ADVANTEST U3751 Service Manual

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U3751
U3751 Spectrum Analyzer
Compact Size and High Performance
An 8 GHz Spectrum Analyzer Based on a New Concept
Frequency range: 9 kHz to 8 GHz
High accuracy: ±0.8 dB between 10 MHz and 3.1 GHz
Standard configuration includes:
10 MHz to 8 GHz pre-amplifier
Two-channel USB interface
LAN port
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The U3751 is a portable 8 GHz spectrum analyzer that can be used in digital appliance produc­tion lines, in installation and maintenance of CATV and wire­less LAN hotspots, and for a va­riety of other purposes. The U3751 provides high-speed throughput twice
*
1
as high as that provided by our conventional models. It also contributes to reduced tact time, an important consideration in equipment in­stallation on production lines.
Conventional system throughput time of 875 ms is reduced by more 60%
*
1
to 350 ms in the
U3751 (on GPIB)
*
2
. This increased speed helps greatly to reduce test costs on production lines and other facilities.
Calibration is an essential requirement for improved accuracy of measurement data. With the latest techniques in circuit in­tegration, the U3751 requires less calibration time and fewer calibration steps.
High Throughput
High Speed Calibration
With a digital IF section and ADVANTEST's original circuit technologies, the U3751 provides remarkably high overall am­plitude accuracy:
±0.8 dB (10 MHz to 3.1 GHz) ±1.0 dB (3.1 to 8 GHz)
Upper limits and lower limits can be set for limit lines on the U3751 screen, thereby enabling the discriminator to make PASS/FAIL judgments on trace data.
Higher Overall Amplitude Accuracy
PASS/FAIL Judgment
Measuring time
Measuring
time
Our conventional model
ADC Digital RBW Digital Det
Digital IF Block
RF Input
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U3751-1E Jan. ’05
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With a digital interface, the U3751 has superb power meas­urement repeatability, guarantee­ing a overall amplitude accuracy of ±0.8 dB or better. In addition, the U3751 is designed to operate with batteries and warm up with­in five minutes, offering ease of use outdoors and in the field.
In its standard configuration, the U3751 has a built-in pre-amplifier for boosting the signal level to a maximum of 8 GHz. This helps in analysis of faint signals of 5 GHz or more, such as those in wireless LAN, ETC, or similar systems.
Noise level:
-135 dBm at 5 GHz, typ. (Pre-Amp. ON)
The U3751 supports three types of power: AC (100 V/200 V), DC (+11 V to +17 V), and power from a battery pack. The battery pack can be detached and easily replaced with a spare.
Highly Sensitive Measurement
Operating Time of 2.5 Hours
*
3
with the Battery Pack
The U3751 can warm up within five minutes. It requires less time to reach its operating tem­perature and can quickly be prepared for highly accurate measurement.
A screenshot can be saved to a USB memory device by simply specifying USB as the COPY device using soft keys. The U3751 supports the BMP and PNG formats for saving data. This feature enables measurement data to be gathered and pas­ted into reports in a PC environment. (USB version 1.1 is supported.)
Five-Minute Warm-Up
USB Interface Included in the Standard Configuration
Time
Stable measurement
*1: Comparison with our conventional models *2: In a sample setup where channel power measurement results are transferred with
certain frequency and span settings specified
*3: Typical value at room temperature and without any option attached
Our conventional model
5
min.
U3751-1E Jan. ’05
3
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U3751-1E Jan. ’05
Functions for Full-Fledged Analysis
RMS Detection Supported
For more accurate power measurement of broadband modula­tion, the U3751 supports RMS detection as well as conven­tional sample detection. With RMS detection and digital IF technology, the U3751 is a portable spectrum analyzer capable of highly accurate power measurement.
The U3751 is a complete spectrum analyzer containing all of our high-frequency measuring technologies. It combines the analysis functions of a full-featured spectrum analyzer with ease of operation. The U3751 can handle all kinds of measurement demands on its own.
Three-Trace Independent Detection
The U3751 has a function for displaying three independent traces performed simultaneously and a variety of wave-detec­tion modes (RMS, peak, sample, et al.). The combination of the function and the calculation methods listed above facili­tates such tasks as antenna adjustments.
Pre-Amplifier for Signal Boosts up to 8 GHz
The U3751 includes a pre-amplifier for boosting the signal level to a maximum of 8 GHz, enabling highly sensitive mea­surement.
Noise level: -135 dBm at 5 GHz typ. (Pre-Amp. ON)
Channel Setting Function
The channel setting function is useful for measuring telecom­munication and broadcast channels over radio waves. The U3751 has two types of channel setting methods: calculation and table. The channel setting function can handle differences among broadcast channels in various countries.
ISDB-T channel power measurement sample Sample of simultaneous Posi/RMS/Sample traces
Measurement sample of a faint 5.8 GHz signal Bluetooth channel measurement sample
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U3751-1E Jan. ’05
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Various Measurement Functions
Harmonics Measurement Function
The harmonics measurement function of the U3751 is suitable for high-frequency testing of radio devices. With input of the frequency of a fundamental wave or setting of a marker, the U3751 can easily be used to make a high-frequency measure­ment.
Marker functions:
Multi-marker (10 markers)/delta marker/peak search
Different types of detectors:
Normal, Posi, Nega, Sample, RMS
Zoom Functions
A window and F-F mode are used for easy analysis of a specific signal from a broadband measurement. RBW settings can be changed, so broadband and narrowband analyses of measured signals can be performed quickly. In addition, F-T mode, T-T mode, and other types of signal analysis are available.
ACP Measurement Function
This function measures ratios between carrier power and adja­cent channel power. Up to five adjacent channels can be speci­fied, and channel bands can be specified.
Spectrum Emission Mask Function
PASS/FAIL judgment made with spectrum masks or limit lines is a good way to increase productivity in the production of dig­ital appliances. The Spectrum Emission Mask (SEM) function facilitates measurement of licensed radio waves on wireless LANs and other media.
Other measurement functions:
Channel power, Total power, Average power, OBW, ACP, Spectrum emission mask, Spurious measurement, Noise-Hz conversion, frequency counter, and more
Sample of harmonic distortion measurement on a transmitter with a 400 MHz
bandwidth
Dual-window broadband and narrowband measurement sample
3GPP ACLR measurement sample IEEE802.11b S.E.M measurement sample
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U3751-1E Jan. ’05
Specifications
Frequency
Frequency range: 9 kHz to 8 GHz
Frequency band: 9 kHz to 3.1 GHz (Band 0)
3.0 to 8 GHz (Band 1)
Preamplifier: 10 MHz to 8 GHz
Frequency reference
Aging: 2 x 10
-6
/year
Temperature stability: 2.5 x 10
-6
(0 to 50°C)
Frequency counter
Resolution: 1 Hz to 1 kHz
(RBW: <100 kHz, input signal level: >-50 dBm, CW and single signal)
Frequency stability
Residual FM (zero span): <60 Hz p-p/100 ms
(internal frequency reference)
Frequency span
Range: 0, 10 kHz to Full
Accuracy: <±1% of Span Spectrum purity: -85 dBc/Hz, offset: 10 kHz; span: <200 kHz Resolution bandwidth
Range: 300 Hz to 3 MHz (1-3 steps)
RBW accuracy: ±12% Video bandwidth range: 10 Hz to 3 MHz (1-3 steps)
Sweep
Sweep time
Sweep time: 20 ms to 1000 s (spectrum mode)
50 µs to 1000 s (zero span)
Accuracy: <±2% (zero span) Sweep mode: REPEAT, SINGLE Trigger
Source: Free, Video, EXT, IF
Amplitude range
Measurement range: Noise to +30 dBm Maximum input level: Input attenuator: 10 dB
+30 dBm (preamplifier off) +13 dBm (preamplifier on)
±15 VDC max. Input attenuator range: 0 to 50 dB by 10 dB steps Display range: 100, 50, 20, 10, 5 dB, Linear Unit: dBm, dBmV, dBµV, dBµVemf, dBpW, W, V Reference level range: -140 to 40 dBm Detector: Normal, Posi-peak, Nega-peak, Sample, RMS
Amplitude accuracy
Calibration signal
Frequency: 20 MHz Level: -20 dBm Accuracy: ±0.3 dB
Scale fidelity
Log: ±0.5 dB/10 dB
±0.5 dB/80 dB
±0.2 dB/1 dB Level measurement accuracy:After Cal., preamplifier: off;
temperature range: 20 to 30°C;
input attenuator: 10 dB; REF: 0 dBm;
and input signal level: -10 to -50 dBm
±1.5 dB (
9 kHz to 10 MHz)
±0.8 dB (
10 MHz to 3.1 GHz)
±1.0 dB (
3.1 to 8 GHz)
Dynamic range
Displayed average noise level: Frequency: 10 MHz to 8 GHz;
Ref. level: <-45 dBm; RBW: 300 Hz Band 0, preamplifier: off: -118 dBm + 2 f (GHz) dB Band 1, preamplifier: off: -117 dBm + 1 f (GHz) dB Band 0, preamplifier: on: -133 dBm + 3 f (GHz) dB Band 1, preamplifier: on: -134 dBm + 1.3 f (GHz) dB
Gain compression (1 dB): Frequency: 10 MHz to 8 GHz
Preamplifier: off: >-8 dBm Preamplifier: on: >-25 dBm
Second harmonic distortion: <-70 dBc (preamplifier: off;
mixer level: -40 dBm; frequency: >200 MHz)
<-75 dBc typ. (preamplifier: off;
mixer level: -30 dBm; frequency: >300 MHz)
Third order intermodulation: -50 dBc (frequency: 10 MHz to 8 GHz;
preamplifier: off; mixer level: -20 dBm;
2-signal separation: 200 kHz)
Image/Multiple/ Out-of-band response: <60 dBc (image suppression: ON) Residual responses: <-80 dBm (frequency: 10 MHz to 8 GHz;
preamplifier: off)
Inputs/Outputs
RF Input
Connector: N type female Impedance: 50(nominal) VSWR:
<1.7 : 1 (<3.0 GHz), input attenuator: >10 dB
<2.0 : 1 (>3.0 GHz), input attenuator: >10 dB
Calibration output
Connector: BNC female Impedance: 50(nominal) Frequency: 20 MHz Level: -20 dBm
Frequency reference input
Connector: BNC female Impedance: 50(nominal) Frequency [MHz]: 1, 1.544, 2.048, 5, 10, 12.8, 13, 13.824, 14.4,
15.36, 15.4, 16.8, 19.2, 19.44, 19.6608,
19.68, 19.8, 20, 26
Level: 0 to +16 dBm
External trigger input
Connector: BNC female Impedance: 10 k(nominal), DC coupled Trigger level: 0 to +5 V
21.4 MHz IF Output Connector: BNC female Impedance: 50(nominal) Level:
Approx. mixer input level: +10 dB (at 20 MHz)
Battery mount
Connector: Antonbauer QR mount
External DC input
Connector: XLR-4 Voltage range: +11 to +17 V
GPIB: IEEE-488 bus connector USB: USB1.1 Video output Connector: D-sub 15-pin female LAN Connector: RJ45 type, 10/100 base -T
General specifications
Operating environment range
Temperature: 0 to +50°C Humidity: Relative humidity: 85% or less
(without condencation)
Storage environment range:
-20 to +60°C, Relative humidity: 85% or less
AC power input:
Automatic switching to 100 VAC or 200 VAC 100 VAC: 100 to 120 VAC, 50/60 Hz
200 VAC: 200 to 240 VAC, 50/60 Hz DC power input: DC: +11 to +17 V Power consumption: 100 VA or less (A.C. operation)
70 W or less (D.C. operation) Mass: 5.6 kg or less (without option) Dimensions: approx. 308 (W) x 175 (H) x 209 (D) mm
(without protrusion)
approx. 337 (W) x 190 (H) x 307 (D) mm
(with handles, feet, and protectors)
U3751 Web Demonstration
More detailed information on the U3751 spectrum analyzer
and its features is available on the Internet.
Access the URL below to read it.
http://green.advantest.co.jp/techinfo_e/www_e/
demonstration_e/U3751/index.html
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Option 20 High stability frequency reference
Reference frequency stability
Aging: ±2 x 10
-8
/day
±1 x 10
-7
/year
Warm-up drift (nominal): ±5 x 10
-8
(+25°C, 10 min. after turning the power on)
Temperature drift: ±5 x 10-8(0 to +40°C, with reference to 25°C)
Ordering information
Main unit
Spectrum analyzer: U3751
Accessories
Power cable: A01412 Input cable: A01037-0300 N-BNC adapter: JUG-201A/U Ferrite core: ESD-SR-120
Option
High-stability frequency reference crystal: OPT.20 Tracking generator: OPT.74
Accessories (optional)
Battery pack: A870008 Charger: A870009 75impedance converter: ZT-130NC DC power cable: A114020 Carrying case: A129001 Transit case: A129002
Please be sure to read the product manual thoroughly before using the products. Specifications may change without notification.
IF OUT
DC INPUT
Battery receptacle
Main function keys
Operation-key block
GPIB
EXT TRIG INPUT USB
USBPOWER CAL OUT
Soft-key block
TG OUT RF INPUT
Control keys
VIDEO OUT
EXT REF INPUT LAN
6.5-inch color liquid crystal display (LCD)
Exclusive function keysExtension-key block
Front Panel
Rear Panel
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