Seaward Checkbox 17 Plus - Manual (Page 2)

READ INSTRUCTIONS BEFORE USE
Due to the potential hazards associated with any electrical circuit it is
important that a user is fully familiar with the instructions covering the
capabilities, applications and operations of the instrument.
The user should ensure that all reasonable safety procedures are
followed and if any doubt exists should seek advice before proceeding.
INTRODUCTION
The CheckBox 17 Plus is a versatile compact instrument that is designed
to provide a convenient checkpoint for installation test instruments
including Phase Earth Loop Testers, Insulation Continuity Testers and
RCD Testers.
Unless a user has confidence in his instrumentation they are of little value
and the results generated are of little use. Under laboratory conditions it
is often possible to cross-reference between instruments and confirm
readings, however installation and contracting instruments are often used
in the field and this option is rarely available.
The CheckBox 17 Plus is not designed to be the basis of a complete
calibration system but it does offer precision test points for a wide variety
of instruments and enables the user to confirm the accuracy of his
equipment whenever required. By returning the CheckBox 17 Plus at
regular intervals for calibration ([email protected]) one can
avoid the need to return instruments for calibration at unnecessarily
frequent intervals, thus saving cost and increasing their availability.
LAYOUT
The Check Box provides six test functions including resistance,
insulation, AC Voltage, phase earth loop resistance and RCD testing.
A fuse socket is located at the lower end of the CheckBox 17 Plus and
the instrument should be connected to a suitable 230V supply for RCD,
Phase Earth Loop and voltage tests.
A 13A 3pin socket outlet is located at the lower end of the display panel
for RCD testing and Phase Earth Loop testing.
Resistance check points for continuity are located at the top of the
display panel and precision 1 Ohm and 10 Ohm test points are provided.
Insulation resistance of 1M ohm and AC voltage are also provided on the
instrument facia.
A momentary action rocker switch, marked LOOP and LOOP+5R,
provides test values for phase earth loop linearity tests.
OPERATION
Note: Connection to 230V mains supply is not necessary for insulation
and continuity checking.
Resistance/Continuity Check
Connect the ohm meter/continuity tester to the 1 ohm and 10 ohm test
points in turn, note the readings obtained. Short the instrument test leads
together and note the resistance reading. Deduct the lead resistance
from the 1 ohm and 10 ohm reading and compare to the calibrated value
on the CheckBox 17 Plus Certificate of Test.
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