Chapter 10 2-Port Transmission Testing
CellAdvisor JD720C Series User
’s Manual
91
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.
7
Tap the
Apply
button in the lower-right corner of the setup screen to save the change(s).
Figure 53
General setup window for 2 port transmission measurement
Performing calibration
Perform the O-S-L-Thru calibration by pressing the
CAL
hard key. The instrument displays
on-screen instructions for you to follow through. See
“Performing 2-port calibration” on page
40 for more information.
Making a measurement
Once the calibration is done, the instrument is now ready to make a measurement.
Procedure
1
Disconnect the calibrated extension cable from the
RF In
port of the instrument.
2
Connect your DUT between the extension cable and the
RF In
3
Your measurement result is displayed on the screen in real time.
