KYORITSU 4300 - Manual (Page 9)

̶ 7 ̶
● Operating Error
Operating error (B) is an error obtained within the rated operating
conditions, and calculated with the intrinsic error (A), which is an
error of the instrument used, and the error (Ei) due to variations.
According to IEC61557, the maximum operating error should be
within ±30%.
● Operating error at earth resistance measurements (IEC61557-5)
Formula: B= ±(|A|+1.15 x √E
2
2 +E
3
2 +E
4
2 )
A Reference condition
E
1
Normal operating position ±90º
E
2
Variation due to changing the supply voltage (until the
Battery symbol appears)
E
3
Variation due to changing the temperature
(-10ºC to 50ºC)
E
4
Variation due to series interference voltage
16•2/3Hz, 50Hz, 60Hz, DC: 10V
400Hz: 3V
E
5
Variation due to resistance of the probes and auxiliary
earth electrode resistance
E
1
: It is not applicable to digital testers.
E
5
: It is not applicable to simplified earth testers.
Measurement range within which the maximum operating error
±30% applies: 5.00Ω to 2000Ω.
● Number of measurement
(measuring for 5 sec and take a pause for 25 sec)
Function Resistor
for test
Number of measurement
(within effective battery voltage
range)
Earth measurement 10Ω Approx. 3000 times