The dimensions are as small as 162 (W) × 70 (H) × 260 (D) mm, and the weight is
only 1.7 kg including the battery. It is very convenient for outdoor use and
while on business trips.
This bandwidth covers those of W-CDMA, CDMA, PDC, PHS, GSM, 2.4GHz band wireless
LAN, Bluetooth.
When the battery is fully charged, Model 2650 operates for about 100 minutes
(with the back light turned off). It is extremely convenient for outdoor use and
for measuring wireless LAN installation environment.
Model 2650 guarantees a highly stable frequency axis by PLL synthesizer system.
The center frequency setting resolution is 100kHz. Furthermore, the average
noise level of -110dBm (typical) provides a wide dynamic range and the reference
level can be set in 1 dB step.
Measuring functions
Channel power measurement
Adjacent channel power measurement
Occupied bandwidth measurement
Electric field strength measurement
Magnetic field strength measurement
Calculation functions
MAX HOLD
MIN HOLD
AVERAGE
OVER WRITE
Marker and peak search
Save / Load
Electric field strength meas. ··· Optimum for
measurement of cellular phone and wireless LAN working
environment.
Magnetic field strength meas. ··· Optimum for EMI design
of PCBs and for evaluation of signal quality.
The center frequency is set at the spectrum of the maximum level in the 3.3GHz
band, and in addition, optimum reference level, resolution bandwidth, video
bandwidth and sweep time are set when the AUTO TUNE key is pressed. This
function is very convenient for measurement of an unknown signal.
The resolution bandwidth, video bandwidth and sweep time are automatically set
based on the frequency span. It is also possible to set auto range operation
only one or two out of resolution bandwidth, video bandwidth and sweep time.
Connect a printer (PT 2650 optional) and press the PRINT key on Model 2650. The
image on the screen is printed as it is.
The spectrum waveform is displayed at high resolution, 1000 points in the
horizontal axis, on the PC screen when "PC Software AK 2650" (optional) is used.
Measuring functions
Channel power measurement
Measures the sum of the power in the zone specified by the zone center and
zone width (slash area in figure). In short, it is possible to measure the
total power in the specified frequency band. Of course it is possible to
measure the noise power.
Occupied bandwidth measurement
It is possible to measure the occupied frequency bandwidth as the
bandwidth of the point that is lower by X (dB) than the peak level or as the
bandwidth of the point of Y (%) of the total power.
Adjacent channel power measurement
Capable of measuring the adjacent channel power leakage as the ratio of
the power in the range specified by offset frequency and bandwidth (slash
area in figure) to the carrier wave power. Both the upper and lower side
power leakage are measured.
Furthermore, the method for measurement may be selected out of three
methods, i.e., total power method, reference level method and in-band
method, from the classification of definition of carrier wave power.
Electric field strength measurement
It is possible to measure the electric field strength by connecting a
dipole antenna (optional) to the input connector. A dipole antenna that
suits the use is available. AN301 is mainly for PDC 800MHz and GSM 900MHz
band, AN302 is mainly for PDC 1500MHz band, AN303 is mainly for PHS, W-CDMA
and GSM 1800 / 1900MHz band, and AN304 is mainly for 2.4GHz wireless LAN and
Bluetooth. AN304 is capable of measuring direct sequence spread spectrum,
frequency hopping and Bluetooth system by 10 ms sweep time and MAX HOLD
function.
Magnetic field strength measurement
Model 2650 is capable of precisely measuring the magnetic field
distribution on an LSI or a printed circuit board using magnetic field probe
PR 26M. As the magnetic field detection portion of PR 26M is of a shielded
loop structure that adopts glass ceramic multi-layer board technology of
excellent high frequency characteristics, it is possible to take measurement
at high reproducibility by detecting magnetic field components only.
The conventional method covering low frequency through high
frequency with a single antenna results in low antenna gain because of using
a range deviating from the antenna resonance point, and the dynamic range
largely worsens as a result.
The measuring frequency range is as broad as
10MHz to 3GHz, and the measured value is calibrated in the instrument.
The Model 2650, however, provides an antenna for
each frequency band and uses a resonance point of high gain only, and
accordingly, it is capable of securing a wide dynamic range. Antennas of
other bands will be also prepared if requested.
As the electric field strength is calibrated for each
antenna in Model 2650, it is possible to directly read the measured value.
Evaluation of effectiveness of the bypass
capacitor located at the power supply terminal of an LSI and evaluation of
wiring rule on a printed circuit board can be raised as typical use of PR
26M. PR 26M is not affected by adjacent patterns because of high space
resolution.
Marker and Peak Search
Marker measurement
Two different modes are available for marker measurement. One is normal
marker mode to measure and display the frequency (maximum effective number
of digits : 7) and level (maximum effective number of digits : 3) of the
marker point, and another is delta marker mode to measure and display the
frequency difference and level difference between two markers (one of which
is a reference marker).
Peak search
Two different modes are available for peak search. One is normal peak
search mode to search for the peak level with all of 10div of the frequency
axis as the search range, and another is in-zone peak search mode to search
for the peak level in the range specified by the center value and width.
NEXT search (search for the next smaller level) of up to 9 is permitted in
the normal peak search mode. The marker moves to the peak level at each
sweep in the in-zone peak search mode.
Normal marker measurement
Normal peak search
Delta marker measurement
Zone peak search
Auto Tuning
The search for the signal of the maximum level in
the 3.3GHz band is executed and the result is displayed in the
specified frequency span when the AUTO TUNE key is pressed. The
spectrum is tuned to the vicinity of the center of the screen, and
the reference level, resolution bandwidth, video bandwidth and
sweep time are automatically set at optimum values.
This function is very convenient when used for measurement of an
unknown signal.
Auto Range
Resolution bandwidth, video bandwidth and sweep time are set automatically
based on the specified frequency span. Furthermore, it is also possible to
automatically set one or two of either resolution bandwidth, video bandwidth and
sweep time.
The operator is released from troublesome operation because
these three parameters that accompany the frequency span are set automatically.
Save/Load
It is possible to save 100 traces and 100 setups.
The load is one trace and one setup. This function may be used
when various data are acquired and they are evaluated later, or
when it is wanted to make a comparison with formerly acquired
data. The saved traces and setups can be transferred to a PC
through RS-232C.
Hard copy of display
Hard copies of the image on the screen can be
produced if a printer (model PT 21650, optional) is connected,
using RS-232C (optional), to the RS-232C connector of this
instrument.
Printing begins when the PRINT key is pressed. The printer is of
dual power supply scheme, i.e., AC adapter and battery, and it is
possible to easily produce hard copies of measured data even
outdoors where no AC power supply is available. The operating time
of the battery-powered printer is about 30 minutes (when used
continuously), and it is possible to produce about 80 hard copies
of images on the screen.
High resolution display on the PC screen
Although the spectrum is displayed by 250 points
on the horizontal axis on the spectrum analyzer screen, it is
fetched by 1000 points per sweep in the instrument. When PC
Software (AK 2650, optional) is used, all of these 1000 points are
transferred to a PC (the maximum transfer rate is 38,400 bps) and
are displayed on the PC screen. The image, therefore, becomes
clearer. Furthermore, setup of spectrum analyzer can be made from
the PC side.
Calculation Functions
Max hold
The update spectrum data is compared with that of last time for each point
of the X-axis, and the larger one is retained and displayed. The number of
times of sweep can be set in the range from 2 to 1024 times by steps, which
is a power of 2, or by infinite. It is possible to observe burst signal and
frequency drift.
Average
Simple averaging processing is executed at each sweep. The number of times
of averaging can be set from a range of 2 to 256 times by steps, which is a
power of 2. The signal components buried in the noise can be measured.
Min hold
The update spectrum data is compared with that of last time for each point
of the X-axis, and the smaller one is retained and displayed. The number of
times of sweep can be set in the range from 2 to 1024 times by steps, which
is a power of 2, or by infinite.
Over write
The image on the screen is not cleared for each sweep, and overwriting
display is executed. It is, therefore, possible to observe the process of
changes in the signal.
