Operation; Getting Started; Cable/Network Type And General Setup; Determining And Measuring Vp Values - Chauvin Arnoux CA 7028 Manual De Instrucciones

4. OPERATION

4.1

Getting Started

The instrument is switched on and off using the green power button found on the lower right
side of the front panel.
Chauvin Arnoux
Wire Mapper Pro V1.0
TIA568 UTP Vp=75%
When the unit is first switched on, it will display the opening screen giving the software
version and remaining battery capacity.
The wire type (TIA568, STP...) and the Vp (Velocity of Propogation) is also displayed. The
change these settings, see § 4.2 below.
4.2

Cable/Network Type and General Setup

To enter a menu for Cable and Network selection:
• Press down on the , button, then press the
Typical display:
>
Type = TIA568 STP
Vp = 71%
Feet
Eng (USA)
Contrast
The > (line selector) is moved by pressing the
selected, the and
SERVICE / Vp LENGTH / Vp
decrement through the alternative options for the selected item.
• Under Type, the following selections can be made:
TIA568 STP TIA568 UTP
NOTE: For testing of wiremap in accordance with ISO11801 & EN50137 the product should
be set to TIA568 which is the equivalent standard.
button.
MAP /
button. When the appropriate line is
MAP /
buttons may be pressed to increment or
ISDN/RNIS USOC UTP USOC STP
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For FTP and SSTP cables use the STP setting.
• Vp is selectable in the range 20% to 100%.
(see § 4.3 if the Vp is not known)
• The Wire Mapper Pro™ may be set to measure cable length in feet or
meters.
• The instrument may be set to operate in English (USA or UK), French,
German, Italian or Spanish.
• The display contrast may be set by selecting Contrast and then pressing
the button to decrease the contrast or the
SERVICE / Vp
to increase the contrast and optimize the display to the ambient lighting
conditions. The unit also has a display backlight.
• To exit set up mode, press the
4.3

Determining and Measuring Vp Values

Vp, or Velocity of Propagation, values are characteristic of each cable type and brand. The
Vp is used to measure the length of a cable and to measure a fault location. The more
accurate the Vp, the more accurate the measurement result will be.
The cable manufacturer may list the Vp on their specification sheet or may be able to
provide it when asked. Sometimes this value is not readily available, or the user may wish to
determine it specifically to compensate for cable batch variations, or for special cable
applications. This is quite easy:
1. Take a cable sample of exact length increments (ft or m) longer than 60ft (20m).
2. Measure the exact length of the cable using a tape measure.
3. Connect one end of the cable to the Wire Mapper Pro™ (see § 4.11).
Leave the end un-terminated and make sure the wires do not short to each other.
4. Measure the length and adjust the Vp until the exact length is displayed.
5. When the exact length is displayed, Vp is established.
button
LENGTH / Vp
button.
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