Microtest MICROSCANNER Guide de l'utilisateur télécharger pdf (Page 5)

MICROSCANNER

ENGLISH - 5

Setting the NVP percentage

Once in Calibrate Mode, the default NVP

(Nominal Velocity of Propagation) will be

displayed followed by the overall cable length. The

cable length is measured with the currently stored

NVP.

NVP is the measure of how fast a signal travels

down a cable compared to the speed of light. The

result will be represented as a percentage of the

speed of light. For an accurate length test, the

NVP must be set correctly.

If you know a cable's NVP, change the displayed

numbers using the ▲▼ keys until the appropriate

NVP is displayed. The cable length will automati-

cally adjust to the new NVP.

If you know a cable's length, change the shown

NVP using the ▲▼ keys until the appropriate

length is displayed. The NVP can be adjusted in

1% increments, and the length changes accord-

ingly.

Cables used for calibration must be at least 50

feet (15 meters) long. Cable lengths of less than

50 feet will display FAULT.

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Microtest MICROSCANNER Guide de l'utilisateur Page 5