199.9
W
with auto range at 15
W
and with resolutions of 0.01 and
0.1
W
. The Ipsc is measured over one range of 19.99 kA with a
resolution of 0.01kA.
Three measurement modes, selected by the function switch,
enable loop measurements to be made between the phase and
earth conductor in the mains lead and prospective short circuit
current measurements between the phase and neutral conductors
in the mains lead. A reading is initiated and displayed when the
test button is depressed. The lamps indicate the status of the
phase neutral and phase earth conductors and the status of those
lamps can be interpreted to determine the absence of a conductor
or the reversal of two conductors (See Wiring Fault Diagnosis
Table Page
8
). Fuse protection is provided by a 5A, anti-surge
fuse fitted on the printed circuit board and a 13A fuse in the
plug. Thermal overload protection is provided by inhibiting tests
for a ten second period after any test, thus preventing overheating
of the internal circuitry.
The principal of operation of the tester is that a voltage
proportional to the incoming supply on no load is compared to
that same voltage when a 10
W
load is connected for two half
cycles of the mains supply. These signals are combined and fed
to a digital voltmeter LSI device whose output provides a reading
of the loop resistance or Ipsc. This device has a hold facility so
that after 1 second, the reading is retained for as long as the test
button is depressed. If there is a perturbation on the incoming
supply during the measurement cycle, the reading could be
inaccurate. It is, therefore, recommended that at least two
repeatable readings are obtained.
199.9
W
with auto range at 15
W
and with resolutions of 0.01 and
0.1
W
. The Ipsc is measured over one range of 19.99 kA with a
resolution of 0.01kA.
Three measurement modes, selected by the function switch,
enable loop measurements to be made between the phase and
earth conductor in the mains lead and prospective short circuit
current measurements between the phase and neutral conductors
in the mains lead. A reading is initiated and displayed when the
test button is depressed. The lamps indicate the status of the
phase neutral and phase earth conductors and the status of those
lamps can be interpreted to determine the absence of a conductor
or the reversal of two conductors (See Wiring Fault Diagnosis
Table Page
8
). Fuse protection is provided by a 5A, anti-surge
fuse fitted on the printed circuit board and a 13A fuse in the
plug. Thermal overload protection is provided by inhibiting tests
for a ten second period after any test, thus preventing
overheating of the internal circuitry.
The principal of operation of the tester is that a voltage
proportional to the incoming supply on no load is compared to
that same voltage when a 10
W
load is connected for two half
cycles of the mains supply. These signals are combined and fed
to a digital voltmeter LSI device whose output provides a reading
of the loop resistance or Ipsc. This device has a hold facility so
that after 1 second, the reading is retained for as long as the test
button is depressed. If there is a perturbation on the incoming
supply during the measurement cycle, the reading could be
inaccurate. It is, therefore, recommended that at least two
repeatable readings are obtained.
8.
LIMITED WARRANTY
Martindale Electric Co Ltd warrant instruments and test
equipment manufactured by them to be free from defective
material or factory workmanship and agree to repair or replace
such products which, under normal use and service, disclose
the defect to be the fault of our manufacturing, with no charge
for parts and service. If we are unable to repair or replace the
product, we will make a refund of the purchase price. Consult
the Instruction Manual for instructions regarding the proper
use and servicing of instruments and test equipment. Our
obligation under this warranty is limited to repairing, replacing
or making refund of any instrument or test equipment which
proves to be defective within
24
months from the date of
original purchase.
This warranty does not apply to any of our products which
have been repaired or altered by unauthorised persons in any
way so as, in our sole judgement, to injure their stability or
reliability, or which have been subject to misuse, abuse,
misapplication, negligence or accident or which have had the
serial numbers altered, defaced or removed. Accessories, not of
our manufacture used with this product, are not covered by this
warranty.
To register a claim under the provisions of this warranty, return
the instrument or test equipment to Martindale Electric Co Ltd,
Metrohm House, Penfold Trading Estate, Imperial Way,
Watford, WD24 4YY. Upon our receipt and inspection of the
product we will advise you as to the disposition of your claim.
8.
LIMITED WARRANTY
Martindale Electric Co Ltd warrant instruments and test
equipment manufactured by them to be free from defective
material or factory workmanship and agree to repair or replace
such products which, under normal use and service, disclose
the defect to be the fault of our manufacturing, with no charge
for parts and service. If we are unable to repair or replace the
product, we will make a refund of the purchase price. Consult
the Instruction Manual for instructions regarding the proper
use and servicing of instruments and test equipment. Our
obligation under this warranty is limited to repairing, replacing
or making refund of any instrument or test equipment which
proves to be defective within
24
months from the date of
original purchase.
This warranty does not apply to any of our products which
have been repaired or altered by unauthorised persons in any
way so as, in our sole judgement, to injure their stability or
reliability, or which have been subject to misuse, abuse,
misapplication, negligence or accident or which have had the
serial numbers altered, defaced or removed. Accessories, not of
our manufacture used with this product, are not covered by this
warranty.
To register a claim under the provisions of this warranty, return
the instrument or test equipment to Martindale Electric Co Ltd,
Metrohm House, Penfold Trading Estate, Imperial Way,
Watford, WD24 4YY. Upon our receipt and inspection of the
product we will advise you as to the disposition of your claim.
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