Megger CFL510F Data sheet
Hand-held Time Domain Reflectometer
CFL510F
Hand-held Time Domain Reflectometer
■
Six ranges for testing power, cellular,
CATV, and telephone cables
■
Large high resolution backlit LCD
■
25 Ω, 50 Ω, 75 Ω, and 100 Ω output
impedance
■
Gain, balance, and contrast controls
front-panel accessible
■
FastFind automatic event locator
CFL510F
DESCRIPTION
The Megger CFL510F is an advanced instrument capable of
identifying a wide range of cable faults using Time
Domain Reflectometry. It offers exceptional features and a
range capability normally associated with larger, more
expensive instruments. The measurement range spans
from 30 feet to 9,000 feet, with a minimum resolution of
four inches.
The Model CFL510F can be used on any cable consisting
of at least two insulated metallic elements, one of which
may be the sheath or shield of the cable. The CFL510F has
nal matching networks to allow testing of 25-, 50-, 75-,
inter
and 100-
Ω cables. (These correspond to power, cellular,
CATV, and telephone cable). The FastFind key simplifies
waveform interpretation by automatically adjusting the
instrument's range and gain and places the measur
ement
cursor at the major event on the cable.
The instrument can be closely matched to the cable using
the balance control allowing long lengths of cable to be
easily tested and faults close to the instrument accurately
measured. The propagation velocity value can be similarly
adjusted to match the cable; thus ensuring an accurate
distance measur
ement. To enable a wider range of faults
to be detected, the gain of the instrument is also
adjustable which helps the user identify minor faults over
the entir
e cable length.
Other user adjustable settings include changing the
distance measurement units between meters and feet and
adjusting the propagation velocity units between a ratio
and meters per microsecond. Display contrast can be set
to compensate for all viewing conditions and a back lit
LCD assists in low ambient light conditions.
The CFL510F is housed in a rugged ABS enclosure which
is dust and weatherproof to IP54. The unit also comes
complete with a carrying case containing lead storage, belt
clip, and shoulder straps. It is powered by manganesealkali, nickel-cadmium or nickel-metal-hydride batteries.
The batteries are stored in a compartment on the back of
the TDR, secured by two screws, and held in a carrier.
This not only contains them securely but also allows for a
quick change of rechargeable battery packs.
APPLICATIONS
This CFL510F is primarily designed for linemen in both the
communication and power industries. Specific capabilities
include:
Telephony
ovides fast and accurate results when uncovering
Pr
transmission related problems. Designed to be carried on a
linesman’s belt and used in the first line of defense when
diagnosing and locating cable faults.
Specific line activities identified by this unit include:
■
Bridge taps and splices
■
esence of water in the cable
Pr
■
Opens in tip, ring, or sheath
■
Shorts between tip, ring, and/or sheath
■
Capacitive networks
■
Load coils
■
Wet splices and high-resistance splices
CFL510F
and-held Time Domain Reflectometer
H
CATV/Cellular
deal for testing the physical integrity of cables within a
I
etwork. The unit is also capable of locating illegal cable
n
taps.
Specific cable conditions identified include:
■
Bends or crimps in the cable
■
Cuts or shorts in the cable
■
Taps and splits
■
Water saturation
Power
An ideal tool for identifying faults on secondary power
cables. This unit identifies:
■
Burnouts in aluminum conductors
■
Good splices, wet splices, and high-resistance splices
■
Shorts between phases
FEATURES AND BENEFITS
■
Large backlit display and ability to operate in
temperatures as low as -4oF (-20oC) allow use in a
vast range of locations and conditions.
■
Accurate to 4 in. on shortest range.
■
Six selectable ranges (from 30 to 9000 ft.) allow for
effective fault locating on long- and short-range fault
conditions.
■
Contrast control compensates for ambient lighting.
■
Balance control nulls the initial transmitted pulse to
allow the user to see faults close to the instrument.
■
Four gain settings for each range allow the user to
adjust the amplification of the trace to detect a wider
range of faults.
■
FastFind key simplies operation by automatically
adjusting the instrument's range and gain and places
the measurement cursor at the major event on the cable.
■
nal voltage blocking filter provides input pr
Inter
otection
up to 300 volts.
PECIFICATIONS
S
Except where otherwise stated, this specification applies at an
ambient temperature of -4o F (20oC).
General
Ranges (at 0.67 VF)
30 ft, 90 ft, 300 ft, 900 ft, 3000 ft, 9,000 ft
(10 m, 30 m, 100 m, 300 m, 1000 m, 3000 m)
Accuracy
±1% of range ± pixel at 0.67 VF for 30 ft and 90 ft
(10 m and 30 m) range
Resolution
1% of range
Gain
Set for each range with four user selectable steps
Velocity Factor
ariable from 0.01 to 0.99 in steps of 0.01
V
Output Pulse
5 V peak to peak into open circuit
Output Impedance
User selectable between 25 Ω, 50 Ω, 75 Ω, and 100 Ω switchable
Balance Adjustment
0 to 120 Ω
Update Rate
Once per second for 5 minutes after last key press
Power Down
Automatic after 5 minutes with no key press
Display
Liquid crystal, 128 x 64 pixels with backlight. Backlight stays on
for 1 minute when activated.
Power
Six LR6 (AA) type batteries, Manganese-alkali or nickel-cadmium
cells
Nominal voltage - 9 V for alkali or 7.2 V for NiCad.
Low battery warning occurs at 6.5 V
Battery consumption 100 mA nominal 140 mA with back lit LCD.
(20/30 hours continuous use depending on backlight dependency)
Safety
Complies with IEC61010-1 for connections to live systems up to
300 V CAT III
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