N8976B Noise Figure Analyzer Repair N8976B

Shenzhen Maikairui Instruments provides repair services: repair of Agilent KEYSIGHT spectrum analyzers, network analyzers, signal generators, oscilloscopes, signal analyzers

Repair spectrum analyzers, network analyzers, signal generators, oscilloscopes, signal analyzers, etc. Especially when seeking repairs from the original manufacturer, the cost is high, the repair cycle is long, and inspection fees and shipping charges are incurred, increasing the maintenance and repair costs for the requester. If your spectrum analyzer, network analyzer, signal generator, oscilloscope, or signal analyzer experiences the following faults, you can contact us to try:
Repairable faults: N8976B Noise Figure Analyzer Repair N8976B
1. Power supply failure: Unable to power on normally
2. Input failure: Port not responding normally; no output; no input; abnormal signal
3. Test analysis failure: Abnormal test results; calibration failure; out of tolerance
4. Display failure: Screen artifacts; black screen
5. Key failure: Keys unresponsive; adjustment knobs unresponsive
6. Interface failure: Does not recognize storage media; unable to connect to the control system
7. Other usage issues, etc.
Repair process:


Provide inspection, quote after inspection;
If the user agrees to repair, repairs begin after confirmation;
If the user disagrees, the instrument is returned.
Repair advantages: Short repair cycle, low cost, and warranty service provided;
Quality assurance: After repair, the instrument is calibrated by a metrology unit and issued a "Metrology Qualification Certificate".

1. Unable to power on

2. Error message upon power-on

3. Repeated restarts or crashes

4. Unable to enter the test system upon power-on

5. No display upon power-on

6. Screen artifacts or white screen

7. Unable to receive signals or inaccurate received power values

8. Unable to communicate via GPIB, USB, etc.

9. Received power value too low or too high

10. Abnormal waveform after power-on

11. Other issues, etc.

Maikairui Instruments repair features: N8976B Noise Figure Analyzer Repair N8976B

Genuine parts

Free inspection

Chip-level repair

High repair rate
Repair process: Shipment inspection — After inspection — User confirmation — Begin repair

Repair advantages: As a secondary distributor for Tektronix and Agilent, repairs are 50% cheaper than the parent company. With skilled repair personnel, short repair cycles, low cost, and warranty provided.
II. Fault manifestation: Instrument powers on but fails to boot
III. Repair process: N8976B Noise Figure Analyzer Repair N8976B

Based on the customer's description of a black screen fault, the instrument powers on but fails to boot normally, though the keypad lights up. Therefore, it is initially judged that there is an issue with the internal display panel. The next step involves disassembling the instrument for inspection, revealing damage to the display panel assembly and no backlight. After careful troubleshooting, it is found that the internal spring of the power output ribbon cable is loose, and some parts are burnt, causing abnormal power supply and a black screen.

Replace the damaged display panel components and repair the circuit. After reassembly, the instrument powers on normally. At this point, the customer's reported issue of failure to boot is resolved. Thinking the instrument is ready for pickup, it is tested before shipment, only to find the black screen issue persists.
Where exactly is this black screen issue coming from? The instrument must be disassembled again for further inspection... Previously focused only on fixing the boot failure, only the display panel was checked, overlooking other areas. Further disassembly and inspection reveal damage to the display module. After repair, the instrument powers on and displays normally. After a period of boot testing, the instrument remains stable. Finally, the instrument can be prepared for customer pickup.

IV. Summary: N8976B Noise Figure Analyzer Repair N8976B

After disassembly, inspection, and replacement of damaged parts, the repair is completed. The lesson from this repair is that during the process, one should not only focus on the fault reported by the customer but also check for other potential issues in the instrument.

N8976B Keysight Noise Analyzer 10MHz~40GHz
Integrated solution with a frequency range of 10 MHz to 40 GHz

N8976B Keysight Noise Analyzer 10MHz~40GHz

Key Features and Specifications

Integrated solution with a frequency range of 10 MHz to 40 GHz

Multi-touch interface

Includes spectrum analyzer and IQ analyzer (basic) modes

Built-in standard options include P44, PFR, FSA, NFE, and B25

2.4 mm (male) input connector

Compatible with series noise sources

Includes U7227F 2 GHz to 50 GHz external USB preamplifier and 346CK40 1 GHz to 40 GHz noise source

Keysight N8976B Noise Figure Analyzer is suitable for performing fast, accurate, and repeatable noise system measurements. When used with SNS series noise sources and U7227 series USB preamplifiers, the N8976B can automatically download ENR data from the SNS and data from the USB preamplifier. N8976B multi-touch interface supports gestures such as zooming, pinching, and dragging. Most menus can be accessed by touching the screen with a finger, without switching screens.

Integrated calibration allows setting up to 12 devices under test (DUTs) in one step, significantly simplifying noise source calibration in Y-factor measurements. With internal calibration functionality, users no longer need to calibrate when testing various types of DUTs, saving valuable test time.

The built-in noise figure uncertainty calculator can pre-fill data from SNS noise sources, USB preamplifiers, and all necessary instrument parameters, such as analyzer noise figure, gain, noise figure uncertainty, and matching. The default noise figure settings provide simultaneous noise figure and gain measurements. In Table view, you can simultaneously view multiple measurement results in tabular form, including noise figure, noise factor, Y-factor, gain, hot power (Phot), cold power (Pcold), and effective temperature (Teffective).

N8976B Keysight Noise Analyzer 10MHz~40GHz