8. TYPICAL VELOCITY FACTORS
These values of velocity factor are typical and may be used in the
absence of known values of cables.
These values may need changing after verifying on a specific cable.
Five output impedances are available (25, 50, 75, 100, 140 ohms) and
an auto impedance matching feature. The velocity factor can be set
between 0.2 and 0.99 to meet any cable test requirements.
Material
Cross section
mm
2
V. F m/μS m/uS
XLPE 35 0.52 156 78
XLPE 50 0.52 156 78
XLPE 70 0.53 160 80
XLPE 95 0.53 160 80
XLPE 185 0.55 165 81.5
XLPE 240 0.56 168 82
XLPE 300 0.56 170 82
XLPE 500 0.56 173 82.5
XLPE 630 0.57 173 82.5
PILC 70 0.52 156 78
PILC 185 0.52 156 78.5
PILC 240 0.53 156 79
PILC 300 0.55 165 80
PILC 0.1 in
2
0.52 156 78
PILC 0.3 in
2
0.52 156 78.5
PILC 0.4 in
2
0.53 156 79
PILC 0.5 in
2
0.55 165 80
Megger Instruments Limited, Archcliffe Road, Dover, Kent, CT17 9EN, England
T +44 (0)1 304 502101 F +44 (0)1 304 207342
Part No. 1005-021
Megger is a registered trademark
TDR2050_QS_EN_V01
Printed in England www.megger.com
This instrument is manufactured in the United Kingdom. The company reserves the right to change the specification or design without prior notice.
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