Anritsu MS2651B Manual de usuario

MS2651B/2661B

Spectrum Analyzer

9 kHz to 3 GHz

For various applications

Portable at Only 11 kg

In the latest radio communications systems, the develop-

ment of improved frequency efficiency and sophisticated

digital functions are emphasized. The MS2651B/2661B

portable spectrum analyzers are ideal for analyzing the

signals of above systems, device and related equipment.

They are fully synthesized spectrum analyzers covering

a wide frequency range from 9 kHz to 3 GHz. They have

superior basic performance such as high C/N ratio, low

distortion, and high frequency/level accuracies and are easy

to operate. In addition, they use resolution bandwidth filters

with a much better selectivity than previously possible. The

large selection of options is available to handle a wide

range of applications at reasonable cost.

The MS2661B is designed for manufacture and installation

of radio equipment and devices, while the MS2651B is

meant for maintenance applications.

■Compact and lightweight

(11 kg in standard configuration)

●Easy portability for installation and maintenance

■High C/N and superior distortion characteristics

●Measurement speed improved by using 100 dB log

dynamic range

■Easy-to-use, simple operation

●Built-in “Measure” function for evaluation of radio equip-

ment (Frequency counter, C/N, channel power, adjacent

channel power, occupied frequency bandwidth, burst aver-

age power and template pass/fail function)

●User-defined function

●Zone marker/zone sweep

●Two-screen display

●FM demodulation waveform display

●Memory card interface (for saving/recalling trace data and

parameter and for saving screen image in bitmap format)

■Options support wide range of applications

●High stability crystal oscillator

●Narrow resolution bandwidth (MS2661B only)

●High-speed time domain sweep

●Trigger/gate circuit

●AM/FM demodulator

●Pre-amplifier

●Centronics interface (can not be installed with GPIB simul-

taneously)

●QP detector

●Television monitor

●DC coupled input (MS2661B only)

●Tracking generator

●75 Ωinput

●75 Ωtracking generator

■Easy to set up automatic measurements

●Controller function built-in (PTA)

●Built-in RS-232C and GPIB (standard)

●Various application software

●Small and weighing only 11 kg

The MS2651B/2661B are compact and lightweight, measur-

ing 320 (W) ×177 (H) ×351 (D) mm and weighing only 11

kg. In addition to benchtop use, they can be carried easily

for field use, making them the ideal choice for manufactur-

ing and maintenance of radio equipment.

●Synthesized local oscillator

The synthesized local oscillator design permits stable mea-

surement without disturbance due to frequency drift of the

spectrum analyzer itself. The level stabilizes in 30 minutes

after power-on, making these units especially suitable for

on-site maintenance and adjustment where work must be

completed quickly.

●Counter with 1 Hz resolution

A full complement of frequency counter functions are pro-

vided. Resolution is a high ±1 Hz even at full span, and

high-speed frequency measurements can be performed.

The high sensitivity compared with ordinary counters makes

it easy to select one signal from many and to determine its

frequency.

Compact, Lightweight, and Powerful

●Superior distortion characteristics

The MS2661B boasts extremely low harmonic distortion

levels, including a second harmonic distortion of –75 dBc*1

and a two-signal third order intermodulation distortion of

–80 dBc*2making it suitable for measuring harmonic com-

ponents and for evaluating the non-linearity of high-power

amplifiers.

*1200 MHz to 1.5 GHz, mixer input: –30 dBm

*2100 MHz to 3 GHz, frequency difference between signals:

≥50 kHz, mixer input: –30 dBm

●100 dB display dynamic range

In measurements requiring a wide dynamic range

such as adjacent channel power measurements, the

MS2651B/2661B can display more than 80 dB on a single

screen.

●Highly-accurate measurement

Auto-calibration ensures an overall level accuracy of within

±1.3 dB.

A span accuracy of 2.5% and 501 sampling points ensure

accurate occupied frequency bandwidth and adjacent chan-

nel power measurements.

●High C/N ratio

Excellent noise sideband characteristics are required for

analysis of weak signals adjacent to strong signals. The

MS2661B has low noise sidebands of below –100 dBc/Hz

(10 kHz offset), making it suitable for measurement of adja-

cent channel power of both analog and digital radio commu-

nication equipment.

Frequency measurement (1 Hz resolution)

Noise sidebands measurement (10 kHz offset)

Two-signal third order intermodulation

Occupied bandwidth measurement

●MS2651B for maintenance,

MS2661B for manufacturing

The optimum applications for the MS2651B and MS2661B

are maintenance and manufacturing, respectively, owing to

their basic performance such as noise sidebands, average

noise level and distortion free dynamic range. The

MS2651B is a good choice where there is no need to

measure parameters such as adjacent channel power

or harmonic distortions. High frequency/level accuracy

and 1 Hz-readout-resolution counter which are required

especially for maintenance are common features to the

MS2651B and MS2661B. The MS2661B is best for manu-

facturing. It is capable of highly-accurate measurement of

adjacent channel power, harmonic spurious components,

and in-band spurious components, and can also be used

for development.

Model MS2651B MS2661B

Noise sideband*1≤–90 dBc/Hz ≤–100 dBc/Hz

Averagenoiselevel*2≤–110 dBm ≤–115 dBm

2nd harmonic: 2nd harmonic:

>70 dB >80 dB

(100 to 500 MHz) (200 to 500 MHz)

3rd intermodulation 3rd intermodulation

distortion: distortion:

>76.6 dB >83.3 dB

(10 to 1000 MHz) (100 to 1000 MHz)

Maximum

distortion free

dynamic range

(RBW: 1 kHz)

–60

–90

–80

–70

–60

–50

–40

–30

–20

–40 –20 0 +20

*11 GHz, 10 kHz offset

*21 MHz to 1 GHz, RBW: 1 kHz, VBW: 1 Hz, RF ATT: 0 dB

2nd harmonicdistortion

Two signals 3rd order

intermodulation distortion

MS2661B

MS2651B

100 MHz to 3 GHz

800 MHz to 1 GHz

200 MHz to 1.5 GHz

Average noise level

10 MHz to 3 GHz

100 MHz to 1.5 GHz

Distortion characteristics

Mixer input level (=input level – RF ATT)

Average noise level (dBm)

Distortion relative value (dB)

●Simple operation

Users require ease of operation in a wide variety of con-

texts. For greater ease, in addition to simplifying the panel

keys and key layout, also menu page configuration is well

organized and “page-learning”as well as “user-defined”

functions have been added to minimize the steps required

for a given procedure.

●Bright color screen

A 5.5" bright color TFT LCD is used to display scales, mea-

sured waveform data, settings and other information in dif-

ferent easy-to-read colors. Each color can be changed if

required. When the soft key display is turned off, the scale

area enlarges to 180 (W) ×80 (H) mm, comparable to an

8" CRT.

●Radio equipment evaluation functions

(“Measure” functions)

A full range of functions including measurement of power

levels, frequencies, adjacent channel power, and mask and

time template measurements are provided for performance

evaluation of radio equipment. Key operation is simple and

high-speed calculations make the measurement fast and

efficient.

Convenient Easy-to-Use Functions

Burst average power measurement

Mask measurement

Channel power measurement

Adjacent channel power measurement

Time template measurement

●FM-demodulated waveform display function

This function displays FM-demodulated waveforms with an

accuracy of 5% over the range ±10 kHz to ±1 MHz. When

used with high-speed time domain sweep (Option 04) and

trigger/gate circuit (Option 06), frequency deviation of the

modulated signal, and frequency switching times of radio

equipment and VCOs, can be measured.

●Zone markers and multimarkers

Zone markers can be set automatically at the peak signal

within a given marker range, enabling quick measurement.

By using the multimarker function, automatic measurements

can be performed at up to ten marker points, and the

results displayed in a table. Multimarkers have functions

for harmonic measurements, highest 10 points and manual

setting.

●Zone sweep and multi-zone sweep functions

Sweeps can be limited to zones defined by zone markers

reducing sweep time. This zone sweep function can be

combined with “measure”functions such as “noise measure”

which can direct readout the total noise power within the

zone, and reduces measurement time greatly. The multi-

zone sweep function enables up to ten zones to be swept.

●Multi-screen display

The Trace A and Trace B waveforms are superimposed on

the same screen, and two spectra with different frequencies

are displayed simultaneously. In addition, it is possible to

simultaneously display spectrum and time domain screens

for the same signal. The multi-screen display permits effi-

cient signal level adjustment and harmonic distortion mea-

surement, too. Furthermore, in addition to being able to

display amplitude in the time domain, it is also possible to

display the FM demodulation waveform.

Spectrum and FM-demodulation waveform

Multimarker (highest 10 points)

Multimarker (harmonics measurement)

Multi-zone sweep

Two traces with different frequencies

Spectrum and time domain measurement 7

●User-defined functions

Measurement programs downloaded to the spectrum ana-

lyzers from a personal computer or memory card can be

executed by defining menu keys. The measurement pro-

gram is executed simply by pressing the predefined key,

with no further operation. Other panel and function keys

can also be predefined in the same way.

Measurement pro-

grams definition (down-

loaded from personal

computer)

User-defined menu

Panel and function

keys definition

●Screen image bitmap saved to memory card

Instead of printing a hard copy of the screen, it is also pos-

sible to save the screen image data to a memory card in

bitmap format. Editing the saved bitmap data using a PC,

makes report writing easy.

When the mode to save the

screen image in the bitmap for-

mat to the memory card is

selected as a copy method at

the hard copy function, just one

press of the copy key saves the

screen image as a bitmap format

to the memory card. And the file

number of each saved file is

incremented automatically.

The screen image data can also

be saved to the memory card

using the save function. In this

case, the file number of the

saved file can be specified.

Full Range of Options

Full lineup of options to select required performance and

functions with minimum capital investment

●To boost basic performance

Reference crystal oscillator (Option 01)

Adding the optional reference oscillator with a stability of 2

×10-8/day and 1 ×10-7/year, increases the accuracy of fre-

quency measurements even further.

Narrow resolution bandwidth (MS2661B only, Option 02)

Adding the option for a resolution bandwidth of 30 Hz, 100

Hz and 300 Hz greatly improves frequency resolution.

Pre-amplifier (Option 08)

The pre-amplifier improves the sensitivity (noise figure) of

the spectrum analyzer, and is best used when studying

interference signals and other low-power signals. It covers a

frequency range from 100 kHz to 3 GHz.

●For testing digital mobile communication

equipment

High-speed time domain sweep (Option 04)

Testing of TDMA-type radio equipment includes time

domain (zero-span) measurements of antenna power, tran-

sient response characteristics of burst transmissions, trans-

mission timing, and other quantities. The high-speed time

domain sweep option boosts sweep time to 12.5 µs and

resolution to 0.025 µs. This option must be used with the

trigger/gate circuit (Option 06).

Trigger/gate circuit (Option 06)

Burst signal and TV signals etc. can be stably measured

using the trigger function in time-domain measurements.

One of the external, video wide IF video, line or TV is selec-

table. This makes a variety of TDMA radio equipment tests

possible, including template comparison using pre-trigger

and post-trigger delay functions, and gate spectrum analy-

sis using the gate sweep function. Previously, the trigger

output from an external detector was required in gate spec-

trum analysis. However, this option for the MS2651B/2661B

has a 20 MHz wide IF video trigger function, eliminating the

need for trigger output from an external detector.

Low-power signal measurement using RF pre-amplifier

High-speed time-domain measurement (TS=12.5 µs)

Wide IF video trigger function

Wide IF video trigger and gate functions

●For CATV maintenance

75 Ωinput (Option 22)

Converts RF input impedance to 75 Ω(100 kHz to 2.5 GHz)

75 Ωtracking generator (Option 23)

For 75 Ωoutput

AM/FM demodulator (Option 07)

Demodulates AM/FM signals, enabling audio monitoring

using internal speaker or earphones.

This is useful for distinguishing between signals and inter-

fering spurious.

Television monitor (Option 16)

This option displays TV (NTSC or PAL) signals. When used

with the AM/FM demodulator (Option 07), audio signals can

be monitored simultaneously. With addition of high-speed

time domain sweep (Option 04) and the trigger/gate circuit

(Option 06), measurement of CATV parameters such as

carrier level/frequency, C/N, modulation, distortion, hum and

low-frequency interference etc. becomes possible.

●For measurement of filter frequency

response and antenna impedance response

Tracking generator (Option 20) covers a frequency range

of 9 kHz to 3 GHz at levels of 0 to –60 dBm while tracking

generator (Option 23) covers 100 kHz to 2.5 GHz at levels

of +44 to +104 dBµV.

●Superior frequency/level stability

The synthesized local oscillator permits stable measure-

ment of narrow-band crystal filters without disturbance by

drift. Moreover, the bandwidth of bandpass filters can be

measured accurately by using the occupied bandwidth

measurement function after sweeping.

●Multimarkers

Markers can be displayed at up to 10 points by using the

multimarker function even while the tracking generator is in

use. Furthermore, by setting the zone marker width other

than spot, fine adjustment of the marker position is unnec-

essary because the peak or dip within the zone is located

automatically.

NTSC TV waveform

Bandpass filter measurement

Example of dip marker

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