Principles Of Measurement - Iso-Tech IIT-2302 Manual De Instrucciones

Storage relative humidity: 85% maximum
Index of protection; IP40
Power supply: Qty. 6 X 1.5V AA Alkaline batteries,
type R6 or equivalent Fuse (user
replaceable): 500mA/600V, 1
high-breaking capacity, ceramic.
Weight (minus batteries): 538g
Possible number of operations during battery life:
When the following resistance is connected to a measuring
terminal alternating between 5 seconds loading and intervals of
25 seconds, the number of measurements that it is possible to
make, until the battery voltage falls 7.0V shall be:
250V Range 0.25MΩ approx.1200 times or more
500V Range 0.5MΩ approx.1200 times or more
1000V Range 1MΩ approx. 400 times or more
20Ω Range 1Ω approx. 300 times or more
Applied standards
Operation: EN 61557-1/2/4
Safety: EN61010 Cat.III 300V, Pollution degree 2
Protection: IEC60529
EMC: IEC 801 & EN 55022
Accessories: Test-leads, Crocodile-clips, Test-lead pouch,
Carrying strap and Instructions.
Note: Measurement Category lll is for measurements
per formed in the building installation. Examples are
measurements on distribution boards, circuit breakers, wiring
including cables, bus-bars, junction boxes, socket outlets and
permanently connected equipment in the fixed installation.
" (32 x 6.35 mm) fast acting,

4 Principles of Measurement

The ISO-TECH IIT-2302 Insulation and Continuity Tester
performs two basic electrical functions. As a continuity
tester the instrument can be used to measure low values of
x resistance between two points in an electrical circuit. In this
mode, the instrument acts as a low voltage current source.
The resistance is calculated from the measurement of voltage
across and the current through the conductor and displayed
directly on the meter. To avoid measurement errors, ensure the
instrument has a good low impedance connection to the circuit
under test. Circuits connected in parallel with the circuit under
test may affect the accuracy of measurements.
When used as an insulation tester, the instrument is configured
to measure high values of resistance and hence the electrical
quality of the insulating material within the circuit. The
insulation tester applies a high voltage, measures the total
leakage current flow and displays the calculated resistance.
A DC voltage is used to eliminate leakage currents caused
by capacitance in the circuit. A steady insulation resistance
reading will indicate that any capacitance within the system is
fully charged and the capacitive leakage current has reduced
to zero. Insulation resistance measurement errors may be due
to the circuit under test being wet and/or dirty. Errors may
also occur when testing large installations where the insulation
resistances may effectively be in parallel.
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