Anritsu MS2024B Manual page 67

Field Measurements
The MS20xxB VNA Master and the S412E LMR Master are equipped with a cable list, which
includes most of the common cables that are used today. After the correct cable has been
selected, the instrument updates the propagation velocity and the cable attenuation values to
correspond with the cable. These values can also be entered manually and can be uploaded
via Master Software Tools. Incorrect propagation velocity values affect the distance accuracy,
and inaccurate cable attenuation values affect the accuracy of the magnitude value.
DTF Example
Figure 5-8 on page 5-16
Procedure
1. If a test port extension cable is to be used, then connect it to the VNA Port 1 connector
on the instrument.
2. Ensure that the instrument is in Vector Network Analyzer mode. Then press the Shift
key and the System (8) key.
3. Press the Application Options soft key. The Meas Menu soft key toggles between Field and
VNA. The active measurement function is underlined.
Press the soft key (if necessary) until Field is underlined, then press the Back key. The
Measure menu now displays field measurement functions.
4. Press the Measure function hard key and then the Display Type soft key. From the list
box, select Single, and then press Enter.
5. Press the Measure function hard key and select DTF Return Loss (or DTF VSWR).
The Measurement Type soft key shows the name in the soft key face.
6. Press the Freq/Dist function hard key and set the Start Frequency, and Stop Frequency.
7. Press the Units soft key to select meters or feet.
8. Press the More soft key.
a. Press the Cable List soft key to select the cable type, then skip to
cable is not listed, then set the cable loss and propagation velocity manually, as
described in
b. Press the Cable Loss soft key to set a cable loss value.
c. Press the Propagation Velocity soft key and set Propagation Velocity
between 0.001 and 1.000.
d. If desired, press the Windowing soft key and select a windowing type. Refer to
Section 9-4 "Windowing" on page
e. Press the Back soft key to return to the Freq/Dist menu.
9. Press the Distance Info soft key to view settings and parameter values. This window may
contain suggestions to improve the measurement results. Use the rotary knob to scroll
through the Distance Info window data. For more information about the Distance Info
window, refer to
10. Press the Esc key to close the Distance Info window.
11. Press the Sweep function hard key and then the Data Points soft key to set the number
of data points to be included in the sweep (the larger the number of data points, the
longer the maximum distance, at the expense of a slower sweep speed).
Vector Network Analyzer MG
shows a DTF Return Loss measurement.
Step b and Step c.
Section 9-6 "Distance Information" on page
PN: 10580-00289 Rev. K
5-9 Distance-To-Fault (DTF)
9-4.
Step d. If the
9-6.
5-15