Advantest U3700 Series Spectrum Analyzers
2 models with full specifications from Advantest.
The Advantest U3700 Series consists of compact, lightweight spectrum analyzers designed primarily for field use and on-site maintenance. Sharing a uniform physical footprint, these portable instruments weigh 5.6 kg and operate using AC power, DC power, or a dedicated battery pack. This flexibility allows engineers to perform high-quality RF measurements in field environments where standard power is unavailable. The series features two primary models, the Advantest U3751 and the Advantest U3772. While both share standard display configurations, operating temperature limits, and flexible power supplies, they differ significantly in their maximum frequency limits, input connector types, and measurement bandwidth ranges.
- Form Factor
- Portable field-use spectrum analyzer
- Weight
- 5.6 kg
- Frequency Range
- 9 kHz to 8 GHz (U3751) or 43 GHz (U3772)
- Display Size
- 6.5-inch color TFT LCD
- Power Options
- AC (100 V to 240 V), DC (11 V to 17 V), or Battery
Models in this series
Physical Design and Power Configurations
Both models in the U3700 series are built for field-use portability, with identical dimensions of 308 mm × 175 mm × 209 mm and a weight of 5.6 kg. For field work, they operate on a 11 V to 17 V DC supply or a battery pack, while standard AC operation (100 V to 240 V, 50 Hz/60 Hz) is available for benchtop or production applications.
The operating temperature range is 0 °C to +50 °C for both instruments. However, the Advantest U3772 operating limit changes to 0 °C to +40 °C when utilizing battery power. Each model is equipped with a 6.5-inch color TFT LCD screen offering a resolution of 640 × 480 pixels.
Key Differences Between U3751 and U3772
The primary distinctions between the two models lie in their maximum frequency limits, connection interfaces, and measurement bandwidth ranges:
- Advantest U3751: Operates from 9 kHz to 8 GHz. It has a standard resolution bandwidth (RBW) range of 100 Hz to 1 MHz (expandable to 30 Hz with Opt 70) and a standard video bandwidth (VBW) of 10 Hz to 1 MHz. The RF input uses an N (female) connector.
- Advantest U3772: Designed for microwave applications, covering a broad frequency range from 9 kHz to 43 GHz. It features a 2.4 mm (female) RF input connector, a resolution bandwidth (RBW) range of 100 Hz to 3 MHz, and a video bandwidth (VBW) range of 10 Hz to 3 MHz.
Frequency Stability and Configuration Options
The Advantest U3751 offers a short 5-minute warm-up time and features an aging rate of ±2 × 10^-6 / year. This frequency reference accuracy can be upgraded to ±1 × 10^-7 / year with the optional high-stability reference source (Opt 20).
The Advantest U3772 features a standard reference frequency aging rate of ±2.0 ppm/year. Like the U3751, it supports an optional high-stability frequency reference (Opt 20) and additionally supports an optional EMC filter (Opt 28) for specialized EMI testing. The U3772 also supports USB Flash Memory for external storage.
Frequently asked questions
- What standard interfaces are available on the Advantest U3751?
- The Advantest U3751 is standardly equipped with LAN, USB (Type A and Type B), and VGA output interfaces. A GPIB interface is available as an option.
- Are the resolution bandwidth ranges of the U3751 and U3772 identical?
- No. The Advantest U3751 has a standard RBW range of 100 Hz to 1 MHz, which can be extended down to 30 Hz with Option 70. The Advantest U3772 has a standard RBW range of 100 Hz to 3 MHz.
- What is the input impedance and connector type for each model?
- Both models have a standard RF input impedance of 50 Ω. However, the Advantest U3751 is equipped with an N (female) connector, whereas the microwave-capable Advantest U3772 is equipped with a 2.4 mm (female) connector.