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Chapter 7 1-Port Cable Loss Testing
4
5
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
2
Figure 36
68
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.
Tap the Apply button in the lower-right corner of the setup screen to save the change(s).
Do one of the following:
–
Disconnect the calibration kit from the calibration point and leave it open.
–
Connect the calibration kit's SHORT standard as shown in Figure 36.
Your measurement result is displayed on the screen in real time.
Cable connection diagram for cable loss measurements
CellAdvisor JD720C User's Manual
JD723C/724C
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