Manual

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Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
Occupied Bandwidth
This measurement calculates the bandwidth
containing the total integrated power occupied in
a given signal bandwidth. Two measurement
methods are available: The user can specify N%
of total power or the X dB down point relative to
the carrier peak level.
Channel power measurement
Allows you to measure the total power or
noise power in a user-specified
bandwidth.
Versatile measurement functions
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Adjacent channel power
Measure the ratio of power leakage (from the
wanted signal) into adjacent channels. Center
frequency, adjacent channel bandwidth, and
offset between main carrier and adjacent
channels can be set.
Users can select from any of the following three
measurement methods based on the reference
carrier definition: total power (of displayed spec-
trum), peak power (reference level) and in-band
power (user-specified band width).
Since the antenna gain factor compensation data
is preloaded into the analyzer, the field strength
is displayed directly in dBuV/m. The analyzers
also support downloading of user-defined gain
factor tables for custom antennas.
Typical applications of this magnetic field probe
are evaluation of the effectiveness of a bypass
capacitor located near the power supply terminal
of an IC or evaluation of the microstrip layout on
a PCB. Due to the probe’s high spatial
resolution (approximately 0.25 mm), it is not
affected by adjacent patterns.
Electric field strength measurement
A dipole antenna (options M401 – M406)
connected to the RF input enables the measure-
ment of electric field strength. Users can choose
from 6 antennas based on the frequency range
under investigation. Each antenna’s resonance
point is optimized for the frequency spectrum of
a specific wireless standard:
• M401 is suitable for GSM 850/900
• M403 for W-CDMA and GSM 1800/1900
• M404 for 2.4 GHz wireless LAN and
Bluetooth
• M406 for 5 GHz wireless LAN
Combined with the MAX HOLD function and a
10 ms sweep time, the M404 dipole antenna is
capable of measuring the electric field strength of
Magnetic field strength measurement
Using a magnetic field probe (option PR 26M),
the 2650A series is capable of accurately
measuring the magnetic field distribution on a
PCB (printed circuit board) or IC (integrated
circuit). The magnetic field strength detector
inside the probe consists of a shielded loop
structure using a glass ceramic multi-layer board
technology with high frequency characteristics.
This enables the detection of magnetic field
components only. The probe can measure over a
wide frequency range of 10 MHz to 3 GHz.
Since the probe’s compensation data is already
preloaded into the analyzer, the magnetic field
strength is displayed directly in dBuA/m.
Bluetooth systems and systems using direct
sequence spread spectrum/frequency hopping
modulation techniques.
Using multiple dedicated dipole antennas leads
to better measurement results compared to the
conventional method of using only a single wide
band antenna in which case the frequency range
under investigation is typically located far away
form the antenna's resonance point, resulting in
poor dynamic range. Measuring at or near the
resonance point where the antenna gain is at a
maximum translates into high dynamic
measurement range.