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once again, great job sir randy...well informative, excellent presentation...

now. i have to have a break first in attending the class, i will resume after 2-hours break to continue the lesson for day 2 class lecture...

thanks once again to the digikey & design news, great!

GREAT sir randy, much appreciated!

i am now on slide 17 of the presentation...

i am now on slide 10 of the presentation...

just downloaded the slides of the presentation and now begin with slide 2...

good afternoon sir randy, i am now for your lecture...

Very informative lecture

Iron

Great to have access to the recorded sessions!

Iron

Missed the live lecture

Iron

Taking the class offline

Iron

Randy Thank you. I look forwrd to the rest of the sessions

Iron

Good overview and references.

 

I once had an application for a mil temp range air-flow sensor - part selection (availability) was the biggest issue there.

 

Would like to see more on Board Layout, Connection concerns etc.  I  may need to review your first class on this to see that.

Thanks Randy for a great lecture I look forward to 

tomarrows

I require around a 2% acuracy

I am mainly interested in room tempuratures for normal operation

I am mainly interested in infrared distance sensing 

Hi looking forward to this week of training

Sorry 0.5% OR not 0.05%

Iron

What no frequency domain

Iron

capacitive, resistive,..... etc

Iron

Sorry I missed this one live was traveling.

Iron

Good Morning from San Jose, CA.

Iron

I use 0 to 50 degs C

 

Iron

I am also interested in piezo- type sensors.

 

Iron

Thank you Randy, very good lecture

Iron

Thank Randy for informative lecture.

That's going to do it for today. I hope to see you back tomorrow.

Blogger

why range is so tight? 0-70C, only.

As noted, the operating temperature range may be quite different that the temperature range used for specifying the performance capabilities of the sensor.

Blogger

Hello, I was following the lecture on the piezoresistive sensors compensation. Can you please tell me if there are designs matching a use in the high frequency range. I am looking for a solution for a piezoresistive sensor working in the frequency range up to 1MHz. Thank you in advance for any advice. Best regards, Libor

This goes well beyond the frequency range that I have been involved with. One of the problems with piezoresistive MEMS sensors is that a gel is used to protect the diaphragm and resistive elements. This can cause considerably damping at high frequencies.

Blogger

Thank you, very informative part 1 of the series.

Iron

Chuck: is it possible to download th audio for these sessions?

Do you have some reference website can provide to us? Thanks a lot.

 

The notes section of the PPT slides has links on almost every page.

 

Blogger

thank you, but I was unable to listen to the lecture. It seems that IT may have blocked the site. I can't listen to the archives either. I'll try tonigth at home

Iron

Hello, I was following the lecture on the piezoresistive sensors compensation. Can you please tell me if there are designs matching a use in the high frequency range. I am looking for a solution for a piezoresistive sensor working in the frequency range up to 1MHz. Thank you in advance for any advice. Best regards, Libor

Iron

Slide 9 seems to be shorting signal output.

Also - the "zero trim" resistors are in a position I normally expect to be for gain trims. For zero trim I would expect the resistors to be connected to the signal leads.

I hoped I addressed this in the tuorial since it was posted beforehand.

 

Blogger

Very interesting talk

Iron

Do you get into humidity sensors in your classes?

Iron

Thanks Randy and Chuck

Iron

Very informative.  Thanks

Iron

Randy, Thanks for a great lecture.

Iron

Thank you, very interesting!!

 

Iron

Do you have some reference website can provide to us? Thanks a lot.

Iron

dgillyard - yes interested in humidity sensors.

Iron

Thank you Chuck and Randy

Iron

Great start. Thanks!

Iron

Humidity sensors , is there interest here?

 

Iron

very good lecture, thx alot Randy

Iron

1% resistors have 3% at end of life, 2% at start

Iron

Needed accuracy varies by project, typically ~2%. 

Iron

for temperature 0.2C across measurement range of 0-40C

Iron

we spec our accuracy at 1% but inclusive of all errors (temp, drift etc)

Iron

Accuracy depends on project but better than 2% is "typical".

Iron

Accuracy is less important than correlating relative measurements - as long as they output is repeatable.

Iron

Industrial (-40C to 85C) temperature range is typically more than enough for most projects.

Iron

Room temperature, +10C to 55C 

-40 to 125 typicallly

 

Iron

only by this? this explains

Iron

-65C to + 45 c would work for Canadian outdoors  -- here we have a worst case -45 45C range

Iron

consumer electronics range

Iron

We operate in the industrila range: -40C to +85C

Iron

@mcferrinsteve-An archive will be available after the conclusion of today's live session, you may have better luck with the archived

 

Iron

RTD, PH and optical sensor now.

 

Iron

Commercial & Industrial

Iron

why range is so tight? 0-70C, only.

Iron

thermal, optical sensors

Iron

Is your lecture transcribed. I can't hear it.

 

I am just doing a sensor project. your lecture is very good.

 

Iron

wireless sensors, MEMS

Iron

I'm interested in all kinds of sensors

Iron

Infrared and thermopile

Iron

Bio electro/mechanical sensors

accelerometers, temperature, strain guage

Iron

Can't listen to lecture ever after reload

Iron

contact temperature sensors (that can sense temp. only by contact)

Iron

Wanting to find out what is available.

Iron

Accelerometers, gyros, temperature, pressure, float(switch), mag sensors... you name it... ;-)

Iron

electro-chemical and capacitive

Iron

Hi, its a pleasure to join

Iron

Here we go!  Audio is up!

 

Iron

Hello from Wichita, Kansas

Iron

Hello from Lima, Perú

Iron

Hello From Wichita, KS

Iron

That's 8 more degrees than we got...

 

Iron

Hello from Cedar Park TX

Iron

Hello from Warm Toronto

 

Iron

Hello from Chicago. it's 8 degrees here.

Blogger

Hello from frigid Milwaukee!

Iron

Hello from Zebra Technologies,

Iron

Hello Everyone,

We'll be starting soon.

Blogger

hello from michigan

 

Iron

hello from east bay. Happy MLK day and congratulations on the inauguration of the new U.S. administration

hello all from SLC 12F,

Iron

off-topic: anyone interested in a Starbucks gift card :)

Iron

Hello from University of Oviedo (Spain)

Iron

hello from Timisoara, Romania

Iron

Good day from Culiacan, Sinaloa, Mexico

It is common to add external zero trim adjustment on load cells. The span ajust is one or two resistors on the excitation. When two are used they are installed with one on the plus & minus excitation leads to keep the bridge symetrical and reduce cell interaction when used in multi-cell applications..

In reality there are two camps on bridge span trimming - they sceond school of thought is to put a variable resistor between signal leads and sprinkle isolation resistors around the bridge if used in multi-cell applications.

 

Good Morning from Lynn Haven, FL.

Iron

http://www.maximintegrated.com/app-notes/index.mvp/id/871 , it´s the same schematic, used to explain offset compensation

 
Iron

Good afternoon from Serbia

Iron

Hello from Huntsville, Al

Iron

@mark.brown - Perhaps Slide 9 needs a "band-gap device"  between the 2 arms.

Looks like some kind of wheatstone 4-arm device, in which case, you can't get at those internal resistances, so you are really only left with tweaking the ratio of the zero trim resistors for centering the (zero) offset between the 2 arms. I guess you also pad the internal resistances with external parallel resistances for the same effect, but I bet that won't do a lot for your linearity/range/ temp compensation.

Iron

Slide 9 seems to be shorting signal output.

Also - the "zero trim" resistors are in a position I normally expect to be for gain trims. For zero trim I would expect the resistors to be connected to the signal leads.

Hello from cloudy cold rotten SE Lake Simcoe in Ontario Canada. -12C 

Any openings in Florida or California -- maybe Artizona? Huh?  It's gotta be warmer there.

Iron

Last week's heat wave is over... -9 degF in Minneapolis today...

Iron

Good afternoon from Spain

Good Morning everybody

Iron

Good morning from Ciudad de buenos Aires, Argentina

Iron

Good morning from Scottsdale, AZ

Iron

Good morning from Chicago!

Iron

Good Morning from Mobile, AL



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