HP 8753ES Installation And Quick Start Manual page 56

Quick Start: Learning How to Make Measurements
Learning to Make Reflection Measurements
Measuring S and S
11
1. Press
POLAR
Format
2. Press
Scale Ref
The analyzer shows the results of an S
the polar trace corresponding to a particular value of both magnitude and phase. The
center of the circle represents a coefficient (Γ) of 0, (that is, a perfect match or no
reflected signal). The notation 2U FS or 2 units full scale indicates that the
outermost circumference of the scale shown in
reflection. The phase angle is read directly from this display. The 3 o'clock position
corresponds to zero phase angle, (that is, the reflected signal is at the same phase as the
incident signal). Phase differences of 90°, 180°, and −90° correspond to the 12 o'clock, 9
o'clock, and 6 o'clock positions on the polar display, respectively.
3. Press
Marker Fctn
4. Turn the front panel knob to position the marker at any desired point on the trace, then
read the frequency, linear magnitude and phase in the upper right-hand corner of the
display.
• Choose
LIN MKR
phase of the marker.
• Choose
LOG MKR
the phase of the active marker. This is useful as a fast method of obtaining a reading
of the log-magnitude value without changing to log-magnitude format.
• Choose
Re/Im MKR
real and imaginary pair.
NOTE You can also enter the frequency of interest, from either the numeric keypad
or the optional attached keyboard, and read the magnitude and phase at that
point.
Figure 2-14 Example S
2-20
in a Polar Format.
22
.
to reposition the trace, as shown in
AUTO SCALE
11
MARKER MODE MENU
if you want the analyzer to show the linear magnitude and the
if you want the analyzer to show the logarithmic magnitude and
if you want the analyzer to show the values of the marker as a
Measurement Trace in Polar Format
11
or reflection measurement with each point on
represents ρ = 2.00, or 200%
Figure 2-14
POLAR MKR MENU
Figure 2-14.
.
Chapter 2