The Keysight (formerly Agilent/HP) N8975A is a high-performance Noise Figure Analyzer designed for fast, accurate, and repeatable noise figure measurements. Covering a frequency range from 10 MHz to 26.5 GHz in a single instrument, it supports simultaneous noise figure and gain characterization of amplifiers and frequency-translating devices. Standard features include an APC 3.5 mm (male) input connector, six user-selectable measurement bandwidths, compatibility with smart SNS Series noise sources, and a dedicated secondary GPIB port for LO control.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB (Primary), Dedicated LO Control (2nd GPIB), RS-232, Parallel, LAN (10Base-T), VGA |
| Measurement Technique | Y-factor |
| Data Storage | Built-in 3.5-inch 1.44 MB floppy disk drive |
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to +55 |
Frequency Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 10 MHz - 26.5 GHz |
| Measurement Bandwidths | 6 user-selectable (100 kHz, 200 kHz, 400 kHz, 1 MHz, 2 MHz, 4 MHz) |
Noise Figure Measurement
| Parameter | Value |
|---|---|
| Measurement Capabilities | Simultaneous noise figure and gain measurements |
| Supported Device Types | Amplifiers and frequency translating devices |
| Noise Figure Instrument Uncertainty | < 0.05 dB (10 MHz to 3 GHz) |
Gain Measurement
| Parameter | Value |
|---|---|
| Gain Instrument Uncertainty | < 0.17 dB (10 MHz to 3 GHz) |
RF Input Characteristics
| Parameter | Value |
|---|---|
| Connector Type | APC 3.5 mm (male) |
| Input Impedance | 50 Ω |
Noise Source Drive
| Parameter | Value |
|---|---|
| Compatible Noise Sources | Keysight / Agilent SNS Series |
| Noise Source Drive Voltage | +28V (pulsed) |
Interfaces and Connectivity
| Parameter | Value |
|---|---|
| LO Control Interface | Dedicated 2nd GPIB |
Performance
| Parameter | Value |
|---|---|
| Noise Figure Measurement Range | 0 to 30 dB |
| Gain Measurement Range | -20 to +40 dB |
| Sweep Points | 2 to 401 points |
| ENR Data Entry | Smart Noise Source (SNS) auto-download, floppy disk, manual entry, remote |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Maximum Safe DC Voltage | 0 Vdc |
Software & Control
| Parameter | Value |
|---|---|
| Markers | 4 per trace |
Technology
Noise Figure Analysis
Applications
RF and Microwave Component Characterization