HP 8754A - Calibration

Model 8754A
Calibration
Calibrate the ~754A/8748A combination as follows:
S21 - Forward Transmission
S-Parameter Measurements
Connect "through."
Set Test Set: S11 /S2 1.
Perform Insertion Loss or Gain Calibration, B/R, using Channel 2, see Page 18.
Perform Insertion Phase Calibration, PHASE B/R, using Channel 2, see Page 19,
but do
not adjust Channel 2 OFFSET vernier.
S12 - Reverse Transmission
Set Test Set: S22 /S12 .
Verify
that both B/R and PHASE B/R measurements remain near 0 dB, 0° for both for-
ward
and reverse. Any offsets between forward and reverse must be noted and manually
subtracted from the measured value. A phase-length difference between forward and reverse
will
occur if the connections from ports 1 and 2 to the test device are not the same length.
S 11 - Input Reflection
Connect short circuit to Port 1 measurement plane.
Set Test Set:
S11 /S21'
Perform Reflection Coefficient Calibration, POLAR AIR, see Page 23, but do not ad-
just CHANNEL 2 OFFSET vernier.
S22 - Output Reflection
Connect short circuit to Port 2 measurement plane.
Set Test Set: S22 /S12'
Verify
that trace remains near outer circle, ± 180° for both forward and reverse. Any off-
sets
between forward and reverse must be noted and manually subtracted from the mea-
sured value. A phase-length difference between forward and reverse will occur if the connec-
tions from
ports 1 and 2 to the test device are not the same length.
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