KYORITSU 5410 - Manual (Page 9)

● Operating error
Operating error (B) is an error obtained under the nominal operating
conditions, and calculated with the intrinsic error (A), which is an error
of the instrument used, and the error (En) due to variations.
B = ± ( |A| + 1.15 x √E
1
² + E
2
² + E
3
² + E
5
²+ E
8
² )
A : Intrinsic error
E
1
: Variation due to changing the position
E
2
: Variation due to changing the supply voltage
E
3
: Variation due to temperature
E
5
: Variation due to the resistance of Probe *
E
8
: Influence by the variation in System Voltage
*Probe = auxiliary Earth electrode to be used for the
sampling of electric potentials during measurements
IΔn Probe resistance
15mA Less than 200Ω
30mA Less than 100Ω
50/100/200/500mA Less than 20Ω
KEW5410 Max Operating Error (IEC61557)
Range Max Operating Error
test current 0% ~ +10%
x 5
time measurement ±10%
test current 0% ~ +10%
x 1
time measurement ±10%
x 1/2 test current -10% ~ 0%
AUTO RAMP (mA) ±6%
7