Is this Incremental encoder working?

[camerart]

Hi,
Just received this encoder: https://www.ebay.co.uk/itm/Light-We...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

I connected Black to 0V Red to 5V An oscilloscope between 0V and Green and between 0V and White.

I got nothing! Is it working, or is there more to it?
Camerart.

 

[MaxHeadRoom78]

It states open collector, in this case you have to provide a (1k) pull-up in order to see a signal.
Max.

 

[camerart]

It states open collector, in this case you have to provide a (1k) pull-up in order to see a signal.
Max.

Hi M,
Like this:

C.
P.S. Have you changed your Avatar?

 

[dknguyen]

Hi M,
Like this:

C.
P.S. Have you changed your Avatar?

yes. anything from 1K to 10K should probably work

 

[MaxHeadRoom78]

Hi M,
Like this:

Yes that 1k will work, if you need RS485/Dual (A & A\) and (B & B\) there are a few IC's out there that will do it..

C.
P.S. Have you changed your Avatar?
Not on this site!
Max.

 

[camerart]

Hi,
I tried a test, wiring as #3 with 5K resistors instead of 1k, but still no signal.
Any other ideas?
C.

 

[dknguyen]

What Pommie said below.

 

[Pommie]

Your diagram appears to show both outputs connected to ground.

Mike.

 

[camerart]

Your diagram appears to show both outputs connected to ground.

Mike.

Hi M,

The leads coming from the oscilloscope on my (poor) drawing represent the external screen of the coax going to earth and each centre going to a phase of the encoder.

https://www.ebay.co.uk/itm/Light-We...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

C

 

[MaxHeadRoom78]

You should also be able to see a distinction by using a meter from the 0v to either output, turning the shaft as Slowly as possible should show the signal varying.
M.

 

[camerart]

You should also be able to see a distinction by using a meter from the 0v to either output, turning the shaft as Slowly as possible should show the signal varying.
M.

Hi M,
I agree, so it looks as if it's faulty.
C

 

[dknguyen]

Is it drawing any supply current? And does it always read high or low?

 

[camerart]

Is it drawing any supply current? And does it always read high or low?

Hi D,
yes, 5V 2.4mA.
C.

 

[MaxHeadRoom78]

Remove the resistors and see if there is any change in current for any position..
Max.

 

[dknguyen]

Hi D,
yes, 5V 2.4mA.
C.

What logic state are the outputs locked in with resistors in place? HI or LO?

Try measuring reistance between each output and ground with no power or resistors. If they measure low resistance then someone blew the output transistors by connecting directly to Vcc.

 

[camerart]

Remove the resistors and see if there is any change in current for any position..
Max.

Hi M,
2.4mA while rotating.
C

 

[camerart]

What logic state are the outputs locked in with resistors in place? HI or LO?

Try measuring reistance between each output and ground with no power or resistors. If they measure low resistance then someone blew the output transistors by connecting directly to Vcc.

Hi D,

Meter Black, to 0V, RED to output OPEN CIRCUIT
--------Black to +V, RED to output OPEN CIRCUIT
--------Red to 0V, BLACK to output 1.8M
--------Red to +V BLACK to output 26M

C.

 

[dknguyen]

Weird.

 

[camerart]

Weird.

Hi D,
Weird!

My test or the result
C.

 

[dknguyen]

Hi D,
Weird!

My test or the result
C.

The result is as it should be. That encoder is supposed to be able to take 5-24V, right? Maybe try a higher voltage? Though that shouldn't be required.