The Bird 4421 (often searched or miskeyed as IRD 4421) is a high-precision RF power meter designed for semiconductor processing and telecommunications applications. Highly regarded for its laboratory-grade accuracy, the 4421 operates with Bird's 4020 series power sensors to measure RF power, VSWR, and return loss in demanding environments.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Optional GPIB (IEEE-488) or RS-232 |
| Display | 4-1/2 digit LCD with backlight |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 115 / 230 VAC (±10%), 50/60 Hz, or 8 C-cell NiCd rechargeable batteries |
| Operating Temperature | 0 to 50 °C |
| Dimensions (W×H×D) | 312 x 108 x 310 mm |
| Weight | 5 kg |
| Rack Mount Option | Single or dual 19" rack mounting kits available |
RF Performance Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 100 kHz to 1 GHz (sensor dependent) |
| Power Measurement Range | 300 mW to 10 kW (sensor dependent) |
Measurement Accuracy & Resolution
| Parameter | Value |
|---|---|
| Power Measurement Accuracy | ±3% of reading (with 4020 series sensors) |
| VSWR Range | 1.0 to 199.9 |
| Return Loss Range | 0.0 to 40.0 dB |
Measurement Modes & Functions
| Parameter | Value |
|---|---|
| Measurement Modes | Forward Power (Watts or dBm), Reflected Power (Watts or dBm), VSWR, Return Loss (dB) |
Sensor Compatibility & Control
| Parameter | Value |
|---|---|
| Compatible Sensors | Bird 4020 Series directional power sensors (e.g. 4021, 4022, 4024, 4025, 4027, 4028) |
Display & User Interface
| Parameter | Value |
|---|---|
| Display Units | W, dBm, SWR, dB |
Environmental & Compliance
| Parameter | Value |
|---|---|
| Storage Temperature Range | -20 to 70 °C |
| Operating Humidity | 95% maximum (non-condensing) |
Power & Electrical Requirements
| Parameter | Value |
|---|---|
| AC Input Voltage Options | 115 VAC / 230 VAC nominal (rear panel switchable) |
| Battery Operating Time | Up to 8 hours with fully charged NiCd batteries |
Power
| Parameter | Value |
|---|---|
| Power Consumption | 17 VA |
| AC Line Frequency | 50/60 Hz |
| Internal Battery Type | Rechargeable Nickel-Cadmium (Ni-Cad) |
Performance
| Parameter | Value |
|---|---|
| Overrange Indication | 120% of full scale |
| Instrument Accuracy | ±1% of reading (excluding sensor error) |
| Measurement Rate | Approx. 2 readings per second |
Interfaces
| Parameter | Value |
|---|---|
| GPIB (IEEE-488) Interface | Optional (field or factory-installable) |
| RS-232 Interface | Optional (field or factory-installable) |
Technology
Directional RF Power Measurement
Applications
Semiconductor manufacturing, RF transmitter maintenance, antenna system testing