PEWA Megger TDR500 User manual

Twisted Pair
Co-ax
TDR500 User Guide
TIME DOMAIN
REFLECTOMETER
Main Type Sub Type Velocity Factor
Polyethylene
Jelly Filled Polyethylene
PTFE (Teflon)
Paper (Pulp 0.083uf/mile)
Paper (Pulp 0.072uf/mile)
Foam Polyethylene
Air Spaced Co-axial
Air
Solid Polyethylene
Megger Limited
Archcliffe Road, Dover
Kent CT17 9EN England
T+44 (0)1 304 502101
F+44 (0)1 304 207342
[e-mail]
TYPICAL CABLE VELOCITY FACTORS
0.67
0.64
0.71
0.72
0.88
0.82
0.94
0.98
0.67
TELECOMMUNICATIONS CABLES
Plc
Gel filled
19 AWG 0.72
22 AWG 0.67
24 AWG 0.66
26 AWG 0.65
19 AWG 0.68
22 AWG 0.62
24 AWG 0.60
26 AWG 0.58
Pulp
Service Wire
22 AWG 0.67/0.71
24 AWG 0.68
26 AWG 0.66
0.64
SAFETY WARNINGS
●This instrument is not to be used on
energised cable.
●The instrument should not be used if any part
of it is damaged.
●Disconnect the test leads before accessing
the battery compartment.
●Refer to operating instructions for further
explanation and precautions.
●Safety Warnings and Precautions must be read
and understood before the instrument is used.
They must be observed during use.
NOTE: THE INSTRUMENT MUST ONLY BE USED BY
SUITABLY TRAINED AND COMPETENT PERSONS
OPEN
CONDUCTOR
SHORTED
CONDUCTOR
SPLICE
BRIDGE TAP
SPLIT/
RESPLIT
WET SPLICE/
WATER
FRAYED
CABLE
WATER
INGRESS
TAP
SPLITTER
Mechanical
The instrument is designed for use indoors or outdoors and is
rated to IP54.
Case Dimensions 230mm long (9 inches)
115mm wide (4.5 inches)
48mm deep (2 inches)
Instrument Weight 0.6kg (1.32lbs)
Case Material ABS
Connectors BNC Terminal
Test Lead 300mm long with croc clips.
Display 122 x 32 pixel Graphics LCD.
Environmental
Operational Temperature -15OCto +50OC
(5OFto 122OF)
Storage Temperature -20OCto 70OC
(-4OFto 158OF)
Ordering Information
TDR 500
Included Accessories
Test & Carry case with strap 6420-125
Lead Set 6231-694
User Guide 6172-726
This instrument is manufactured in the United Kingdom.
The company reserves the right to change the specification or design
without prior notice.
Megger is a registered trademark
Part No 6172-726 V02 Printed in England 1105
www.megger.com
Megger Limited
Archcliffe Road, Dover
Kent CT17 9EN England
T+44 (0)1 304 502101
F+44 (0)1 304 207342
[e-mail]
Megger
4271 Bronze Way, Dallas,
Texas 75237-1019 USA
T+1 800 723 2861 (USA ONLY)
T [phone]
F [phone]
[e-mail]
Megger
Z.A. Du Buisson de la Couldre
23 rue Eugène Henaff
78190 TRAPPES France
T+33 (0)1 30.16.08.90
F+33 (0)1 34.61.23.77
[e-mail]

VF
232.1m 0.67R
Battery State Indicator
Blinking signal gives the warning of low
battery indicating when the battery volts
drop to 6.5V.
Cursor Position
This indicates the current cursor position in
metres or feet.
Velocity Factor Indicator
Indicates the current velocity factor as either
aratio of the speed of light (R), or as m/µs
or ft/µs.
Menu
The menu allows the units of the distance
and velocity factor to be changed.
To enter the menu, switch the instrument on
holding down the warble key.
To change the displayed units, press one of
the velocity factor keys. The options
available are m and Ratio, m and m/us,
ft and Ratio and ft and ft/us.
When selected, either switch the instrument
off, or press the warble key to start testing.
Cursor Left
This control moves the cursor to the left.
Range
This is a bi-directional range control. Press the left
side to decrease the gain, right side to increase.
Cursor Right
This control moves the cursor to the right.
Power
Pressing this button will turn the instrument on or
off depending on the current state.
Velocity Factor
Use this key to change the velocity factor to a
suitable value for the cable under test.
Warble
Press to select the warble functions, or to return to
TDR functions. Warble function can be used to
trace cables.
VF
+
SPECIFICATION
Except where otherwise stated, this specification applies at an
ambient temperature of 20OC.
General
Ranges 30m, 100m, 300m, 1000m, 3000m.
(100ft, 300ft, 1000ft, 3000ft, 10,000ft.)
Accuracy ± 1% of range ± pixel at 0.67VF
[Note:- the measurement accuracy is
for the indicated cursor position only
and is conditional on the velocity factor
being correct.]
Resolution 1% of range.
Input Protection For connection to unenergised cable
only.
Output Pulse 5 volts peak to peak into open circuit
from 100Ωsource. Pulse widths
determined by range and cable
impedance.
Gain Automatic with gain and range.
Velocity Factor Variable from 0.01 to 0.99
in steps of 0.01.
Refresh Rate Three times a second.
Power Down Automatic after 5 minutes
with no key press.
Warble 5V pk-pk from 100Ω,alternating
between 810Hz and 1110Hz.
Batteries Six LR6 (AA) type batteries,
Manganese-alkali or nickel-cadmium
or nickel-metal-hydride cells.
Nominal Voltage 9V for Alkali or 7.2V for NiCad.
Battery Consumption 100mA nominal.
(30 hours’ continuous use.)
Safety This instrument is to be used on
unenergised cable only.
EMC Complies with Electromagnetic
Compatibility Specifications
(Light industrial) BS EN 61326-1,with a
minimum performance of ‘B’ for all
immunity tests.