Agilent Technologies ES, 8753ET quick start Measuring S11 and S22 or Reflection in a Polar Format

Quick Start: Learning How to Make Measurements

Learning to Make Reflection Measurements

Measuring S11 and S22 or Reflection in a Polar Format.

1.Press Format POLAR .

2.Press Scale Ref AUTO SCALE to reposition the trace, as shown in Figure 2-14.

The analyzer shows the results of an S11 or reflection measurement with each point on

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 Figure 2-14represents ρ = 2.00, or 200% 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 MARKER MODE MENU POLAR MKR MENU .

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 if you want the analyzer to show the linear magnitude and the phase of the marker.

•Choose LOG MKR if you want the analyzer to show the logarithmic magnitude and 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 if you want the analyzer to show the values of the marker as a 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.

Chapter 2 2-21