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7
Figure 53
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
2
3
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.
Tap the Apply button in the lower-right corner of the setup screen to save the change(s).
General setup window for 2 port transmission measurement
Disconnect the calibrated extension cable from the RF In port of the instrument.
Connect your DUT between the extension cable and the RF In port as illustrated in Figure 54.
Your measurement result is displayed on the screen in real time.
CellAdvisor JD720C Series User's Manual
Chapter 10 2-Port Transmission Testing
91
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