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We have DC LOD detect enabled and when the current is set above 120nA the Lead off detect work great. However when we run the impedance test for IEC60601-2-27 Section 201.12.1.101.3, we get a flat line. Only when we lower the current do we past the impedance test but the LOD does not work.
The test steps are
1. apply 3.8 mV sine wave at 0.67 Hz and 40hz. Record the results. (we pass)
2. Now add 620 kohm in parallel with 4.7nf between the signal source and the device. ( we get the expected sinewave)
3. Now add 300 mvDC, (we get a flat line, expected sinewave)
4. Now add -300 mvDC, (we get the expected sinewave)
Our circuit input to the ADS1293
