People have always valued crystals like quartz as a symbol of purity and good luck –quartz was used
as jewelry by the ancients and the crystal ball still represents good fortune. But today, quartz crystals
play another role in leading-edge electronics.For example, clear and reliable digital cellular phones
depend on the precise vibration of the quartz-crystal oscillator.
The worldwide proliferation of digital telephones requires ever-increasing capacity at even higher signal
frequencies, and relies on signal purity in specified bandwidths. Anritsu developed the MG3641A and
MG3642A Synthesized Signal Generators to meet the need for higher signal purity at higher
frequencies.These two generators cover frequency ranges from 125 kHz to 1040 MHz, and 125 kHz to
2080 MHz with non-harmonic spurious of only –100 dBc and a setting resolution of 0.01 Hz/0.01 dB.
A full lineup of easy-to-use versatile functions in a compact cabinet makes them essential tools for
high-frequency measurement at on-site maintenance, as well as in R&D.
0.01-Hz, 0.01-dB Setting Resolution
•
High Signal Purity (–100 dBc Spurious)
•
Versatile Modulation Functions
•
Excellent Carrier Wave Frequency Stability in FM Mode
•
Frequency and Level Sweeping
•
Large Memory for 1000 Panel Settings
•
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Superior
Basic Functions
High resolution and low spurious
•
Anritsu's synthesizer technology allows frequency to be set
with a resolution of 0.01 Hz across the full frequency range.
And the non-harmonic spurious is better than –100 dBc for
reliable measurement at any frequency.
fref
Excellent noise-free characteristics
•
A unique low-noise YIG oscillator produces a high-purity
signal with SSB phase noise of better then –130 dBc/Hz
(1 GHz, 20-kHz offset), making these signal generators
ideal for interference testing of radio receivers and as
sources for various local and reference signals.
Phase
detector
1/N.F
Synthesizer
control
YIG-OSC
ref x N.F
f
High-stable carrier frequency
•
The carrier frequency is produced by a high-stability crystal
oscillator and remains phase-locked even at frequency
modulation. Frequency calibration for testing FSK
modulation receivers, such as paging systems, is
unnecessary.
Frequency stability of carrier wave at frequency modulation
SSB Phase noise characteristic
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Superior level accuracy
•
Since the output signal is compensated precisely across the
full frequency range, the frequency-level characteristics are
very good. In addition, the quadruple-shielding construction
and high-accuracy/high-reliability step attenuator provide
accurate output down to the lowest levels.The superior level
accuracy enables precise measurement of high-sensitivity
receivers.
Output level frequency characteristics
High output
•
A stable signal with an output of +17 dBm can be output
across the full frequency range to drive a variety of local
signal sources and power amplifiers.In addition, an
over-drive level up to +23 dBm can be set to make full use
of the internal amplifier capability. If the amplifier output
power reaches the limit and the output power is insufficient,
a status message is displayed.This is useful for confirming
output limits.
Maximum output level
Output level accuracy
High resolution at level setting
•
Since the output level can be set with a resolution of 0.01
dB over the entire level range, these synthesizers can be
used as calibration signal sources for standards such as
power meters.
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Easy Operation and
Easy-to-Read Displays
Basic parameters displayed on large screen
•
Basic parameters, such as frequency, output
level, and memory address are displayed on an
easy-to-read large 7-segment indicator.
Simple displays for complex functions
•
Parameters like modulation and sweeping are set
using function keys under the multi-menu displays..
Initialization by Preset key
•
Panel settings are initialized by the [Preset] key and
the initialization contents can be tailored to the usage.
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One-touch relative display
•
The relative frequency and output level are displayed just
by pressing these one-touch keys.
Dedicated rotary encoder for output level
•
A dedicated rotary encoder and step keys for setting the
output level are arranged near the output connector to
increase/decrease the output level directly.
Internal reverse power protection
•
An internal reverse power protection circuit protects internal
circuits from damage even if a transceiver connected to the
output connector transmits by mistake.
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Versatile
Modulation Types
Three internal AF signal sources
•
Up to three internal AF signal sources are supported by
adding options to the standard sine-wave oscillator
(1 kHz, 400 Hz).The AF synthesizer (Option 21) is a digital
synthesizer that generates sine-wave, triangular, square,
and sawtooth waveforms; it can also be used as a function
generator as well as a modulation signal source.
All the AF sources have accurate frequencies because they
are synchronized to the reference signal in the same
manner as the carrier frequency. Moreover, they can be output from the AF output connector.
Ext 1Ext 2AF output
Int 1
400 Hz/1 kHz
Pulse modulation (Option 11)
•
High-speed pulse modulation is supported using an external modulation signal (TTL level).The output can be used
for various burst signals with an ON/OFF ratio of more than
80 dB, as well as a pseudorandom signal for radar.
Int 2
(option)
Int 3
(option)
Polarity
switching
Polarity
switching
Polarity
switching
Simultaneous AM and FM modulation
•
In addition to permitting simultaneous one-route AM and
two-routes FM modulation, the modulation factor and
polarity can be set independently.
The modulation signal can be selected from three internal
AF signal sources and two external input signals (Ext 1, Ext
2).
AM
depth
setting
FM 1
deviation
setting
FM 2
deviation
setting
AF
level
setting
AM modulator
FM modulator
Pulse modulation waveform (100 ns/div)
Pattern generator (Option 23)
•
Installing the Pattern Generator (Option 23) in the
MG3641A/MG3642A allows FSK modulation or pulse
modulation in combination with the FSK Encoder (Option
22) or Pulse Modulator (Option 11) without an external
instrument.
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Full Function
Lineup
Large memory
•
The large internal memory can save 1000 panel settings.
The front panel has a dedicated display for memory
addresses that can be recalled continuously using the knob,
or the step keys.
The 1000 address memory is divided into 20 blocks of 50
units and continuous recall can be selected for each block.
In addition, frequency settings can be continuously recalled
with no impact on other parameters.
Memory block management menu
Various sweep functions
•
Frequency and output level can be swept digitally for efficient
measurement of device frequency characteristics, input/
output linearity of various devices, and receiver spurious
response.
Difficult-to-set sweep parameters are set easily at the
multi-menu displays.
Sweep menu
Continuously variable output
•
The level of the output signal can be set continuously
without breaks over a 20-dB range.This is useful for testing
devices and circuits where hysteresis depends on the input
signal. Due to the 0.01-dB setting resolution, the level can
be changed with analog-like variation.
Memory address display
Offset display
•
The frequency and level of the actually output signal can be
offset against the settings and displayed values. And the
level at the output side of an amplifier or mixer connected to
the output connector can be displayed and set.
Offset display setting menu
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External Controller
GPIB
MG3641A/3642A
GPIB
Mixer
Level
Meter
GPIB
MG3641A/3642A
(Set to Frequency Talk Only Mode.)
MG3641A/3642A
(The frequency offset value is set to IF
frequency and the Listen Only Mode is set.)
Measurement of mixer characteristics using
Frequency Only Mode and frequency offset
Amplifier IM3 measurement using Level Only Mode
MG3641A/3642A
(Set to Level Talk Only Mode.)
MG3641A/3642A
(Set to Listen Only Mode.)
2 signal
characterristics
measurement pad
Amplifier
Spectrum
Analyzer
Remote Control
SCPI-standard GPIB commands
•
The GPIB control commands conform to the SCPI
(Standard Commands for Programmable Instruments)
recommendations. SCPI offers users common software for
configuring automatic measurement systems, because it
provides compatibility between different manufacturers.
GPIB Only-Mode linked operation
•
Two sets of the MG3641A/MG3642A can be linked and
operated without an external controller by using the
Frequency and Output Level Only modes.
The Frequency Only Mode is used for evaluating the
characteristics of mixers.
The Level Only Mode is useful for evaluating the crossmodulation characteristics of non-linear devices, such as
amplifiers.
GPIB Command conversion mode
•
Operation can be controlled using GPIB commands for the
earlier MG3633A or MG3631A/MG3632A Synthesized
Signal Generators by using the GPIB command conversion
function.This permits backwards compatibility with earlier
automated measurement software.
Note: Some commands cannot be converted due to functional differences.
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Specifications
• MG3641A/3642A (mainframe)
Range: 125 kHz to 1040 MHz (MG3641A), 125 kHz to 2080 MHz (MG3642A)
Resolution: 0.01 Hz
Accuracy: Reference oscillator accuracy;reference oscillator accuracy ±(0.3% of FM setting deviation + 5 Hz) at frequency modulation
Carrier frequency
OutputSwitching time: <50 ms (normal mode), <100 ms (level safety mode), <10 ms (continuous mode)
Signal purity<–140 dBc/Hz (10 to <256 MHz), <–136 dBc/Hz (256 to <512 MHz), <–130 dBc/Hz (512 to 1040 MHz),
Amplitude
modulation
Frequency
modulation
Internal reference oscillator
Frequency:10 MHz; Aging rate: ±5 x 10–9/day; Start-up characteristics: 1 x 10–7/10 min (for 24 h after power-on),
Temperature stability: ±3 x 10
External reference input: 5/10 MHz, ±10 ppm, ≥0.7 Vp-p/50 Ω (AC coupling), BNC connector (rear panel)
Buffer output: 10 MHz, TTL level (DC coupling), BNC connector (rear panel)
Switching time: <40 ms (external control, response time from last command until becomes within ±0.1 ppm of set frequency)
Range: –143 to +17 dBm (settable range: –143 to +23 dBm)
Units: dBm, dBµ, V, mV, µV (dBµ, V, mV and µV switchable between termination voltage display and open voltage display)
Resolution: 0.01 dB
Frequency characteristics (at 0 dBm): ±0.5 dB, ±1.0 dB (pulse modulation:on)
Accuracy: ±1 dB (–127 to +17 dBm, upper limit at pulse modulation
Impedance: 50 Ω (N connector), VSWR: <1.5 (≤–3 dBm), <2.5 (> –3 dBm)
∗Response time from last command until becomes within ±0.5 dB of final level
Special setting mode
Continuous mode:Variable within set value ±10 dB with no interruption of output
Safety mode: Prevent large spike signal generation when operating mechanical-type attenuator
Interference radiation: <0.1 µV (at output frequency), <1 µV (over entire frequency range, multi-menu display:OFF)
Spurious (CW mode, ≤+7 dBm)
Harmonics: <–30 dBc (2nd, 3rd)
Non-harmonic: <–100 dBc (≥15 kHz offset)
Those related power: <–40 dBc (<15 kHz offset)
SSB phase noise (CW Mode, 20 kHz offset):
300 Hz to 3 kHz demodulation band: <4 Hzrms (10 to <512 MHz), <8 Hzrms (512 to 1040 MHz), <16 Hzrms (>1040 MHz, MG3642A only)
50 Hz to 15 kHz demodulation band: <5 Hzrms (10 to <512 MHz), <10 Hzrms (512 to 1040 MHz), <20 Hzrms (>1040 MHz, MG3642A only)
Range: 0% to 100%
Resolution: 0.1%
Accuracy: ± (5% offset value + 2%)
Modulation frequency response (output: ≤+7 dBm)
0.4 to <0.5 MHz2 kHz (±1 dB bandwidth)1 kHz (±1 dB bandwidth)
0.5 to <2 MHz10 kHz (±1 dB bandwidth)5 kHz (±1 dB bandwidth)
2 to <32 MHz20 kHz (±1 dB bandwidth)
32 to <64 MHz50 kHz (±1 dB bandwidth)
≥64 MHz50 kHz (±1 dB bandwidth), 100 kHz (±3 dB bandwidth)
Distortion: <–40 dB (30% AM), <–30 dB (90% AM)
Incidental FM: <200 Hz peak
Modulation signal source: One of internal (Int 1, Int 2, Int 3) and external (Ext 1, Ext 2)
Modulation signal polarity: Positive/negative switchable
Range:
0 to 125 Hz (125 to <250 kHz)0 to 25.6 kHz (16 to <32 MHz)
0 to 250 Hz (250 to <500 kHz)0 to 51.2 kHz (32 to <64 MHz)
0 to 500 Hz (0.5 to <1 MHz) 0 to 102 kHz (64 to <128 MHz)
0 to 1 kHz (1 to <2 MHz)0 to 256 kHz (128 to <256 MHz)
0 to 2 kHz (2 to <4 MHz)0 to 512 kHz (256 to <512 MHz)
0 to 4 kHz (4 to <8 MHz)0 to 1024 kHz (512 to 1040 MHz)
0 to 10 kHz (8 to <16 MHz)0 to 2048 kHz (>1040 MHz, MG3642A only)
Resolution:
1 Hz (0 to 4 kHz deviation)250 Hz (102.25 to 256 kHz deviation)
10 Hz (4.01 to 10 kHz deviation) 500 Hz (256.5 to 512 kHz deviation)
25 Hz (10.025 to 25.6 kHz deviation)1 kHz (513 to 1024 kHz deviation)
50 Hz (25.65 to 51.2 kHz deviation)1 kHz (1025 to 2048 kHz deviation, MG3642A only)
100 Hz (51.3 to 102 kHz deviation)
∗
1
–8
(0 to +50˚C)
∗
∗
2
: +12 dBm), ±3 dB (<–127 dBm)
2
∗At 25 mm from cabinet measured with 25 mm diameter loop antenna (2 windings) terminated at 50 Ω
∗≥0.4 MHz, ≤+7 dBm, ≤90% AM, source: Int 1 (1 kHz), 300 Hz to 3 kHz demodulation band
Upper limit frequency
AM: 30% AM: 90%
Lower limit frequencyCarrier frequency
DC: External DC coupling
(±1 dB bandwidth)
20 Hz: External AC coupling
(±1 dB bandwidth)
∗≥0.4 MHz, ≤+7 dBm, source: Int 1 (1 kHz)
∗≥0.4 MHz, ≤AM: 30%, ≤+7 dBm, source: Int 1 (1 kHz), 300 Hz to 3 kHz demodulation band
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Accuracy: ± (5% offset value + 10 Hz) (0.4 to <512 MHz), ± (5% offset value + 20 Hz) (512 to 1040 MHz)
Modulation signal source (FM1, FM2): One of internal (Int 1, Int 2, Int 3), and external (Ext 1, Ext 2)
Modulation signal polarity: FM1, FM2 positive/negative switchable
Pulse modulation
According to option specifications
Internal modulation (Int 1)
Frequency:400 Hz, 1 kHz
Accuracy: Same as reference oscillator accuracy
Modulation Internal modulation (Int 2, Int 3): According to option specifications
signal sourceExternal modulation (Ext 1, Ext 2)
Frequency sweep (start/stop): Linear (specified step size and number of points), Log (multiplying factor: 1%)
Frequency sweep (center/span):Linear (specified step size and number of points)
Level sweep (start/stop, center/span):dB (specified step size and number of points)
Memory sweep: Start/stop
∗Sweep: continuous mode (max. 20 dB width)
Sweep mode: Auto, single, manual
Sweep functionSweep time
Setting range: 1 ms to 600 s/point
Resolution: 10 µs/point
TemperatureOperating: 0˚ to +50˚C, Storage: –30˚ to +71˚C
Dimensions and
mass
320 (W) x 177 (H) x 451 (D) mm, ≤20 kg
EN61326: 1997/A2: 2001 (Class A)
EMCEN61000-3-2: 2000 (Class A)
EN61326: 1997/A2: 2001 (Annex A)
LVDEN61010-1: 2001 (Pollution Degree 2)
∗1: Can be changed to 5 x 10
–10
/day using reference crystal oscillator (Option 01)
∗2: Only with pulse modulator (Option 11) installed
∗3: External DC coupling: DC, External AC coupling: 20 Hz
∗4: Specify a nominal voltage of either 100 V and 240 V when order ing; the maximum operating voltage is 250 V.
∗
3
to 100 kHz (≥10 MHz) ∗±1 dB bandwidth
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Options
•
Option 01Frequency:10 MHz
ReferenceAging rate: 5 x 10
OscillatorTemperature stability: ±5 x 10
–10
/day
–9
(0˚ to +50˚C)
Frequency:125 kHz to 2080 MHz
On/off ratio: >80 dB
Rise/fall time: <100 ns
Option 11
Pulse Modulator
Min. pulse width: <500 ns
Pulse repetition rate: DC to 1 MHz
Max. delay time: <100 ns
Overshoot, ringing: <20%
Video feed-through: <20%
Pulse modulation input: 50/600 Ω, TTL (positive logic), BNC connector (rear panel)
Option 21Resolution: 0.01 Hz
Frequency:0.01 Hz to 400 kHz (sine-wave), 0.01 Hz to 50 kHz (triangular, square and sawtooth wavefor ms)
AF SynthesizerWaveform:Sine-wave, triangular, square and sawtooth wavefor ms
Frequency accuracy:Same as reference oscillator accuracy
Frequency shift
1
, Data 20) = (0, 0): –frequency deviation setting, (Data 21, Data 20) = (0, 1): –frequency deviation setting/3,
(Data 2
1
, Data 20) = (1, 0): +frequency deviation setting, (Data 21, Data 20) = (1, 1): +frequency deviation setting/3
(Data 2
Frequency set
Free:Frequency shift simultaneously with data input
Rise trigger: Frequency shift at external clock rise time
Option 22Fall trigger: Frequency shift at external clock fall time
FSK EncoderBaseband filter
Filter type: 10-th order Bessel filter
Cut-off frequency: 100 Hz to 30 kHz (–3 dB)
Setting resolution: Upper 2 digits
Frequency deviation accuracy: Depends on frequency modulation deviation accuracy of mainframe (at by-pass to baseband filter)
External modulation input
• MX364001B Software for Pattern Generator Data Write
Read-out dataDOS text file
Write memoryData pattern memory (defined: 1 to 4), idle pattern memor y (idle)
Contents ofTop address of output: 0 to 65,535 (any settable)
write dataData bit length:2 to 524,288 bits (bit length of patter n data automatically calculated and recorded
Personal Computer
OSMicrosoft®Windows 95
InterfaceGPIB (National Instruments PCI-GPIB or PCMCIA-GPIB)
Pattern data: 2 to 524,288 bits/memor y (text format file)
Data name: Max. 8 characters (idle pattern memory not named)
IBM PC/AT compatible
®
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Ordering
Information
Please specify model/order number, name, and quantity when ordering.
Model/Order No.
Mainframe
MG3641ASynthesized Signal Generator125 kHz to 1040 MHz
MG3642ASynthesized Signal Generator125 kHz to 2080 MHz
Standard Accessories
Power Cord, 2.5 m:1 pc
B0325GPIB Connector Shielded Cap:1 pc
F0013Fuse, 5 A:2 pcsFor 100 Vac
F0012Fuse, 3.15 A:2 pcsFor 200 Vac
W1137AEMG3641A/3642A Operation Manual:1 copy
NameRemarks
MG364[ ]A-01Reference OscillatorAging rate: 5 x 10
MG364[ ]A-11Pulse ModulatorPulse repetition rate: DC to 1 MHz
MG364[ ]A-21
MG364[ ]A-22
MG364[ ]A-23
MX364001B
J0576BCoaxial Cord (N-P · 5D-2W · N-P), 1 m
J0127ACoaxial Cord (BNC-P · RG58A/U · BNC-P), 1 m
J0007GPIB Cable, 1 m408JE-101
J0008GPIB Cable, 2 m408JE-102
MP51APadDC to 200 MHz, 75 Ω→50 Ω
MP52APadDC to 200 MHz, 50 Ω→75 Ω
MA1612AFour-point Junction Pad5 to 3000 MHz
MP721[ ]AttenuatorDC to 12.4 GHz
B0395CRack Mount Kit EIA/IEC
B0329GFront Cover 3/4MW 4U
B0412ACarrying CaseWith casters and B0329G front cover
B0330BTilt Bail3/4MW 450D
∗
1
∗
1
∗
1
∗
2
Options
AF Synthesizer0.01 Hz to 400 kHz, resolution: 0.01 Hz
FSK Encoder2 or 4 levels FSK
Pattern Generator
Application Software
Software for Pattern Generator Data WriteMicrosoft®Windows 95
Optional Accessories
–10
/day
®
∗1: Up to two units of Option 21, 22 or 23 can be installed.
Combinations
Option 21 Option 21 Analog modulation of two tones, such as a tone squelch test
Option 21 Option 22 FSK modulation by external data input and analog modulation
Option 21 Option 23
Option 22 Option 23 FSK modulation by internal data pattern
∗2:The following items must be provided by the user to use the MX364001B.
IBM PC/AT
GPIB interfacePCMCIA-GPIB or PCI-GPIB or equivalent GPIB interface manufactured by National Instr uments Inc., suppor ting NI-488.2
Microsoft Windows 95 is a registered trademark of Microsoft Corporation in the USA and other countries.
IBM AT is a registered trademark of Inter national Business Machines.
NI-488.2 is a registered trademark of National Instruments Inc.
®
PC486DX4 (75 MHz or faster) with 32 MB RAM min. (recommended) running Windows 95®OS
15
®
Page 16
Specifications are subject to change without notice.