I am using IC AD5933 to measure impedance. I communicate with the IC through Arduino Yun using I2C protocol. Using AD5933 I can measure impedances from frequency range 1 Hz to 100kHz. The system works fine for frequencies greater than 1 KHz using the internal clock and for frequencies lower than that, I have to provide an external clock. When I use an external crystal oscillator to provide an external clock of 1MHz, I get good results upto a frequency of 350Hz. Next, I wanted to provide a lower clock to measure frequencies lower than 300 Hz with good accuracy. I used 32.768 KHz external clock http://www.abracon.com/Oscillators/ASVK.pdf and tried to measure impedance at frequency of 100 Hz but then the IC does not produce any output signal for measuring the unknown impedance. Using an oscilloscope I found that AD5933 is not giving out a sine wave. I also tried providing an external clock using NE555P timer at clock frequency 58 kHz , 76kHz, but still no result. Using 1 MHz external clock, IC is able to generate a sine wave of 100 Hz but not when using the external clock at 32.768 KHz or 58 KHz.
Could anyone please guide me where could the problem be? I do not have much experience with circuits , and I have no idea what could be going wrong.
Any help is greatly appreciated.
Thnakyou.
Could anyone please guide me where could the problem be? I do not have much experience with circuits , and I have no idea what could be going wrong.
Any help is greatly appreciated.
Thnakyou.