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The 37xxxE is a self-contained, fully integrated measurement system
that includes an optional time domain capability. The system
hardware consists of the following:
q Analyzer
q Precision components required for calibration and performance
verification
q Optional use of Anritsu 67XXB, 68XXXA/B/C, or 69XXXA/B as a
second source
The 37xxxE internal system modules perform the following functions:
Source Module This module provides the stimulus to the device under test (DUT). The
frequency range of the source and test set modules establish the
frequency range of the system. The frequency stability of the source is
an important factor in the accuracy (especially phase accuracy) of the
network analyzer. Hence, the 37xxxE always phase locks the source to
an internal 10 MHz crystal reference.
Test Set Module The test set module routes the stimulus signal to the DUT and sam
-
ples the reflected and transmitted signals. The type of connector used
is important, as is the “Auto Reversing” feature. Auto Reversing means
that it applies the stimulus signal in both the forward and reverse di
-
rection. The direction is reversed automatically. This saves you from
having to reverse the test device physically to measure all four scatter
-
ing parameters (S-parameters). Frequency conversion (1st and 2nd
IFs) occurs in the test set module.
Analyzer Module The analyzer module down-converts, receives, and interprets the 3rd
IF signal for phase and magnitude data. It then displays the results of
this analysis on a large, 190 mm (7-1/2 inch) diagonal color display.
This display can show all four S-parameters simultaneously. In addi
-
tion to the installed display, you can also view the measurement re
-
sults on an external color monitor.
GENERAL DESCRIPTION NETWORK ANALYZERS, A PRIMER
3-4 37xxxE OM
REFLECTED
INCIDENT
TERMINATION
TEST
DEVICE
Return Loss (dB)
Reflection Coefficients (S11, S22)
Reflection Coefficients vs Distance
(Fourier Transform)
Impedance (R + j X)
SWR
Figure 3-2. Reflection Measurements