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Summary of Contents for Megger TDR900
- Page 1 Megger TDR900 Time Domain Reflectometer ____________________________________ USER’S MANUAL © Copyright 2003 Fine Instruments Corp. All right reserved. Specifications subject to change without notice. Litho in Korea. www.netzerotools.com...
- Page 2 www.netzerotools.com 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...
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Page 3: Table Of Contents
www.netzerotools.com CONTENTS 1. Safety Information 1. Safety Information Safety Warnings 2. The TDR Cable Length Meter This Meter c omplies with the safety requirements of IEC 1010-1 : 2001. It is 3. Controls, Indicators, and Buttons Overview designed for use on de-energized circuits only, however this Meter is protected 4. -
Page 4: The Tdr Cable Length Meter
www.netzerotools.com 2. The TDR Cable Length Meter 3. Controls, Indicators, and Buttons Overview Although this manual describes the operation of the Meter for both Metric The Meter is a handheld and battery operated instrument capable of measuring measurement and English measurement, all illustrations and examples assume use cable lengths and finding distance to an open or a short using TDR(Time Domain of the Meter for English measurement. - Page 5 www.netzerotools.com (1) DISPLAY (3) MENU (on screen) SELECTION BUTTONS Each setting of the Meter to a measurement function may activate one or more Extra-large backlit (ICON type 7 segment) LCD. When the Meter is turned on, menu selection button settings on the LCD. Press the corresponding menu all display segments and symbols appear briefly (during 1.5 seconds) for a selection button to select the desired measurement.
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Page 6: Meter Operation
www.netzerotools.com Unshielded multi-core 4. Meter Operation cable : Connect the two clips to any two wires. 4.1 Principles of operation 4.3 How to set the cable type The Meter works by measuring the time taken for a signal to travel to the far end of The Meter needs to be set for the cable type to be tested before being used to take the cable (or to an intermediate fault) and to return. -
Page 7: Cable Library For 39 Standard Cable Types
www.netzerotools.com 4.3.2 Cable library for 39 standard cable types “ blinking ” Fig. 4 5. Scroll through the library using the buttons to find the required cable type. The types are displayed in the Library Number order. The 39 standard cable types are listed in Section 4.3.2 and Section 4.3.3 will explain you how to make the library of 20 customer cable types using the memory mode. -
Page 8: Testing Cables Not Included In Library
www.netzerotools.com 4.3.3 Testing cables not included in library 6. Press the OK button again then the default V.O.P value of 66.0 % will start to blink. If the cable type to be tested is not in the library, it can still be tested if the V.O.P is known. -
Page 9: How To Determine Unknown V.o.p Settings
www.netzerotools.com 4.4 How to determine unknown V.O.P settings 5. Press the OK button. 6. Press the TEST button to read the V.O.P of the sample cable, when the center The Calibrate Cable function allows you to determine the V.O.P for a known length line segment of 6 digits will blink waiting for the next measurement. - Page 10 www.netzerotools.com STORE : This Meter has 20 internal memory locations from 01 to 20. Press the If you want to cancel storing the V.O.P setting, press the EXIT button to have STORE button to store the next available memory location when the memory the Meter exit memory mode.
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Page 11: How To Measure Cable Length
www.netzerotools.com CLEAR : Select CLEAR to erase the stored value pressing the CLEAR button after 4.5 How to measure cable length having the Meter enter into the memory mode. The upper display will show the V.O.P value of the memory location 01 and the 01 ( 1 ) Set the cable type or the V.O.P for the cable to be measured. -
Page 12: Changing The Measurement Scale Between English And Metric
www.netzerotools.com 5. Changing the Measurement Scale between English and Metric 6. Measurement Accuracy Choice of the measur ement units : This Meter can display cable lengths in For coaxial, twisted pair and shielded cable types, an accuracy of 2 % (of ei ther Engli sh s ys tem (ft, i n) or Metric s ys tem ( m, cm). -
Page 13: Theoretical And Actual V.o.p
www.netzerotools.com 7. Theoretical and Actual V.O.P 8. Special Features Theoretically V.O.P can be calculated from the dielectric constant, but actual values 8.1 Low battery indication often differ slightly from the theoretical one. In an actual cable the dielectric may not fill up the space between the conductors completely. -
Page 14: Enable Or Disable The Auto-Power-Off Mode
www.netzerotools.com 8.3 Enable or disable the auto-power-off mode 8.4 Tone Generator mode You can customize the required default setting between Enable and Disable settings The Meter generates an oscillating (810 - 1100 Hz) tone, which is transmitted by pressing the POWER button for about 2 seconds during the button being down the cable under test and can be picked up with a standard tone probe (not depressed, when the Meter will display “... -
Page 15: Maintenance
www.netzerotools.com 9. Maintenance 10. Specifications B a t t e r y Depends upon the V.O.P of the cables under test. Maximum Range 12,000 ft (3.7 km)@ V.O.P 99.9 % The Meter requires 4 LR6 (AA) type 1.5 volt alkaline batteries. When the batteries 9,800 ft (3.0 km)@ V.O.P 80.0 % need being replaced, the Meter displays “... - Page 16 www.netzerotools.com W e i g h t : Approx. 16 oz (450 g) Repair and Warranty P r o t e c t i o n : Ov erv ol tage protec tion against telephone network voltages (EN 60950 : 1999 Sec. 2.3) The Meter contains statically sensitive devices and is not user serviceable.
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