HP 8753E manual To Use Smith Chart Markers, Sin 0, where M=magnitude, ~~~~~~~ ~~~~~~, ‘j3JU

2.Select the type of polar marker you want from the following choices:

Choose ;&X#“?!&% if you want to view the magnitude and the phase of the active marker.

n .:/.:.. :.

The magnitude values appear in units and the phase values appear in degrees.

. Choose ;.~~~~~~ if you witnt to view the logarithmic magnitude and the phase of the

. . . . . . . . . . . . . . . . . . . .

active marker. The magnitude values appear in dE? and the phase values appear in degrees.

nChoose %@&tt;JjX$I$ if you want to view the real and imaginary pair, where the complex data is separated into its real part and imaginary part. The analyzer shows the first marker value the real part (M cos 0), and the second value is the imaginary part

(M sin 0, where M=magnitude).

t

Figure 2-16.Example of a Log Marker in Polar Format

To Use Smith Chart Markers

The amount of power reflected from a device is directly related to the impedance of the device and the measuring system. Each value of the reflection coefficient (I’) uniquely deties a device impedance; r = 0 only occurs when the device and analyzer impedance are exactly the same.

The reflection coefficient for a short circuit is: r = 1 L BOO. Every other value for I’ also corresponds uniquely to a complex device impedance, according to the equation:

zL = [( 1 + r) I (1 - r)lxz,

where ZL is your test device impedance and Z0 is the measuring system’s characteristic impedance.

Note	For greater accuracy when using markers in the Smith chart format, it
	is recommended to activate the discrete marker mode. Press (j-1
	................ 1...............;;..\			..*/... .:	................,,,,,,,,,,..~	,, ,,*; ,;*.. “‘..T i	., /,. ,,......A c,.,.,.,., .,.a ..:.:		::.:......s....._..,. ....,..
	~~~~~~~ ~~~~~~.
	..,..,.,.,....L....,a.. ........A			.>>d.. .	. i:....A.....A	2 ;;;._...: ../ ..i_ii..A		_	. .::..::..:::::.::.::::.
1. Press (jjj ~~#@j?IjI				‘j3JU&&.
	. . . . . . . . . . . . . . . ..................:..:...:....			........... .::::.	.....~~~.............~.;;;.i
	/		;<.:	~~:::::/	::.<.z .;:	::~:...::~:::::~:p .;	................	:,:::;, ::-:<::<:
				:.y,., ..::::
2. Ress (Marker] ~~~~~~~~~ ~~~~~~~~ ad turn the front panel knob, or
		.,.,,.,.vii		~;;~~	~_/	.............................. ..i........ A.....::>........;	,...,i..	.._	,

enter a value from the front panel keypad to read the resistive and reactive components of the complex impedance at any point along the trace. This is the default Smith chart marker.

Making Measurements 2-25