HFDA801L AC diagnostics with external signal

[Case K Kamada]

I check the below sequece to measure AC diagnostic with external signal.

 

Channel#1 case:

1. Input external signal
2. Write IB14=73h
3. Wait for (DB6[7] ==1)
4. Read DB9 as AC output load magnitude(DB6[6]==1) or error code(DB6[6]==0)

It would be more often in lower frequency and lower signal level, but it happens on higher frequency as well sometimes.

 

I think measurement will be done less than 100ms, but sometimes, even when I wait for 1000ms, DB6[7] would not turn to 1.

Is the above sequence is wrong? If so, could you correct my above sequence?