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Subject: Help me build an cartridge tester

Date: 03/23/00 at 5:35 AM
Posted by: Peter Lingman
E-mail: sdtp@telia.com
Message Posted:

Can anyone supply me with some hints about the project i'm working on.
> The project is an cartridgetester for private use.
> Here comes the problem.
> I have an cartridge that has 14 contactpoints and the reference point
> is nr 1. If i measure between point 1 and 2 or 1 and 3 and so on i get
> 0,35 Ohm between the points. That shows that the cartridge is ok. But
> if i get 0,65 ohm it is damaged, If the cartrigde is ok i want an green
> led to light up( one LED for all points) it should not light up when
> the cartridge is faulty. Here comes another explaination. if i put +1V
> on pin 1 and i reed 0,8V at the other pins the led will light up. But
> when the voltage is higher than 0,8V the led will not light up, bacause
> the cartridge is faulty.
> If anyone can help me with this you gonna have your name on the label
> who have helped me do develope this product.
> If you have any question feel free to mail me at: sdtp@telia.com
> or by phone +46 54 876887 Sun-Thur 11-11 GMT

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