Analogic comparator

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TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Analogic comparator

Beitrag von TOURNEUR » Sonntag 23. Mai 2010, 00:05

Hello ,everybody

On a project ,I used an analogical comparator ,with two analogic data .

When one A>B or A<B ,it working good

But my problem take place when A=B ,there no signal on the outpin A=B when the two input analogic signal are equal .

Why or where is my problem ?

TSD
Beiträge: 95
Registriert: Sonntag 28. Dezember 2008, 18:58

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TSD » Sonntag 23. Mai 2010, 07:14

Hello,

you should attach an example to the thread for comprehension what happened.


Many greetings,

tsd

TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TOURNEUR » Sonntag 23. Mai 2010, 09:18

Thanks for your reponse ,

I give you a picture part with 2v on A consign ,and you can see on the numeric meter ,2.0V ,and A=B don't appear.
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comparateur analogique.JPG
comparateur analogique.JPG (71.27 KiB) 9590 mal betrachtet

TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TOURNEUR » Sonntag 23. Mai 2010, 09:20

Thanks much for who can help me for this problem

TSD
Beiträge: 95
Registriert: Sonntag 28. Dezember 2008, 18:58

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TSD » Sonntag 23. Mai 2010, 10:25

Hi Tourneur,

try to offset the output A1 to zero. The variable resistor from the K8055 should be turned to a zero value.

Many greetings,

tsd

TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TOURNEUR » Sonntag 23. Mai 2010, 10:47

It's working good !

I turn my Analog input from K8055 to a 0v value ,and enter in the analog comparator a 0 value .

But how to work with another equal value ,if i desire enter a consign more high as 0 , like 1 , 2 or more ?
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comparateur analogique 2.JPG
comparateur analogique 2.JPG (52.01 KiB) 9543 mal betrachtet

TSD
Beiträge: 95
Registriert: Sonntag 28. Dezember 2008, 18:58

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TSD » Sonntag 23. Mai 2010, 11:21

Hi Tourneur,

you should clean (delete) the crosspoint between input A and B of the comparator.

The output fom your K8055 will be added to both inputs (A and B) - so, never you will get an equal.


Greetings from

TSD

TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von TOURNEUR » Sonntag 23. Mai 2010, 14:03

I do it ,

So it's work ,but for pair consign number only ,like : 2 , 4 , 6, and 8 .
And not for the impair number like 1 , 3, 5, 7, and 9.

And it's the same thing for their multiple : ok for 20, 40, 60 and 80 no for 10, 30, 50 , 70, 90, and it's not working too for the no-decimal number ,like : 2.1 or 21 , 22 ,43 ,etc ...
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comparateur analogique 3.JPG
comparateur analogique 3.JPG (71.14 KiB) 9478 mal betrachtet

funkybaer
Beiträge: 440
Registriert: Mittwoch 22. Oktober 2008, 08:51
Wohnort: Kitzingen

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von funkybaer » Montag 24. Mai 2010, 15:34

Hello TOURNEUR

Your k8055 has a 8 Bit input with 5 Volt , there are ~ 0,019 Volt per Bit

Yuor Display has 0,1 Volt - so you can not see the right Display - and the compare doesn`t .

make your Display with 4 Digits right the decimal Point and you see the result.

Gerhard

funkybaer
Beiträge: 440
Registriert: Mittwoch 22. Oktober 2008, 08:51
Wohnort: Kitzingen

Re: Analogic comparator , A=B don't work when E1 and E2 equal !

Beitrag von funkybaer » Mittwoch 26. Mai 2010, 13:30

Hello TOURNEUR

Here a little sample for the compare of 1 Digit right - that means compare
with 25.1 fixt between a input Display.


gerhard
Dateianhänge
VGL.prj
(1.26 KiB) 316-mal heruntergeladen

TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Re: Analogic comparator

Beitrag von TOURNEUR » Donnerstag 27. Mai 2010, 22:38

Hi evrybody !

Thanks a lot ,for you interest ,so I had test a new shematic ,

It 's include an electronical selector ,betwen my K8055 interface witch giving me 26.31 analogue value

With your help request ,now I use a 5 digit display ,and to compare ,if it can be an error ,of my wiring ,I use a fixed value of 26.31.

I,the last to command the selector a simple switch select the fixed value ,or my k8055 value .

So the result the same : there no fonctionality with my external interface .
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with k8055.JPG
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without k8055.JPG
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Zuletzt geändert von TOURNEUR am Donnerstag 27. Mai 2010, 22:51, insgesamt 1-mal geändert.

TOURNEUR
Beiträge: 35
Registriert: Samstag 22. Mai 2010, 23:56

Re: Analogic comparator

Beitrag von TOURNEUR » Donnerstag 27. Mai 2010, 22:47

So now ,I see problem witch is in my configuration interface, or I don't know where .

But You can see my K8055 ,first analogue input configuration "AI1"

You can see ,I had get two min / max value ,with 3 unity after 0 to can get a best accurancy (in thinking ,my problem ,can be here )
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K8055 configuration.JPG
K8055 configuration.JPG (60.89 KiB) 8803 mal betrachtet

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