The Anritsu S331P Site Master is an ultraportable, one-port cable and antenna analyzer engineered for field installation, maintenance, and troubleshooting of wireless communication systems. Available in 4 GHz and 6 GHz models, this instrument delivers the smallest footprint, lowest weight, and fastest measurement speed in the Site Master portfolio. The device operates entirely via USB connection to a Windows tablet or PC—no internal battery required—making it ideal for technicians requiring maximum mobility without sacrificing measurement capability.
## Technical Specifications
**Frequency Range**
• 150 kHz to 4 GHz (S331P-0704)
• 150 kHz to 6 GHz (S331P-0706)
• Frequency accuracy: ±2.5 ppm @ 23 °C ± 3 °C
• Frequency resolution: 1 kHz
**Measurement Performance**
• Output power: –5 dBm (typical)
• Interference immunity: 17 dBm (typical)
• Measurement speed: ≤500 μs/data point (typical)
**Physical & Environmental**
• Dimensions: 52 mm × 148 mm × 36 mm
• Weight: <0.4 kg (typical)
• Impact, dust, and splash-resistant housing
• Operating temperature: 23 °C ± 5 °C
• MIL-PRF-28800F Class 2 compliance
## Key Features
**Measurement Capabilities**
• VSWR and return loss
• Cable loss (one-port)
• Distance-to-fault (DTF) return loss and VSWR
• Smith chart (50 Ω/75 Ω) and 1-port phase (Advanced Mode)
**Calibration & Control**
• FlexCal™ technology enables single calibration across all frequencies
• Factory-default 1-port ReadyCal automatically applied
• Standard OSL calibration supported
• Classic and Advanced modes with configurable shortcuts
• Type N(m), 50 Ω test port connector
**Software Ecosystem**
• Line Sweep Tools (LST) for sweep management and PDF/HTML reporting
• easyTest™ Tools for work instruction automation
• SkyBridge Tools™ cloud-based trace management
• EZ Name Quick Matrix for rapid file naming
• HHST (Handheld Software Tools) compatible
## Compatibility & Integration
• Windows 7, 8, 8.1, 10, 11 (32 or 64-bit)
• USB 2.0 control and power delivery
• Supplied USB-A to Micro-B latch cable (1.8 m)
• Includes soft carrying case and torque multiplier
