1.kaynak:
NETWORK ANALYZER
i.
ii.
iii.
iv.
v.
vi.
Measure components, devices, circuits and subassemblies
contain source and multireceiver
measure ratioed amplitude and phase response (freq sweep and power sweep)
offer advanced error correction
harder to get an accurate trace (result) on display but it is easy to interpret the result.
always looking for known signal (stimuls -response system)
SPECTRUM ANALYZER
i.
ii.
iii.
iv.
v.
Measure amplitude (magnitude) characteristic, carrier level, sideband , harmonics and
phase noise
can demodulate(& measure) complex signals
are receiver only(single channel)
can be used for scalar component test(no phase) with tracking generator or external
source
much wide range of IF bandwidth.
NETWORK ANALYZER
Devreleri,bileşenleri, alt sistemleri ölçer
Kaynak ve çoklu alıcı içerir
Faz cevabını ve ışıyan genliği ölçer(frekans
taraması ve güç taraması yapar.)
ileri düzeyde bir hata düzeltme sunar
Ekranda hasas bir sonuç almak zordur fakat
sonucu yorumlamak kolaydır.
Her zaman bilinen tanınan sinyal aranır
SPECTRUM ANALYZER
Genlik karakteristiğini, yan bandları,
harmonikleri, faz gürültüsünü, taşıyıcı
seviyesini ölçer
Komplek sinyalleri ölçüm yada demodüle
edebilir.
Sadece receiver a sahiptir.(tek kanallıdır.)
Sayısal bileşenlerin testi için kullanılır. Cihaz
jeneratör veya dış kaynakla skaler bileşen
testi (herhangi bir faz yokken) için
kullanılabilir
IF bandgenişliğinin çok geniş bölümüne
sahiptir.
2.kaynak:
Spectrum Analyzer
A spectrum analyzer is a device used to examine the spectral composition of some electrical,
acoustic, or optical waveform.
Often, it measures the power spectrum.
There are analogue and digital spectrum analyzers:
An analogue spectrum analyzer uses either a variable bandpass filter whose mid-frequency is
automatically tuned (shifted, swept) through the range of frequencies of which the spectrum is
to be measured or a superheterodyne receiver where the local oscillator is swept through a
range of frequencies.
A digital spectrum analyzer uses the Fast Fourier transform (FFT), a mathematical process
that transforms a waveform into the components of its frequency spectrum. As a result,
computer programs can compute such transforms, and makes audio processing easier. FFTs
have applications in much wider fields.
Some spectrum analyzers (such as Tektronix's family of "real-time spectrum analyzers") use a
hybrid technique where the incoming signal is first down-converted to a lower frequency
using superheterodyne techniques and then analyzed using FFT techniques.
Network Analyzer
A network analyzer is an instrument used to analyze the properties of electrical networks,
especially those properties associated with reflection and transmission of electrical signals
known as s-parameters. Network analyzers are used mostly at high frequencies; a typical unit
can make measurements from a few hundred kilohertz up to several gigahertz.
The two main categories of Network Analyzers are
Scalar network analyzer (SNA) - amplitude properties only
Vector network analyzer (VNA) - both amplitude and phase properties; also called gain-phase
meter
VNAs are the most common type of Network Analyzer. References to a 'network analyzer'
most often mean a VNA since an SNA is functionally identical to a spectrum analyzer in
combination with a tracking generator.
A new category of Network Analyzers has also been developed for the measurement of nonlinear microwave signals:
Large signal network analyzer (LSNA) - both amplitude and phase of the fundamental and
harmonics are acquired
The microwave transition analyzer (MTA) was historically commercialized before the LSNA
but was lacking some of the user-friendly calibration features now available with the LSNA.
Source(s):
http://en.wikipedia.org/wiki/Spectrum_an…
http://en.wikipedia.org/wiki/Network_ana…