Megger TDR2050 Bedienungsanleitung

3. CONNECTION

For best performance ensure that the

test leads are not unduly separated

Only use Megger approved fused

test leads

Ensure that the test leads are in good

condition and working order

TDR2050 Quick Start Guide

2. SELECT TEST MODE

Press to select

Hold

TDR2050

Hold

TDR2050

1. POWER UP

Press and hold to turn TDR on

Hold

TDR2050

Press OK key to select

b. Use cursor keys to select test mode

required - choose T1

4. SELECT PARAMETERS

a. Press spanner/setting symbol

c. Set cable impedance

If the impedance is unknown, set to max using

the

arrows. Press when set.

b. Set correct velocity factor

(obtained from cable manufacturer) for the cable

to be tested. If unknown, see last page for

examples. Adjust using the UP DOWN arrows.

Press when set.

d. Set gain

Set to a level which best shows by toggling

the gain using trace arrows. Press when set.

Hold

TDR2050

VF = 0.54R Z = 140 = 6 = 40ns 100m

AUTO MAN

f. Cable distance

Adjust to a distance greater than the known

cable length.

e. Set output pulse width

Set at mid point and toggle up / down until fault

becomes clear. Press when set.

Set at low pulse width for near end faults. Set at high pulse

width for distant faults and concentric cables.

Hold

TDR2050

VF = 0.54R Z = 140 = 6 = 40ns 100m

AUTO MAN

Hold

TDR2050

VF = 0.54R Z = 140 = 6 = 40ns 100m

AUTO MAN

Hold

TDR2050

VF = 0.54R Z = 140 = 6 = 40ns 100m

AUTO MAN

Hold

TDR2050

VF = 0.54R Z = 140 = 6 = 40ns 100m

AUTO MAN

IMPORTANT:

Ensure you are on manual mode.

AUTO MAN

5. MOVING CURSOR

Hold

TDR2050

C1-C2

To select cursors press a. Cursor choice. b. Swap between cursors. Press C1 - C2

buttons to select cursor to move.

c. Use left/right arrows to move d. Cursor position on trace. Move cursor e. Delta measurement. TDR shows total

selected cursor. C1 to end of test leads about 1.5 m. distance to cursor C2 and difference

Move C2 to the end of the cable between C1 and C2.

(ﬁrst signiﬁcant reﬂection)

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

mm2V. 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 in20.52 156 78

PILC 0.3 in20.52 156 78.5

PILC 0.4 in20.53 156 79

PILC 0.5 in20.55 165 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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