Respected Sir,
I'm using Ultrasonic Level Sensor with NI Crio Hardware. My sensor gives the PWM signal in the output and by measuring the ON time of this PWM signal i can get the distance. Now, the PWM signal which is at the o/p pin of sensor is typically havin upto 10 micro second ON time and 30 milli second OFF time. So, for the measurement of this signal which is having a very low duty cycle I have tried so many Programme based on pwm. But, I'm getting Mid refrence level errors in almost every programe and error no. is 20308, 20309. kindly give me the proper suggestion for this issue ..........
