Hi guys

What is the best way to test a magnetic pickup sensor ?.

 

Guitar string?

 

I am talking about the types used on flywheels and teeth gears to measure rotation speed.

 

Hi guys
What is the best way to test a magnetic pickup sensor ?.

Monitor the output while playing a strong magnet across the sensor (observing correct magnetic polarity, of course)...

Best regards
HP

PS more detail will require more details

 

The sensor is used to measure a shaft rotation speed. The MPU is installed on a bracket and takes the readings from the gear teath on the shaft.

I am able to take the MPU apart from the bracket to test it but the question is how do i test it ?.

 

Turn it on and see if it works?

I'm not trying to give flip answers, but there's no way to give a detailed answer without more details of the situation. Power source? Model number? Sensor details? Photo?

 

Turn it on and see if it works?

I'm not trying to give flip answers, but there's no way to give a detailed answer without more details of the situation. Power source? Model number? Sensor details? Photo?

The MPU model number is (3034572). It is directly connected to an input/output card on a micro controller board that works as a PI controller. I am able to replace the sensor and go ahead but what i want to know is a way to test these MPU's ?

 

The sensor is used to measure a shaft rotation speed. The MPU is installed on a bracket and takes the readings from the gear teath on the shaft.

I am able to take the MPU apart from the bracket to test it but the question is how do i test it ?.

If this is the type similar to used in automotive timing that measure flywheel crank teeth, then they are usually NPN open collector output, if so you need to place a 1k resistor from output to +vdc.
Then use a piece of ferrous metal to pass in front and measure the volt drop across the resistor.
The threaded barrel type also work this way.
Honeywell make one 1GT101DC
Max.

 

If this is the type similar to used in automotive timing that measure flywheel crank teeth, then they are usually NPN open collector output, if so you need to place a 1k resistor from output to +vdc.
Then use a piece of ferrous metal to pass in front and measure the volt drop across the resistor.
The threaded barrel type also work this way.
Honeywell make one 1GT101DC
Max.

Thanks for the replay Max.

If i am right a magnetic pickup is just a coil coiled around a small magnet ?

 

Often a little more to, it usually consists of a hall sensing circuit with transistor output, so usually some on board electronics.
There is also non-ferrous detector types.
Max.