Truly portable solution for quick and
precise spectrum analysis
B&K Precision’s 2650A series handheld
spectrum analyzers are compact, light weight,
and cost-effective spectrum analyzers for quick
and precise signal investigations, especially away
from the bench. At a weight of only 1.8 kg
(4 pounds), the 2650A series are by far the
lightest full-featured spectrum analyzer
available, yet they deliver performance and
features comparable to full-size bench spectrum
analyzers and can operate up to 4 hours on a
single battery.
With their ease of use, measurement flexibility,
and unmatched portability, the 2650A series
analyzers are indispensible tools for engineers
and technicians who conduct field measure-
ments in the 50 kHz to 8.5 GHz range.
Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A, 2658A
Technical data subject to change
© B&K Precision Corp. 2012
Data Sheet
www.bk precision.c om
Tel.: 714.921.9095
Applications
■Installation, maintenance, and troubleshooting
of wireless communication systems such as
W-CDMA/CDMA, GSM, WLAN, WiMAX and
Bluetooth
■Frequency response measurements of passive
components such as RF cables, filters, and
attenuators (model 2652A)
■Detection of signal interference and undesired
emissions
■TV and broadcasting
■Antenna alignment
■Electric field strength measurement with dipole
antennas optimized for typical frequencies used
in wireless systems (order M401-M406)
■Magnetic field strength measurement with
magnetic field probe (PR 26m)
Key features and benefits
■Frequency range from 50 kHz – 3.3 GHz or
8.5 GHz
■A truly portable spectrum analyzer weighing
only 1.8 kg including the battery
■Impressive 4 hour battery life; easy-to-replace
rechargeable Lithium-Ion battery
■Built-in tracking generator to rapidly determine
transmission characteristics of 2 port devices
(model 2652A)
■USB interface for PC connectivity
■Intuitive PC Software for remote control and
documentation of measurement results
■Conveniently store measurement results and
screen shots in bitmap format to USB flash
drive (USB host interface)
■Large easy-to-read color display (TFT LCD),
640 x 480 resolution
■Measurement functions: channel/adjacent
channel power, occupied bandwidth, electric
and magnetic field strength
■Convenient Auto Tune function automatically
sets center frequency to the maximum signal
within full span and optimum settings for RBW,
VWB and sweep time
■External trigger for zero span measurements
■SCPI-like remote control commands
Superb performance improves your
productivity
Advanced synthesizer-based design enables the
2650A series to provide you with an accurate
and detailed picture of the spectrum you are
investigating.
■Fast sweep speed, minimum 10 ms, to help
locate and identify elusive, transient
interference signals
■DANL (displayed average noise level) of
-127 dBm
■Single sideband phase noise – 90 dBc @
100 kHz offset
2650A 50 kHz – 3.3 GHz
2652A 50 kHz – 3.3 GHz
with Tracking Generator
2658A 50 kHz – 8.5 GHz
Model Frequency Range
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Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
RF Input (N-connector), able to withstand
27 dBm (CW average power)/25V DC max
Simple menu-based operation via
soft keys
Automatically tune to maximum
level with full span
Set sweep time and detection mode
2, 5 and 10 dB/div
Store screen images in bitmap format
to flash drive or hard copy to USB
printer
Enter custom labels for filenames,
set the time and date
Set reference level from +1 dBm
to -60 dBm in 1 dB steps
Measurement functions:
• Channel power
• Adjacent channel power
• Occupied bandwidth
• Electric field strength
• Magnetic field strength
Calculation functions:
• Max hold
• Min hold
• Averaging
• Overwrite
Marker measurement and peak
search
Save/Load trace data and setups
to/from internal memory or USB
flash drive
Rotary knob for parameter selection
External trigger
input (SMA)
Large color screen (640 x 480 pixels) can be
switched to high contrast monochrome display
in extreme sunlight
USB host adapter for
USB flash drives
PC interface - USB
device (A plug)
Charge status indicator
DC power input
Front panel
▲
Interface
▲
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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
▲
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.
Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
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Max and Min Hold
Max Hold: At each displayed frequency, the
currently-measured value is compared to the
previously-measured value and the larger one is
retained and displayed. This feature is useful for
observing a bursted or intermittent signal or for
measuring the electric field strength of systems
using direct sequence spread spectrum/frequency
hopping modulation techniques.
Min hold: At each displayed frequency, the
currently-measured value is compared to the
previously-measured value and the smaller one is
retained and displayed.
In both cases, the number of sweeps can be set
to 2N, where N is from 1 to 10 or infinite.
Calculation and Marker functions
▲
Averaging
The analyzer continuously sweeps, then
calculates and displays the average value over the
total number of sweeps. The number of sweeps
can be set to 2N, where N is from 1 to 10.
Averaging is useful for detecting signals buried in
the noise floor because random noise is averaged
out.
Marker Function
Two different modes are available for marker
measurements:
■Normal marker mode measures the
frequency and level of the marked point
■Delta marker mode measures the frequency
and level differences between the two
markers (see image)
Overwrite
The results of each consecutive sweep are
displayed and the screen is not cleared after each
sweep. This lets you observe the long term
variations of a signal.
Peak Function
Two different modes are available for peak
search:
■Normal peak search mode searches for the
highest level on the screen. In this mode, you
can also use the NEXT button to locate the
marker on the next smaller peak.
■In-zone peak search mode searches for the
peak level in the range specified by the center
value and width.
The picture shown demonstrates in-zone peak search.
Delta marker measurement
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Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
Easy operation
▲
Simple and flexible documentation of your measurements
▲
The 2650A series handheld spectrum analyzers
are straightforward to operate and provide many
functions to facilitate quick and easy
measurements:
Smart one button “Auto Tune" function which
automatically scans the full frequency range,
detects and centers the maximum signal, and
configures optimum values for RBW, VBW,
sweep time and reference level
Long battery life
The 2650A provides a battery operating time of
up to 4 hours (approximatly 3 ½ hours with
back light set to typical settings). Battery
replacement is simple and doesn’t require any
hand tools. To fully charge the lithium-ion
battery takes only approximately 4 hours
(analyzer must be turned off). A two color LED
indicates the charging status “charging”, “charge
completed”, “no battery detected” and “charging
error”.
Conveniently save measurement data
to USB flash drive
Easily save and recall measurement data and set-
tings in CSV format directly to and from the USB
flash drive. Filenames can be customized and
have a time and date stamp. Users can choose
to store measurement data and setups in sepa-
rate files or combined in one file.
Using the Copy function, a screen image in
bitmap format (BMP) can be directly stored to
the USB drive. CSV data residing in internal
memory can be stored to the USB drive in a
lump sum.
Hardcopy to USB printer
Generate a hard copy of the display by directly
connecting the optional USB printer model
PT2650A to the 2650A series analyzer.
PC software
The 2650A series includes easy-to-use software
for documentation and further analysis of your
measurements. Connect the analyzer via USB
cable to your PC, configure the analyzer remote-
ly, then download measurement data and instru-
ment settings for storage and further analysis.
■Continuously sweep and transfer trace data
to the PC.
Input attenuator and internal preamp are set
automatically to optimal values based on the
reference level
Easy configuration of frequency, span, and
amplitude
Marker and peak search functions enabling
rapid measurements
200 setups and reference spectrum
measurements can be stored and recalled from
either internal memory or USB flash drive
Filenames can be customized and include a
date and time stamp.
Large easy-to-read display. The backlight is
adjustable and monochrome mode can be
used for extreme lighting conditions
■Capture 1001 trace data points (twice the
number of display dots) and store the data in
CSV (comma separated values) format for
detailed analysis (e.g., import into a spread
sheet)
■Save the screen to a bitmap file or to the
clipboard
■Control all instrument settings from the PC
■Download custom antenna gain factor
compensation data to the instrument
Detect the maximum
level within full span.
Center the maximum signal, configure
optimum parameters
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Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
Spectrum Analyzer with Tracking Generator, 50 kHz – 3.3 GHz
Model 2652A
▲
Built-in transmission measurement
The 2652A is a 2650A with a tracking
generator added. The 2652A can be used to
rapidly determine transmission characteristics of
two-port RF devices.
Determine the gain characteristics of
an amplifier
Characterize the frequency response of an active
circuit such as an amplifier.
Return loss measurement
Measure the return loss of an electric component
or circuit with a VSWR bridge
Characterize the frequency response
of a filter
Measure the frequency response of a passive
component, e.g a filter, over the 2652A’s full
range of 5 MHz to 3.3 GHz.
Input (spectrum analyzer) Output (tracking generator)
Frequency range 5 MHz to 3.3 GHz
Output Level -10 dBm ± 1 dB @ 1
GHz (output level is fixed)
Output flatness ±1.5dB
Output impedance 50 Ω
Output connectors N (J)
Tracking generators are ideal for tuning filters,
determining the usable frequency range of
amplifiers and attenuators and aligning receiver
IF stages.
The tracking generator’s output frequency is the
same as the frequency the spectrum analyzer is
tuned to. This lets you see the amplitude
response of a circuit on the spectrum analyzer
screen.
RF INTG OUT
OUT IN
BPF
RF INTG OUT
OUT IN
VSWR bridge
RF INTG OUT
AMP
APPLICATIONS
The analyzer's normalize function can be used to
remove the effects of the cable(s) connecting the
device. This allows you to differentially measure
a device's response without worrying about cable
effects.
Tracking generator specifications
DUT
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Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
Specifications 2650A, 2652A 2658A
Frequency section
Frequency range 50 kHz to 3.3 GHz 50 kHz to 8.5 GHz
Center frequency
Setting 20 kHz
resolution Settable with rotary encoder, numeric or function key
Accuracy
within ± (30+20T) kHz±1 dot @frequency span: 200 kHz to
10 MHz, RBW 3 kHz, 23±5 °C within ± (60+300T) kHz±1dot
@frequency span: 20 MHz to max. frequency (3.3 GHz or
8.5 GHz), RBW 100 kHz, 23±5 °C
T: sweep time (s)
RBW frequency
error
within ±4 kHz @ 3 kHz, 10 kHz, 30 kHz
within 20% of RBW @ RBW: 100 kHz, 300 kHz
within 10% of RBW @ RBW: 1 MHz, 3 MHz
Frequency span Range
0 Hz (zero span),
200 kHz to 2 GHz (1-2-5 step) and
3.3 GHz (full span)
0 Hz (zero span),
200 kHz to 5 GHz (1-2-5 step) and
8.5 GHz (Full span)
Accuracy within ±3% ±1dot @ sweep time of 0.3s, 23±5 °C
Display resolution
# of points per trace
501dots on LCD screen, 1001dots readout via PC
(501 dots are visible on the display, 1001 dots of trace data are captured internally
and can be transferred to a PC via USB device interface.)
Resolution
Bandwidth 3 dB bandwidth
Range 3 kHz to 3 MHz (1-3 sequence) and AUTO
Accuracy ±20%
Selectivity 1:12 (typical, 3 dB : 60 dB)
Video bandwidth 100 Hz to 1 MHz (1-3 step) and AUTO
SSB phase noise -90 dBc/Hz (typical) @100 kHz offset, RBW : 3 kHz, VBW : 100 Hz, sweep time: 1 s
Spurious response less than -60 dBc
Harmonics less than -40 dBc @ ≥100 MHz
Amplitude section
Reference level
Range +10 to -60 dBm (1dB step)
Accuracy within ± 0.8 dB ± 1 dot @ center frequency : 100 MHz, RBW : 3 MHz,
VBW : 1 MHz, REF : -15 dBm, 23±5 °C
Unit dBm, dBV, dBmV, dB V, dB V/m, dB A/m
(dB V/m and dB A/m are used for measurement functions)
Average noise level -127 dBm (typical) @ CF : 1 GHz, RBW : 3 kHz, VBW : 100 Hz,
Ref. level < - 40 dBm ( preamp automatically ON)
Frequency response within ±2.0 dB ± 1 dot @50 kHz to 100 MHz
within ±1.0 dB ± 1 dot @100 MHz to max. frequency (3.3 GHz or 8.5 GHz)
Input impedance 50 Ω
Input VSWR < 2.0
Input attenuator Operating range 0 to 25 dB (1 dB step), coupled with reference level
Switching error ±0.6 dB @100 MHz
RBW switching error ±0.6 dB
Display resolution (vertical) 381 dots/10 div
Display scale
Scale 10 dB/div, 5 dB/div, 2 dB/div
Accuracy ±(0.2 dB+1dot)/2 dB ±(0.4 dB+1dot)/5 dB
±(0.8 dB+1dot)/10 dB ±(1.8 dB+1dot)/83 dB
Input damage level +27 dBm (CW average power), 25 VDC
Sweep section
Sweep time
Range
(1-3 step)
10 ms to 30 s and AUTO
@frequency span : 0 to 2 GHz
30 ms to 30 s and AUTO
@frequency span : full span
10 ms to 30 s and AUTO
@frequency span : 0 to 2 GHz
30 ms to 30 s and AUTO
@frequency span : 5 GHz, full span
Accuracy
Within ±0.1 % ±1 dot
@frequency span: 0 to 2 GHz
within ±1.5 % ±1 dot @ full span
Within ±0.1 % ±1 dot
@frequency span: 0 to 5 GHz
within ±2.5 % ±1 dot @ full span
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Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
v072513
Sweep section (cont.)
Trigger
Trigger mode AUTO (Available only for zero span)
Trigger source Internal and External
External
trigger
Input voltage range 1 to 10 Vp-p
Frequency range DC to 5 MHz
Input coupling DC coupling
Trigger level approx. 0.56 V(fix)
Input RC approx. 10 kΩ / less than 15 pF
Input damage level ±50 V(DC+AC peak)
Input connector SMA(J)
Detection mode Positive peak, Negative peak, Sample
Function
Marker
measurement
NORM displays frequency (8 digits max) and level (4 digits max) at marker point.
DELTA displays frequency difference and level difference between two markers.
Peak search NORM: searches peak point within 10div (full freq. range). This mode also supports NEXT peak ( up to 10).
ZONE: searches peak point within a zone designated by center and width
Calculations
NORM, MAX HOLD, MIN HOLD, AVERAGE, OVER WRITE
MAX/MIN HOLD: 2 to 1024
AVERAGE: 2 to 256
Measurements Measure Channel power, Adjacent channel leakage power, Occupied frequency bandwidth,
Electric field strength (requires antenna), Magnetic field strength (requires magnetic field probe).
Auto tuning Automatically scans the full bandwidth, sets center frequency to the maximum signal within full span and
centers it onscreen. Automatically adjusts reference level, RBW, VBW and sweep time to optimum values
Save/Load Save Saves 200 reference spectrum measurements and 200 setups
Load Loads one reference spectrum measurement and one setup
General
RF Input connector N(J) connector
USB
Communication
Protocol USB version 1.1 (will also work with USB 2.0 devices)
Device Connector B plug
Transfer rate 12 Mbps
Hard copy USB printer (option) connected to A plug (host) enables hard copy of screen.
Host connector A plug
Display
Display 5.7 inch color TFT LCD
Backlight LED backlight
Number of dots 640(H) x 480(V) dots
Power supply
Dedicated Input : 100 to 240 VAC
AC adaptor Output : 9 VDC/2.6 A
Lithium-ion battery 7.4 V/5000 mAh Li-Ion battery (MB400)
Charge function Capable of charging during power-off.
Indicates 4 conditions with two color LED
Charge indicator 5 level indicator of remaining battery charge
Environmental and Size
Operating temperature 0 to 50° C (guaranteed at 23±10 °C, without soft carrying case)
Operating humidity less than 40 °C/80 %RH (guaranteed at less than 33 °C/70 %RH, without soft carrying case)
Storage temperature -20 to 60 °C, less than 60 °C/70 %RH
Dimensions 6.38 (W) x 2.80 (H) x 10.43 (D) inch, 162(W) x 71(H) x 265(D) mm (excluding projections,
protection bumper and stand)
Weight approx. 1.8 kg or 4 lbs (including battery)
Three-Year Warranty
Included Accessories User manual, AC adaptor MA400, soft carrying case LC2650A, accessory pouch, PC software and USB cable,
Lithium-Ion battery MB400, certificate of calibration.
Optional Accessories Dipole antennas M401 – M406, magnetic field probe PR 26M, printer PT2650A and extra roll paper PX2650A
