When a ‘ratio' value is programmed (the ratio set as the same ratio as the physical synchro or resolver under test), the ‘combined' angle reading for both the coarse and fine channel will be calculated and presented in the fine channel output register. If the coarse channel register is read, it will provide the coarse angle measurement. If the fine channel register is read, it will have the ‘combined' coarse/fine angle measurement, which is a more accurate representation of the coarse channel. For a more detailed explanation and examples, please read the Application Note on this subject. For GEN5 synchro/resolver measurement modules have a new “Combined” register 32-bits where the valid data is in the upper 24-bits. More information is provided in the Operations Manual.