ADVANTEST U3751 Service Manual

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

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High throughput, twice as fast as our conventional models

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High accuracy: ±0.8 dB between 10 MHz and 3.1 GHz

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Standard configuration includes:

10 MHz to 8 GHz pre-amplifier

Two-channel USB interface

LAN port

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

2

U3751-1E Jan. ’05

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