Micsig CP1003/CP503 100MHz/50MHz Current Probe

[nimish]

Any luck getting these probe for the nice price ?

I've just asked again for the sample.

They got back to me. The R&D team are all working on the isolated probe and have no time to finish the current probe  so there will be delays.
Sounds like they think the isolated fibre optic probe will overtake the traditional high voltage probe, they want to know if I'm interested in getting one.

If you can sell it for less than $10000 yeah. IsoVue probes are not cheap to replace...

[mawyatt]

Any luck getting these probe for the nice price ?

I've just asked again for the sample.

They got back to me. The R&D team are all working on the isolated probe and have no time to finish the current probe  so there will be delays.
Sounds like they think the isolated fibre optic probe will overtake the traditional high voltage probe, they want to know if I'm interested in getting one.

This optical probe probably has much more potential $ ahead, so that's where the emphasis goes!!

Get one if you can, that would be interesting to see what they've done. Wonder if they've found a way to pump enough optical power back up the fiber to power the head?

Best,

[mk_]

This optical probe probably has much more potential $ ahead, so that's where the emphasis goes!!

Get one if you can, that would be interesting to see what they've done. Wonder if they've found a way to pump enough optical power back up the fiber to power the head?

 

We probed a shunt riding on a 25kHz 700V Output (square, not sinus) with an early https://saker-mv.com/fiber-optic-isolated-voltage-probe-xfvp-l/ . This worked fine so - there are cheaper and also working solutions which are not soooo expensive as those from Textronix.

btw: somewere in the X-Chapters a detailed description for this optical probes from Tek can be found.

[nimish]

This optical probe probably has much more potential $ ahead, so that's where the emphasis goes!!

Get one if you can, that would be interesting to see what they've done. Wonder if they've found a way to pump enough optical power back up the fiber to power the head?

 

We probed a shunt riding on a 25kHz 700V Output (square, not sinus) with an early https://saker-mv.com/fiber-optic-isolated-voltage-probe-xfvp-l/ . This worked fine so - there are cheaper and also working solutions which are not soooo expensive as those from Textronix.

btw: somewere in the X-Chapters a detailed description for this optical probes from Tek can be found.

It's a little ridiculous honestly. Makes one want to try to DIY a probe using https://docs.broadcom.com/doc/AFBR-POCxxxL-DS or something. I'd rather spend $3000 than $7500+ to get isolated HV gan/sic measurements

[Alphaprot]

I am still wondering how MicSig is going to justify the almost 2x price difference between the BNC and the UPI version which at least to the datasheet/catalog page and the CP1003/CP503 manual is indistinguishable performancewise. This makes no real sense to me other than forcing people onto your scope platform.

[Martin72]

Or let me think about what´s in the box...
Batronix still doesn´t offer them.

[EEVblog]

This optical probe probably has much more potential $ ahead, so that's where the emphasis goes!!
Get one if you can, that would be interesting to see what they've done. Wonder if they've found a way to pump enough optical power back up the fiber to power the head?

They contacted me again recently, one is apparently on the way.

[Bran Zhu]

I just received CP253B today, the 25MHz version of this series. Micsig sold it at RMB3900(USD560) with tax in china. This is much cheaper then the 50MHz version, CP503B is listed at RMB12900(USD 1865).

Maybe you can also consider this model.

[Durong]

Are you the person who posted the comparison with the Tektronix probe under their review section?
The 50M version cp503b in Australia is around 5000 CNY after tax, half the price of their direct sale on Taobao.

[gossamer]

I wonder if cp503 would work with this upi to bnc adapter. Or is there something else significantly different between 503 and 503b ?

[Martin72]

Short review:

[Someone]

Short review:

Much more than "short" ! the video has a very nice mixture of examples and discussing those back to the specifications. Noise performance is impressive for such low cost.

[Martin72]

Much more than "short" !

Yepp...

Noise performance is impressive for such low cost.

Unfortunately batronix still didn´t have the probes on their site listed - Otherwise I would ask them for a sample to test, like I did in february(Rigol DHO4024).
I would like to compare the micsig with my tek probe(A6302/AM502A), I like the tek much but it needs sooo much space on the desk....

[dirtcooker]

I wonder if cp503 would work with this upi to bnc adapter. Or is there something else significantly different between 503 and 503b ?

The spec sheet says it needs 12v. Perhaps a modified upi adapter would work. Does anyone have one of these to test?
Also, the B versions require 5v 3A, so these probes are rather power hungry.
I probed voltages on the upi adapter from my RCP500 and found supply voltages across the top row of pins.

[dirtcooker]

I recently bought a Micsig RCP500. This is a 500A rogowski ac current probe good to 300 khz, perfect for measuring phase currents on inverters, heat pumps and motor drives, and is portable and more convenient to use than my Tek probes. It pulls only 8 ma from a 5v USB jack so can be used with a battery pack.  I did a couple tests on it which I will summarize here.  The first using a deskew fixture, RCP500 is the blue trace, tek A6302 green, response to 150 ma pulse, both channels adjusted to 500ma per div. Note there are high levels of noise in the scope traces as I am in the city near radio transmitters.

The second test is measuring drain current in a double-pulse test setup using two FGH60N60 IGBT's in a half bridge, with a 150 uH air core coil from drain to source of top IGBT. A Siglent SDG2042 with outputs summed controls the pulse train. 10 Hz rep rate is well below the RCP500's 15 hz -3 db roll off but even so there is no noticeable droop. It has about 2 us delay, and is not fast enough for estimating IGBT switching losses, but is reliable for measuring locked rotor amps without worrying about probe saturation.

I just bought a second one on sale for $100
https://www.sainsmart.com/products/micsig-rcp500-rogowski-ac-current-probe-300khz-with-standard-bnc-interface

[DaneLaw]

I wonder if cp503 would work with this upi to bnc adapter. Or is there something else significantly different between 503 and 503b ?

The spec sheet says it needs 12v. Perhaps a modified upi adapter would work. Does anyone have one of these to test?
Also, the B versions require 5v 3A, so these probes are rather power hungry.
I probed voltages on the upi adapter from my RCP500 and found supply voltages across the top row of pins.

I don't know what ampere it uses in practice, as I havent tested it, but Micsig's official power specs, some of those should be taken with a pinch of salt, at least in the past.
I recall somebody looking for a PSU for their Micsig-tablet-scope's, and was hard-set on matching Micsigs official PSU 12v/5.417A (65watt) https://tinyurl.com/6zkhze47
though these scopes are not anywhere close to using that, it's under 50% of that, around 25W "charging" and around 30W "in use & charging" and the org Micsig PSU was somewhat noisy.  https://tinyurl.com/3v5v6a47
I don't use the incl PSU with my Micsig scope, just use power banks with PD 12v support, and with a TypeC to DC barrel decoy-adapter.
But I do recall that Micsig indicating the "B-variant" for their Micsig-scopes without Micsig's new proprietary prope-interface and gave the impression it could be run from the scopes USB, and the USB-port in all these Micsig-scopes are not able to deliver anywhere around 5V-3A, not even half when I run the secondary display from it and had to dial down the brightness..https://tinyurl.com/24hn9rcw

[LTXAPAS]

I wonder if cp503 would work with this upi to bnc adapter. Or is there something else significantly different between 503 and 503b ?

The spec sheet says it needs 12v. Perhaps a modified upi adapter would work. Does anyone have one of these to test?
Also, the B versions require 5v 3A, so these probes are rather power hungry.
I probed voltages on the upi adapter from my RCP500 and found supply voltages across the top row of pins.

Has anybody tested the CP503 with the accessory in a normal oscilloscope? (using the right voltage)...

[gossamer]

Seems like UPI ones are now discontinued according to the Micsig website.. whats that about?

CP1003 / CP503 (Discontinued)

B versions are still on the market

[DaneLaw]

Seems like UPI ones are now discontinued according to the Micsig website.. whats that about?

CP1003 / CP503 (Discontinued)

B versions are still on the market

Micsig seems to end' its "Universal Probe Interface" (UPI)
I reckon they had hoped that other vendors would jump on board on their UPI standard, and later realized it would be a task to operate with two somewhat proprietary probe interfaces for a relatively small international vendor like Micsig.
As they had both their "UPI probe interface" and their "OPI probe interface"
The only scope models, I so far have seen Micsig OPI-sockets on - are their ETO-model & their coming MDO-line. https://www.eevblog.com/forum/testgear/new-micsig-scope-with-knobs-(again)/msg4854149/#msg4854149
-
UPI [Universal Probe interface]




Mic-OPI [SigOfit..)

[Martin72]

Seems like UPI ones are now discontinued according to the Micsig website.. whats that about?

CP1003 / CP503 (Discontinued)

B versions are still on the market

And one shop offers the Non-B probe for 41% off...

https://evision-webshop.de/micsig/cp503-strommesssonde

344€ incl. VAT/486€ for the CP1003....

[amar87]

I bought a CP1003B. In case someone is interested i could do some experiments and post the results. After all the things i learned from this forum is the least i can do.

[Martin72]

Do it please...
Noise, bandwith, accuracy....

[amar87]

I am not sure how to measure the noise from it. I could plug it in the scope and change the ranges and see the peak to peak and the RMS values. I would maybe need some help ony hwo to conduct the experiements, i guess out of all of this i could learn a thing or two as well. 

For DC a could compare it with a 6 1/2 multimeter to determine the accuracy.

For AC i have acces to a calibrated AC current source i have to see when i can use it. But it can do 40...60 Hz or someting like that. 

To determine the bandwith i have a RIGOL 100 Mhz DG4102 I guess i could i could short the output into 50R or something and see where the rolloff occurs but i guess with this the onyl thing i could find out is if the  the bandwidth would be under 100 Mhz.

Would also approciate some pointers as i never really qualified a current probe before. Some 'pre-experiment feedback' would be appreciated.

[amar87]

So i am not sure if what i did is super correct but here it goes :

Test setup for noise measurement:

- Siglent scope SDS2104X 
- 200 Mhz Bandwidth - this made sense to me since the current probe is 100 Mhz
- Pressed the 'ZERO' button on the probe
- Enabled the measurement function on the scope to show RMS, Mean,   Peak to Peak and the Stdev measurement which i think but not 100% sure is the RMS without the DC component and the RMS contanints the DC component
- no cable through the loop.

This is what i can measure with the probe on the 6A range: 



This is what i can measure on the 30A range:




Test Setup for Accuracy 6 A range :

- same as above + the following:
- DC electronic load
- Fluke 8846A Multimeter (not calibrated)
- DC power supply   





Test Setup for Accuracy 30 A range :

same as 6A range   




I am not sure how to interpret the ±10mA（6A) after the ±1%±10mA（6A) (spec from datasheet) maybe the experts can help here. I guess if i would take out the 10 mA somehow from the readings the probe  could be in spec

[Martin72]

Hi,

Here are links to the probes I´ve tested (and other users in the thread):

https://www.eevblog.com/forum/testgear/tek-clone-instrance-icp-5025-current-probe/msg3366960/#msg3366960

In this thread I´ve tested the bandwith of a currentprobe via bodeplot:

https://www.eevblog.com/forum/testgear/micsig-current-probe-cp2100b-tests-and-comparing/msg3072460/#msg3072460

May I ask what you´ve paid for the micsig probe?