Atec Megger-MFT1500 Series - Manual (Page 2)

MFT1500 Series
Combined Insulation, Loop & RCD Tester
■ Variable buzzer threshold controls the limit at which
the continuity buzzer stops sounding. Selected from 2 Ω
to 100 Ω in 6 steps.
■ Lead null stores the test lead resistance and deducts this
value from the continuity result, even if the instrument is
switched off. Thus reducing the chance of possible
measurement errors.
Insulation testing:
■ Insulation test at 250 V, 500 V and 1000 V for testing
low voltage applications. A 1000 V warning is issued
prior to performing the 1000 V insulation test.
■ Live circuit warning when performing insulation or
continuity measurements a live circuit warning is
displayed and an audible warning sounded if connected
to a circuit with a voltage greater than 25 V (15 V for
continuity testing).
■ Safety lockout at voltages greater than 55 V during
continuity and insulation testing, the instrument
automatically warns the operator and inhibits any
testing, preventing accidental damage to the instrument
and full protection to the operator.
■ The ‘Auto discharge’ facility safely discharges all
circuits after an insulation test, preventing accidental
shock from a stored charge on a long cable during or
after disconnection.
LOOP TESTING
■ Low current loop test is a 3 wire non-tripping
0.01 Ω loop test designed to prevent RCD tripping by
using a sophisticated 15 mA loop test pioneered by
Megger Limited. This NO-TRIP test ensures the RCD will
not trip whilst performing a loop impedance test.
■ High current loop test at 25 A provides a fast loop test
where no RCD is fitted, or for Ze measurement on the
incoming side of an RCD.
■ Supply voltage and polarity indication upon
connection to the mains supply the polarity and voltage
are displayed to show correct wiring of the socket under
test or test lead connections. This function also provides
a warning of live voltages while continuity or insulation
testing.
■ Phase-Phase Phase-Neutral and Phase-Earth Loop Tests
are possible. No danger of damage from accidental 3-
phase connection.
■ Wide supply voltage; allows loop measurements from
55 V to 480 V. No damage if accidentally connected
across phases.
■ Prospective short-circuit current (PSC) A dedicated
PSC range, using either the 25 A high current loop test or
no-trip test, is provided for rapid measurement of Loop
currents, both at the socket outlet and distribution
board. The PSC ranges from 1 A to 19.9 kA with a
resolution of 1 A, 10 A and 100 A depending on range. All
the loop and PSC tests are auto-ranging.
RCD TESTING:
■ 10 mA to 1000 mA RCD ranges. All standard RCDs
from 10 mA to 1000 mA are fully supported. All standard
RCD test functions are available with both 0° and 180°
phase angle at
1/2 I, I and 5I up to 300 mA.
■ RCD ramp test measures the RCD trip current. The
ramp test displays the actual trip current on all RCD
ranges instead of trip time. Ideal for identifying nuisance
tripping RCDs. The current is stepped up from
1/2 I to I in
200 ms steps.
■ Fault (Touch) voltage can now be set for either 25 V or
50 V depending on application.
■ Fault/touch voltage can also be displayed up to 100 V on
a selectable bargraph.
■ DC sensitive, RCD test option enables testing at 1/2 I,
I and 5I.
GENERAL FEATURES:
■ Quick to pick up and use by using colour coded
ranges and no hidden functions the MFT1500 series takes
minutes to learn how to use. Function buttons are
colour matched to the test mode to ensure easy
operation.
■ Visible and audible Safety warning features are
paramount with live circuit warning and protection
circuitry. If live voltages exist on a circuit during
insulation or continuity testing the voltage is displayed
on the screen. If this voltage exceeds a safe level, the
MFT1500 series inhibits further testing and a warning
beeper sounds for extra safety.
■ Large easy-to-read LCD using the patented Megger
digital/analogue arc technology - combining high speed
analogue clarity with digital stability. Making it easy to
read even in low light level.
■ Economical with batteries by incorporates an auto
shut off facility that operates after 5 minutes of inactivity,
reducing wasted battery consumption.
■ Innovative test lead connection has been developed
for the MFT1500 series. The unique shutter system
allows only those combinations of test leads permitted
for safe testing to be connected. Unsafe or unnecessary
options cannot be connected.
■ Rubber over-moulded case. The ergonomic rubber
moulding provides a secure comfortable hold, whilst
providing maximum protection with IP54 weather proof
rating.
■ Calibration certificate
■ 3 year warranty
MFT1502/2 Additional features
Illuminated switched probe shines a new light on
testing.
A fully featured test probe allows for single-handed
operation and test status indication. Probe features include:
■ Remote test button for single-handed testing in difficult
locations, the test button duplicates the instrument test