The HP/Agilent 8971C Noise Figure Test Set extends noise figure measurement capabilities to microwave frequencies, operating as a downconverter from 10 MHz to 26.5 GHz. Designed exclusively for use with the HP/Agilent 8970B Noise Figure Meter, this instrument enables single-sideband measurements with a single calibration and sweep cycle. The integrated low-noise preamplifier reduces measurement uncertainty by minimizing second-stage noise figure effects, making it essential for characterizing amplifiers, converters, and RF components in communication and radar systems.
## Technical Specifications
**Frequency Range:** 10 MHz to 26.5 GHz
**Gain:** 23 dB to 27 dB across 10 MHz to 26 GHz
**Noise Figure (Maximum):**
• 10–30 MHz: 18 dB
• 30–100 MHz: 13 dB
• 0.1–12 GHz: 10 dB
• 12–18 GHz: 11.5 dB
• 18–26.5 GHz: 14.5 dB
**Input VSWR/Return Loss:**
• 10 MHz to 18 GHz: 2.25
• 18 GHz to 26.5 GHz: 2.7
**Maximum Operating RF Noise Input Power:**
• 10–1600 MHz: −29 dBm
• 1.6–26.5 GHz: −26 dBm
**Maximum Safe RF Input Power:** −5 dBm
**LO Input Power Requirements:**
• Standard: +7 dBm to +20 dBm
• With Option 001: +1 dBm to +7 dBm
**Noise Source Drive:** 28.0 ±0.1 V (ON); <1 V (OFF)
## Key Features
• Simultaneous gain and noise figure measurements for amplifier characterization
• Broadband single-sideband (SSB) and double-sideband (DSB) measurement support
• Double down-conversion measurements via 8970B integration
• Tuner insertion loss compensation for transistor characterization
• RF Input/LO Input connectors: 3.5 mm (female); IF Output connector: N (female)
## Options
**Option 001:** Internal LO power amplifier reducing required LO input to +1 dBm; recommended for measurements above 20 GHz or high LO path loss.
**Option 002:** Removes built-in RF preamplifier for high-gain device measurement or user-supplied low-noise preamplifier integration.
**Options 907, 908, 909:** Front panel handle and/or rack mounting flange kits.
## Compatibility
Exclusive compatibility with HP/Agilent 8970B Noise Figure Meter. Not compatible with NFA series instruments.
