NF FRA5014, Instruction Manual

Page: 18 / 107

1.4 Operation Principles
FRA5014 1-6
•
Oscillator
The
FRA5014
’s oscillator uses a D/A (digital to analog) converter and filter to convert digital
sine wave signals into analog signals. Lastly, DC bias is added prior to output.
•
Analyzer
In the analyzer, response signals from the system under test are modified in size, etc., as needed
by a signal conditioner, then are converted to digital signals by an A/D (analog to digital)
converter. The sub processor performs multiplication and integration operations using the
response signal and orthogonal reference signals (Sin, Cos) to obtain two orthogonal signal
components, which is to say signal vectors. This process attenuates frequency components that
do not match the signal frequency, thereby enabling precise measurement even when a lot of noise
is present.