Hi guys,
I'm working with some ~32Mhz signals at the moment and can't figure out whether I have a problem with my oscilloscope being too low in bandwidth or whether there is something wrong with the signal itself.
I have a Tektronix 2431L scope. According to link #1, it's a 40Mhz real time bandwidth scope (so obviously this is woefully insufficient for my purpose) in real time mode, but in equivalent mode, it should allow me to see up to the 9th harmonic as per link #2:
http://w140.com/tekwiki/wiki/2432http://mustcalculate.com/electronics/harmonics.php?f=32MLink #3 is just another spec of my scope.
https://www.eurekaspot.com/sp.cfm/DIGOSC/TEK/2431L.htmlWhat I'm seeing is pretty much identical to what the guy from this thread is seeing:
https://electronics.stackexchange.com/questions/334082/why-is-30mhz-clock-signal-distorted-on-oscilloscopeI tried measuring the signal with the spring, but got identical results to when I used a ground lead.
The only problem I'm seeing is that we're both using a Tektronix scope

. Anyway...
I set up my scope to be in repetitive mode, which according to the manual does the following:
"When ON, repetitive sampling for NORMAL, ENVELOPE and AVG mode acquisitions is enabled. At SEC/DIV settings of 200ns and faster, the time base is sampling the incoming waveform at its maximum rate of 250 megasamples/second. With REPET OFF, data points that fall between the actual digitized points on the waveform are interpolated to obtain their displayed positions. Interpolation allows expansion of the acquired data to a SEC/DIV setting of 2 ns on a single-event acquisition up to a Useful Storage Bandwidth of 100 MHz. At SEC/DIV settings of 100 ns and faster, REPET ON invokes random sampling (also called equivalent-time sampling) of the incoming signal, extending the bandwidth of the instrument to 300MHz for repetitive signals."
So 300Mhz might not be drastically more than the other guy's 200MHz but I'm not sure.
The other signals that are derived from clock appear to behave as expected, so I have a feeling my clock signal is fine and is a square wave, but my device isn't working, so I'm currently investigating the clock signal.
Would love to hear your opinions on what I'm experiencing.
EDIT: Forgot to mention that I have these probes:
https://www.caltestelectronics.com/ctitem/20-probe-oscilloscope-passive-voltage/CT3133RA