Gossen MetraWatt 702 - Manual (Page 44)

44 GOSSEN METRAWATT GMBH
18 Appendix
18.1 Evaluation of Measured Values for Individual Measurements
as well as for Calculated Quantities
In order to assure that the limit values for the individual measurements
are always observed, device measuring error must be taken into
consideration.
The table in the appendix allows for calculation of the required minimum
display value for each respective measurement which must appear at the
instrument in consideration of measuring error (under nominal conditions
of use), in order to assure that the required limit value is not fallen short of
(DIN VDE 0413, part 1). Intermediate values can be interpolated.
Measuring Error for Test Sequences
The test instrument takes respective measuring error into consideration
during automatic test sequences, and corrected results are entered into
the test report, as long as this function has been activated in the setup
switch position under “include service error”.
Tables for the calculation of minimum display values for insulation
resistance and maximum display values for protective conductor
resistance, equivalent leakage current, probe current and residual
current in consideration of device measuring error:
1) Depending upon resolution
R
ISO
M
Ω
R
PE
Ω
Limit Value
Minimum
Display Value
Limit Value
Maximum
Display Value
0.100 0.115 0.100 0.085
0.250 0.273 0.200 0.180
0.500 0.535 0.300 0.275
1.000 1.060 0.400 0.370
2.000 2.200 0.500 0.465
5.000 5.350 0.600 0.560
7.000 7.450 0.700 0.655
10.00 10.60 or 12.5 1 0.800 0.750
20.00 23.00 0.900 0.845
75.00 83.50 1.000 0.940
1.100 1.035
I
EL
mA I
probe
mA I
RI
mA
Limit Value
Maximum
Display Value
Limit Value
Maximum
Display Value
Limit Value
Maximum
Display Value
1.00 0.85 0.100 0.085 0.25 0.12
3.50 3.23 0.250 0.227 0.50 0.35
7.00 6.55 0.500 0.465 1.00 0.80
10.00 9.40 1.000 0.940 2.00 1.70
15.00 14.15 2.000 1.890 3.50 3.05
20.00 18.90 3.500 3.315 5.00 4.40
7.00 6.20
10.00 8.90
15.00 13.40
20.00 17.90
25.00 22.40