Is this Incremental encoder working?

camerart · Jan 24, 2019

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 · Jan 24, 2019

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

camerart · Jan 24, 2019

MaxHeadRoom78 said:
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 · Jan 24, 2019

camerart said:
Hi M,
Like this:

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

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

MaxHeadRoom78 · Jan 24, 2019

camerart said:
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 · Jan 27, 2019

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

dknguyen · Jan 27, 2019

What Pommie said below.

Pommie · Jan 27, 2019

Your diagram appears to show both outputs connected to ground.

Mike.

camerart · Jan 27, 2019

Pommie said:
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 · Jan 27, 2019

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 · Jan 28, 2019

MaxHeadRoom78 said:
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 · Jan 28, 2019

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

camerart · Jan 28, 2019

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

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

MaxHeadRoom78 · Jan 28, 2019

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

dknguyen · Jan 28, 2019

camerart said:
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 · Jan 28, 2019

MaxHeadRoom78 said:
Remove the resistors and see if there is any change in current for any position..
Max.

Hi M,
2.4mA while rotating.
C

camerart · Jan 28, 2019

dknguyen said:
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 · Jan 28, 2019

Weird.

camerart · Jan 28, 2019

dknguyen said:
Weird.

Hi D,
Weird!

My test or the result
C.

dknguyen · Jan 28, 2019

camerart said:
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.

Is this Incremental encoder working?

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