134 Keysight N9915-90020 User’s Guide
Calibration for NA, CAT, and VVM ModesFUTURE
10.Press Start Calibration. When prompted, verify the ECal module
connection, then press Measure. The standards within the ECal module
are automatically connected and measured.
Simple Response Cals
Simple Response Cals are used to quickly calibrate the magnitude and phase
of a measurement using any Open, Short, or Thru component. These may be
calibration standards, but because a Cal Kit is not selected, they are not
modeled. Measurement accuracy is generally low. Use a Simple Response Cal
to make quick measurements when using a jumper cable to connect the DUT
to the FieldFox. Otherwise, CalReady is usually more accurate.
When prompted, choose a standard based on the displayed measurements to
be calibrated. For example, to calibrate S11, connect either an OPEN or
SHORT to the port 1 reference plane.
When Simple Response Cals are performed, the source match and reflection
tracking terms from CalReady are updated by the measured Short or Open that
is used during the calibration.
’Unknown THRU’: When prompted: “Connect port 1 to port 2", then
connect port and port 2, using a coaxial cable or an appropriate thru
adapter. Do NOT use the internal ECal THRU, because the ECal thru
calibration model is incorrect for this calibration type.
‘Flush THRU’: When prompted: “Connect port 1 directly to port 2", then
you must connect the ports directly together at the calibration reference
plane with no adapter or other cabling.
Learn more in
“Calibration Type” on page 136.
IMPORTANT!
The Simple Response calibration assumes an ideal response for the
standard. DUT measurements after a Simple Response calibration will
have a measurement bias equivalent to the deviation of the response of the
device used as the Simple Response standard from the ideal response.
Note, that an Open Response is simply a normalization, a Short response is
a normalization with 180 degree phase offset. When selecting a standard
from the 85058B calibration kit for a Short Response we suggest using
short # 1 because it has the smallest delay of the four shorts and would
thus be most similar to an ideal short.
For better accuracy, perform a mechanical calibration by referring to
“Mechanical Cal” on page 129.
You can perform a Simple Response Cal for either: S11, or S22, or S21 AND
S12.
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