Publicité
Les langues disponibles
Les langues disponibles
TESTING CABLE & DETERMINING LENGTH
Once a cable's NVP value has been set, the cable length can be determined
using Test Mode. As stated in Preparing to Test Cables, the cable to be
tested should be le ft. open on the opposite end from the tester. A cable
terminated with an impedance closely matching the characteristic
impedance of the cable can produce inaccurate test results.
• Testing Cable:
1. Attach the cable to be tested as instructed in Preparing to Test
Cables section.
2. Note that the connection to the cable to be tested should be as
short as possible to ensure the Ranger™ TDR does not see the
impedance continuity at the attachment point as a fault.
3. Determine the correct NVP value for the cable to be tested as
instructed in Obtaining NVP Values section.
4. Set the NVP value as instructed in Setting NVP Values section.
5. Turn the unit on by pressing the Power button.
6. Change the unit of measurement if necessary by pressing and
holding the Memory and Calibration buttons at the same time.
7. Press the Test button once. A ft.er a moment, the calculated length
of the cable will appear in the upper right hand corner of the screen.
8. The screen will display "Short" if the two conductors are directly
connected or have a low resistance connection between them.
The length will be shown up to the shorted point.
9. The screen will display "Open" if the two conductors are not
directly connected or have a high resistance connection between
them. This is the normal condition for performing length testing.
If there is an unexpected open condition along the length of the
cable, only the length up to that point will be displayed.
10. The screen will display "Error" and show dashes instead of the
length if an error condition has occurred. This could be because
the cable is improperly terminated or there has been excessive
signal loss.
•
Step 7
Step 10
11
Publicité
