Teardown & Repair of an Agilent 1169A 12GHz Smart Active Probe (And a Puzzle!)

In this episode Shahriar examines a failed Agilent 1169A 12GHz Smart Active Probe. The probe does not get recognized by the oscilloscope and therefore cannot be calibrated. The instrument uses an I2C interface to the probe to download the probe’s specifications and characteristics.

The probe teardown reveals a simple I2C EEPROM IC. After removing the IC it becomes clear that the chip is damaged and must be replaced. A duplicate probe is used to copy the EEPROM data onto a new IC which revives the probe. With the help of the community, the CRC checksum code is discovered and the probe is assigned a new serial number.

One comment

  1. Hi Shariar,

    you cold buy a second probe of the same type, read it out and see at which locations the EEPROM content differs.

    I also tried to use the AutoProbe interface for my own stuff, and Keysight was not really helpful.
    They want to keep this interface proprietary and not having others develop compatible probes that might be better or cheaper.

    Some info:
    https://electronicprojectsforfun.wordpress.com/using-the-keysight-autoprobe-interface-in-your-own-projects/

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