Author Topic: New low-cost ($170) 100MHz Differential scope probe from Micsig  (Read 40578 times)

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Offline mk_

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #200 on: February 11, 2019, 06:20:36 am »
...so I finally got around to cutting off ~20cm of lead length on one my DP10013 probes. I haven't done any proper measurements of the new frequency response after the mod, but it sure did make an improvement regarding ringing!

It is a well known secret that leads for oscilloscope-probes should be "resistive" wires for damping ringing. There is an old AN from Tektronix somewhere on the net which demostrates this. In the - also old - AN called "TekProbeCircuits" you can see some resistor in the signalpath for damping this ringing (Rs on p18, Fig. 2-10)
 

Offline Hydron

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #201 on: February 11, 2019, 07:35:53 am »
Yes agreed - this (combined with the longer than usual length) is why some people including myself earlier in the thread were dubious about the design before anyone even did any measurements. But the price was right (even for the more accurate ~50MHz of bandwidth you get without the lead peaking) so I went for a couple anyway.

This issue is certainly not confined to the Micsig probe - most models of differential probe in this style have non-resistive leads, and I suspect the only reason they get away with it is that their response doesn't reach high enough to see the undamped ringing. There is a certain discontinued fluke model (DP-120?) that has resistive input leads forming part of the attenuation circuit but sadly it is limited to a fairly low 20MHz bandwidth.
 

Offline mk_

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #202 on: February 11, 2019, 07:50:48 am »
Yes agreed - this (combined with the longer than usual length) is why some people including myself earlier in the thread were dubious about the design before anyone even did any measurements. But the price was right (even for the more accurate ~50MHz of bandwidth you get without the lead peaking) so I went for a couple anyway.

This issue is certainly not confined to the Micsig probe - most models of differential probe in this style have non-resistive leads, and I suspect the only reason they get away with it is that their response doesn't reach high enough to see the undamped ringing. There is a certain discontinued fluke model (DP-120?) that has resistive input leads forming part of the attenuation circuit but sadly it is limited to a fairly low 20MHz bandwidth.

Switching from 0 to 600V in 30-40ns results in a lot of ringing with the original leads at my Testec SI 9110 (1:100(0), 100Mhz, 1,4kV)  so I replaced those leads with some from a broken Tek. It`s a filigrane construction but anyway... bandwith remaind the same but no more ringing.
 

Online nctnico

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #203 on: February 11, 2019, 07:51:17 am »
From my own measurements it seems that the DP10013 works best with the original lead lengths. I assume MicSig factored in the capacitance between the leads (when twisted) into the frequency response.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline SteveyG

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #204 on: March 28, 2019, 09:15:08 pm »
I missed this thread  :palm:

I posted a video recently about this differential probe and will be using it in some upcoming videos, but I did want to comment that having used this on my bench for the past week or so it actually works really well and in my opinion can't be beaten in terms of value for money.

https://www.banggood.com/custlink/33G3Jmr8bC
Coupon code: "aff7off" brings it down to around £120 delivered, which IMO is a bargain

Here's my video if anyone is interested:

Offline frozenfrogz

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #205 on: March 28, 2019, 10:15:09 pm »
You do not need to go through the trouble of importing from China. Buy via ebay.co.uk from Germany for less than £100 delivered. :)
He’s like a trained ape. Without the training.
 

Offline SteveyG

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #206 on: March 28, 2019, 10:50:39 pm »
Doesn't show up for me anything like that on ebay for the UK. Thanks for the info though  :-+

Offline frozenfrogz

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #207 on: March 28, 2019, 10:54:30 pm »
He’s like a trained ape. Without the training.
 

Offline SteveyG

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #208 on: March 28, 2019, 11:09:39 pm »
They're a bit naughty with the listing, it's being shipped from Singapore to the UK warehouse then on to you to avoid customs charges.

Offline frozenfrogz

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #209 on: March 29, 2019, 02:20:56 am »
They're a bit naughty with the listing, it's being shipped from Singapore to the UK warehouse then on to you to avoid customs charges.

Well sure, this was just the first listing I found, when switching my "location" to UK. Anyway, all those devices somehow have to make their way from China to the EU (or thereabout xD) and as long as the seller takes care of that, it is fine with me - it is still 110 € delivered without having to deal with DHL Express / customs / ...
I have been prancing around one of these for quite some time and now seems a good time to finally buy one - thanks for reminding me. :)

Edit: On ebay.de there are a bunch of listings from the same seller. Same price, but the listing quotes "DP10013 EDQ", "DP10013 LY", "DP10013 EAv",... Are these just identifiers from the seller per listing or are there several different versions available? I am a bit confused. Micsig website does not help here. 
« Last Edit: March 29, 2019, 02:23:39 am by frozenfrogz »
He’s like a trained ape. Without the training.
 
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Offline SteveyG

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #210 on: March 29, 2019, 02:26:14 am »
They're a bit naughty with the listing, it's being shipped from Singapore to the UK warehouse then on to you to avoid customs charges.

Well sure, this was just the first listing I found, when switching my "location" to UK. Anyway, all those devices somehow have to make their way from China to the EU (or thereabout xD) and as long as the seller takes care of that, it is fine with me - it is still 110 € delivered without having to deal with DHL Express / customs / ...
I have been prancing around one of these for quite some time and now seems a good time to finally buy one - thanks for reminding me. :)

Edit: On ebay.de there are a bunch of listings from the same seller. Same price, but the listing quotes "DP10013 EDQ", "DP10013 LY", "DP10013 EAv",... Are these just identifiers from the seller per listing or are there several different versions available? I am a bit confused. Micsig website does not help here.

I think those are nothing to do with the part numbers, just some weird thing the person listing it is doing. I quite like using Banggood as they also deal with the import duty and actually sort out any problems with an order.

Offline MiroS

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #211 on: March 29, 2019, 03:39:03 am »
I quite like using Banggood as they also deal with the import duty and actually sort out any problems with an order.

I do not think that this 'like'  can justify 30 USD more  or so :)  Especially that this maybe 30 usd more on  top of custom  and VAT.
 

Offline Housedad

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #212 on: March 29, 2019, 07:48:45 am »
I'm going to try adding resistors to the leads and see what happens with my MSIG probe.  I was reading about this on the Keysight paper http://literature.cdn.keysight.com/litweb/pdf/5992-2848EN.pdf  Starting on page 8.
At least I'm still older than my test equipment
 

Offline joesmith

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #213 on: March 29, 2019, 05:40:52 pm »
I missed this thread  :palm:

I posted a video recently about this differential probe and will be using it in some upcoming videos, but I did want to comment that having used this on my bench for the past week or so it actually works really well and in my opinion can't be beaten in terms of value for money.

https://www.banggood.com/custlink/33G3Jmr8bC
Coupon code: "aff7off" brings it down to around £120 delivered, which IMO is a bargain

Here's my video if anyone is interested:


This looks really nice
 

Offline exe

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #214 on: March 29, 2019, 05:59:15 pm »
I quite like using Banggood as they also deal with the import duty and actually sort out any problems with an order.

Are you sure about this? Last time I used banggood (about 2 years ago or so) it was explicitly mentioned that import tax and duties are on the buyer. They even used to have "tariff insurance": https://blog.banggood.com/banggood-tariff-insurance-61604.html .Also, I see they say explicitly on their website that they do not manager import taxes and duties: https://www.banggood.com/Taxes-and-tariffs_hl69_at310
 

Offline SteveyG

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #215 on: March 29, 2019, 06:12:31 pm »
I quite like using Banggood as they also deal with the import duty and actually sort out any problems with an order.

Are you sure about this? Last time I used banggood (about 2 years ago or so) it was explicitly mentioned that import tax and duties are on the buyer. They even used to have "tariff insurance": https://blog.banggood.com/banggood-tariff-insurance-61604.html .Also, I see they say explicitly on their website that they do not manager import taxes and duties: https://www.banggood.com/Taxes-and-tariffs_hl69_at310

Any order over the duty threshold with the insurance appears to go to a warehouse just near Heathrow Airport, and is then delivered by Yodel as a UK shipment. They have to put the warning on the website though I would assume.

If you use the link: https://www.banggood.com/custlink/33G3Jmr8bC Banggood have offered the discount code "DP10013" to drop the price to $139.99 delivered.

Online BravoV

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #216 on: March 29, 2019, 06:41:06 pm »
If you use the link: https://www.banggood.com/custlink/33G3Jmr8bC Banggood have offered the discount code "DP10013" to drop the price to $139.99 delivered.

Actually you can get < $130 s/h included at Aliexpress with shop that sold many of it with good many feedbacks too, just fyi.

Offline SteveyG

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Re: New low-cost ($170) 100MHz Differential scope probe from Micsig
« Reply #217 on: May 22, 2019, 04:20:07 pm »
If anyone is interested, you can see the innards of the DP20003 in this short video. Micsig have increased the quality of the accessories in all new models so worth checking if it's new stock if you happen to order:



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