Measurement Block PCB

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  • Last Post 20 October 2021
Chris posted this 02 March 2020

My Friends,

Observing what your Voltage Current is doing in your Machine is super Important, I have said all along, look at your Currents! Your Current is where you get an idea on whats going on!

If you are interested in the Barebones PCB or a Kit, please visit E-Bay for purchase.

I have listed the

Barebones PCB:

  • Just a single PCB, you purchase the parts and build your self.

 

I also have the:

Measurement Block Kit:

  • 2 x two pin terminal blocks.
  • 3 x Matrix PCB Pins.
  • 1 x Through Hole Resistor 0.1 Ohms 1% tolerance.
  • 1 x PCB for mounting the components.

 

This Item has been one of my most useful of all. 5 Watts is the Maximum Power, but please remember if you are using Pulsed DC peak power can be higher. 5 Watts is constant power maximum.

The Resistor is rated as follows:

 

All PCB's are based on the following Circuit:

 

Video Tutorial:

 

If you want to, you can also round the corners of the board for rounded edges. Something I often do.

Best wishes,

   Chris

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Jagau posted this 09 April 2020

Hello Chris
I have just received my measurement block, I have assembled the kit and checked it with my oscilloscope.
It works very well for both voltage and current.
We can see on the scope shot we have a more precise value on the oscilloscope.

That it is the ideal tool for precision, I recommend it as an essential tool in your workshop.

 


Thanks Chris, i am very satisfy

P.S. Dont forget to adjust you probe scope to 1X or 10X multiplicator.


Jagau

Chris posted this 09 April 2020

Hi Jagau,

I agree, they are super handy, very accurate, and they are simple to use.

Thank You for posting this post, I very much appreciate your kind words!

Best wishes,

   Chris

Chris posted this 05 May 2020

My Friends,

I have had a few people say they have not received their kits.

Please let me know if you have not received your Kit - I am happy to re-send if you have not received yours!

Australia post has said that post world wide is slower than normal due to excess items being posted. I ask, please be patient, normally the time to post standard post is between 2 - 3 weeks.

Please let me know if you want to send your kits via Courrier, it is much safer, but also much more expensive. I am happy to change the post type if you want to? 

My Friends, I want to keep everyone happy and make sure you get exactly what you paid for! Please let me know if you have any problems!

I am very sorry about slow post, I cant do anything more on the post side other than offer another service? Please let me know if that's what you would like?

I am also hoping I can get the price down on the Kits, by the time I pay post, purchase items, bag them up and so on, it is surprising how quickly this adds up.

Best wishes and Thank You for your Support! Your'e all the Best!

   Chris Sykes

Zanzal posted this 05 May 2020

I did receive mine. Thanks Chris.

Chris posted this 10 December 2020

My Friends,

After many requests, I have decided to release the Gerber Files here.

Again, this is: "As is, where is, your responsibility, you take them are your own will, I have no responsibility after this download, I give them Freely and it is up to you what you do with them from here."

Please understand, I can not support these things! Too many things can go wrong! I have no control over anything beyond the download.

I simply do not have the time to spend here, on things like this! I am too busy! So, this is at your own risk, own cost, own responsibility.

 

 

In saying this, Everyone else has very much enjoyed these extremely useful tools! Remember, there are always limitations with any Tool!

 

What you will need to know:

Dimensions: 51mm x 61mm

File: .gb0 -  Board outline layer

File: .gb1 -  Bottom copper (solder side) layer

File: .gb2 - Top copper (component side) layer

File: .gb3 - Bottom (solder side) solder mask layer

File: .gb4 - Top (component side) solder mask layer

File: .gb5 - Silk screen (component outline) layer

 

Element14 has 0.1 Ohm Metal Strip Resistor. You need to check, see if it will fit. Please do your own homework on this. I just don't have the time to support these sorts of things.

 

I have used JLCPCB and they are great, just upload the zip file and add the above into the instructions. They need to know what each file is for. Beware the cost, $2 PCB is not what you get because of the size and shipping. Shipping was expensive, so beware of this.

This is given freely, but I take no responsibility from here what you or others do with it. Design V.1.0 is now Public Domain.

Best Wishes,

   Chris

Attached Files

Forushani posted this 22 December 2020

Thank you Chris.

 

Look what Santa dropped off in my chimney.

 

Chris posted this 02 October 2021

My Friends,

Now that most of us are now measuring More Power Output, I want to share a slightly higher rated Measurement Block, 35 Watts Max.

I have shown you in the past, that the selection of a good quality Current Sensing Resistor, CSR, is very important, and shown other good quality Sensing Resistors:

and I have shown this image before also, I have a few of these beauty's:

but the R100 Versions.

Even better CSR's are available, but they can get expensive!

Raivope has posted an Excellent post Here showing the excellent quality of measuring signals with this setup!

Its very easy to see, we have the absolute best Measurement Protocols on the Internet, when it comes to Non-Linear Loads and Machines! So today I am going to share a better Measurement Block:

 

NOTE: A better Measurement Block is on the way, one, as: Raivope, suggested, with BNC PCB Mount Connectors:

I just bought some.

 

I need to test them first, before I share the PCB.

As usual My Friends, Files attached. Have Fun and Enjoy!

Best Wishes,

   Chris

Attached Files

Fighter posted this 02 October 2021

When I bought the Cree/Wolfspeed C2M0160120D-ND MOSFETS I also bought two TEH140M1R00FE-ND:

(link to larger image here)

Just like the ones Chris referred to, mine are also high-frequency, non-Inductive and pulse-withstanding.

Unfortunately I didn't had the occasion to use them as intended yet but they're for measuring higher power even with significant less precision (they're 1 ohm, not 0.001 ohm but they can go up to 140W).

As long as I use identical ones on input and output the COP can be estimated even with less precision.

raivope posted this 03 October 2021

Hi,

I post some close up pics of that BNC current shunt.

You need to have the probe (not direct cable) that has BNC connector (and put it to 1:1), and 0.1R shunt TO220 case.

This combo is relatively cheap, virtually no phaseshift (very important for power metering), and very low noise. You should replicate and check that out.

Best regards,

Raivo

Chris posted this 03 October 2021

Hey Raivo,

Thank You! This is excellent!

The Scope Probe BNC Adapter comes in two different sizes from what I can tell, 3.5mm and a 5mm.

 

Most of the time, if one shops around, they range from around $5:50 to $18:00. Cheaper is better most of the time, as long as the quality is satisfactory!

Another method of Scope Probe Adapter is also available, seen in this video:

 

A very cool and useful Adapter:

 

I like this idea, it needs a nice plastic cover, to make it look a bit more professionally finished. Its awesome, Thanks to the Builder that published the video for sharing this excellent setup!

Thanks for Sharing Raivo!

Best Wishes,

   Chris

raivope posted this 04 October 2021

Hi,

Quick comment about the latest picture.

You may lose dramatically the signal integrity if done as on that picture unless using RF resistors and shielding. And having custom wiring or resistors will lose the consistent 50ohm transmission-channel impedance and may distort a wave.

Do not use a normal resistor - this adds inductance - probe has itself inside the resistor wire (distributed resistance) for that RC filter purpose.

Try first the direct adaptor version and keep distances as short as possible.

Raivo

Chris posted this 04 October 2021

Hey Raivo,

Yes true! Good points My Friend!

Best Wishes,

   Chris

Jagau posted this 04 October 2021

Hi Chris

Your last image is a great representation of how to have a high frequency probe with very low inductance. This is the main problem when working at high frequency. The careful work as in the image is an excellent demonstration and in addition the ground probe is extremely short.

You just have to know that the length of the ground probe is the big problem when we are in the presence of very high frequency, the very careful work of the author is excellent in order to avoid this.

If you want to see the importance of the length of the ground probe, watch this video.

Thank you for sharing.

Jagau

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Chris posted this 04 October 2021

My Friends,

@Raivo and @Jagau are correct!

If one is using High Frequency, most of us do not, but if you use High Frequency, all leads, Earth, DUT Leads, all leads / wires in general, should always be as short as one possible. This is Important and is outlined in many places here on this forum, one being Here.

By minimising all the stray Inductance and stray Capacitances, one can get a much more accurate reading on the Oscilloscope!

In my opinion, even at lower Frequencies, this should be done, minimising Wire Lengths in all areas! It makes for neater Experiments and better Switching Circuits. Making all Signals very much easier to observe and measure.

Short Wires make the Circuits much easier for others to follow also.

Best Wishes,

   Chris

thaelin posted this 05 October 2021

Hi and welcome back Chris!

   I have two of the originals and have been using them a lot. I have found no fault in them and the measurements have come out to be near exact to using other means too. 

thay

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Chris posted this 06 October 2021

Hi Thay,

Thank You and Welcome back also!

The Measurement Block is! It is very accurate and very reliable if one stays within the physical parameters.

I said, at the start, use Low Input Voltage, thus a the Low Wattage Resistor, and as replicators increase their knowledge, we are increasing the Current Sensing Resistor Wattage as we measure more and more Output Power,

This very simple PCB is of emmense benifit! It is very odd other PCB's like this do not exist! I found none at all when I started this! So I made my own!

 

And, now, of course, we have our own Aboveubity Open Source Measurement Block in several different versions now.

Best Wishes,

   Chris

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thaelin posted this 20 October 2021

Hi all:

    Well guess I have to ask a really dumb question on the use. I have put together  the inductive experiment and had what I feel a great result finally. I still have not figured out how to read millivolts with a scope yet. Too much noise on the output. I used a standard meter and across the shunt read 13.8 millivolts. If I remember, chris said to  multiply by 10 for the "amps". God, if that is true, I have some massive circulating current in this. 

   Before I start a thread and post the setup, I want to verify this

 

thay

 

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Jagau posted this 20 October 2021

Hello Thaelin


A standard meter (DDM) cannot accurately read current through a non-inductive resistance. Their standard use does not go more than 0-500 hertz and a maximum of 1Khz with less precision especially if you use pulsed or PWM current.
In addition the cables are not shielded and full of interference is found in the cables and the impedence is poorly matched.
You must use an oscilloscope for this job and a measurement block.
With an oscilloscope and with the math probe at 1X you will read very weak signals without multiplication to do 1: 1
With 10X the scope drops the signal by 10 and you have to calibrate your scope well to do the same, the new scope all have this function. The signal should however be stronger at this position 10X and have a greater bandwidth than 1X.


jagau

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Chris posted this 20 October 2021

Hey Thay,

From the above post here:

 

It is very easy and very accurate! A small few have tried to fault this PCB, but failed miserably as usual!

13.8 millivolts

 

If you have this setup correctly, then 13.8 millivolts becomes 138 milliamps, so not a lot, I would recommend using Higher Voltages as there will be a lot of Noise at these low Power Levels! Low Power Levels are a problem for all Measurement equipment unless one can afford the very expensive equipment! 20 - 100K sort of stuff.

50 millivolts is the industry standard Nose Floor, so avoiding as far as possible the Noise Floor will be of benefit!

I would recommend:

  1. 250 millivolts or above, for accurate measurements.
  2. Check your environment for excessive Noise, its common to have noise enter from other sources!

 

Best Wishes,

   Chris

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Weeks High Earners:
The great Nikola Tesla:

Ere many generations pass, our machinery will be driven by a power obtainable at any point of the universe. This idea is not novel. Men have been led to it long ago go by instinct or reason. It has been expressed in many ways, and in many places, in the history of old and new. We find it in the delightful myth of Antheus, who drives power from the earth; we find it among the subtle speculations of one of your splendid mathematicians, and in many hints and statements of thinkers of the present time. Throughout space there is energy. Is this energy static or kinetic? If static, our hopes are in vain; if kinetic - and this we know it is for certain - then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature.

Experiments With Alternate Currents Of High Potential And High Frequency (February 1892).

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