causing it?

- Keith

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