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| Siglent ISFE, scope front end isolator, any opinions? |
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| _Wim_:
Does anyone has some actual experience with the Siglent ISFE? I am currently trying to repair the switch mode power supply part of an induction cooking plate (of which I have no schematics, and which has lots of signals riding on mains voltage), and this might be useful if it works reasonably ok. The 1Mhz bandwidth limit should be ok from what I have seen so far (currently I am using 2 unreferenced probes and the A-B math trick for probing floating signals), but because the signals of interest are reasonably small and riding on 230VAC mains, this approach is too noisy to be useful. I like the fact that it would allow me to probe 2 signals at one, but the 1/200 attenuation worries me that I will end up having the same noise levels as I have now, so actual user experience or a teardown or a description of the operation principle would be very much appreciated. |
| tautech:
From tests that I've done it reproduces more accurate results with the supplied aligator leads than scope probes. Waveforms can be noisey but easy to clean up with the likes of Hi Res mode. |
| _Wim_:
Hi Tautech, Thanks for the quick reply. Did you make a comparison between using A-B and using the ISFE device? Hi-res mode is not an option for me, because the signal is not sufficiently repetitive (switch mode PS tries to restart approx every second and almost immediatly afterwards shut down again because of overvoltage on the secondary side). |
| tautech:
--- Quote from: _Wim_ on November 29, 2015, 05:30:21 pm ---Hi Tautech, Thanks for the quick reply. Did you make a comparison between using A-B and using the ISFE device? Hi-res mode is not an option for me, because the signal is not sufficiently repetitive (switch mode PS tries to restart approx every second and almost immediatly afterwards shut down again because of overvoltage on the secondary side). --- End quote --- @Wim Sorry never did use Maths on a ISFE and away from base this week so can't post a screenshot ATM. |
| tautech:
Some years since I had a play with these but a customer ordered a couple which we need check before delivery. SDS1104X-E with 2ch ISFE powered from scope USB port. As can be seen at LV levels such as the 3V probe compensation output waveform noise is a few mV as input sensitivity is set to 10mV/div for a 2V/div for this 200:1 ISFE adapter which is supplied with BNC to Croc clip 1x leads. Ch4 normal 10x probe as comparison. |
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