New Youtube video tutorial: measuring a 0.001 Ohm shunt

[juliorz]

Dear All:

Recently I created a channel on You tube, and I have began to produce

technical videos.


On the video below, I use an HP 3457A to measure a 0.001 Ohm current shunt,

Not exactly what the instrument was design for, but it did a fairly decent

job.

HP 3457A Measuring a 0 001 Ohm Shunt Part 1 - YouTube


Sincerely,

Juliorz

 

[Ron E]

Interesting experiment. If the uncertainty of your bias is greater than the bias itself, how do you justify subtracting only the bias from the result, when really a 6 sigma on that measurement would be +/- 0.2 mOhm - and then why so many significant figures? It would be interesting to see a histogram of your shunt test to see if it is a truly normal distribution, etc.

 

[juliorz]

Dear Sir:

First, I want to thank you for taking the time to watch my video, and I
also appreciate your feedback.

You are correct, I put this experiment together in a hurry just to show

that an old HP/Agilent 3457A could get the job done. (But NOT in a

production environment, it's probably TOO time consuming for that, although

with the HPIB/GPIB interface, we can speed up the process considerably)

I used a 2.25mm cooper plate to produce the closed thing to a real short

that I have ever been able to produce.


Yes, I was using significant figures that could not be justified.

And yes, it would be interesting so see if the data points fall in perfect

"bell type" distribution. Unfortunately, I don't have access to the raw data

from the experiment (the 200 samples used to compute the mean and

standard deviation) This was a "stand alone" experiment, no external

computer used to log the data. If more people request that I perform the

experiment again to dump the raw data to an external computer (maybe

generate an Excel spreadsheet) and get the actual distribution, I will consider

it.

In the mean time, stay tune for the release of part 2 in which I repeat the

experiment but in a completely different way (I don't want to give away the

ending)

 

[juliorz]

Dear Sir:

First, thanks for watching my video and providing feedback.

You are correct, I put this experiment in a hurry just to show that an old HP/Agilent 3457A could get the job done.

Yes, the number of significant figures shown, is not appropriate I will take that into

consideration. Regarding the distribution of the data, this was a "stand alone" experiment

with no external computer to collect the raw data.

If more users requested, I will repeat the experiment but this time I will dump all the

raw to an external file which can be used to create an Excel spreadsheet.


In the mean time please stay tuned for part 2 in which I will repeat the experiment but

using a completely different procedure(I don't want to give the ending away)

Again thank you,

Juliorz