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Thank you Bil and Jennifer

Iron

Thanks Bill

Good Lecture 

No Nonsense

the power used to determine run time

Im more interested in dc power

Thank you, very good information

shunt resistors, inductors, no transformers

using electronic and passive loads

Working on low voltage power supply optimiztaion

used series resistor and special sensing ICs

Iron

measure the power on the load side

Iron

measure dc power

 

Iron

@Jen - power being used

Iron

@Jen - line powered AC

Iron

Great to have access to the recorded sessions!

Iron

Missed the live lecture again...

Iron

most applications are low power, under 10W per device.

Iron

Thanks Bill and Jennifer.

Iron

concerned with battery power supply and measuring power cionsumed by the device.

Iron

Thanks Bill. Excellent presentation.

Iron

great presentation Bill, how would you rate the 4 transducer types in terms of cost and reliability?

Iron

thank you good info

Iron

@davet22: Thanks for the part number. I've got the data sheet on it now.

Iron

I'll get tomorrows class as an archive. I'll be back on Thursday.  Rick

Iron

According to my NIST clock, we just passed the start of the hour. So it is goodbye until tomorrow--hopefully we will "see" you again then.

 

Blogger

Ah, understood. Live chat has its limits, I see...

Blogger

Bill, I haven't used a Hall device is series for measureing current. I asked the question about series resistance because that application was mentioned during the slides on using Hall devices with a fixed magnetic field present.

Iron

Counting down, will be here about 5 more minutes. And Dave, thanks for your answer to RSwanson, I may be misinterpreting his question.

Blogger

rswanson: I have used Allegro ACS713 series devices that include the current conduction (metal bar) path internally in the IC for super ease of use and I believe much more accuracy. It's series resistance spec is about 1.2mOHM

Iron

rswanson--why are you using a Hall device in series? The Halld device is "freestanding" with respect to the wire/line of interest?

Blogger

Hydrogent--the answer is the usual: it depends. It depends on the distance, oritentation, etc. But remember--a toroidal coil is (in theory) ontl affected by the field within, not outside of the toroid.

Blogger

 Hi Bill, just restateing a question I had earlier.  In using Hall sensors for series current measurement, what is a typical series resistance of the Hall device?

Iron

Bill, Does this mean that mag field from phase 1 won't affect Ro coil on phase 2?

Iron

See you tomorrow everyone!

Iron

Suzie--I will look for sources on higher current--but usually the transducer vendors have very good app notes. And there are also regualtory standards which you don;t have to follow, but may be worth a look at.

Blogger

thanks , hear you tomorrow again.

 

Iron

Suzie, I suggest to talk to the shunt makers about drift at various current levels - they should be able to tell you precisely what happens.

Iron

Sorry, I was looking at the wrong chat screen--we're here now.

Blogger

Got your response Bill...Thanks!

Iron

Hydrogent: Three coils--shouldn't have any interaction--especially as they are toroids.

Blogger

I really enjoyed the presentation, though.

Iron

@hydrogent. what are you reading the coils with.

Iron

Suzie--use the vendor numbers, don;t try to re-evaluete them

 

Blogger

Great Continuing Education.

Iron

I wondered what was going on. We can't see the responses from Bill???

 

Iron

Thanks Bill. I guess you are not on-line

Iron

More  Analog Functions.

Iron

Using 3 Rogowski coils on 3 phase & concerned about interaction inside panel box. Anybody have experience with this?

Iron

It appears that the answers go only back to the ouestion submitter.  That is a disappointment as it would be possible to learn if we all could see the responses.  This feature and yeaterday's troubles make this course of much less value than it could have been.

Silver

One question that I have concerning shunts. We have various values of bar shunts here at our lab that we use for measuring current levels from 10a to 5000a. Is it necessary to actually prove the resistive value at various temperature due to self-heating, or is it acceptable to use thermal coefficients from the manufacturer? Also, in dealing with the high current, it is also important on the physical connections and orientation of the connections. Do you have any good sources of information on this topic?

Iron

Bill, are you here with us on the chat line?

Iron

have used all four transducer types in low and high power applications.

place a fixed cal current line to set your circuit base line.

 

Iron

One thing I've encounter quite often with Hall Effect sensors used in the AC/DC type current probes you mentioned is the DC zero value is often drifting/shifting. You must have a means of nulling the "zero" point.

Iron

In using Hall devices for series current measurement, what is the series resistance typically seen in the Hall device?

Iron

Both! We deal with low and high power apps!

Iron

> 100 watts for my current application (AC)

Interested in lower power DC as well.

 

Iron

low (mW) and high (<1KW)

 

Iron

Both over and under 100 W.

Iron

Thanks -- very clear

Iron

 Both fractional microwatts to thousand of watts applications.

Iron

Bill, Great intro & refresher!

Iron

Designing 12.5KVA driver

Iron

lower power regiment

Jarnail

Iron

I had to re-start the webinar in order to get an audio ikon

 

Iron

@Jennifer- Lower Power

Iron

thanks so much, Bill!

Very easy and clear speech flow

Iron

Does Hall sensors work for measuring high voltage pulses like 10kv eg solar fense parameter  monitoring

Iron

@Bill  Thanks for today's the session.

Iron

what about safety issues w/CTs? 5A CTs can develop hazardous voltages. 1V & 0.33V CTs are much safer.

Iron

Bill, will you touch on power factor?

Iron

Bill, your intimate knowledge of the subject makes it easy and interesting.  Thanks.

Jarnail

Iron

I have touched the speaker / mute icon before and the audio started

Try refresh.

Iron

Blairk - In a series circuit current is same everywhere, so shunt can be anywhere

Iron

my audio just went intermittent again!

Iron

You have to hit the triangle play button to hear the audio

Iron

Is it better to place a shunt resistor before or after the load?

Iron

If there is a player on this screen, my company has blocked it. :(

 

Iron

You have to download the slide from "Today's Slide Deck" above!

Iron

@lbeaty: You can download the powerpoint by clicking the Today's Slide Deck link just above the chat window.

Iron

@lbeaty-  Would be a great trick if you do get video.  There is none.

Iron

You mean i am not stupid?  no, you didn't say that.

Iron

@lbeaty: Download the powerpoint by clicking the "Today's Slide Deck" link just above the live chat.

Iron

@lbeaty, there is only audio

Iron

@lbeaty: No video. Audio with powerpoint and live chat.

Iron

I must be stupid.  I can't get any video.  Frustrating.

 

Iron

dburris - all the variations of Ohms law are equally valid - it is a convenience to work with the info you have.

Iron

Now shouldnt you use the formula I squared x R  for DC measurement for a more accurate measurement?

Iron

I would have to constantly press play in the latest IE switched to chrome and it works fine.

Iron

battery and power being used

 

Iron

Also DC power in motor drying applications

Iron

Line power both in and out of our products

 

Iron

Does the sound keep stopping for anyone else?

Iron

AC power and power used by units under test (Medium voltage down hole induction motors).   Looking at PMM motor testing in the near future.

Iron

More oftern than not I am measuring DC - Batteries and measuring current flow through a portion of the circuit, as well as the overall usage from teh battereis.

 

Iron

1. AC power for circuits in a home.

2. Power being used.

Iron

line power and DC switching supplies

 

Iron

battery power

power being used

 

Iron

power being delivered and being consumed be the circuits

Iron

We are measuring DC power most of the time.


We are measuring the efficiency so both.

Both AC & DC (inverter/charger). Consumption & dissipation. High power

Iron

Mostly Dc but also AC from time to time

Both input and output power

Iron

Measuring DC power, and measuring power being used

 

Iron

Battery DC; Used Power

Iron

both dc and ac most intrested in power used

Iron

Line Power AC (Building lines)

Power being used

Iron

AC Power being used.

Iron

AC and measuring power used.

Iron

I measure both input, output, DC and AC power.

Iron

measure DC power most time

Iron

DC battery power, rate of usage (charge & discharge).  

Iron

i am hearing yeterdays lecture

Iron

line power - AC line

Power being used

Iron

1. battery power typically.

2. power being used.

Intermittent audio also.

Iron

I am hearing yesterday's lecture.

Iron

Sound is A-OK today and I like what I hear from John Farrell as well! 

Iron

Works good on Chrome

Iron

Sound is on for a couple of seconds then it is gone.

Iron

Ola from Midland.  Have audio... sometimes

Iron

Refresh, F5, worked for me.

Iron

Audio play button and audio do not work in FireFox.  Need to use IE.

Iron

Sound is great in Southwest Missouri!   :)

sound is intermittence!

 

Iron

hit play, refreshed, etc... no sound here either.

Iron

Push the Play button on the audio bar

 

Iron

try to refreh, and hit play couple times

Iron

yeah, got sound today

Iron

Greetings from NorCal!

 

 

Iron

Our firewalls are likely blocking the sound.  Is there a phone number to call and listen?

Iron

No sound or action yet!

Iron

Does anyone have sound yet?

 

Iron

good afternoon to all signed in

Iron

Yes, the audio issue has been resolved.  You may just need to  hit the play button to get started at 2pm, once the player apears

Iron

I watched and heard yesterdays archive. Looks like they got it fixed to me.

Iron

Is there a call in phone number is sound is not working?

 

Iron

Hi everybody , Hope the yesterday problem fixed

Howdy from Birmingham, AL.

Hoping for audio today.......

Iron

Have you fixed the sound problem?

Iron

Hello from Melbourne Beach Florida

Iron

Hope the sound is working today

 

Iron

I'm here!  Let's see if it works today!

Iron

For those with audio problems...

Adobe Flash 11.3.300.270 works for me.

Iron

Here from Arizona.  Hoping for audio today.

Silver

Hello from Sunny SE Lake Simcoe Area, Ontario Canada

Iron

Good morning from San Diego area CA

Iron

good afternoon,everyone

Iron

I was thinking, some background music now

would help me confirm audio.

Iron

Hello from snow-laden landscape in Calgary Alberta Canada

Jarnail Clair

Iron

Hello from sunny and mild Huntsville, Al.

Iron

If you listen to it now, you can test your media system.  :)

Great, thanks. I will have to view it when I get a chance.

Iron

@Suzie  Yesterday's "replay" version is working fine.

Did they ever get the technical difficulties resolved with yesterday's training? I had to log off after waiting 15 min. Hope it works today.

Iron

should be interesting

Iron

National League Champion SF GIANTS!! 

Now for the World Series - GO GIANTS!!!

It's 49°F now and High of 58°F. 40% Chance of Rain.

Iron

Howdy folks!!  STL Cardinals is my first choice, then the Central Division, finally National League. GO GIANTS!!! :)

DannyN from San Jose, CA

Iron
Hello from Mesquite, NV.
Iron

Hi, has the lecture started?



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