Sonel MPI-520 User Manual

MPI-520 – USER MANUAL
62
10.2.4 Additional uncertainties according to IEC 61557-5 (R
E
)
Significant parameter
Designation
Additional uncertainty
Position
E
1
0%
Supply voltage
E
2
0% (BAT is not lit)
Temperature 0...35°C
E
3
±0.25 digit/°C for 50 V
±0.33 digit/°C for 25 V
Serial interference voltage
E
4
1%, generally according to the be-
low formulas
Resistance of electrodes
E
5
2% generally according to the be-
low formulas and the diagram
Frequency 99%..101%
E
7
0%
Network voltage 85%..110%
E
8
0%
Additional uncertainty caused by serial interference voltage
R
E
Additional uncertainty [Ω]
0.00...9.99 Ω
±((0.01R
E
+ 0.012)U
Z
+ 0.003 U
Z
2
)
10.0...99.9 Ω
±((0.001R
E
+ 0.05)U
Z
+ 0.001 U
Z
2
)
100 Ω...1.99 kΩ
±((0.001R
E
+ 0.5)U
Z
+ 0.001 U
Z
2
)
Additional uncertainty caused by resistance of electrodes:
 
%105,1
004,0
150
100000
28














H
E
H
S
S
dod
R
R
R
R
R

R
S
< 5 k
 
%105,1
004,0
5,7
28












H
E
H
dod
R
R
R

R
S
≥ 5 k
Resistance of voltage electrode Rs[Ω]
Additional error ca
used by resistance of electrodes [%]
R
H
Current electrode resistance
R
E
Resistance to earth
=

Sonel MPI-520 Specifications

General

Brand	Sonel
Model	MPI-520
Category	Measuring Instruments
Language	English