Bedienungsanleitung Fluke networks TS 100 Cable Fault Finder (Seite 16 von 20) (Englisch)

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TS100 Cable Fault Finder

Users Guide

Note

The actual VOP of any particular cable is

dependent on the conductor spacing and the

material between the conductors and could

vary by as much as ±5 feet (±2 meters) from the

value listed in Table 2.

To set the VOP for more accurate length

measurements, see “Velocity of Propagation” on page

6. See Table 2 and Table 3 for the VOP values for many

cable types and conditions.

Maximum Length

The maximum length of cable that can correctly be

measured by the TS100 is determined by several

factors. The most significant is the signal loss of the

cable itself. When the signal loss in a particular cable is

large enough, the tester cannot “hear” the TDR echo

and cannot determine the length of that cable. In this

situation, the tester displays “Err” on the display. The

amount of signal loss in a cable is determined by the

characteristics of that cable and its length. The

maximum length shown in Table 2 is the length above

which the tester is not expected to be able to make a

valid measurement. For lengths above those stated in

Table 2, the tester’s accuracy is not specified.

Frequently Asked Questions

Q: How do I calibrate or perform a self test on the

tester?

A: There are no adjustments inside the tester, and the

internal coating protects the critical components from

moisture and contaminants. There is nothing to

calibrate. A self test is performed by the tester every

time you turn it on. Since there is no loss of any settings

when the tester is off, there is no penalty to just

turning it off and on if you wish to perform a self test.

The tester displays 8.8.8.8. during the self test.

Q: Does it matter which clip lead I connect to which

wire in the cable under test?

A: Not for any of the testing functions. However, when

you connect the tester to a cable, if you connect the red

lead first, an invalid reading may be displayed until the

full connection is made with both leads. The tester’s

TDR technology requires both leads be connected to

the wire pair or cable in order to determine its length.

While using only one of the leads is useful in tracing

cable position with the injected tone, both leads are

required to make valid length measurements.

Q: What does the low battery indicator really indicate?

A: The LED comes on (flashes) when the battery

voltage falls below 4.1 volts, indicating that you should

replace the batteries. While the tester will continue to

operate for at least 1 hour below this voltage, some

readings may be less accurate.

Q: I tested an orange outdoor 25 foot (8 meter)

extension cord and the display read 19 feet (6 meters).

Is the tester broken?

A: No. The accuracy of the reading is dependent on the

setting of the VOP. While the nominal setting for

general testing is -66-, the VOP for that kind of cable is

-56-. To improve the accuracy of length measurements

for that or any cable, change the VOP as shown in the

instructions in the Velocity of Propagation section.

Q: Why does the length reading sometimes change a

small amount when I open and short the far end of a

test cable?

A: There are two causes. The first is that this is a

characteristic of the measurement technique used in

almost all low and medium cost cable length test tools.

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