Teardown & Experiments with an Anritsu MS9710B 0.6-1.75um Optical Spectrum Analyzer

In this episode Shahriar repairs¬†an Anritsu MS9710B Optical Spectrum Analyzer. The instrument intermittently does not boot and when it does it generates a Grating Mirror error. Some investigation reveals that the problems may simply be poor internal cabling connections which can be resolved by cleaning all connectors and re-building the unit. The LCD screen’s CCFL have also failed. An LED back-light replacement provides the screen with a vibrant and bright colors.

The unit is very compact (which is unusual for an Optical Spectrum Analyzer) and makes it ideal for bench-top working environments. The broad-spectrum built-in reference laser can be used to calibrate and align the instrument which proves to work perfectly. After calibration, a laser diode from an Agilent Lightwave Transmitter is measured. Interestingly it can be seen that the unit produces two tones at ~1nm apart which indicates the laser operates in two modes. A very interesting result given that the wavelength meter only reports one tone at the average wavelength of the two modes.

2 comments

  1. Silvio Araujo says:

    Sorry I forgot to include the Agilent E4440A.

  2. Silvio Araujo says:

    I am very pleased with the manner of the video and it’s conducted procedure. I have an issue with similar unit in regards of the firmware installation. we have 22 options on our unit and the 115 option with the 512mB compact flash. Upon re-storing system I can only upload some options. not all of them. it seems that it is in the initial configuration. Since Drive I: gets completely full and I get an error. Is there any suggestions?
    Thank you

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