Advantest U3751 9kHz to 8GHz Spectrum Analyzer

The Advantest U3751 is a portable spectrum analyzer designed for a wide range of signal analysis applications, from production line testing to field maintenance. It covers a frequency range from 9 kHz to 8 GHz, offering a balance of performance, speed, and portability. The instrument is engineered for high throughput, with processing speeds twice as fast as previous models, which contributes to reduced test times and increased cost-efficiency in manufacturing environments. Its design incorporates a digital IF section and advanced circuit technologies to achieve high overall amplitude accuracy, with specifications of ±0.8 dB between 10 MHz and 3.1 GHz, and ±1.0 dB between 3.1 GHz and 8 GHz. The Advantest U3751 is equipped with a standard pre-amplifier for measurements up to 8 GHz, enhancing sensitivity for analyzing faint signals. Key interface capabilities include USB 1.1, LAN, and GPIB, facilitating data transfer and remote operation.

### Technical Specifications

**Frequency Range:**
* **Main Unit:** 9 kHz to 8 GHz
* **Frequency Bands:**
* 9 kHz to 3.1 GHz (Band 0)
* 3.0 GHz to 8 GHz (Band 1)

**Preamplifier:**
* **Availability:** 10 MHz to 8 GHz
* **Functionality:** Built-in standard, boosts signal levels for highly sensitive measurements, particularly for signals at 5 GHz and above.
* **Noise Level (Typical):** -135 dBm at 5 GHz (Pre-Amp ON)

**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
* *Conditions:* 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**Resolution Bandwidth (RBW):** * **Range:** 300 Hz to 3 MHz (1-3 steps) * **RBW Accuracy:** ±12%**Video Bandwidth (VBW):** * **Range:** 10 Hz to 3 MHz (1-3 steps)**Amplitude Accuracy:** * **Overall Amplitude Accuracy:** ±0.8 dB (10 MHz to 3.1 GHz) * **Overall Amplitude Accuracy:** ±1.0 dB (3.1 GHz to 8 GHz) * **Power Measurement Repeatability:** High, guaranteed by digital interface**Amplitude Range:** * **Range:** Noise level to +30 dBm * **Display Range:** 100/50/20/10/5 dB, linear * **Scale Unit:** dBm, dBmV, dBµV, dBµVemf, dBpW, W, V * **Reference Level Setting Range:** -140 to +40 dBm; -31.2 to 148.8 dBµV (with OPT.15 installed)**Input Attenuator:** * **Range:** 0 to 50 dB (10 dB steps)**Detectors:** * **Types:** Normal, Posi, Nega, Sample, RMS * **RMS Detection:** Supported for accurate power measurement of broadband modulation**Measurement Functions:** * **PASS/FAIL Judgment:** Can be set using limit lines * **Harmonics Measurement:** Suitable for high-frequency testing of radio devices * **Channel Setting Function:** Supports calculation and table methods for measuring communication and broadcast channels * **Marker Functions:** Multi-marker (10 markers), delta marker, peak search * **Zoom Functions:** Window and F-F mode for signal analysis, F-T mode, T-T mode available * **ACP (Adjacent Channel Power) Measurement:** Measures ratios between carrier power and adjacent channel power, up to five adjacent channels can be specified * **Spectrum Emission Mask (SEM) Function:** Facilitates measurement of licensed radio waves * **Other Functions:** Channel power, Total power, Average power, OBW, Spurious measurement, Noise-Hz conversion, frequency counter * **Time-domain Analysis:** Possible up to 40 MHz maximum measurement bandwidth * **I/Q Data Download:** To external PC**Throughput:** * **Speed:** Twice as fast as conventional models * **Measurement Time Example:** Reduced from 875 ms to 350 ms (on GPIB)**Calibration:** * **High Speed Calibration:** Requires less time and fewer steps due to circuit integration techniques**Warm-up Time:** * **Duration:** Within 5 minutes**Electrical:** * **AC Power Input:** Automatic switching (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:** +11 V to +17 V * **Power Consumption:** * AC operation: 100 VA or less * DC operation: 70 W or less**Interfaces:** * **Standard Configuration:** * USB 1.1 port * LAN port * GPIB * **Other Outputs:** * IF OUT (21.4 MHz IF signal output) * VIDEO (Output to an external VGA monitor) * CAL OUT * EXT TRIG * EXT REF (Standard signal input for external reference) * PHONE (Earphone jack for demodulated AM/FM audio)**Physical:** * **Mass:** 5.6 kg or less (without option) * **Dimensions (approx.):** * Without protrusion: 308 (W) x 175 (H) x 209 (D) mm * With handles, feet, and protectors: 337 (W) x 190 (H) x 307 (D) mm * **Display:** 6.5-inch color Liquid Crystal Display (LCD)**Operating Environment:** * **Temperature:** 0 to +50°C * **Humidity:** Relative humidity: 85% or less (without condensation)**Storage Environment:** * **Temperature:** -20 to +60°C * **Humidity:** Relative humidity: 85% or less**Power Supply Options:** * **Sources:** Mains (AC), DC, Rechargeable Battery Pack * **Battery Operation:** Up to 2.5 hours typical operation**Software and Options:** * **Saving Screenshots:** BMP and PNG formats to USB memory * **Data Transfer:** Can save measurement data to PC via USB * **Optional Features:** Time-domain analysis, phase noise measurement capabilities, tracking generator, EMC filter * **I/Q Data:** Can be downloaded to external PC### Why Choose Aumictech for Advantest U3751?At Aumictech, we specialize in supplying high-performance spectrum analyzer equipment. Whether you need a reliable Advantest U3751 for demanding RF and microwave signal analysis, require high throughput for efficient production testing, or seek precise measurements with excellent accuracy, our team ensures the Advantest U3751 delivers maximum performance for your application.