Chapter 7 1-Port Cable Loss Testing
68
CellAdvisor JD720C User's Manual
4
For JD725C and JD726C users with the option 001 Bias Tee installed. To use the Bias Tee,
complete the following steps:
a
Select
On
for the
Bias Tee
.
b
Enter a value between
12
and
32
with 1 V step, as you desire.
NOTE
If you have set this Bias Tee to
On
, the instrument will supply a DC bias of set level
(12
– 32 V) from the
RF In
port to an active device, such as Tower Mounted Amplifier
(TMA) or Low Noise Amplifier (LNA), through the transmission line, eliminating the
need of an external power supply.
5
Tap the
Apply
button in the lower-right corner of the setup screen to save the change(s).
Performing calibration
Perform the O-S-L Calibration by pressing the
CAL
hard key. The instrument displays
on-screen instructions for you to follow through. See
“Performing Calibration” on page 33 for
more information.
Making a measurement
Once the O-S-L calibration is done, the instrument is now ready to make a cable loss
measurement.
Procedure
1
Do one of the following:
–
Disconnect the calibration kit from the calibration point and leave it open.
–
Connect the calibration kit
2
Your measurement result is displayed on the screen in real time.
Figure 36
Cable connection diagram for cable loss measurements
JD723C/724C
