Megger MFT1700 series User manual

M
MFT1700/1800 Series
Multifunction Tester
Quick Start Guide
GSAFETY WARNINGS
n Safety warnings and precautions must be read and understood before
the instrument is used. They must be observed during use.
n The circuit under test must be switched off, de-energised and isolated
before test connections are made when carrying out insulation and
continuity tests.
n Continuity of protective conductors and earthed equipotential bonding
of new or modified installations must be verified before carrying out an
earth fault loop impedance test, RCD or earth testing
n Do not touch circuit connections and exposed metalwork of an
installation or equipment under test. Under fault conditions the system
earth could become hazardous live.
n Do not touch the earth stakes, test leads and their terminations
(including connections to the earthing system under test) if an
installation earth fault can arise unless adequate precautions are taken.
n The ‘live circuit warning’ and ‘Automatic discharge’ functions are
additional safety features and should not be regarded as a substitute
for normal safe working practices.
n Do not move the rotary switch positions while a test is in progress.
n Do not operate the instrument or connect it to any external system
if it shows any visible signs of damage or if it has been stored for
prolonged periods in unfavourable conditions.
n Do not operate the instrument or connect it to any external system
if the battery compartment or casing is open or any parts of the case
(including keypad, selector switch, display window, etc.) are missing.
n Always disconnect the instrument from all systems while batteries are
being changed or the fuse replaced
n Do not replace the rechargeable cells in the MFT1730 and 1835 with
non-rechargeable “dry” cells and attempt to charge the cells. This can
cause explosion or fire.
n Do not operate the charging equipment supplied with the MFT1730 or
MFT1835 in damp or wet environments or outside. All test leads must
be removed from the instrument while charging.
n After insulation tests, capacitive circuits must be allowed to discharge
before disconnecting test leads. Locking the Insulation test ON should
only be used where there is no risk of a circuit holding a charge.

n The instrument should not be used if any part of it is damaged.
n Test leads, probes and crocodile clips must be in good order, clean and
with no broken or cracked insulation.
n All test leads supplied with the instrument form part of the measuring
circuit of the instrument. They must not be modified or changed in any
way, or be used with any other electrical instrument or appliance.
n A plug severed from the power cord MUST be destroyed, as a plug with
bare conductors is hazardous in a live socket outlet.
n Ensure that hands remain behind guards of probes/clips when testing.
n U.K. Safety Authorities recommend the use of fused test leads when
measuring voltage on high energy systems.
n Replacement fuses must be of the correct type and rating.
n Failure to fit the correctly rated fuse will result in damage to the
instrument in the event of an overload.
n Special precautions are necessary when operating in situations where
“live” earths may be encountered: isolation switches and fuses (not
supplied with this instrument) must be used.
n Special precautions are necessary when working near high tension
systems (MV and HV): rubber gloves and shoes (not supplied with this
instrument) should be worn.
n Special precautions are necessary when working in wet conditions or
in agricultural areas: observe the local safety standards and take all
necessary special precautions applicable to the particular location and
do not touch the test leads with bare hands.
LIVE EARTH SAFETY PRECAUTIONS
n A ‘Live’ earth is one that carries current from the mains supply, or could
do so under fault conditions. The following warnings apply in addition
to those listed previously.
n All persons involved must be trained and competent in isolation and
safety procedures for the system to be worked on. They must be clearly
instructed not to touch the earth electrode, test stakes, test leads, or their
terminations if any ‘Live’ earths may be encountered. It is recommended
that they wear appropriate rubber gloves, rubber soled shoes, and stand
on a rubber mat.
n The earth electrode under test should be isolated from the circuit it
is protecting before testing commences. If this is not possible, ART
(attached Rod Technique) may be used to measure electrode resistance.
n The instrument terminals should be connected to the system under test
through isolation switches that are rated to handle the likely maximum
fault voltages and currents that could be encountered at the installation.
The isolation switch must be open whilst any personal contact is made
with the remote test stakes, or the connecting leads, e.g. when changing
their position.
n The instrument terminals should be connected to the system under test
through fuses that are rated to handle the likely maximum fault voltages
and currents that could be encountered at the installation.

NOTE
THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED
AND COMPETENT PERSONS
Users of this equipment and/or their employers are reminded that Health
and Safety Legislation requires them to carry out valid risk assessments of all
electrical work so as to identify potential sources of electrical danger and risk
of electrical injury such as inadvertent short circuits . Where the assessments
show that the risk is significant then the use of fused test leads constructed
in accordance with the HSE guidance not GS38 ‘Electrical Test Equipment
for use by Electricians ‘ should be used .
This instrument is internally protected against electrical damage when used
for the purposes of testing low voltage electrical installations as defined
herein. If used in a manor other than those defined in this user guide the
protection capabilities could be impaired with potential risk to the operator
and the instrument.
Symbols used on the instrument are:
G Caution: refer to accompanying notes
Maximum nominal system voltage of 600 V
c Equipment complies with current EU directives
Equipment complies with ‘C tick’ requirements
Maximum 300 V a.c. CAT IV to earth
Instrument protected by 2 x F2A 600 V 50 kA fuses
This equipment should be recycled as electronic waste
12 Vdc charger socket
Instrument overview
Display layout
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Test button (left)
lead null set
Function
button
Test lock
Result save
Bluetooth® transfer
Display
backlight
Secondary
functions
Primary
functions
Test button (right)
Lead null set
UP selector
Test lock
Down selector
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Touch
voltage
limit
Analogue arc
Function
indicators
Battery status
NiMH or Alkaline
Secondary display
Primary results
display + Phase
Rotation

Terminal panel
Voltage/Frequency/Phase Rotation [V, Hz, ROT]
MEASUREMENT: Automatic. Large display shows Volts AC, small
display shows frequency
Phase rotation: L1 : L2 : L3 = Normal L1 : L3 : L2 = Reversed
Warnings: Maximum voltage range 600 Vac
SETUP options: NONE
Continuity measurement [Ω] - Measures
resistance of conductors
MEASUREMENT: Automatic on connection. Large display shows
resistance, small display shows test current.
Lead Null: To null leads, connect test leads together and press
TEST. Null indicator appears. To remove, Open
circuit leads and press TEST.
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Main
range
knob
(left)
2nd
range
knob
Terminal
connections
Separate
leads
Mains lead
connections
User
action
Volts/Hz
Not used None
ROT
Not used Not suitable Press
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L-E
Main
range
knob
(left)
2nd
range
knob
Terminal
connections
Separate
leads
Mains lead
connections
User
action
Not used
Auto-
matic
on
contact
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L-N
L-E
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Functions:
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Buzzer ON/OFF
Buzzer threshold: Buzzer sounds below 2 Ω. To change limit go to
SETUP
Warnings: Live circuit test inhibit at 3 V
SETUP options:
Test current: 200 mA / 15 mA
Auto reverse testing: On/Off
Continuity buzzer threshold: 0.5 Ω, 1 Ω, 2 Ω, 5 Ω, 10 Ω, 20 Ω, 50 Ω and
100 Ω
Insulation measurement [MΩ]
MEASUREMENT: Press TEST to start. Keep pressed until measurement
stabilises.
Release TEST button to discharge circuit.
Test Lock: Hold down TEST button and press LOCK. To release
press TEST.
Functions:
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Insulation “Pass threshold” buzzer ON/OFF
Buzzer threshold: Sounds above 0.5 MΩ, adjustable in SETUP.
Warnings: Ensure circuit to be tested is disconnected and
isolated.
Live circuit warning at 25 V or 50 V (Default 50 V)
SETUP options: Insulation buzzer threshold: 0.5 MΩ, 1 MΩ, 2 MΩ,
3 MΩ, 4 MΩ, 5 MΩ, 7 MΩ, 10 MΩ, 50 MΩ, 100 MΩ,
500 MΩ (Default 0.5 MΩ)
RCD testing [ms] – Measures trip times of RCD
Main
range
knob
(left)
2nd
range
knob
Terminal
connections
Separate
leads
Mains lead
connections
User
action
250 V – 500 V
MFT1710
Not used
Press
and
hold
TEST
button
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L-N
L-E
Main
range
knob
(left)
2nd range
knob
Terminal
connections
Separate
leads
Mains lead
connections
User
action
30 mA – 500 mA
MFT1710
See note See note See note
Press
TEST
button
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Note: Third lead can be connected. The third lead will enable reverse
polarity detection.
MEASUREMENT: Press and release TEST button.
Supply: L-E = 90 Vac - 280 Vac L1(in) -L2(out) = 90 Vac –
480 Vac (Phase - Phase)
Functions:
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0º and 180º (Quick press), Type AC, A, S, B
selection (Press and hold)
RCD
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1700 series run 1/2xI, 1xI(0º), 1xI(180º), 5xI(0º),
5xI(180º) automatically.
1800 series run 1/2xI, 1xI(0º), 1xI(180º), 2xI(0º),
2xI(180º) & 5xI(0º), 5xI(180º)
RCD
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Adjustable RCD trip current. Use
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and
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to
adjust current.
Warnings: Touch voltage >50 V
SETUP options: Touch voltage 25 V, 50 V (Default 50 V)
RCD ramp testing [mA] – Measures trip current of RCD
Note: Third lead can be connected. The third lead will enable polarity
detection.
MEASUREMENT: Press and release TEST button.
Functions:
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Fast Ramp - Pass/Fail test between 50% and
100% of range
Slow Ramp – Displays trip current in mA
Warnings: Touch voltage >50 V
Reverse polarity
SETUP options: Touch voltage 25 V, 50 V (Default 50 V)
Main
range
knob
2nd Range
knob
Terminal
connections
Separate
leads
Mains lead
connections
User
Action
Press
TEST
button
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Loop impedance testing [mA] – Measures circuit loop
impedance
Note: Third lead can be connected. The third lead will enable reverse
polarity detection
MEASUREMENT: Press TEST to start. L-E tests start automatically.
Supply: L-E = 50 Vac - 280 Vac
L-L, L-N = 50 Vac – 480 Vac
Zmax:
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Stores maximum loop measurements on small
display and most recent loop measurement on
larger display
Warnings: Over voltage
Reverse polarity (with mains plug test lead)
SETUP options: Auto start on connection ON/OFF
Note: Third lead can be connected. The third lead will enable polarity
detection.
Loop impedance R1+R2 testing [mA]
MEASUREMENT: Select Zref and make measurement at Ze (or Zdb).
This is automatically saved.
Zref & R1+R2 Select R1+R2 mode and make measurement as
normal (Zs).
Zref automatically deducted from Loop (Zs) value
to give R1+R2 value.
Main
range
knob
(left)
2nd Range
knob
(right)
Terminal
connections
Separate
leads
Mains lead
connections
User
Action
NOT 1710
See note See note See note
NONE
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Main
range
knob
(left)
2nd Range
knob
(right
Terminal
connections
Separate
leads
Mains lead
connections
User
Action
then
See note See note See note
NONE
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Loop impedance R1+R2 testing [mA]
MEASUREMENT: Press TEST to start.
Warnings: Over voltage
SETUP options: None
Megger Limited
Archcliffe Road
Dover T + 44 (0) 1304 502100
Kent, CT17 9EN F + 44 (0) 1304 207342
England
E [email protected]
Megger
4271 Bronze Way T [phone] (U.S.A. only)
Dallas T [phone] (International)
TX 75237-1019 F [phone]
U.S.A.
E [email protected]
Megger
Z.A. Du Buisson de la Couldre
23 rue Eugène Henaff T +33 (0) 1 30.16.08.90
78190 TRAPPES F +33 (0) 1 34.61.23.77
France
E [email protected]
Megger Pty Limited
Unit 26 9 Hudson Avenue
Castle Hill T [phone]
Sydney NSW 2125 F [phone]
Australia
E [email protected]
Megger Limited T [phone] (Canada only)
110 Milner Avenue Unit 1 T [phone]
Scarborough Ontario M1S 3R2 F [phone]
Canada
E [email protected]
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 2001-711- Edition V01 - Printed in England - 0211
www.megger.
Main
range
knob
2nd Range
knob
Terminal
connections
Separate leads User
Action
Not used Press and
release
TEST button
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