Chapter 8 1-Port Phase Testing
76
CellAdvisor JD720C User's Manual
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 measurement.
Procedure
1
Disconnect the calibration kit from the calibration point.
2
Connect an antenna or feed line to the calibration point, where is usually at the extension cable
end if used. See
for the cable connection diagram.
3
Your measurement result is displayed on the screen in real time.
CAUTION
Do not apply or connect power exc25 dBm to the
RF Out / Reflection
port. When
the input signal power is greater than +25 dBm, the input power protection is triggered to
protect the instrument and a measurement comes to stop automatically.
NOTE
Do not change the connected port extension cable or frequency settings, or it may cause a
measurement error.
WARNING
Do not attempt to connect the instrument to the antenna when there is a risk of lightning.
Electric shock may cause malfunction of or damage to the instrument.
