The Anritsu S251B Site Master is a high-performance, handheld, 2-port cable and antenna analyzer designed specifically for installing, commissioning, and troubleshooting wireless communication transmission systems. Covering the 625 MHz to 2500 MHz frequency band, it supports return loss, VSWR, cable loss, distance-to-fault (DTF), and transmission measurements.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | RS-232 (9-pin D-sub) |
| Display | Monochrome graphical LCD with backlighting |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 12 to 15 VDC, internal rechargeable NiMH battery, or external AC/DC adapter |
| Operating Temperature | 0 to 50 °C |
| Dimensions (W×H×D) | 254 mm × 178 mm × 61 mm |
| Weight | 1.8 kg (4.0 lbs) |
RF and Frequency Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 625 MHz to 2500 MHz |
| Frequency Resolution | 10 kHz |
| Frequency Accuracy | ±75 ppm |
| Output Power Range | 0 dBm or -10 dBm (nominal) |
Measurement Performance
| Parameter | Value |
|---|---|
| Transmission Dynamic Range | 625 MHz to 2000 MHz: > 80 dB; 2000 MHz to 2500 MHz: > 75 dB |
| Directivity | > 42 dB (after 1-port calibration) |
| Source Match | > 30 dB (after 1-port calibration) |
| Measurement Speed | 4.5 ms per data point (typical) |
Cable and Antenna (CAT) Measurements
| Parameter | Value |
|---|---|
| Return Loss Range | 0 to 60 dB |
| Return Loss Resolution | 0.01 dB |
| VSWR Range | 1.00 to 65.00 |
| VSWR Resolution | 0.01 |
| Cable Loss Range | 0 to 30 dB |
| Cable Loss Resolution | 0.01 dB |
Distance-to-Fault (DTF) and TDR Specifications
| Parameter | Value |
|---|---|
| Maximum Distance Range | Up to 1000 m (3281 ft) |
| Propagation Velocity (Vp) Range | 0.20 to 1.00 |
Test Port and System Interfaces
| Parameter | Value |
|---|---|
| RF Port Connector Type | Type N, female (Port 1 and Port 2) |
| RF Port Impedance | 50 Ω |
| RF Port Damage Level | +22 dBm, ±50 VDC |
Display and User Interface
| Parameter | Value |
|---|---|
| On-Screen Markers | 4 markers |
| Limit Lines Configuration | Single limit and multi-segment limits |
Data Storage and Software
| Parameter | Value |
|---|---|
| Internal Trace Storage Capacity | Up to 200 non-volatile trace memories |
| PC Analysis Software Compatibility | Anritsu Handheld Software Tools |
Power and Battery Management
| Parameter | Value |
|---|---|
| Battery Operating Time | 2.0 to 2.5 hours typical |
| Battery Type | Rechargeable NiMH |
| External AC Power Adapter Input | 100 to 240 VAC, 50 to 60 Hz |
| DC Input Range | 12 to 15 VDC, 1 A max |
Physical and Environmental Characteristics
| Parameter | Value |
|---|---|
| Storage Temperature Range | -20 to 75 °C |
| Relative Humidity Range | Up to 95% non-condensing |
Calibration and Standards Compliance
| Parameter | Value |
|---|---|
| Supported Calibration Types | 1-Port (OSL), Transmission (Gain/Loss) Calibration |
Performance
| Parameter | Value |
|---|---|
| Number of Data Points | 130, 259, 517 |
| Interfering Signal Immunity | +15 dBm (on-channel), +22 dBm (off-channel) |
| Transmission Dynamic Range (625 MHz to 2000 MHz) | > 80 dB |
| Transmission Dynamic Range (2000 MHz to 2500 MHz) | > 75 dB |
| Directivity (Corrected) | >= 42 dB |
| Source Match (Corrected) | >= 30 dB |
Environmental
| Parameter | Value |
|---|---|
| Environmental Shock Resistance | MIL-T-28800E, Class 5 |
| Operating Altitude | Up to 4,572 m (15,000 ft.) |
| Non-operating Altitude | Up to 15,240 m (50,000 ft.) |
Options
| Parameter | Value |
|---|---|
| Optional Power Monitor Frequency Range (Option 5) | 10 MHz to 3000 MHz |
| Optional Power Monitor Measurement Range (Option 5) | -50 dBm to +20 dBm |
Power Monitor (Option 5)
| Parameter | Value |
|---|---|
| Power Monitor Offset Range (Option 5) | -99.9 to +99.9 dB |
| Power Monitor Resolution (Option 5) | 0.1 dB, 0.1 W |
| Power Monitor Units (Option 5) | dBm, W, mW, µW, nW |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Port 1 Connector Type | Type N, female, 50 Ω |
| Port 2 Connector Type | Type N, female, 50 Ω |
Regulatory & Compliance
| Parameter | Value |
|---|---|
| EMC Compliance | Conforms to European Community Council Directive 89/336/EEC, EN 55011 Class A, EN 50082-1 |
| Safety Compliance | Conforms to European Council Directive 73/23/EEC, EN 61010-1 |
Technology
Vector Network Analysis
Applications
Cellular and Wireless Base Station Transmission Testing