S820E UG PN: 10580-00343 Rev. H 4-17
Calibration, CAA 4-3 Calibration Procedures
Temperature Window
For accurate results, the instrument must be calibrated at the ambient
temperature after allowing for warm-up time (approximately 10 minutes)
and before making any measurements. The S820E must be re-calibrated
whenever the internal instrument temperature exceeds the calibration
temperature window (±10 ºC) or when the test port extension cables or
adapters are removed or replaced. The instrument must also be re-calibrated
every time the frequency range changes.
To ensure that you consistently obtain accurate measurements, the
Site Master continuously monitors its internal temperature and compares
that to the actual calibration temperature that was recorded when the last
calibration was performed. If these 2 values differ by ±10 degrees or more,
then the Site Master displays , indicating that the
current temperature has exceeded the calibration temperature window.
Anritsu recommends that you perform a new calibration after this occurs in
order to continue making accurate measurements. Alternatively, if the
instrument temperature comes back into the valid calibration temperature
window, then you may reactivate the existing calibration by turning it back
on in the Calibration Menu.
If you turn off the correction by using the Cal Correction button, then the
Site Master displays . In this case, you can re-enable the
calibration by simply setting the Cal Correction back to On (as long as the
valid calibration temperature window has not been exceeded).
Save and Recall Calibration Coefficients
Calibration information is included when a setup (.stp) file is saved (even if
the Cal Correction is Off). The calibration information is recalled with a setup
file and can be applied if the current internal instrument temperature is
within the saved calibration window.
Calibration information is not included when a measurement (.dat) file is
saved.
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