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Why must the Keysight E6452A be calibrated after a firmware upgrade? Why do I get a second firmware upgrade message after ugrading the firmware?

When the current E74xx Drive Test Solutions software runs with older E6452A receivers the amplitude accuracy may no longer meet its published amplitude calibration specifications (by 1 to 4 dB). This is due to a firmware upgrade that changes the tuning equation of the E6452A. Affected receivers should be returned to an Keysight service center for a complimentary (no charge) calibration that will restore your receiver to its specified performance.

The following E6452A serial numbers are affected:

Refer to E6452A Serial Numbers

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