Agilent Technologies ESA-E Series, User Manual

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Chapter 3 17
Making Measurements
Making Cable Fault Measurements
Making Cable Fault Measurements
Purpose
A cable fault location measurement displays the reflected signal of a transmission
line as a function of the distance down the line. This complements the return loss
measurement described in the following section: if a cable under test fails a return
loss measurement, a cable fault location measurement can be used to identify the
location of the fault. The measurement is particularly useful when a transceiver
and antenna are connected by a long length of cable.
Calibrating the System
For the following procedure, use the appropriate 50 ohm or 75 ohm cables and
accessories listed in
Table 3-1 .
A return loss measurement requires the use of a power divider.
1. Enter cable fault location mode and access the measurement.
a. Press the
Mode
front panel key.
b. Press the
Cable Fault Location
menu key.
c. Connect the equipment as prompted by the dialog box and illustrated in
Figure 3-1 .
Table 3-1 Cables and Accessories
Cable/Accessory Quantity 50 Ohm Setup
Part Number 75 Ohm Setup
Part Number
Coaxial cable 2 8121-0101 5062-6452
Power divider 1 11636A 0955-0752
Coaxial load 1 909A Option 012 909E
6 dB Attenuator (50 ohm only) 2 0955-0826 n/a
Adapter 75 ohm N(f) to
75 ohm BNC(f) (75 ohm only) 1 n/a 1250-1536
Adapter 75 ohm N(m) to
75 ohm BNC(f) (75 ohm only) 1 n/a 1250-1535