Atec Keithley-2820 - Manual (Page 3)

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2820 RF Vector Signal Analyzer
400MHz to 4GHz or 6GHz
Discover the Flexibility of Three
Powerful operating Modes
1. Spectrum Analyzer Mode—The Model 2820 has four multi-purpose
spectrum analysis functions for measuring the most common signal
parameters of RF signals.
– The Spectrum Analysis function displays the RF power vs. frequency
of all signals within a user-defined frequency span. A wide selection
of resolution bandwidths and filter types are available to analyze
the signal’s spectral characteristics. Traditional markers and marker
functions are used to measure the RF signal’s parameters.
– The ACPR (Adjacent Channel Power Ratio) function measures the
channel power of the primary signal along with that of adjacent
channels and next-adjacent channels. The channel frequency, channel
bandwidth, test limits, and adjacent channels are user-definable. Each
channel frequency is measured separately for high accuracy. When it’s
desirable to reduce test times, users can also choose not to measure
the adjacent and next-adjacent channels.
– The Channel Power List function allows setting up a pre-defined list
of frequencies, measurement bandwidths, and measurement times.
Triggering is commonly used to synchronize the list with other
instruments in a system.
– Using the Zero Span function, the analyzer becomes a fixed-tuned
receiver to capture and analyze signals up to 40MHz bandwidth at a
fixed carrier frequency. An RF signal is demodulated and the signal
power vs. time is displayed. A wide selection of bandwidths and filter
types are available and an assortment of triggers can be used to
capture the signal easily.
Use the adjacent channel Power Ratio function to define the test
parameters and the test limits for non-standards-based signals.
2. Vector Signal Analysis Mode—The Model 2820 is designed to be
combined with a variety of signal analysis personality options for testing
to the most common wireless standards, such as GSM, EDGE, W-CDMA
FDD, cdmaOne, cdma2000, 802.11 WLAN, and 802.16e mobile-WiMAX.
A robust set of measurements, instrument settings, and test limits
are customized for each of the various standards, saving instrument
configuration time and minimizing the potential for operator error.
For example, an ACPR measurement for each of the standards is part
of the signal analysis personality option.
Measure the key parameters of GSM and EDGE signals quickly and
easily with the Model 2820-GSM option. The GSM time mask is
shown here, along with the results of the signal measurement.
3. Signal Capture Capability – The Model 2820 can receive RF signals of
up to 40MHz bandwidth and store them in its 32 megasample waveform
memory as I-Q data pairs. A waveform record size of up to 30 seconds
can be captured at a one megasample/second sampling rate. The I-Q
data can be uploaded to a PC through the GPIB, USB, or LAN interfaces
for analysis or to playback with an RF vector signal generator. The signal
waveform can be analyzed with PC-based software such as MATLAB,
LabVIEW, or a variety of software applications from Keithley.
It’s easy to upload I-Q signal data pairs from the Model 2820 to a
Pc for analysis. The free vector Signal analyzer software application
shown here can be downloaded from www.keithley.com.