DG-OHM
UNAOHM Srl Rev. 4.0
22
11.4 CLC FUNCTION
(DISTRIBUTION CONTROL, LENGTH CALCULATION FROM THE CABLE FAULT POINT
)
This function calculates the distance of a fault on a cable due to impedance mismatch. Such
defects, caused by distribution, may depend on an open, bent, or generally ruined cable.
To use the CLC function, you will need to work with a noise generator and set the DG-OHM in
spectrum analyzer mode,
button.
1. Connect the instrument input BNC to a noise generator by means of the T-connector.
2.
Activate the noise generator.
3. Attenuate the signal in order to put it in a readable scale (using the
buttons) or
activate the automatic attenuator (press and hold
).
4. Connect the distribution cable to the T-connector.
5. If distribution presents an impedance mismatch, linearity will not be seen on the
spectrum, but valleys or holes.
6. Set the SPAN with a value suitable for obtaining 2 valleys on the screen (press and
hold
). Point the first market on the first valley or hole.
7. Activate the CLC functions: single press
to open the side boxes. Select CLC ON
and press
to deactivate the side menus.
8. Move the second marker (using the
keys) in frequency until you find the next or
previous valley or hole.
9. Read the distance of the impedance mismatch as follows:
PEE: distance by mismatched expanded cables.
PE: distance by mismatched compact cables.
Point 5
Point 6
Point 7 ; point 8
