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What digital multimeter scale should be used when testing the signal from a Hall-effect switch?
Wiki User
∙ 15y ago
You should use the scale that shows correctly your supply voltage.
Most Hall-effect switches provide either a logical output or an open-collector output.
If the output is logical, you can expect the value to be between 0 and your supply voltage.
If the output is open-collector, you must bias the output to your supply voltage with a resistor; otherwise you will always read "0". If biased, the output will be between 0 and the voltage bias.
If you are not certain of which type you have, try finding the datasheet on the internet; otherwise, you can always bias the output to your supply voltage; if you properly choose the resistor, it should not adversely affect the behaviour of the logical-level output.
I would suggest trying 1 kOhm with a 5 V supply; this gives a bias current of 5 mA, which most Hall-effect sensors should be able to cope with.
There are other Hall-effect sensors that provide linear output, but this answer is about a Hall-effect switch.
Wiki User
∙ 15y ago
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