Basic FAQ for FFT Analyzer

The FFT analyzer can select between two types of input coupling, AC coupling and DC coupling, just like a regular oscilloscope. DC coupling allows the input signal to pass through unchanged, while AC coupling cuts out the DC component and allows the AC component to pass. The signal is then input into an attenuator and amplifier.

The main uses of the two connections are as follows.

 

AC coupling

• When you want to accurately measure the AC component of a signal that contains DC components.
• When you want to measure the overall value (effective value) of the alternating current component only.
• normal acoustic vibration measurement
• When using the CCLD sensor.

 

DC Combination

• When you want to measure including DC (direct current) components.
• When you want to accurately measure low-frequency (below 1 Hz) alternating current components.