
Metrology: standards 219
Figure 8.36
A box that can act as an approximate 4P open or short standard. Note the
different labeling of 4P connections for the two configurations.
sliding terminations, 1P standards made of an air line which electrical
length can be mechanically varied by acting on a slide, terminated with
a load. The sliding load is employed by performing several measurements
and different line lengths; the resulting measurement set can be math-
ematically or graphically treated (with the help of the Smith chart) to
simulate the measurement on a reference impedance.
The actual nominal impedance value of each standard is given ...