Author Topic: EEVblog HVP70 Differential Probe  (Read 47208 times)

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Online EEVblog

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EEVblog HVP70 Differential Probe
« on: March 10, 2017, 08:17:47 am »
Looks sweet!

 

Online JPortici

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Re: EEVblog HVP70 Differential Probe
« Reply #1 on: March 10, 2017, 08:22:47 am »
.. Do i even have to say it?

Take it apart ;D
 

Offline tautech

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Re: EEVblog HVP70 Differential Probe
« Reply #2 on: March 10, 2017, 08:26:27 am »
Clips and grabber options ?
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Re: EEVblog HVP70 Differential Probe
« Reply #3 on: March 10, 2017, 08:31:37 am »
Clips and grabber options ?

Just the standard hooks. BYO isolated banana to whatever
 

Offline tautech

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Re: EEVblog HVP70 Differential Probe
« Reply #4 on: March 10, 2017, 08:38:18 am »
Clips and grabber options ?

Just the standard hooks. BYO isolated banana to whatever
So shown are grabber hooks ?
Like scope probe hooks ?

They look pretty fine, what size mm wire will they grab ?
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Offline alanb

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Re: EEVblog HVP70 Differential Probe
« Reply #5 on: March 10, 2017, 08:48:13 am »
Is it available yet?
How much does it cost?
 

Online EEVblog

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Re: EEVblog HVP70 Differential Probe
« Reply #6 on: March 10, 2017, 09:00:21 am »
So shown are grabber hooks ?
Like scope probe hooks ?

Yes.

Quote
They look pretty fine, what size mm wire will they grab ?

Large stuff, they aren't fine. Maybe 1.5sqmm
 

Online EEVblog

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Re: EEVblog HVP70 Differential Probe
« Reply #7 on: March 10, 2017, 09:00:58 am »
Is it available yet?
How much does it cost?

A few weeks.
How much would you pay?
 

Offline capt bullshot

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Re: EEVblog HVP70 Differential Probe
« Reply #8 on: March 10, 2017, 09:24:43 am »
How much would you pay?

I've taken apart and re-adjusted the attenuator compensation and CMRR of such a thing (apparently something in the input divider changed its behaviour over usage and time). Regarding what is inside, all commercially available probes of this kind are heavily overpriced IMO. I think it should be less than 180 Euros.

Does yours run on ext. power supply? (Batteries have a strong tendency to be maximum empty when needed most urgent)
Safety devices hinder evolution
 

Online EEVblog

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Re: EEVblog HVP70 Differential Probe
« Reply #9 on: March 10, 2017, 09:27:22 am »
I've taken apart and re-adjusted the attenuator compensation and CMRR of such a thing (apparently something in the input divider changed its behaviour over usage and time). Regarding what is inside, all commercially available probes of this kind are heavily overpriced IMO. I think it should be less than 180 Euros.

Market niche for you then, go for it.

Quote
Does yours run on ext. power supply? (Batteries have a strong tendency to be maximum empty when needed most urgent)

Yes, both external and batteries.
 

Offline tautech

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Re: EEVblog HVP70 Differential Probe
« Reply #10 on: March 10, 2017, 09:39:42 am »
Hmmm, looks like similar specs to Sapphire.  :-//
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Online BravoV

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Re: EEVblog HVP70 Differential Probe
« Reply #11 on: March 10, 2017, 09:42:14 am »
Curious is that the old thru hole design ? or newer using smd ?

Offline djnz

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Re: EEVblog HVP70 Differential Probe
« Reply #12 on: March 10, 2017, 10:22:51 am »
Neat!
 

Offline bitwelder

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Re: EEVblog HVP70 Differential Probe
« Reply #13 on: March 10, 2017, 10:44:54 am »
Nice!

What certifications will it have?
 

Offline TheAmmoniacal

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Re: EEVblog HVP70 Differential Probe
« Reply #14 on: March 10, 2017, 11:16:51 am »
Hmmm... $600 AUD? Stretch it down to 500?
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Offline TheAmmoniacal

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Re: EEVblog HVP70 Differential Probe
« Reply #15 on: March 10, 2017, 11:20:59 am »
Hmmm... $600 AUD? Stretch it down to 500?

Guess I was in the range: https://www.amazon.com/gp/aw/d/B06XHYMP7D/

$399 USD

EDIT: Dave made it unavailable, so he's still just dicking around with Amazon and probably still undecided on the price.
« Last Edit: March 10, 2017, 11:48:48 am by TheAmmoniacal »
I collect [corporate] mugs.
MTBF ~ 700.000 h
 

Online BravoV

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Re: EEVblog HVP70 Differential Probe
« Reply #16 on: March 10, 2017, 11:22:12 am »
Hmmm... $600 AUD? Stretch it down to 500?

Where did you get that number from ?  :o

Offline nctnico

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Re: EEVblog HVP70 Differential Probe
« Reply #17 on: March 10, 2017, 11:33:19 am »
I like the Pintek ones better. You can stick a BNC to banana adapter in those and connect an isolated scope probe. 70MHz through flying leads is pushing your luck way too far.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Online BravoV

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Re: EEVblog HVP70 Differential Probe
« Reply #18 on: March 10, 2017, 11:44:29 am »
70MHz through flying leads is pushing your luck way too far.

I guess that for "young players" ...  >:D

Offline joeqsmith

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Re: EEVblog HVP70 Differential Probe
« Reply #19 on: March 10, 2017, 12:10:49 pm »
Dang, I should have entered the giveaway when I fill out the questionnaire.   Looks nice. 
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline amspire

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Re: EEVblog HVP70 Differential Probe
« Reply #20 on: March 10, 2017, 12:14:23 pm »
Pricing depends on who you want to sell to. If you are working with Mains and switching power supplies, these can be your best friend - worth every bit of $600 if it is good.

I would really love to see how this goes connected to the gate circuit in a high side mosfet in a switching supply. If you can actually see the gate waveform fairly accurately, that would be impressive. Any specs on common mode rejection ratio at various frequencies?

For selling to hobbyists, I think a US$100 price would sell 10 times more then US$200 and so it comes down to how much they cost to build. I know there is nothing like this on the market at these kind of prices, and the only reason to go there would be to sell in quantity and because you have managed to use economical components.

Definitely at $400, there would be a decent professional market. There are 25MHz probes with 1300V DC + peak AC for about US$230. They will not be as good, but they are an option if you are on a budget.
 

Offline capt bullshot

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Re: EEVblog HVP70 Differential Probe
« Reply #21 on: March 10, 2017, 12:48:54 pm »
I would really love to see how this goes connected to the gate circuit in a high side mosfet in a switching supply. If you can actually see the gate waveform fairly accurately, that would be impressive. Any specs on common mode rejection ratio at various frequencies?
The people here use these probes (Yokogawa brand labeled, 100MHz BW spec) to monitor gate drive signals on high side IGBTs, common mode is up to 800V and up to a some kV/us (well, it depends, can't go into details). And yes, they can see a gate drive signal.

There's also a downside: no one checks the probes for compensation and CMRR, not even when they get calibrated in a external cal lab :-(
It's perfectly possible to pull a probe out of the storage box with a fresh cal sticker on it and real bad compensation / CMRR. Some months ago, I volunteered an re-adjusted a bunch of them - again no one noticed the change.
The probe simply is used to measure and document the gate signals, no matter if they are misread by bad compensation or CMRR.

I really like these probes, even if I don't need the high safety ratings (other people here need that), but when it comes to real perfomance, it's better to have your own that has never been used by the power people and lab rats before - they simply do not take care of their equipment.

BTW, the probes I re-adjusted have standard SMT components (1206 planar resistors and caps) for the high voltage divider (several components in series). That's quite cheap ass style, yes it works as long as you don't treat them with high dV/dt rates and you don't have high voltage transients. The standard resistors and capacitors degrade slowly over time (and change their values) if you treat them this way (which is well within their safety ratings, no specs exceeded), leading to bad compensation and CMRR. Then one says, they are worth each dollar they cost - yes maybe in terms of safety they provide, but no, not in terms of performance and long time stability I do expect from such an expensive accessory.

Safety devices hinder evolution
 

Offline alanb

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Re: EEVblog HVP70 Differential Probe
« Reply #22 on: March 10, 2017, 01:17:59 pm »
Is it available yet?
How much does it cost?

A few weeks.
How much would you pay?

It would be for occasional hobby use, on that basis I wouldn't want to spend more than about £50.
 

Offline MrW0lf

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Re: EEVblog HVP70 Differential Probe
« Reply #23 on: March 10, 2017, 01:32:29 pm »
Quick teardown?  :-/O
 

Offline TheSteve

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Re: EEVblog HVP70 Differential Probe
« Reply #24 on: March 10, 2017, 10:57:20 pm »
Looks good, but you were supposed to announce it before I bought an Agilent N2891A(70 MHz 7 kV).
« Last Edit: March 11, 2017, 08:10:48 pm by TheSteve »
VE7FM
 


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