User Manual

4.1 Selecting the Function
82
Real-Time Saving
Function
Recommended for long-term measurements such as those that exceed the
instrument’s internal storage capacity. Measurements are recorded directly
onto storage media as a data recorder.
One hundred data samples per division are stored directly to the internal hard drive, MO
drive or PC Card while measuring.
When finished measurement, the whole waveform is compressed and saved as well. Be-
cause the timebase is limited by the selected recording media, we recommend having the
optional Model 9718 HD Unit installed when the fastest timebase is needed.
Features:
• Long-term recording independent of memory capacity
• The whole waveform (compressed data) is saved, so you can quickly search for any
desired portion within a large quantity of recorded data.
FFT Function
Recommended for performing frequency analysis of rotating objects, vibrations,
sounds and etc.
Spectral analysis and transfer functions are available.
Input signal data is subjected to FFT calculation and frequency analysis.
An input module equipped with anti-aliasing filtering (AAF) should be used when acquir-
ing data for FFT analysis, to suppress the effects of aliasing distortion while sampling.
Refer to the Analysis Supplement for FFT function details.
Function Description
Input
A/D
Conversion
Saved
directly while
measuring
Saved when
finished
measuring
Saved to storage media
Sampling Period
Max.
Min.
(1/100 of time t)
Time t
Measurement
Waveform
Max.
Min.
Whole
waveform
Input
A/D Conversion
FFT Calculation
Frequency