The NI USB-5681 RF Power Meter is a true RMS power meter engineered for high-accuracy RF power measurements across 10 MHz to 18 GHz. Its dual-path architecture delivers true RMS performance across the entire 60 dB dynamic range, from -40 dBm to +20 dBm. The device measures power in two configurable ranges: +20 dBm to -7 dBm and -7 dBm to -40 dBm, with 0.01 dB measurement resolution.
Technical Specifications
• Frequency Range: 10 MHz to 18 GHz
• Power Measurement Range: -40 dBm to +20 dBm
• Dynamic Range: 60 dB
• Measurement Resolution: 0.01 dB
• Signal-Channel Bandwidth: 50 kHz
• Sample Rate: 140 kS/s typical
• Aperture Time: Configurable 0.01 ms to 300 ms in 0.01 ms steps
• RF Connector: Type-N male, 50 Ω (SMA adapter included)
• Input Voltage: 5 VDC from USB host
• Input Current: 450 mA (operation)
• Dimensions: 25 mm × 45 mm × 110 mm
• Weight: 230 g
• Operating Temperature: 0 °C to 50 °C
• Storage Temperature: -40 °C to +71 °C
• RF Port Protection: ±20 VDC maximum, +30 dBm absolute power
– Key Features
• True RMS measurement capability across full frequency and dynamic range
• Dual-range architecture for optimized accuracy across signal levels
• Multiple measurement modes: Time Slot, Scope, and Continuous acquisition
• Configurable duty cycle correction for pulse-modulated signal analysis
• Internal, external, and software triggering with trigger delay configuration
• Auto-averaging and repeat averaging methods
• Onboard calibration factors eliminate need for external reference standards
• Programmatic sensor zeroing (approximately 20 seconds)
• Compact USB-powered design with integrated connectivity
– Typical Applications
• RF amplifier characterization and validation
• Transceiver performance testing
• RF component measurements and compliance verification
• Automated test integration via NI software
– Compatibility & Integration
Connects via USB to host systems. Integrates with NI software environments for automated test and measurement workflows.
