LeCroy 9400A Manual page 24

FEATURES
Long Record Transforms - Extremely long record
FFTs (up to 25,000 points) provide significant
signal-to-noise ratio improvement on single
phenomena.
Wide Band Frequency Domain Analysis - Covers
wide DC to 175 MHz bandwidth with high
resolution in the frequency domain.
High Sampling Rates - Up to 5 gigasamples/sec
effectively eliminates atiasing errors.
Broad Spectrum Coverage - Executes FFTs over
record lengths as long as 25,000 data points
giving up to 12,500 spectral components at almost
any sampling rate.
Dual Input Channels - Both input channels can be
analyzed simultaneously to allow comparison of
independent signals for common frequency-
domain characteristics.
Fast Processing - FFTs are processed and
displayed rapidly, e.g. a 1,250 point waveform is
transformed in less than 1.75 sec, a 50 point
waveform within 300 msec.
Versatile Display Formats - Frequency-domain
data may be presented as magnitude, phase, real,
imaginary, log-power, Iog-PSD (power spectral
density); and all may be selected via menu options
after signal capture.
Standard Window Functions - Rectangular for
transient signals; von Hann (Harming) and
Hamming for continuous waveform data; Flattop for
accurate amplitude measurements; Blackman-
Harris for maximum frequency resolution.
User-definable Window Functions - Specially
defined window functions can be loaded over GPIB
and stored in the 9400A's reference memories.
Calibrated Vertical Scaling - Flattop truncation
window provides precisely calibrated vertical
scaling for all spectral components.
Frequency Domain Averaging - Averages up to
200 FFT results to reduce base-line noise and
allows analysis of phase-incoherent and non-
triggerable noisy signals.
Time Domain Averaging - Can increase the
dynamic range up to 72 dB or more when
averaging real-time signals prior to FFT execution.
Offset dithering helps to improve dynamic range
and reduces ADC non-linearity effects.
Frequency Cursors - Cursors give up to 0.008%
frequency resolution and measure power or
voltage differences to 0.2% of full scale.
Automatic DC Suppression - DC signal
components may be suppressed automatically
prior to FFT execution (menu selected).
Full Documentation - The 9400A Digital
Oscilloscope status in the Frequency Domain is
fully documented on one comprehensive display
page specifying Nyquist frequency, number of
points, vertical scaling, window function, etc.
Chaining of Operations - Chains two operations
automatically, e.g. Function F = FFT of
(CH1 X CH2). Any number of operations may
performed sequentially, either manually or via
remote control.
Full Remote Control - All front-panel settings and
waveform processing functions are programmable
via GPIB and/or RS-232-C interfaces. Acquired
and processed waveforms can be downloaded to a
computer and can later be retrieved and displayed
on the 9400A.
Color Archiving - Provides color hard copies of
the screen, using a wide range of digital plotters.