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Basic and service errors for
Insulation and Resistance ranges.
The basic error is the maximum inaccuracy of the
instrument under ideal conditions, whereas the service
error is the maximum inaccuracy taking into effect of
battery voltage, temperature, interference, and system
voltage and frequency, where applicable. After
determining the service error, we can then calculate the
measurement range. This is the range of measurement
over which the error in service is less than 30% of the
reading. Digital instruments are affected by the number of
digits error – for example a value 0,10Ω measured with the
continuity range may give a display in the range 0,07Ω to
0,13Ω which is a maximum error of 30%. Therefore the
measurement range measuring low resistance is 0,10Ω to
99,9Ω. When checking that a measurement does not
exceed a limit, the service error needs to be taken into
account and these tables enable this to be done quickly
and easily. These will guarantee that the value being
measured is greater than or less than the limit value
specified as appropriate.
Insulation Resistance – MΩ
Limit Min. Indicated Reading Limit Min. Indicated Reading
0,10 0,14 2,00 2,12
0,20 0,25 3,00 3,16
0,30 0,35 4,00 4,20
0,40 0,46 5,00 5,24
0,50 0,56 10,00 10,8
0,60 0,66 20,00 21,2
0,70 0,77 30,00 31,6
0,80 0,87 40,00 42,0
0,90 0,98 50,00 52,4
1,00 1,08 100,00 94,0
Continuity Resistance – Ω
Limit Max. Indicated Reading Limit Max. Indicated Reading
0,10 0,06 2,00 1,88
0,20 0,15 3,00 2,84
0,30 0,25 4,00 3,80
0,40 0,34 5,00 4,76
0,50 0,44 10,00 9,56
0,60 0,54 20,00 18,8
0,70 0,63 30,00 28,4
0,80 0,73 40,00 38,0
0,90 0,82
50,00 47,6
1,00 0,92 100,00 92,0
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