Products > Test Equipment
New MicSig/EEVblog DP10007 HV Differential Probe
Martin72:
Hi,
Quickshots of today, tomorrow afternoon carrying on for further playings.
Raw values without adding something.
Probe is setting to 10x.
Setup:
-Siglent SDS2504X HD
-Siglent SDG2122X
-Huber&Suhner 50 ohm termination.
Bode plot amplitude setting to max.
CMRR Plots 20Mhz and 120Mhz (thanks to the SDG2122X)
CMRR Value rms Ch1 and Ch2 at 10Mhz
Remarkable:
Calculated value meets the value in the bode plot. ( 20*log10(Ch2/Ch1) ) edit : phase also !
As mentioned before, further play arounds tomorrow - If you want to see something else with this setup, any comments on what I did today, feel free...
Martin
Martin72:
Another play before visiting relatives...
Using the formular editor of the scope, F is displaying 20*log(C2/C1).
In retrospect, I don't even know if I need to declare log10 additionally in the editor than just log.
I'll test it later.
PartialDischarge:
The phase of the CMRR is meaningless, what matters is the amplitude. Also the phase response in differential mode is also not very interesting, the pulse response in time axis is however more indicative
"Using the formular editor of the scope, F is displaying 20*log(C2/C1)"
It has to be the ratio of the rms value of the signals, not the ratio of instantaneous voltages.
Martin72:
Nevertheless, I like the way it fits together, both in Bode and measured in this way.
--- Quote ---It has to be the ratio of the rms value of the signals
--- End quote ---
Yes, that also occurred to me when I was on the road. ;)
But at the moment I don't know how to include this in the formula editor. :P
Martin72:
I got a second diff.-probe, a testec si-9002, 25Mhz.
Pics:
CMRR plot and "normal" bode plot up to 30Mhz.
Looks good and was expected.
To avoid "picture shuffling" I´ll post the bandwith results of the Micsig in a second post.
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