What's the difference between parts "FDA801-VYT"and parts "FDA801B-VYT"?

[ZJian.2]

We found that they came from different manuals, but we compared the two manuals and found no differences.Please tell us the difference between parts "FDA801-VYT"and parts "FDA801B-VYT"?

[valeria]

FDA801B includes 'DIM' - digital impedance meter function (in addition to already embedded diagnostic functions in FDA801). DIM gives a calculation of the value of connected load in digital format on I2C