On Thu, 14 Feb 2019 11:25:53 -0800, wrote:


So, as near as I can tell, the probes are all right, at least they
all act the same. But what causes the distorted square wave at the 1x
setting?

It's caused by the lack of high frequency response (i.e. rise time) in
X1 mode. For a typical X10/X1 switchable problem, the frequency
response is MUCH higher in X10 than in X1. For example:
https://www.tiepie.com/en/usb-oscilloscope/accessories/oscilloscope-probe-250mhz-x1-x10
Notice that the bandwidth is 250MHz in X10 but only 6MHz in X1.
This one is closer to what I think you bought:
https://www.tiepie.com/en/usb-oscilloscope/accessories/oscilloscope-probe-60mhz-x1-x10
60MHz bandwidth in X10 and 6MHz bandwidth in X1.




--
Jeff Liebermann
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