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T
ime Domain Reflectometer
Megger TDR900
USER’S
MANUAL
Megger 4271 Bronze Way
Dallas TX 75237-1017 USA.
T +1 (800) 723 2861. (USA only)
T +1 (214) 330 3203. (International)
F +1 (214) 337 3038.
Megger PO Box 9007 Valley Forge
PA 19485-9007 USA.
T +1 (610) 676 8500.
F +1 (610) 676 8610.
Www. megger.com
© Copyright 2003 Fine Instruments Corp. All right reserved.
Specifications subject to change without notice.
Litho in Korea.
Basic Specifications
Maximum Range : Depends upon the V.O.P of the cables under test.
12,000 ft (3.7 km)@ V.O.P 99.9 %
9,800 ft (3.0 km)@ V.O.P 80.0 %
8,000 ft (2.4 km)@ V.O.P 66.0 %
6,200 ft (1.9 km)@ V.O.P 50.0 %
Range Selection : Automatic range control
Resolution : 20 inches (50 cm)
Accuracy : ± 2 % of reading + 20 inches (50 cm) < 300 ft
(100 m)
± 2 % of reading > 300 ft (100 m)
This accuracy
i
s effective for
C
oaxial Cables up to 8,000 ft, Telephony
Cab
l
es up to 6,000 ft, and Structured Wiring up to 3,000 ft.
Output Impedance : 25, 50, 75, 100, 125 or 150 ohms
Impedance Selection : Automatic output impedance control
Velocity Factor : Adjustable from 1.0 % to 99.9 %
Tone Generator : Oscillating 810 - 1100 Hz (5 V
p-p
unloaded)
Cable Library : 39 standard cable types
Memory Location : 20 for custom cable types
Connector : BNC
Input Protection : 250 V RMS
Line Voltage Detection : 6.5 V
SOURCES LIKE SMALL HAND-HELD RADIO
TR ANSCEIVERS, FI XED STA TION RA DIO
AND TELEVISION TRANSMITTERS, VEHICLE
RA DIO TR ANSM IT TERS AND CEL LUL AR
PHONES GENERATE ELECT ROMAGNET IC
RADIATION THAT MAY INDUCE VOLTAGES
IN THE TEST LEADS OF THE MULTIMETER.
IN SU CH CASES THE ACCURA CY OF T HE
MULT IMETER C ANNOT BE GUARAN TEED
DUE TO PHYSICAL REASONS.
W A R N I N G !
Warning
The product should not be connected to any energized
circuits. Connection to mains supply voltages will damage
the Meter and could be hazardous to the user.
The product contains parts that can be damaged by static
disc harge. Disc harge the c able t o be te st ed be fore
connecting the product to the cable.
Read “Safety Information” before using this Meter.
1
1. Safety Information 3
2. The TDR Cable Length Meter 4
3. Controls, Indicators, and Buttons Overview 5
4. Meter Operation 8
4.1 Principles of operation 8
4.2 How to connect a cable to the Meter 8
4.3 How to set the cable type 9
4.3.1 Selecting a library cable type 9
4.3.2 Cable library for 39 standard cable types 10
4.3.3 Testing cables not included in library 12
4.4 How to determine unknown V.O.P settings 14
4.4.1 Expanding cable library
for custom cable types using nonvolatile memory 15
4.5 How to measure cable length 19
4.6 How to check networks (Thin Ethernet) 19
5. Changing the measurement scale between English and Metric 20
6. Measurement accuracy 21
7. Theoretical and actual V.O.P 22
8. Special features 23
8.1 Low battery indication 23
8.2 Overrange indication 23
8.3 Enable or disable the auto-power-off mode 24
8.4 Tone Generator mode 25
8.5 Line Voltage Detection mode 25
9. Maintenance 26
10. Specifications 27
Repair and Warranty
CONTENTS
Safety Warnings
This
Meter c omplies
wit h t he safety requiremen
t
s of IEC 1010-1 : 2 001.
I
t is
designed
for
use on de-energized
circui
t
s only, however this Meter
is protec
t
ed
against telephone networking voltages (EN 60950 : 1999 Sec. 2.3). Connection to
any mains supply voltages may result in damage to the Meter and/or a hazard to
the user. Hence the user must assume responsibility for ensuring his or her own
safety.
International Symbols used on the Meter
Caution! Refer to the explanation in this manual.
Double insulation or Reinforced insulation
Battery
Meter complies with current EU Directives.
International Standards
Safety : IEC 1010-1 : 2001
EMC : EN 61326 : 1997
+
A
1
: 1998
1. Safety Information
EMC Standard Category of Pass
ESD IEC 1000-4-2 A
EM IEC 1000-4-3 A
Burst IEC 1000-4-4 A
Surge IEC 1000-4-5 A
Conducted RF IEC 1000-4-6 A
2 3
Produktspecifikationer
| Varumärke: | Megger |
| Kategori: | mätning |
| Modell: | TDR900 |
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