Bedienungsanleitung Fluke networks TS 100 Cable Fault Finder (Seite 17 von 20) (Englisch)

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Frequently Asked Questions

In the case of the TS100 Cable Fault Finder, the variance

occurs in only a few cable types and both readings are

within the specified accuracy of the instrument. The

second cause occurs when the cable is coiled, as in a

box or on a spool. The magnetic field caused by the

TDR signal itself couples across to other parts of the

cable and changes the characteristics of the reflections.

Q: Why, on some cables, does the number displayed

jump between 2 or 3 different values?

A: As the TDR signal travels down a cable, it loses some

of its strength. At some point, the noise on the cable

has an amplitude similar to the reduced strength TDR

signal and will influence the measurement results. The

tester’s software filters out many of the noise related

variations in the displayed length, but some variations

do get through.

Q: I accidentally cracked the plastic housing, does this

affect the moisture protection of the components?

A: Not at all. The component protection is provided by

a coating on the components and Printed Circuit Board

(PCB).

However, if sufficient plastic is missing then a possible

shock hazard exists. You should not use the tester until

the plastic is repaired or replaced.

Q: Can this tester measure the length of single

conductor wires like THHN?

A: No. All TS100 measurements must be made on TWO

conductors from the SAME END of a cable.

Q: If I touch the bare metal of the wires or clip leads,

will the measurement be affected?

A: After BOTH clips are connected, measurement

results will ordinarily not be affected if inappropriate

human contact is made with the input connectors.

Under moist conditions, if a large surface area of cable

is in contact with moist skin, some readings may be

affected.

Q: On multi-conductor cables with a short between

two of the conductors, I sometimes read an “open” at

twice the known length of the cable.

A: If the cable has more than two conductors, and a

short exists at the far end between one of the

conductors you are connected to and a conductor you

are not connected to, the displayed length will be the

SUM of the lengths of the conductors joined by the

short. TS100 can only correctly test the two conductors

you are connected to. See “Applications” on page 7 for

multi-conductor cables.

Q: When testing a set of wires that go into a conduit, I

sometimes get a reading of 0 or 1. Why?

A: If there is more than a foot or so of wires that are

physically separated before they enter the close

confinement of the conduit, this will look to the tester

like an open at the start of the cable. Remember that

TS100 reports the FIRST failure that it finds. Try

bringing the two wires of the pair closer together for

the path from TS100 to the entry to the conduit.

Q: When connecting to a 6 foot (2 meter) piece of 50Ω

Coax with the alligator clips, the tester reads 8 feet (3

meters). What’s up?

A: When measuring a low impedance small cable (less

than 15 feet [5 meters]), the clip leads can add up to 2

feet (1 meter) of length. For longer or high impedance

cables, the clip leads have no effect.

Q: How does the tester react to a speaker or a

transformer at the end of a cable?

A: A speaker or a transformer is actually a large coil of

wire. This will usually cause the length reading to be

larger than that of the cable alone. A moderate power

speaker will add 500 feet (150 meters) to the length

reading. Some combinations of speakers and

transformers connected to the cable may prevent the

tester from making a valid reading.

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Fluke networks TS 100 Cable Fault Finder Seite 17

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