8754A Operating Information page 4 -
last paragraph:
S-Parameter Test Set. Transmission and reflection measurements on
two port devices wh.ich require
measurement of both forward and reverse characteristics can be
accomplished using the 8748A S-Parameter
Test Set. This test set contains the necessary splitter, couplers,
and switches to measure forward and reverse
characteristics without disconnecting the reversing the test
device, a 0 to 70 dB, 10 dB step attenuator to
control the incident signal level, and includes the necessary
equal length signal cables and interface cable to
connect the test set to the 8754A. Connect the test device using
the 11857A Test Port Extension Cables or
the 11608A, 11600B, or 11602B Transistor Fixtures.
Am 20.02.2022 um 17:36 schrieb John Lyles:
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S parameters, as you know, can be characterized by S11, S21, S12
and S22. The two port test sets have enough directional couplers
and power splitters inside to measure all four, by switching the
direction of the RF feed, if directed to do all four measurements
by the VNA controller. However, the 8754A was built long before
that became a necessity for fast bench measurements. There are
still just two ports on the test set, I am sorry if I confused the
topic. I meant four S parameters being measured.
