Chapter 15
Using Cable and Antenna Analyzer
536
JD700B Series User’s Guide
2)
Alternate sweep on:
NOTE
You can use the
LIMIT
hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See “Setting limit for cable and antenna analyzer” on page
544 for more information.
Performing cable loss (1 port) measurements
The Cable Loss (1 Port) measurement quantifies signal loss through a cable or other device over a defined
frequency range by range by connecting one end of the cable to the instrument measurement port and
terminating the other end of the cable with a short, or leaving it open altogether. This measurement can be
particularly useful in measuring the loss of feed line connected to the antenna.
Making a measurement
Procedure
1
Make a proper cable connection as described in “Connecting a cable for cable loss (1 port)
measurements” on page 529.
2
Press the
MEASURE SETUP
hot key.
3
Press the
Data Points
soft key to change the resolution of your measurement, and then select
the data point option:
126
,
251
,
501
,
1001
, and
2001
. Changing the data point does not affect
current calibration.
NOTE
The larger number you choose, the higher resolution you get and the longer the
instrument takes to sweep and display results. Selecting the data point larger than what
you need for a measurement will result in unnecessarily long sweep time. It is
recommended that you select high resolution data points only for an instance of
measuring wide frequency bands or requiring precise measurement data.
4
Optional
. To turn the bias tee on, complete the following steps:
Toggle the
Bias Tee
soft key and select
On
.
Enter a value between 12 and 32 with 0.1 V step, and then press the
V
soft key.
NOTE
The instrument’s built-in bias tee function (option 002) supplies 12-32 VDC bias to active
devices through the
RF In
port, eliminating the need of an external power supply.
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