General Specification; Applied Standards; Principles Of Measurement - Iso-Tech IMT-3300 Manuel D'instructions

3.2 General specification

Operating temperature and
humidity.
Storage temperature
andhumidity.
Battery type
Number of measurement per
battery set:
Dimensions:
Weight:
Maximum altitude:
Over range indication:
Input voltage greater than 260V
indication (Loop & RCD test):
Input voltage less than 100V
indication (Loop & RCD test):
Index of protection
Over temperature indication
Low battery indication
Test lead fuses (User
replaceable):
Distribution board test lead
fuses:
UK mains lead fuse:
Instrument internal fuse:
0 to 40° C, 80% RH or less,
no condensation.
- 10 to +50° C, 75% RH or
less, no condensation.
Qty 8 x AA R6 or LR6 Alkaline
cells
Approx. 700 continuity, or
1000 insulation resistance
measurements.
175 x 115 x 85.7mm
780g including batteries
2000m
'OL'
'V-PE Hi'
'V-PE Lo'
IP 50
F10A/600V, HBC
ceramic11/4 x 1/4 " (32 x
6.35 mm)
13A 1 x 1/4 " (25 x 6.35
mm) to BS1362
F500mA/600V, HBC ceramic
11/4 x 1/4" (32 x 6.35mm)

3.3 Applied standards

Operating: IEC/EN61557-1,3,6,10(1997)
Safety: Instrument: IEC EN 61010-1 (2001), CATIII
300V, Pollution degree 2Test lead: IEC EN
61010-031 (2002), CATIII 300V
Protection: IEC 60529 (1989 + A1) IP40
EMC: EN 55022: 1998+A1+A2EN61000-4-
2:1995+A1+A2EN61000-4-3: 1996+A1+A2
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.

4 Principles of measurement

The ISO-TECH IMT-3300 Continuity, Insulation, Loop and RCD
Tester performs four electrical functions. Each function has its
own measurement principle as follows:
4.1 Continuity
As a continuity tester the instrument can be used to measure
low values of 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.
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