The Anritsu S251B is a broadband, two-port Site Master cable and antenna analyzer designed for field technicians and engineers. It offers comprehensive measurement capabilities for the installation, maintenance, and troubleshooting of wireless communication systems, operating within the cellular, PCS/GSM, and ISM bands. Its robust design and advanced features provide accurate and reliable data essential for ensuring optimal performance of antenna and cable systems. The Anritsu S251B is characterized by its high immunity to RF interference, enabling precise measurements even in active RF environments. Its high dynamic range facilitates antenna-to-antenna isolation measurements, while selectable output levels and an optional bias tee support Tower Mounted Amplifier (TMA) gain verification. The instrument is supported by Anritsu’s Site Master Software Tools, compatible with Windows 95, 98, and NT, allowing for trace and cable parameter downloads via an RS-232 serial port.
### Technical Specifications
* **Measurement Capabilities:**
* Return Loss / VSWR: Range 0 to 54 dB, Resolution 0.01 dB
* Cable Loss: Range 0 to 54 dB, Resolution 0.01 dB
* Insertion Loss / Gain: Range -120 to 100 dB, Resolution 0.1 dB
* Distance-to-Fault (DTF): With vertical range for return loss (0 to 54 dB) and SWR (1 to 65), and horizontal range dependent on data points and resolution
* Antenna-to-Antenna Isolation: Achieved through high dynamic range (>80 dB)
* Tower Mounted Amplifier (TMA) Gain Verification: Supported by selectable output levels and optional built-in Bias Tee
* **RF Source:**
* Frequency Range: 625 to 2500 MHz
* Frequency Resolution: 10 kHz
* Power Output (Nominal): Selectable -30 dBm or +6 dBm
* **Performance:**
* Frequency Accuracy (CW mode): 75 ppm
* Display Resolution: 130, 259, or 517 data points
* Sweep Rate (typical, with calibration): 25 ms/data point or 40 ms/point
* Interference Immunity: Up to +10 dBm (RF out), +30 dBc (RF in)
* **Instrument Configuration and Memory:**
* User Configurations (including calibrations): 10
* Custom Cable Configurations: 50
* Trace Memory: Up to 200 measurement traces with date/time stamp and alphanumeric labeling
* Software Tools Compatibility: Operates with Windows 95, 98, NT
* **Optional Features:**
* Built-in Bias Tee (Option 10A): Provides +15 VDC with 270 mA peak (25 ms) and 240 mA steady state current capability
* RF Power Monitor (Option 5): Wattmeter function with display range of -80 to +80 dBm
### Electrical Specifications
* **Bias Tee (Option 10A):**
* Output Voltage: +15 VDC
* Peak Current: 270 mA (25 ms)
* Steady State Current: 240 mA
* **RF Power Detector (Option 5):**
* Display Range: -80 to +80 dBm
* Power Range: 10 pW to 100 kW
* Detector Range: -45 to +20 dBm, 32 nW to 100 mW
* Offset Range: 0 to +60 dB
### Interfaces
* **Serial Port:** RS-232, 9-pin D-sub connector, three-wire serial
* Communication Parameters: 9600 baud, no parity, 8 data bits, 1 stop bit (N-8-1)
### Physical Characteristics
* **Dimensions:** 25.4 x 17.8 x 6.10 cm (10 x 7 x 2.4 inches)
* **Weight:** 1.81 kg (4.0 lbs)
* **Test Port Connector:** Precision N female
* **Maximum Input without Damage:**
* N(f) test port: +22 dBm
* RF power detector: +20 dBm, 50 Ω
* **Environmental:**
* Operating Temperature: 0 to 50°C
* Storage Temperature: -20 to 75°C
### Compatibility
* **Software:** Site Master Software Tools operate with Windows 95, Windows 98, and Windows NT
* **Printers:** Compatible with Epson, Canon, Citizen, and HP printer drivers
### Documentation
* **User’s Guide:** Available
* **Programming Manual:** Available
* **Maintenance Manual:** Available
Why Choose Aumictech for Anritsu S251B?
At Aumictech, we specialize in supplying high-end cable and antenna analyzer equipment. Whether you need accurate VSWR and return loss measurements, reliable cable loss and distance-to-fault analysis, or efficient troubleshooting of wireless communication systems, our team ensures the Anritsu S251B delivers maximum performance for your application.
