HP 8754A - Measurement; Impedance - Using the Smith Chart

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Mode18754A
512 = 0.2 L 63°
Set Test Set:
Sll/S21'
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Set 8754A:
dB Reference
Phase Reference dB Reference Phase Reference
POLAR AIR = SII = pL f/J
B/R,CH2 }__
PHASE BIR, CH 2 - S21 - T L f/J
Set Test Set:
S22
/S
12.
Set 8754A:
)
POLAR AIR = S22 = P L f/J
511 = 0.13 L 33°
521 = 10 L _41°
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BIR, CH 2 } - S - T L f/J
dB Reference Phase Reference
dB Reference
Phase Reference
PHASE B/R, CH 2 - 12 - ·
Impedance · Using the Smith Chart
Impedance can be read directly from the polar display for S 11 or S 22 by installing the Smith Chart
overlay. See Page 24.
Select Sll/S21, press
POLAR AIR and use the Reflection Coefficient Measurement sequence, Page 23, to
measure SII' Press-to-release POLAR AIR and alternate between CHANNEL 2 B/R and PHASE B/R to
obtain magnitude and phase values for S21' The transmission coefficient linear magnitude value, 7, is
calculated
from the dB magnitude ratio using the same equation used for ,0. Select S22/S12 and repeat this
sequence
for the reverse parameters.
S-Parameter Measurements
Measure forward and reverse S-parameters as follows:
Measurement
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