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What is the calibration interval for the 8901B power meter and AM/FM calibrators?

Power Meter:

If the unit is left powered up and the temperature is stable, calibrating once a week is no problem, and calibrating once a month may be possible if nothing happens to the power sensor like over power or mechanical shock.

As suggested, a means of doing a quick check to verify that the calibration has not drifted unacceptablely should be implemented. The idea of switching the 8657A through the interface would work fine.

AM/FM Calibrators:

The AM/FM calibrators were designed to verify that the 8901A/B is meeting its +/-1% AM/FM accuracy specification. So when the AM/FM calibration routines are run using the calibrators, as long as the reading is between 99% and 100%, the 8901B is calibrated. This should remain within these limits for better than one year. Agilent employees with a lot of experience with this have seen units 5 years old still meeting the +/-1% specification.

This information is subject to change without notice and is provided "as is" with no warranty. Agilent Technologies shall not be liable for any direct, indirect, special, incidental or consequential damages in connection with the use of this material.