Products > Test Equipment
New MicSig/EEVblog DP10007 HV Differential Probe
RafaPolit:
This is a very useful thread, thank you!
I just bought a Keysight DSOX1204G, which should arrive in about a month or so (don't ask, living where I live has some serious disadvantages!).
After researching a bit, I would probably really want/need a differential probe. Keysight's cheapest one goes for about $700+ (compatible with the 1024). So, this really looks like a promising option without breaking the bank. Should I just pull the trigger (Amazon US claims only 2 left in stock), or is the new version coming so soon that it would be better to wait?
Thanks again for any feedback, and since it's my first post... just can't praise EEVblog and Dave high enough, you are really an essential tool for us amateur / newcomers to the field. Thanks a bunch!
Rafa.
EDIT: Amazon's seller is SainSmart Official, not sure if that is important info and if they are a trusted seller, price is really much lower than on MicSig's own site, so wondering if there is some weird issue going on?
Ferrer:
Hi friends. First of all, I want to express my respect and gratitude for all the topics and comments that I have seen developed in this forum, of great value for those of us who enjoy electronics.
In relation to the Micsig DP10007, there is a question that confuses me and that I have not seen dealt with in this thread: What is really the maximum voltage that it admits as input: 700 V (DC + AC Peak), or 700 V (DC + AC Peak to Peak) ?.
- The specifications found on the Micsig website indicate 700 V (DC + AC Peak)
http://www.micsig.com/html/41.html#
- In the Product Review of Bob Kalpon's channel it seems that the limit is 700 V (DC + AC Peak to Peak)
- In some stores on the web it also seems that the limit indicated in the Micsig specifications is not correct, and they state that said limit is 700 V (DC + AC Peak to Peak)
https://www.sainsmart.com/products/micsig-dp10007-high-voltage-differential-probe-kit
I no longer know what to believe. Could someone tell me what is your opinion on this?
I think it is an important question if we are going to use the differential probes on the hot side of a switching power supply if the mains voltage is 240V (It could mean a Peak to Peak voltage of around 680V, and a small Variation of the mains voltage could cause the device to explode and, as a consequence, destroy the oscilloscope).
bdunham7:
If they matched the specs of the ubiquitous Sapphire-OEM model (widely sold under various brand names like BK Precision, Probemaster, Tektronix, Cal-Test, etc) then it works like this:
That probe (the Sapphire) can withstand an input of 1400 volts peak +/- relative to the other lead, which if it was sinusoidal AC, would be about 1000VRMS or 2800Vp-p. It can read (produce a scaled output) of up to 700 volts peak +/- because it has a 100X scale factor and a 7 volt peak maximum output. The original (or at least the ones I remember) Sapphire models had 20X/200X scaling, so they had the same 7 volt peak output, but could measure the full 1400 volts peak. They later released a 10X/100X version like the MicSig, apparently because many scopes don't have 20X/200X attenuation settings and people don't like doing math in their heads.
The Micsig DP10007 may be based on the DP10013, in which case the peak number (for safety, not readings) may change to 1300 volts. Or perhaps it is only the 700 volts that it is rated for. In any case, it should be good for 1400Vp-p or 500VRMS. Note that they don't have a frequency derating curve for it. I rather doubt it can take 500VRMS @ 70MHz.
EEVblog:
--- Quote from: Ferrer on August 14, 2021, 09:13:52 pm ---I think it is an important question if we are going to use the differential probes on the hot side of a switching power supply if the mains voltage is 240V (It could mean a Peak to Peak voltage of around 680V, and a small Variation of the mains voltage could cause the device to explode and, as a consequence, destroy the oscilloscope).
--- End quote ---
I believe that is it's operational range. i.e. the range for which it is guaranteed to give an output to within specification (subject to derating). It will not suddenly blow up above that.
It handles my 245V mains voltage waveforms no problem at all. I think I even took it to 270V RMS or so no problem, but I'll have to recheck this. I have a high voltage AC generator reference standard (up to a few KHz only) so I can take it up until the output waveform clips. I will have to do a short video demoing this sometime this week.
Kean:
FWIW, on my DP10013 set to 50X (130V max differential voltage) the over-range indicator comes on at about 95VRMS, i.e. about 270VP-P
So I'm pretty sure it is referring to DC + AC Peak, not DC + AC P-P
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