Calibration Before S21 Measurement - Deepace KC901M User Manual

interpolation errors. Therefore, its accuracy is higher than the factory calibration and
the system calibration. User calibration is only effective for the set frequency. If the
setting parameters are changed, the calibration data will be useless though, it will be
saved temporarily lest we go back to the last setting parameters; in this case the
previous calibration data is still valid.
Calibration procedure
Under the S11 and S21 display modes, every menu on the very right side has
"CAL Select". It's for switching among system calibration, user calibration and shut
down calibration.
To start out the user calibration, choose "RE CAL".
In FUNC menu, access into the system calibration with the combined key
SHIFT+7 .
When entering the calibration interface, the surface will pop up specific
operating methods. When carrying out the S11 calibration, users can SKIP the loading
procedure (LOAD).
The electric length of calibration module's electric length parameters must be preset
first in FUNC menu.

3.3 Calibration before S21 Measurement

As long as within the dynamic range, series attenuators (above 6dB) are highly
recommended to minimize the errors.
If the DUT is small and light, you can connect the DUT's port to the instrument
directly, although it is not a good practice. In this case, only one RF cable is needed for
a complete testing system. If the DUT is too big and heavy or the adaptor does not
match, then you need two RF cables.
Chart 3-1A: Connect with one cable in calibration
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