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linear incremental scale

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raman00084

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I have connected a incremental linear scale in QEI module 1 of DSPIC33EP512MU810 controller. if i move the scale i am getting pulses in increment of 1 but my qei module is 4x.

also the Repeat-ability of the pulses for a fixed linear distance is not same it fluctuates by 4 to 7 counts.

if i connect the same scale to DRO of the scale manufacturer i am getting exact pulses of for the fixed linear distance.

i have attached the wave form of the linear scale.

IMG_1.jpg
setup_qei(1,QEI_MODE_X4,QEI_FILTER_DIV_16,QEI_MODE_TIMER_INTERNAL,QEI_POS_LE_INT,QEI_POS_GE_INT);

COPMLIER USED IS PIC CCS
 

There's something wrong with the waveform, it's not the expected digital quadrature signal (50 % duty cycle, 90° degree phase shift). Scale wrongly connected?
 
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