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Siglent1104X-E versus Square Waves

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tautech:
Yes something is not stable between the scopes HW counter and the frequency measurement.
Change input coupling to DC and give us another screenshot.....meanwhile I'll get mine out.

maddoxhq:
Interesting, I found the issue for the frequency, instead of directly connecting the output to the probe, I've been leaving my bread board jumpers on the probe and just grabbing on to them.

The AC vs DC coupling didn't seem to make any difference before or after.

The fact that I'm sitting at 120mV still is a bit odd.  I took off the feedthrough and put the probe directly to the scope and I get my 1.02Vpp like I would expect.  Frequency is a ton more stable now too.

tggzzz:

--- Quote from: tautech on August 06, 2023, 07:32:37 am ---Introduce the OEM PP510 probe (10x setting) and not only does it affect the direct connection to the Bodnar pulser, propagation delays due to probe lead length and some ringing becomes apparent also.
A higher BW probe will provide a better result.

--- End quote ---

Not if you use the long (10cm/15cm) ground lead. The ringing is caused by the inductance of the ground lead resonating with the probe's tip capacitance at around 100MHz. For an example, see https://entertaininghacks.wordpress.com/2016/09/17/scope-probe-accessory-higher-frequency-results/

For the OP, a beginner, the references here might well prove enlightening: https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/

maddoxhq:
Plus, now armed with the knowledge of my PP510 has a rated 8MHz BW, I cranked it up to about there and I wasn't at the -3dB mark yet.  That was found at the 10.25MHz mark.

Which honestly does make me feel a bit better, that feels like an appropriate result for a known rating.

Still, this is all leaving the 50ohm feed through on the floor in the corner of the room.  Seems like it's worthless honestly.

tautech:
Oh, are you using a probe in the system between the AWG and the scope ?
Quite suitable for HiZ measurements but not to terminate into on a 50 Ohm system.
At low frequency and sinewaves you'll get away with it however introducing a probe always affects the measurement fidelity in some way.
Study the last screenshot I posted.

More for you.
1 MHz 1Vp-p from SDG6022X, no different result to what I expect from the cheap SDG1032X.
50 Ohm output via BNC cable into the first termination grabbed, placed onto the scope.



Then remove termination but retain all previous settings
Then change source to HiZ which becomes 2Vp-p displayed on the AWG.
Note waveforms are the same amplitude.



Retain HiZ AWG output and reduce to 1Vp-p


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