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W126Club.nl • How to: Teller kalibratie : How-to
Pagina 1 van 1

How to: Teller kalibratie

BerichtGeplaatst: 20 jun 2010, 20:19
door Wasibi
How To: Snelheidsmeter

Heb ergens geschreven dat het ding te calibreren is
Een defecte meter eens opengeschroefd en het ding zit best wel simpel inelkaar.

De meter maakt gebruik van de UAF 2115 IC http://www.datasheetarchive.com/UAF2115-datasheet.html

De VR sensor achter op de bak geeft een wisselspanning welke in de tellerunit wordt omgezet in een blokspanning d.m.v. een transistor (aan-uit).
Frequentie varieerd met de snelheid / toerental cardan as.
Die frequentie wordt in het IC omgezet in stroom door de snelheidsaanwijzer. Feitelijk een Ampere meter. Natuurlijk als de frequentie (snelheid) toe neemt dan neemt de stoom ook toe en gaat de wijzer meer aangeven.

De snelheidsmeter is te calibreren met het varieeren van de weerstand aan pin 4.

het telwerk wordt met een stappenmotor verzet, de driver van de stappenmotor zit in het IC
Het kilometer telwerk kan ook gekalibreerd worden, dit is niet traploos te doen. Er zijn hier 3 keuzes die geselecteerd kunnen worden door pin 11 aan de (-) te leggen, Pin 11 los te laten en pin 11 aan pin 10 te verbinden. Zie de datasheet.

Ik heb ff een schema getekend hoe de VR sensor zit aangesloten.

De weerstand zit onder het tellerblok, je kan het pootje lossolderen en door de print losdrukken en een nieuwe weerstand of potmeter aan de printspoorkant solderen.
De weerstand is hier 75Ohm


Have fun!

Re: How to: Teller kalibratie

BerichtGeplaatst: 20 jun 2010, 23:26
door Wasibi
Had nog een picje van de bewuste weerstand, kreeg hem niet in het org. bericht.
Yep Rene, is een synchroon motortje maar kijk eens op het schema en op de foto, zitten 2 spoeltjes op en het anker is een magneet. een ac motortje zou 1 spoel met kortsluitanker hebben. Niet nauwkeurig genoeg voor de toepassing ;)

20062010330.jpg

Was het tegenwoordig nog allemaal maar zo eenvoudig :roll: