DFR0030 EC Meter Waveform

Account cancelled 2017-09-15 03:37:42 1165 Views1 Replies
I've hooked up a DFR0030 EC Meter to an oscilloscope and am watching the analog output from the signal pin. The signal goes up, then decays all the way back to zero, then jumps up again (see attachment).

Any idea what is causing this? I have measured the supply voltage and it is stable (at 5 V).

Thanks!

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2017-09-28 18:32:06 Where did you put the probe? Was it in water, if it is put in the air, the oscilloscope shows square wave. robert.chen