AVL F-FEM-CON User Manual

Operation
74
F-FEM-CON — User’s Guide
4.7.3 Accuracy of the Frequency Synthesis
Different frequency errors occur during frequency synthesis, depending on the
value (frequency or duty cycle) that is varied. These errors include:
 Frequency errors: caused by quartz inaccuracy and quantization (limited
resolution due to limited counter width)
 Duty-cycle errors: caused by quantization (limited resolution due to limited
counter width)
The selected update rate does not have an impact on the frequency generated,
but should be in a sensible relation. For example, it does not make sense to
generate frequencies of several Hz and then have them recalculated every milli-
second.
As a rule of thumb:
The errors and their interrelationships are shown in the diagrams below.
Relationship between Duty-cyle errors and frequency:
Output Frequency > Update Frequency
Fig. 52

AVL F-FEM-CON Specifications

General

Brand	AVL
Model	F-FEM-CON
Category	Measuring Instruments
Language	English