Atec Agilent-8719E-8720E-8722E - Manual (Page 23)

23
Measurement capabilities
Number of display channels
Four display channels available.
Number of measurement channels
Two primary (independent) and two auxiliary
(dependent) measurement channels available.
Parameters
S
11
: Forward reflection (input match)
S
21
: Forward transmission (insertion
loss/gain/phase)
S
12
: Reverse transmission (reverse isolation)
S
22
: Reverse reflection (output match)
A, B, R: Receiver signal level
A/R, B/R, A/B: Ratioed receiver signals
• Parameter conversion
Z – Reflection: equivalent parallel impedance
Y – Reflection: equivalent parallel admittance
Z – Transmission: equivalent series impedance
Y – Transmission: equivalent series admittance
1/S: complex inverse of S-parameters
Display formats
• Cartesian Log/linear magnitude, phase, group
delay, SWR, real, and imaginary.
• Smith chart Log/linear magnitude and phase,
R+jX, G+jB, or real/imaginary markers.
• Polar Linear/log magnitude, phase, or real and
imaginary markers.
Markers
Data markers
Each display channel has five independent markers
that can be displayed simultaneously. Twenty inde-
pendent markers can be displayed in the 4-channel
display mode when markers are uncoupled.
Marker control
Discrete (actual measurement points) or continuous
(linearly interpolated between points, with 1 Hz
resolution).
Delta markers
Displays difference in both stimulus (for example,
frequency) and response (for example, dB)
between active marker and reference marker.
Polar format markers
Linear magnitude and phase; log magnitude (dB)
and phase; real and imaginary.
Smith chart format markers
Linear magnitude and phase; log magnitude (dB)
and phase; real and imaginary (R+jI); complex
impedance (R+jX); complex admittance (G+jB).
Search
Finds maximum, minimum, or target value.
Bandwidth
Finds and displays center frequency, bandwidth at a
user-defined level (for example, –3 dB), Q factor, and
shape factor (ratio of 60 dB and 6 dB bandwidths);
updates while tuning with tracking enabled.
Statistics
Calculates and displays mean, standard deviation,
and peak-to-peak deviation of trace; active between
two markers or over entire trace.
Tracking
Performs new search (min/max/target) continuously
or on demand.
Marker-to functions
Set start, stop, or center to active marker stimulus
values; set span to active and delta marker stimu-
lus values; set reference to active marker response
value; set electrical delay to active marker phase
response value.
Group delay characteristics
Group delay is computed by measuring the phase
change within a specified frequency step (deter-
mined by the frequency span, and the number of
points per sweep).
Aperture
Selectable. Maximum aperture: 20% of frequency
span. Minimum aperture: (frequency span)/
(number of points–1).
Range
The maximum delay is limited to measuring no
more than 180° of phase change within the mini-
mum aperture. Range= 1/(2 x minimum aperture).
Accuracy
In general, the following formula can be used to
determine the accuracy, in seconds, of a specific
group delay measurement: ±0.003 x phase accuracy
(deg))/aperture(Hz).
System capabilities