LeCroy 9400A Manual page 25

FFT BRINGS STRONG SPECTRAL ANALYSIS CAPABILITIES
TO THE 9400A
POWERFUL PERFORMANCE IN A WIDE RANGE
OF APPLICATIONS
The versatility and performance of the WP02-FFT
package with the 9400A make it an ideal tool for a
variety of applications such as:
Electronic engineering - As a very high performance
spectrum analyzer it is extremely useful for measuring
phase noise, characterizing filters, amplifier bandwidth
roll-off, or harmonic distortion.
Communications - The FFT analyzer is ideal for
characterizing HF links, modems and data links, cable
TV, PCM, fiber optics, etc.
Acoustic devices - Covers the entire audio spectrum
in one FFT operation from 25 kHz downwards with
2 Hz resolution.
Preventive maintenance systems - With a motion
transducer (accelerometers/velocity and/or
displacement transducers), the 9400AWP02 package
can be used to analyze the vibration signatures of
rotating and reciprocating machinery for early
detection of wear or damage.
Non-destructive test engineering - The high
bandwidth and sampling rate of the 9400A, together
with its long memories, make it a valuable instrument
for ultrasound non-destructive testing. "Long record
FFTs" provide unprecedented spectral resolution,
hence improved characterization of the material under
test, and much shorter measuring times.
X- (FFT (2))
.2MHz 10mY
Ch 1 20 mV ~
T/dry 20 ~s Ch 2>~] mV
Trlg- 1.56 dLv + CHAN 2 =
A 2 MHz signal is frequency modulated with a 99 kHz sine wave. To
improve the signal-to-noise ratio on the phase-incoherent FM signal,
spectral averaging of 64 spectra is used (bottom trace). The part
the spectrum at the right-hand side is the 2nd harmonic of the carrier
with sidebands.
Long records allow higher sampling rates, to reduce aliasing. A
110 kHz square wave is recorded over 1250 and 6250 points with
sampling rates of 200 and 40 nsec/point respectively. The bottom
trace, a short record transform, has considerable aliasing whereas
the longer record transform (top) is alias-free.
The FFT menu documents all the relevant parameters.
LeCroy
Innovators in Instrumentation
LeCROY CORPORATE HEADQUARTERS
700 Chestnut Ridge Road
Chestnut Ridge, NY 10977-6499
Telephone: (914) 425-2000
TWX:(710) 577-2832
Fax: (914) 425-8967
LeCROY EUROPEAN HEADQUARTERS
2, rue Pr@-de-la-Fontaine
P.O. Box 341
1217 Meyrin 1-Geneva, Switzerland
Telephone: (022) 719 21 11 Telex: 41 90
Fax: (022) 782 39
Other sales and service representatives throughout the world.
Copyright @ March 1990. LeCroy is the registered trademark of LeCroy Corporation. All rights reserved, information in this publication supersedes all earlier versions. Specifications subject
to change without notice.
TOS 013/003