Advantest U3771/U3772 portable microwave millimeter wave spectrum analyzer

Advantest U3771/U3772 portable microwave millimeter wave spectrum analyzer

Product positioning and core basic characteristics

1. Overall form and power supply

The volumetric weight is only half that of similar traditional spectrometers, and it is designed for on-site maintenance and field surveys;

Three way power supply: battery pack, DC, AC; removable battery can be fully charged for 5.5 hours and can work continuously for up to 2 hours;

Fast preheating: It only takes 5 minutes to achieve the amplitude measurement accuracy index, greatly reducing preheating waiting time;

Interface: Standard USB, supports PNG/BMP image storage, BIN/XML configuration file reading and writing; Standard 10/100BASE-T LAN port supports remote control; Simultaneously equipped with GPIB, VGA video output and other interfaces.

2. Fundamentals of Frequency Hardware

U3771：10 MHz‑31.8 GHz； U3772：10 MHz‑43 GHz；

Dual RF input channels (standard):

RF INPUT1：9 kHz‑8 GHz；

RF INPUT2：10 MHz‑31.8 GHz(U3771)/43 GHz(U3772)；

Dual channel can independently set parameters, display two frequency spectra in upper and lower split screens, and support dual channel display in single scanning mode.

High receiving sensitivity: RF2 typical -117   dBm@34  GHz； Support continuous broadband scanning from 10 MHz to full range, convenient for broadband signal and harmonic testing;

Detector: In addition to ordinary sampling detection, it has a built-in RMS effective value detector, combined with digital intermediate frequency and software calibration, to improve the stability of broadband modulation signal power measurement.

Built in standard features

Image suppression (IS) function software pre selector technology, distinguishing between real signals and image fake signals, enabled by default at the factory; It is recommended to turn off this function when conducting deep analysis and high-speed measurement of modulation signals. The manual provides a comparison screenshot of switch on/off.

Zoom and Time Domain Analysis Mode

F-T frequency time mode: Observe pulse RF signals while displaying frequency domain pulse envelopes and time domain waveforms;

Frequency scaling mode and T-T time-domain extension mode are suitable for observing pulse radar and frequency hopping signals.

The marking counter (frequency meter) directly measures the signal frequency at the marking point, up to the upper limit frequency of the whole machine, with a resolution of 1   Hz-1   kHz optional, used for rapid confirmation of millimeter wave modulation frequency.

Measure and calculate the bandwidth occupied by OBW, which accounts for 10% -99.8% of the total power, and output the OBW and center frequency Fc.

Harmonic measurement input fundamental frequency or marker pointing fundamental frequency, can measure up to 10 orders of harmonic stray, suitable for wireless device stray testing.

Other measurement functions: channel power, total power, average power, stray measurement, adjacent channel leakage power, spectrum transmission template, noise Hz conversion, XdB reduction, intermodulation, etc;

Marking function: up to 10 multi marks, Delta difference mark, peak search; The detector includes multiple modes such as Normal, positive and negative peak values, sampling, and RMS.

LAN remote monitoring is controlled remotely through LAN computers and is suitable for unmanned wireless base stations to remotely collect observation signals.

Cable fault location (requires tracking source options+PC sample software): Single ended measurement of the distance between the open/short circuit fault points of coaxial cables.

Microwave oscillator/module phase noise evaluation (PC sample software), can set carrier offset, output phase noise curve, and also calculate RMS jitter from power spectrum.

Detailed explanation of optional options

Option Number Name Function Description

OPT.10 dual channel input (50 Ω) increases RF INPUT2 (9kHz-3GHz); RF1 frequency band change after installation; Channel crosstalk<-90dBc; Supports dual channel synchronous scanning and triggering, capable of timing measurement, EMC high and low frequency synchronous testing, and simultaneous monitoring of amplifier input and output

OPT.20 high stable frequency reference source aging rate: ± 2 × 10 ⁻⁸/day, ± 1 × 10 ⁻⁷/year; Improve frequency counting accuracy, improve temperature drift and startup drift, and compare with standard oscillator aging ± 2 × 10 ⁻⁶

OPT.28 EMC filter increases CISPR EMI measurement bandwidth: 200Hz, 9kHz, 120kHz, 1MHz; Provide QP peak detection that meets noise measurement standards above 1GHz for electromagnetic compatibility radiation interference testing

OPT.53 (single channel)/54 (dual channel) time-domain analysis measurement bandwidth CBW up to 3MHz; I/Q vector waveform recording; Support frequency time, phase time, power time, FFT analysis; Suitable for FSK, TPMS, and keyless entry signal analysis; Dual channel version with simultaneous time-domain analysis of two channels

OPT.55 (single channel)/56 (dual channel) broadband time-domain analysis with a maximum measurement bandwidth of 40MHz; The highest I/Q sampling rate is 65MHz, with 8M sampling points, suitable for radar pulse signal analysis

OPT.76 Tracking Source 3GHz Output 100kHz-3GHz; Output level 0-60dBm; Normalize cable loss and filter characteristics; The frequency offset mode can measure the frequency conversion loss of the mixer; Paired with SWR bridge to measure antenna/filter return loss and standing wave VSWR

OPT.77 Tracking Source 6GHz Output 100kHz-6GHz; Output level 0-30dBm; Function is the same as OPT.76, choose one of the two

Attention: OPT.10 installation will modify the original frequency range of RF1; OPT76/77 can only be configured as either option.

Summary of Key Technical Specifications

Frequency: Residual FM ＜ 60   Hz × Np-p/100ms; Resolution bandwidth 100Hz-3MHz; Video bandwidth 10Hz-3MHz;

Scanning: Spectrum mode scanning time is 20ms-1000s; Zero span 50 μ s-1000s; Support continuous, single, and gated scanning; Trigger source: free running, video, external IF；

Amplitude: RF1 maximum safe input+30dBm; RF2 maximum+10dBm; Reference level -140~+40dBm; The measurement accuracy of amplitude in different frequency bands varies from ± 0.8 to ± 4.5dB;

Dynamic range: Provide the formula for displaying the average noise level under different frequency bands and pre amplifier on/off conditions; 1dB compression point, second/third order intermodulation, image suppression and other spurious indicators;

Interface connector: RF1 N-type female head; RF2 K-type female head; CAL OUT BNC； GPIB, USB1.1, LAN RJ45, VGA video output; The battery adopts AntonBauer QR interface; External DC input XLR-4;

Environmental conditions: working temperature 0~+50 ℃, humidity ≤ 85% RH, no condensation; Storage -20~+60 ℃;

Physical dimensions: Approximately 308 × 175 × 209   mm excluding protrusions; overall weight<6   kg.

Supporting software, accessories, and ordering information

Free sample software: Download from the official website, including EMI measurement and radio monitoring software, and also provide instrument control modules with source code for secondary development;

Standard accessories: CD version operation manual, power cord, input cable, various RF adapters, magnetic ring; Printed manuals, shipping boxes, rack kits, and 75 Ω impedance converters are optional accessories; There are also multiple high pass filters used for stray measurement;

Host models: U3771 (31.8GHz), U3772 (43GHz); Optional OPT series options can be selected as needed.

Typical application scenarios

On site inspection and maintenance survey of mobile communication and microwave millimeter wave communication systems;

EMI/EMC pre compatibility testing (with OPT.28);

Radar, FSK wireless signal, TPMS tire pressure signal analysis (time-domain option OPT.53-56);

Filter, mixer, antenna device testing (tracking source OPT76/77);

Coaxial cable fault location;

Unmanned base station remote signal monitoring;

Phase noise performance evaluation of oscillators and RF modules.