Micsig CP2100B current probe - Page 1
Forum section: electronics / testgear

author: gregb
author_rank: Newbie
timestamp: February 07, 2020, 02:33:44 am
content: Had been working on a project using Trinamics stepper drivers (specifically thehttps://www.trinamic.com/support/eval-kits/details/tmc5160-bob/), and hit a point where I couldn't tune things further. Following the app notes as recommended required being able to view current waveforms. Current sense resistors weren't easily accessible in this case, and measuring voltage across an additional shunt wasn't yielding anything useful.I started keeping an eye out for decent current probes on EBay. Seems there's a lot of vintage Tektronix gear (eg TM502A with A6302 probe), but offered prices seem very large compared to sold prices o_OThe big problem with most new probes is low bandwidth. The chopper frequencies of the steppers started at 20kHz, so I thought I might be mislead by 50-100kHz probes.But late last year I found MicSig have some current probes on offer. There are two models - CP2100A (800kHz) and CP2100B (2.5MHz).The 800kHz version is about €180 and the 2.5MHz version (which I purchased) is about €310; this is substantially cheaper than the vintage probes I've been following. I got them fromhttps://eleshop.eu/who were good, but there seem to be many other suppliers.The probe is powered via usb, and connects directly to the scope. The controls are pretty self explanatory - has 10A (0.1 V/A) and 100A (0.01V/A) ranges, and a current 'zero'I've only done minimal testing so far, AC waveforms and on a 50load at low voltages / currents, nevertheless things seemed correctly scaled on these low ranges. Waveforms are noisy because of the low range. At higher frequencies there was a very slight delay (order of a few %) but that could be due to my testing procedure, and isn't really important to my intended usage.I don't have ready access to the original project that got me interested in this equipment, but I'll try it on that when I get the chance. Bought the probe mainly because it seemed generally useful, but also to feed that growing Test Equipment addiction I seem to have acquired.Advice on usage / questions welcome!Greg

author: bob91343
author_rank: Super Contributor
timestamp: February 07, 2020, 04:29:06 am
content: I recently upgraded my HP628A to 628B, which has oscilloscope output and ranges up to 10A. It reports DC on the meter but the 'scope output is good to a few hundred Hz.I used to have a Tektronix current probe but it didn't work down to dc. But it was good to rather high frequency.In any case, while I would love to have a high frequency current probe, the cost is prohibitive.

author: Ivan7enych
author_rank: Regular Contributor
timestamp: February 07, 2020, 07:42:28 am
content: Can you tell how much noise it has in 10A range?I see in specification "Measuring range : 50mA~10Apk(10A)", but nothing about noise...

author: tautech
author_rank: Super Contributor
timestamp: February 07, 2020, 08:19:38 am
content: Quote from: gregb on February 07, 2020, 02:33:44 amIt is perfectly normal for current probes to show a propagation delay WRT a passive probe.It is addressed/corrected using the scopes probe deskew feature so voltage and current peaks align.Itmattersfor scopes with Power Analysis capabilities.

author: gregb
author_rank: Newbie
timestamp: February 07, 2020, 06:28:15 pm
content: @bob91343 - I hadn't seen those, will look them up. Haven't tested near DC yet.@Ivan7enych - On the 10A range I was only testing currents around 100mA - so the noise I was seeing was around 10-20% on 1-2mV - very consistent and about the floor of my scope and not a fair test really. However in average mode the waveforms followed *really* tightly and followed the applied voltage waveform very closely. It's on my list of things to do to test a current amplifier with 1-2A.@tautech - that's really interesting, I hadn't twigged that they were useful for that. Maybe handy for switch mode supplies, or even RF?

author: tautech
author_rank: Super Contributor
timestamp: February 07, 2020, 08:00:41 pm
content: Quote from: gregb on February 07, 2020, 06:28:15 pmAffordable current probes don't have many RF applications as frequencies are too high however for 'things' switching they are a necessary tool. Good ones will allow you to see when you're approaching saturation of your magnetics if needing to push a design to the limits.In your OP you talked about the high prices of them but if you know what you want and are patient you can pick up good Tek current probes for just a few hundred $ on eBay. I've got a few from there over the years and never paid more than $300 for 50 and 100 MHz AC current probes. They are specialist bits of gear and expensive to replace so care need be taken not to abuse them in any way.

author: nctnico
author_rank: Super Contributor
timestamp: February 07, 2020, 11:07:22 pm
content: $300 for an AC current probe is way too much. You can make such a probe yourself using a small current transformer which costs a few dollars at most. Getting 10MHz of bandwidth is easy.

author: gregb
author_rank: Newbie
timestamp: February 08, 2020, 02:19:25 am
content: @nctnico - re: current transformers - thanks for the tip, I haven't used those before; would be interesting to compare. For the stepper control case I'm certainly mainly interested in AC.

author: tautech
author_rank: Super Contributor
timestamp: February 08, 2020, 03:13:56 am
content: Quote from: gregb on February 08, 2020, 02:19:25 amDon't get your hopes up too high for a simple solution.....been there done that !My first current probe was a CT rescued from an old PC PSU where it presumably did duty at a few 10's of KHz.Connecting a coax and BNC for the old CRO I had at the time terminates it into the scopes 1M inputs then where you need something to calibrate it against, in that case a borrowed Tek P6021 and shunted the CT output with a resistor so that the 2 current probes readings matched to some reasonable degree.Enevidably sensitivity wasn't sufficient for my needs and the clumsiness of use needing to feed a wire through the core sealed its fate of hanging on a nail in the shed where it still is and to this day my focus still remains on the wonderful decades old Tek designs like P6021 and P6022.

author: bob91343
author_rank: Super Contributor
timestamp: February 08, 2020, 04:39:16 am
content: I would like some guidance on how to make a current probe. One problem is that the current to be measured would normally be opened for a shunt but the probe needs to clip on so as not to disturb continuity.So would I have to cut a ferrite to do this? I don't think that's easy. Maybe one of those clip on ferrites for interference control?

author: tautech
author_rank: Super Contributor
timestamp: February 08, 2020, 04:52:34 am
content: Not at all simple or everyone would be doing it !Insertion losses are to be considered at low currents and high frequencies.Have a study of this:http://w140.com/tekwiki/images/6/62/062-1146-00.pdf

author: nctnico
author_rank: Super Contributor
timestamp: February 08, 2020, 01:41:46 pm
content: Quote from: bob91343 on February 08, 2020, 04:39:16 amIn today's designs with SMD components you have to open the circuit anyway. Using litze wire reduces skin effect.@Tautech: you have to get a proper current sensing transformer for use in HF switching dc-dc converters and load it with a resistor at the oscilloscope side.

author: tautech
author_rank: Super Contributor
timestamp: February 08, 2020, 07:44:50 pm
content: Quote from: nctnico on February 08, 2020, 01:41:46 pmNope, I have 2 perfectly good Tek current probes rated to 50 and 100 MHz and highly respect the signal fidelity and sensitivity these fine old designs preserve.

author: nctnico
author_rank: Super Contributor
timestamp: February 08, 2020, 07:57:48 pm
content: Quote from: tautech on February 08, 2020, 07:44:50 pmIf you have such probes then fine but my point is that you can't take a random current transformer (probably one for 50Hz) and then go on and claiming old Tektronix probes are better. That makes no sense. If you buy a current transformer intended for switching power supplies (these for example:https://www.we-online.com/catalog/en/WE-CST/) you'll get very good results for a few dollars. Sure you won't have clip-on probes but in the circuits I design I have to add a wire anyway if I want to measure the current (after lifting a component).

author: gregb
author_rank: Newbie
timestamp: February 09, 2020, 12:46:49 am
content: @tautech - Keeping an eye out for a Tektronix setup, one of your earlier posts that got me interested in them in the first place. That Tektronix note's good reading.@nctnico - Thanks for clarifying your suggestion, I wasn't sure you meant opening the circuit, or that the mini 1MHz transformers were the ones you were talking about. I couldn't find >1MHz, so it's useful to know they can still give a decent picture for higher frequencies. Went looking further and found these discussions:https://interferencetechnology.com/the-hf-current-probe-theory-and-application/I did find some split core sensors with claimed bandwidths in the MHz range - but their intended application was detecting current spikes from discharge.All of this is really useful.

author: tautech
author_rank: Super Contributor
timestamp: February 09, 2020, 12:59:47 am
content: Quote from: gregb on February 09, 2020, 12:46:49 amIf the one you have despite its low BW is doing its job and meets your needs just keep using it.Knowing what's 'out there' can be more costly than working with what you have already.Looking back, I wouldn't change a thing as I know these old Tek probes are hard to beat.

author: Calvin
author_rank: Regular Contributor
timestamp: February 09, 2020, 07:19:24 am
content: Hi,Vacuumscmelze offers a range of current sensors (Hall-element, 100/200kHz BW) that allow for hig precision current monitoring.I used T60404-N4646X662, T60404-N4646X400, T60404-N4646X410 and T60404-N4646X412 .... find them at Mouser or al.They all can be configured to three transformation factors.The X662 puts out a singleended offset voltage, while the other three put out a bipolar current, thereby making signal conditioning especially easy.A current loop has to be opened for testing with these devices, but if that is possible, these sensors work like a charm.regardsCalvinps. made single-sided mixed SMD/TH layouts for these sensors including the conditioning amplifiers and a dc-dc converter supply.If anybody is interested I could publish.pps. the X662 is available at Pollin.de at the moment for under 2€/pcs.

author: mnsergey
author_rank: Contributor
timestamp: February 24, 2020, 08:52:43 am
content: Dear gregb, I wanted to ask: after purchasing CP2100B, did you test it for compliance with the Rice Time parameter less than 175 nS ?I have a negative experience of purchasing this model (CP2100B pf $350 with delivery). When I received this product and conducted tests, I received a delay of about 400-450 nS which corresponds to the Junior CP2100A model. the Seller refused to compensate for the price difference, I opened a dispute and sent the device to China to the seller back.I will be grateful for any information on this device, as I want to buy it, but with honest, not with Chinese characteristicsP.S. I wrote to Micsig support and You know what they answered me through the seller ? "It is impossible to accurately estimate the Rise Time of the probe if the delay of the measured signal is greater than the Rise Time parameter of the probe" I laughed to tears, and replied that all over the world use the delay subtraction method, and I used the ready-made DELAY (1-2) Function in my RIGOL. I sent them a screen, of course.

author: mnsergey
author_rank: Contributor
timestamp: February 24, 2020, 09:33:01 am
content: Quote from: tautech on February 07, 2020, 08:19:38 amHello Ivan,I had a negative experience of buying CP2100B, after the measurements, the delay showed that I have at least a Junior model CP2100A although the labels and the certificate claimed that I was sent CP2100B. Opened a dispute, the Chinese refused to return the difference in price, I had to send Pribluda back to China. While on the road, it is not yet known what will end. 22+ thousand rubles in a limp state, so buying on ALI, You can easily get pricked.And this is not an isolated case, just yesterday came the differential probe DP20003 from the same Micsig/ And what do you think ? 10 NSEC instead of 3.5 and 25 MHz frequency band instead of the promised 100.Here they are Chinese...I remember Chinese watts on tape recorders; DSo by worrying about noise, you run the risk of getting Poo

author: nctnico
author_rank: Super Contributor
timestamp: February 24, 2020, 10:02:30 am
content: Perhaps your measurements setup is incorrect. To measure the bandwidth of a probe you need to use a 25 Ohm source (50 Ohm output of an RF generator terminated by 50Ohm). For a differential probe you need to twist the wires as well. The wires are definitely part of the probe'd design. For the lower voltage model of MicSig I measured around 70MHz to 80MHz and I think the higher voltage version should give the same results.

author: luma
author_rank: Regular Contributor
timestamp: February 24, 2020, 12:32:41 pm
content: Quote from: nctnico on February 24, 2020, 10:02:30 amYou might be thinking of the differential voltage probes from MicSig, not the CP2100A/CP2100B current probes shown here. I know you have a good deal of experience with these sorts of things (including your own designs) so while I have you here- What would be a good bench-top setup to measure rise time on a clamp-on current probe? I have a CP2100A on the way from China and would be interested in confirming the specs before trusting the readings based on mnsergey's experience above.

author: nctnico
author_rank: Super Contributor
timestamp: February 24, 2020, 12:39:52 pm
content: I'd connect short across the output of a 50 Ohm function generator and sweep the frequency. Rise time is just a rule of thumb; better measure the frequency.

author: 2N3055
author_rank: Super Contributor
timestamp: February 24, 2020, 01:31:28 pm
content: First thing, OP used probe with 50 Ohm termination. That is wrong. It should be used with 1 MOhm termination. Manuals are there for reason.Secondly, @mnsergey seems to confuse probe delay (probe deskew is there for that) with signal rise time. It might be a language barrier... Signal delay is not even specified in manual.Output of siggen with 50 ohm termination that has enough loop to fit the probe will be ok, but low current.Deskew calibration source (fixture) is realy best way to do it. If you have current probes you might want to get one anyways, it is counterpart of built in probe calibration source in scopes.One can actually be even built without much problems.. They are quite simple and it is a shame they are quite expensive, they could be sold at 50 € at a lot of profit, and everybody would buy one...

author: gregb
author_rank: Newbie
timestamp: February 24, 2020, 03:12:51 pm
content: @mnsergey - I haven't tried to do a characterisation of the bandwidth, or accurate measurement of delay yet. I wanted to ensure I was measuring things correctly before I put information out vs claimed specs. Also the frequency range I was initially interested in was at the lower end (100kHz) of this probe's spec.Had it setup with a 50ohm source via coax into a 50ohm load - not exactly as @nctnico was recommending, but maybe ok for 1-2MHz.Also at the moment I can only investigate low current (order of 200mA) from my siggen - would be nice to try it on higher currents, at least at lower frequencies.@2N3055 - re: "First thing, OP used probe with 50 Ohm termination. That is wrong. It should be used with 1 MOhm termination. Manuals are there for reason." - thanks for the tip; maybe I miscommunicated - my scope is a 1054z which is always 1MOhm, and I wasn't using a 50 ohm terminator on it. The load is 50 ohm, being driven from the 50 ohm output of a siggen.

author: mnsergey
author_rank: Contributor
timestamp: February 24, 2020, 04:44:26 pm
content: Quote from: nctnico on February 24, 2020, 10:02:30 amYou are completely right, according to the method of correct measurement. However, when I did not load the cable output of the oscilloscope-50 Ohms, although the generator output is standard 50 Ohms, it was a very insignificant additional delay-no more than 1nsec, since the cable is short-less than 0.5 m. But even this one nanosecond does not play a role, since I use the difference calculation method, where: Delay = Rise Time 2 - Rise Time 1. And this is confirmed by the screen where a special DELAY 2-1 function is used in my RIGOL.And how do you like the second screen, where I use sine and stop when the blockage becomes -3dB from the level at the frequency of 1MHz ?Admire.

author: mnsergey
author_rank: Contributor
timestamp: February 24, 2020, 05:12:53 pm
content: Dear 2N335,the language barrier has nothing to do with this, although English is not my native language.I understand the difference between Rise Time and delay. However, to measure the actual Rise Time using the "head-on" method, You need to have a generator with a Rise Time & Fail Tite with at least 100pSI don't have such a generator(my generator has a Rise&Fail Time ~ 9nS)The oscillogram of the generator output signal (yellow) shows this clearly.But I use the method when calculating the delay between the device's Rise Time and the generator's Rise Time. This is the correct method. Moreover, the frequency response measurement confirms my fears that the device does not meet the stated parameters of 100 MHz and 3.5nS.As long as I have the device, I can perform any tests according to Your recommendations.P.S. One post above I left the waveforms perhaps their study will give You something new.P.P.S. By the way, I have all the materials on CP2100B current probe measurements.I can post them if someone is interested.

author: mnsergey
author_rank: Contributor
timestamp: February 24, 2020, 05:38:25 pm
content: Quote from: nctnico on February 07, 2020, 11:07:22 pmWhy is the AC / DC probe being considered? I plan to use the power measurement option with MS05000. And this assumes several conditions, firstly only AC/DC and secondly a minimum delay, or at least a delay comparable to the voltage Probe, otherwise you will get incorrect data for the power meter due to amplitude and phase delays. That's why Micsig, that's why Micsig CP2100B, as the optimal price-quality for my task. A normal used Tektronix is from $1000 minimum, and it's scary to take it. Unfortunately, the Micsig CP2100B did not meet expectations

author: gregb
author_rank: Newbie
timestamp: February 24, 2020, 06:20:26 pm
content: @mnsergey So the rise is the problem, as the delay will be consistent and can be calibrated out. Will try to measure on mine when I have a chance - I haven't got the best test setup unfortunately, need more coax bits and pieces.For the channel, the _specifications_ areCP2100A- bandwidth DC~800KHz- rise time ≤583nsCP2100B- bandwidth DC~2.5MHz- rise time ≤175nsSignal delay is same for both - <150ns (10A); <200ns (100A).

author: 2N3055
author_rank: Super Contributor
timestamp: February 24, 2020, 07:36:10 pm
content: Quote from: mnsergey on February 24, 2020, 05:12:53 pmDear Sergey, English is foreign language to me too. I was commenting more on my own capability to understand than your English skills...I merely pointed out that measuring delay doesn't help. Scope built in risetime measurements are more than enough.I was talking about current probe CP22100B and how you measured time delay and not the risetime.Later you started talking about DP20003.As far as DP20003 goes, it seems to slow.Even if your signal generator has "only" 9 ns risetime, you can verify if your probe has 3.5 ns risetime. You don't need 100ps edge generator.Risetimes add as RMS. So siggen 9ns squared + probe 3.5 ns squared and than square root of that sum. That gives 9,6566 ns risetime. So basically, you have to have less than 10 ns risetime. A bit more, actually, counting in the scope's own risetime.My 1GHz scope shows risetime to be 9,6 ns (combination of Rigol DG1067Z and DP20003 into Keysight MSOX3104T)I tried with and without termination resistor, and apart from less resonances on top ( and amplitude difference) there was not much of a difference between terminated or not.All included, your probe shows too slow risetime at 16,9 ns.

author: mnsergey
author_rank: Contributor
timestamp: February 24, 2020, 10:45:54 pm
content: Dear 2N3055,all you say is true, but only for a quality device.I showed You the screenshots for the Chinese deviceI specifically duplicated the time measurement using the frequency method.The 25 MHz bandwidth I received for this probe only confirms that the device does not meet the stated parameters.It's funny that a support Micsig formally evading (for CP2100B) literally: "it is impossible to measure Rise Time, probe Rise Time if the source signal is equal to or greater than this time probe".After these words I slid under the tableIt would have been easy if it was an accident, but I got hit twice:With an interval of approximately one week: first CP2100B and then DP20003;So I decided that I will spend some time, but I will make a good anti-advertising for devices produced under the brand of this manufacturer on several reputable sites.What is remarkable if you go towww.micsig.euthen you will not find any CP2100A, CP2100B, DP10013, DP20003;Think about it, why did Micsig create such an injustice for Europe ?And finally, - read the support response from our Chinese comrades...As they say: I have no more questions!

author: 2N3055
author_rank: Super Contributor
timestamp: February 25, 2020, 08:01:54 am
content: @mnsergey I am sorry to hear you have such problems.I have 2 Micsig DP10013 and they both work well. Bought in EU (Batterfly, Italy).Screenshot I uploaded in previous post shows it is working up to spec.Did you get it from official Micsig shop? If yes, their behaviour is unacceptable...I hope you sort it out.Best regards,Sinisa

author: nctnico
author_rank: Super Contributor
timestamp: February 25, 2020, 11:45:19 am
content: Quote from: mnsergey on February 24, 2020, 10:45:54 pmA lot of the .EU websites are not official. Micsig isn't an exception. Click on 'contact' and you get directed to a different website from a company which sells tools for car diagnostics.I'd like to give the current probe a try myself but the last thing I need right now is to buy another current probe.

author: mnsergey
author_rank: Contributor
timestamp: February 25, 2020, 01:27:22 pm
content: to 2N3055no, both products (CP2100B and DP20003) I bought NOT in the official store, but both packages have a certificate from Micsig with the serial number, which confirms the manufacturer. You have already read the support response. Of course we'll figure it out. But let me and others have a lesson.Now I will only make purchases in the official store, and I will require a measurement sheet from them. By the way, all serious manufacturers by default put the measuring sheet in the box with their products. Micsig apparently considers this optional.to nctnicowill look forward to more detailed tests of your CP2100B.by the Way, I wrote to Elrshop that I am ready to buy this product from them, but my condition is that they must conduct tests for compliance with the parameters declared by the manufacturer and issue a measurement sheet. They replied that they are ready to conduct such a test. Interestingly, we'll see what happens in the end.

author: nctnico
author_rank: Super Contributor
timestamp: February 25, 2020, 01:53:54 pm
content: Quote from: mnsergey on February 25, 2020, 01:27:22 pmTo be clear: I'm not going to buy a CP2100B.

author: Ivan7enych
author_rank: Regular Contributor
timestamp: February 25, 2020, 09:15:01 pm
content: I don't see any issues with bandwith or rise time of DP20003Here passive 500mhz probe and DP20003 both connected to one square wave source.

author: gregb
author_rank: Newbie
timestamp: February 26, 2020, 02:25:18 am
content: I've done another test, this time with 50ohm directly across the 50ohm output of my siggen. Attached is the basic setup directly attached to the siggen, and the test/output waveform.The test is a single shot of a 2.5MHz square wave with 25% duty cycle, so we can see the delay and rise time. Measuring current we have the CP2100B on its 10A range. 2.5MHz is the limit of this probe's specification. Yellow = input square wave and blue = current probe output.The oscilloscope probe measuring the voltage has been compensated. Overshoot is likely from my siggen, which while beloved is basically an antique and has significant jitter at 2.5MHz. The display is a single shot.From this the rise time looks to be sub 100ns - in fact probably around 80ns - so within spec. Delay looks to be about 150ns, assuming no cycles are skipped. So this is ok with respect to the specs as far as I can tell.I'll do a frequency response when I have a moment.@mnsergey does this line up with what you'd hope to see?

author: Ivan7enych
author_rank: Regular Contributor
timestamp: February 26, 2020, 12:12:11 pm
content: Quote from: gregb on February 26, 2020, 02:25:18 amCan you repeat the same test with lower frequency, for example 100KHz? It's hard to estimate rise time when current probe signal has no flat top at all.

author: gregb
author_rank: Newbie
timestamp: February 26, 2020, 01:04:36 pm
content: Quote from: Ivan7enych on February 26, 2020, 12:12:11 pmSure - see attached. Rise time estimates in these shots are 98ns and 102ns, but the waveform's noisy and the acquisition's not perfect, so would be fair to say around 150ns. Note also there's some crosstalk from the source voltage waveform.Fixed the jitter problem, also note the duty cycle in this and my previous post was 20%, not 25%.

author: mnsergey
author_rank: Contributor
timestamp: February 27, 2020, 12:34:45 pm
content: Quote from: Ivan7enych on February 25, 2020, 09:15:01 pmWhich color of the beam is the 500MHz probe, and which color is the differential probe from Micsig?What is the delay of the original probe according to the specification?What is the price of dividing the oscilloscope along the time axis

author: mnsergey
author_rank: Contributor
timestamp: February 27, 2020, 12:53:58 pm
content: Quote from: gregb on February 26, 2020, 02:25:18 amThanksAlthough the signal is very noisy, but I see the Time Rise (blue) a little less than two cells of 100ns, time is about (150-175) nS, which is within the limits stated in its specification for the CP2100B product by the manufacturer.I congratulate You, You have a normal, within tolerance current probe. I was less fortunate.

author: Ivan7enych
author_rank: Regular Contributor
timestamp: February 27, 2020, 01:30:43 pm
content: Quote from: mnsergey on February 27, 2020, 12:34:45 pmyellow - 500MHz passive probe, you see on picture 1:10 division ratioblue - DP20003 (1:200 division ratio ), invertedAlso averaging is applied to remove noiseI don't care about delay - it's adjustable parameter inside scope, and it depends on probe cable lengthtime scale is 10ns / division

author: mnsergey
author_rank: Contributor
timestamp: February 27, 2020, 02:09:12 pm
content: More accurately measured the DP20003 frequency band.method: for X200, I connect the generator output to C1, the probe to C2.The generator costs 1 MHz. The output of the probe is an AVERAGE of 9.13 mV rms.The limit frequency of the probe will be considered when the level is reduced by -3dB,or 9.13*0.708=6.46 mV rms. I found this frequency. This happens on 28.3 MHz.http://skrinshoter.ru/s/270220/ep4k3FXh?ahttp://skrinshoter.ru/s/270220/AIJ7imS0now it's the same on the X2000 multiplier.at the output of the 3V rms generator,at the output of the 1.61 mV rms probe.-3 dB will: 1.61*0.708=1.105 mV rms.This occurs at a frequency of 20 MHz.http://skrinshoter.ru/s/270220/xqWTqKfWhttp://skrinshoter.ru/s/270220/eYYxdxu4There may be some errors here, since the output signal of the probe is very small and quite noisy.Noise level no more than 1.25 Vpp (x2000).We see that the increase in the frequency band at the upper limit x2000 does not occur,as some comrades assumed.

author: mnsergey
author_rank: Contributor
timestamp: February 27, 2020, 06:24:09 pm
content: By the way,I searched on Ebay..., and did not find a single seller who would offer CP2100B, but a lot of CP2100A, about the same picture on Ali. Only the official Micsig offer, and a couple of sellers are ready to put everything.Some kind of conspirology

author: eurofox
author_rank: Unknown
timestamp: February 27, 2020, 09:12:38 pm
content: This one got the 2 units:https://www.eleshop.nl/catalogsearch/result/index/?p=2&q=micsig

author: mnsergey
author_rank: Contributor
timestamp: March 01, 2020, 07:38:55 pm
content: Yes, I'm in correspondence with them.This topic intrigued them.For a short time, they promised to conduct tests in their laboratory on their own.Micsig-silent as a fish on ice.

author: Micsig_support
author_rank: Regular Contributor
timestamp: March 02, 2020, 07:18:04 am
content: Hi everyone, Something wrong with my account, and i did not notice it before.Due to Coronavirus, we just back to work recently. sorry to miss so many messages.I will try to my best to reply the question.

author: mnsergey
author_rank: Contributor
timestamp: March 14, 2020, 12:54:17 pm
content: Micsig checked in , but there is no specifics. Well, this is the specifics of the support work.So, some news:at my request, Eleshop Customer Service conducted their own CP2100B test. They conducted a test to measure the frequency response, but there is one caveat: the tests were performed at a very low current. They can't run tests on Rise Time at a current close to the nominal value.With their kind permission, they allowed their report to be published .literally (not advertising):QuoteI will allow myself to comment on this based on my own experience:QuoteNot always, and not for everyone

author: Martin72
author_rank: Super Contributor
timestamp: March 15, 2020, 07:44:22 pm
content: I wonder if the CP2100B got current compensating ?edit:Quoteprobably not..