The Rohde & Schwarz NAS is a high-precision directional power meter designed for measuring transmitter power, reflected power, and Standing Wave Ratio (SWR) of transmitter systems. Equipped with special insertion units, it is highly suited for testing analog and digital mobile radio equipment, including GSM networks, and supports peak envelope power (PEP) and average power (AVG) measurements.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | RS-232-C (optional via NAS-B1 interface option) |
| Display | Two-line LC display with digital readouts (3.5-digit and 3-digit) and dual analog bar graphs |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 6 × 1.5 V AA dry cells, rechargeable NiCd battery pack, or external AC mains adapter |
| Operating Temperature | 0 to +50 °C |
| Dimensions (W×H×D) | 156 mm × 86 mm × 205 mm |
| Weight | 1.2 kg |
Measurement Capabilities
| Parameter | Value |
|---|---|
| Frequency Range | 1 MHz to 2000 MHz (insertion unit dependent) |
| Power Measurement Range | 10 mW to 1200 W |
| SWR Measurement Range | 1.00 to 99.9 |
| Return Loss Measurement Range | 0 to 40 dB |
| Measurement Parameters | Forward power, reflected power, standing wave ratio (SWR), reflection coefficient, return loss |
| Impedance | 50 Ω (determined by connected insertion unit) |
User Interface and Display
| Parameter | Value |
|---|---|
| Display Resolution (Return Loss) | 0.1 dB |
| Display Measurement Units | W, dBm, dB, SWR |
Measurement Accuracy and Calibration
| Parameter | Value |
|---|---|
| Selftest | Integrated automatic self-test routine during power-on |
| Autoranging | Automatic measurement range selection |
System Connectivity and Interfaces
| Parameter | Value |
|---|---|
| Optional Interface Option | RS-232-C Interface (Option NAS-B1) |
Physical and Power Specifications
| Parameter | Value |
|---|---|
| Battery Operating Time (Alkaline) | Approx. 70 hours |
| Battery Operating Time (NiCd) | Approx. 18 hours |
| Power Saving Function | Automatic switch-off function to conserve battery power |
Sensor Compatibility and Connection
| Parameter | Value |
|---|---|
| Compatible Insertion Unit NAS-Z1 Frequency Range | 1 MHz to 30 MHz |
| Compatible Insertion Unit NAS-Z1 Power Range | Up to 1200 W |
| Compatible Insertion Unit NAS-Z2 Frequency Range | 30 MHz to 120 MHz |
| Compatible Insertion Unit NAS-Z2 Power Range | Up to 120 W |
| Compatible Insertion Unit NAS-Z3 Frequency Range | 70 MHz to 1000 MHz |
| Compatible Insertion Unit NAS-Z3 Power Range | Up to 120 W |
| Compatible Insertion Unit NAS-Z5 Frequency Range | 70 MHz to 1000 MHz |
| Compatible Insertion Unit NAS-Z5 Power Range | Up to 1200 W |
| Compatible Insertion Unit NAS-Z7 Frequency Range | 800 MHz to 2000 MHz |
| Compatible Insertion Unit NAS-Z7 Power Range | Up to 100 W |
| Compatible Insertion Unit NAS-Z21 Standard | GSM 900 applications |
| Compatible Insertion Unit NAS-Z22 Standard | GSM 1800 (DCS 1800) and GSM 1900 (PCS 1900) applications |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to +70 °C |
Power & Battery
| Parameter | Value |
|---|---|
| Battery Type | 6 x 1.5 V AA (LR6) dry cells or 6 x 1.2 V NiCd accumulators |
| Auto-Off Delay | 2.5 min / 10 min / continuous (selectable) |
| Current Consumption (without backlighting) | approx. 40 mA |
| Current Consumption (with backlighting) | approx. 120 mA |
| External Power Supply Input | 7 V to 15 V DC |
| NiCd Battery Charger | Integrated, active when external power supply is connected |
Options
| Parameter | Value |
|---|---|
| IEC/IEEE-488 Bus Interface Option | NAS-B2 |
| RS-232 Interface Option | NAS-B4 |
Compatible Insertion Units
| Parameter | Value |
|---|---|
| Compatible Insertion Unit NAS-Z12 Frequency Range | 100 MHz to 2000 MHz |
| Compatible Insertion Unit NAS-Z12 Power Range | 0.1 W to 120 W |
| Insertion Unit NAS-Z1 Insertion Loss | < 0.05 dB |
| Insertion Unit NAS-Z1 SWR | < 1.05 |
| Insertion Unit NAS-Z1 Directivity | ≥ 35 dB |
| Insertion Unit NAS-Z2 Insertion Loss | < 0.1 dB |
| Insertion Unit NAS-Z2 SWR | < 1.06 (up to 500 MHz), < 1.12 (500 to 1000 MHz) |
| Insertion Unit NAS-Z2 Directivity | ≥ 30 dB (30 to 500 MHz), ≥ 26 dB (500 to 1000 MHz) |
Display
| Parameter | Value |
|---|---|
| Digital Display Refresh Rate | 3 measurements/s |
| Analog Display Bargraph | 31-segment scale |
Measurement Performance
| Parameter | Value |
|---|---|
| Meter Intrinsic Error | ±0.5% of reading ± 1 digit |
Technology
RF Power Measurement
Applications
RF Transmitter Testing and Mobile Radio SWR/Power Diagnostics