HP 8414A Operating And Service Manual page 21

Model 8414A Section III
Operation
Display A. Polar Display with BEAM CTR Pushbutton Depressed, Showing Beam Correctly
Centered with HORIZ POS and VERT POS Controls.
Display
B.
Swept Polar Display Correctly Calibrated for
r = 1.0 /_+180°
(Reflectometer
Shorted at UNKNOWN port).
Figure 3-11. Typical Polar Displays During Initial Calibration Adjustment
3-11