Hi amit1980,
Let me make sure I understand you correctly-
You have a machine that includes a conveyer. You have an incremental encoder and you would like to debug your system using a multimeter.
When you wrote "that conveyer not taking step" do you mean that it is a stepper motor that is not moving at all?
An incremental encoder generates pulses that overlap on the two lines. By counting the pulses and which order they occur on the two lines you can determine the distance, speed and direction travelled.
If the motor is not moving at all then the encoder will generate no pulses.
You can do a sanity check of your encoder with a multimeter. You can read the voltage of one of the tracks while you very slowly turn the shaft of the motor. Very very slowly. The rotor has to turn slowly enough that the multimeter will have time to detect the change in voltage. If you just spin the motor the pulses will happen too quickly for the multimeter to see them. This encoder has 2048 pulses per revolution. To be able to see one transition you would have to move the shaft 1/2048th of a turn.
If you just want to make sure that the encoder is producing any pulses at all then you can just set your multimeter to AC mode and spin the motor. A non zero voltage while spinning will mean that pulses are being generated.
If you need more information that this- such as the direction, whether the tracks are overlapping properly, or especially velocity- you will need to use a scope rather than a multimeter.
Since the encoder only produces pulses when it rotates, if your motor really isn't moving at all then the encoder is not likely to be the problem and you should investigate further up.
