K
We are facing a peculiar problem with optical encoders.
Application: Drive speed sensing of a material handling system (this speed signal is further processed along with instantaneous load cell value to arrive at feedrate.)
Sensor: BEI make dual channel incremental optical encoder. As per specification, two channels are expected to give identical pulse train but with a quadrature phase shift.
Problem: At any particular speed, when measured with a multimeter, the channel B frequency measures twice the value of channel A. However, if measured using an oscilloscope, the channels seem to have identical pulse train with quadrature phase shift (channel A freq=channel B freq).
Its perplexing why a multimeter & oscilloscope would read different frequency values at the same measurement point. Pl do help me out of this.
TIA
Karthikeyan
Application: Drive speed sensing of a material handling system (this speed signal is further processed along with instantaneous load cell value to arrive at feedrate.)
Sensor: BEI make dual channel incremental optical encoder. As per specification, two channels are expected to give identical pulse train but with a quadrature phase shift.
Problem: At any particular speed, when measured with a multimeter, the channel B frequency measures twice the value of channel A. However, if measured using an oscilloscope, the channels seem to have identical pulse train with quadrature phase shift (channel A freq=channel B freq).
Its perplexing why a multimeter & oscilloscope would read different frequency values at the same measurement point. Pl do help me out of this.
TIA
Karthikeyan