EEVblog 1630 - Micsig MDP700 HV Differential Probe Review - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 20, 2024, 12:42:12 am
content: Micsig MDP700 High Voltage Differential probe review and comparison wit the older DP10007 and the EEVblog HVP70 probe.https://s.click.aliexpress.com/e/_DnNvolN00:00 - Micsig MDP700 High Voltage Differential probe unboxing08:50 - Basic differential probe measurement test12:00 - Noise measurements15:20 - CMRR measurement using FRA21:43 - Spot frequency CMRRR measurement technique24:51 - Measuring Unicorn farts at 100MHz26:45 - ConclusionCMRR measured and explained:GaN MOSFET Experiemnts with fibre optic high voltage probe:Reverse engineering the DP10007:

author: FxDev
author_rank: Regular Contributor
timestamp: July 20, 2024, 08:25:53 pm
content: @EEVblog Dave I think you are wrongThey fixed the DP seriesJoking aside, I recently ordered the Micsig DP10013 model from the link below. Later, I actually received the DP10013 but with a difference—it's actually from the DP1500 serieshttps://www.amazon.com.tr/dp/B074K4XPW3?psc=1&ref=ppx_yo2ov_dt_b_product_detailsI don't know why they did this, but getting the DP1500 series instead of the DP10013 made me happyI guess they named it DP10013 to avoid issues with the place I bought it from; otherwise, a clueless customer might have returned it saying that they didn't receive this brand.I compared with Tektronix THDP0200 and Micsic DP1500 series with 350V. As you can see, there is no difference.

author: Kleinstein
author_rank: Super Contributor
timestamp: July 21, 2024, 07:21:41 am
content: For the noise comparison it may have made more sense to set the BW to 20 MHz at the scope (most scopes offer this). I don't think they have specs for this, but this would be the same BW for all 3 probes and very reasonable setting for real life use too.The spot measurement at 10 MHz should not use the AC-RMS, but ideally would compare FFT components. The RMS includes quite some noise from other frequencies.Not having averaging in the frequency response function is a bit disappointing. It does not need to be explicite averaging as with the scope. Just a longer timer per point and this lower speed would do it as well or even better. With the very high attenuation one may have to check that there is no scope internal coupling. The isolation between the channels may not be that much bettter on some scopes.

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: August 03, 2024, 10:09:51 pm
content: @Dave , I can explain the behavior of your R&S scope. I know the answer as to why it doesn't do averaging when going beyond the native resolution of the ADC because I've been spending way too much time looking at these higher resolution scopes. I say "looking" because I can't afford them.But anyway, the reason is because they're doing averaging/decimation to get you to that 18bits of resolution. Any further averaging would have a multiplicative effect on the amount of samples that needed to be captured. Likewise, you drop down from 18bits to 16bits as frequency increases because of the same.I'd like to see the teardown.I can't post on YT because I don't have a YT account. I deleted it years ago after they started censoring everyone and his cousin's YT channel (even the non-political channels). Though before that, I noted that I had already been "shadow banned" to some extent. This was really weird because I never posted about politics, or any other hot button topic.Thanks

author: EEVblog
author_rank: Unknown
timestamp: August 04, 2024, 10:21:30 am
content: Quote from: ballsystemlord on August 03, 2024, 10:09:51 pmYes, this is correct, and R&S have confirmed this.

author: chilternview
author_rank: Frequent Contributor
timestamp: July 19, 2025, 09:16:42 am
content: I'm not sure why anyone would buy a DP700 if it's 20x/200x when the DP1500 is also 20x/200x, and rated to 1500v.The original Micsig spec is incorrect (or they changed it) - see photos of mine...

author: meteo
author_rank: Contributor
timestamp: August 18, 2025, 08:33:18 am
content: Micsig MDP700 manufacturer's details:20X < 22 mVrms20X (5MHz) < 8 mVrms-------------------------------------------The tester's crocodiles are shorted. RTB2004 (< 70 MHz)20X - AC RMS - 14,9 mV20X - DC σ - 14,1 mV20X - AC RMS - 20 MHz @ oscilloscope, 5 MHz @ probe - 7,6 mV20X - DC σ - 20 MHz @ oscilloscope, 5 MHz @ probe - 6,1 mV-------------------------------------------Bruel &Kjaer 2636, 1 MoHm, shorted crocodiles, 0 - 200 kHz, true RMS:20Х - 250 µVrms х 20Х = 5 mVrms20Х (5MHz) - 250 µVrms х 20Х = 5 mVrms200Х - 24 µVrms х 200Х = 4,8 mVrms200Х (5MHz) - 24 µVrms х 200Х = 4,8 mVrms20X - AC RMS - 14,9 mV20X - DC σ - 14,1 mV20X - AC RMS - 20 MHz @ oscilloscope, 5 MHz @ probe - 7,6 mV20X - DC σ - 20 MHz @ oscilloscope, 5 MHz @ probe - 6,1 mV

author: meteo
author_rank: Contributor
timestamp: August 18, 2025, 08:39:45 am
content: I tried to connect the smartphone power bank, 20 W, with a short USB-C cable. In the hope that there would be less noise. But it turned out the opposite, from the standard long cable and network power supply the noise is less. Are there low noise batteries for measurements or is this not necessary?20X - DC σ - 20 MHz @ oscilloscope, 5 MHz @ probe - 6,1 mVPower supply in the socket.20X - DC σ - 20 MHz @ oscilloscope, 5 MHz @ probe - 9,6 mV20W battery for smartphones.---------------------------------------Bruel &Kjaer 2636, 1 MoHm, shorted crocodiles, 0 - 200 kHz, true RMS:20Х (accu) - 250 µVrms х 20Х = 5 mVrms20Х (5MHz, accu) - 250 µVrms х 20Х = 5 mVrms200Х (accu) - 24 µVrms х 200Х = 4,8 mVrms200Х (5MHz, accu) - 24 µVrms х 200Х = 4,8 mVrms

author: meteo
author_rank: Contributor
timestamp: August 18, 2025, 08:49:46 am
content: In order to fully understand the entire measurement bundle, internal noise of the oscilloscope. The oscilloscope output is shorted.R&S RTB2004 (< 70 MHz): DC σ - 47 µVR&S RTB2004 (< 70 MHz) @ 20 MHz limitation : DC σ - 28 µVIn general, the reserves are sufficient for measurements in my opinion. But there are power supplies with pulsations of 1 millivolt, 2-10 volts. For them, a differential probe 1:1 / 10:1 with noise of hundreds of microvolts is already needed.