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Keysight N8976B

Keysight N8976B
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Service Guide
Keysight NFA Series
Noise Figure Analyzers
This manual provides documentation for the following analyzers:
N8973B (10 MHz – 3.6 GHz)
N8974B (10 MHz – 7 GHz)
N8975B (10 MHz – 26.5 GHz)
N8976B (10 MHz – 40 GHz)
Notice: This document contains references to Agilent.
Please note that Agilent’s Test and Measurement
business has become Keysight Technologies. For
more information, go to www.keysight.com.

Table of Contents

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Keysight N8976B Specifications

General IconGeneral
Frequency Range10 MHz to 26.5 GHz
Input Impedance50 Ω
InterfacesLAN, USB, GPIB
Resolution Bandwidth (RBW)1 Hz to 3 MHz in 1-3-10 sequence
DetectorsPeak, Average
Noise Figure Range0 dB to 30 dB
Dimensions177 mm (H) x 426 mm (W) x 470 mm (D)

Summary

4. RF Section Troubleshooting (N8973 B, 74 B, 75 B Analyzers)

Troubleshooting

Provides procedures for isolating hardware problems by verifying RF section assembly functionality.

5. RF Section Troubleshooting (N8976 B)

RF Section Description

Describes the RF section for the N8976B model, including its four front-end signal paths.

6. Front End Control Troubleshooting

A15 Front End Control Description

Describes the functionality and purpose of the A15 Front End Controller board.

A15 Front End Control Assembly Troubleshooting

Provides troubleshooting procedures for the A15 Front End Control Assembly.

8. L.O. SynthesizerReference Troubleshooting

A14 L.O. Synthesizer Assembly Description

Describes the L.O. Synthesizer assembly, its inputs, outputs, and tuning range.

A14 L.O. Synthesizer Troubleshooting

Provides troubleshooting procedures for the L.O. Synthesizer assembly.

A16 Reference Assembly Description

Describes the A16 Reference Assembly, its purpose, and signal sources.

A16 Reference Assembly Troubleshooting

Provides troubleshooting procedures for the A16 Reference Assembly, including diagnostic LEDs.

9. CPUDisk Drive Troubleshooting

A4 Processor Description

Describes the A4 Processor assembly, its components, and rear panel connectivity.

A4 Processor Assembly Troubleshooting

Details troubleshooting steps for the A4 Processor assembly, including boot-up issues and BIOS settings.

A5 Disk Drive Description

Describes the A5 Disk Drive, its partitioning, and the Instrument Image Recovery System.

A5 Disk Drive Troubleshooting

Provides troubleshooting steps for software-related issues concerning the A5 Disk Drive.

10. Power SupplyMidplane Troubleshooting

A6 Power Supply Basic Troubleshooting (Cover On)

Outlines basic troubleshooting steps for the A6 Power Supply with the cover on.

A7 Midplane Assembly Troubleshooting

Provides troubleshooting steps for the A7 Midplane Assembly, including power supply verification.

11. Front PanelMotherboard Troubleshooting

15. Assembly Replacement Procedures

RF Front End Assembly (N8973 B, 74 B, 75 B)

Provides removal and replacement steps for the RF Front End Assembly for specific models.

RF Front End Assembly (N8976 B)

Details the removal and replacement procedures for the RF Front End Assembly for the N8976B model.

Front End Control Assembly

Outlines the removal and replacement steps for the Front End Control Assembly.

L.O. Synthesizer Assembly

Provides procedures for removing and replacing the L.O. Synthesizer assembly.

Reference Assembly

Outlines the removal and replacement procedures for the Reference Assembly.

Power Supply Assembly

Provides steps for removing and replacing the Power Supply assembly.

CPU Assembly

Details the removal and replacement procedures for the CPU assembly.

A5 Solid State Drive

Outlines the removal and replacement steps for the SSD or memory card.

Analog I.F. (AIF)Digital I.F. (DIF) Assembly

Details the removal and replacement steps for the Analog/Digital IF assemblies.

Midplane Assembly

Provides removal and replacement steps for the Midplane Assembly.

Motherboard Assembly

Details the removal and replacement procedures for the Motherboard Assembly.

Front Frame Assembly

Details the removal and replacement steps for the Front Frame Assembly.

16. Post-Repair Procedures

Post-Repair Procedures

Lists adjustments and performance verification tests required after assembly replacement.

17. Functional Tests

Functional Test Performance Verification

Describes tests to ensure analyzer operation and conformance to published specifications.

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