MEATEST
M133C Electric Power/Energy Calibrator
Operation manual
144
AC power (sine amplitude)
Summary range:
3x (0.005VA to 18 kVA (600 kVA with current coil option 140-50))
Frequency range:
15Hz to 1000 Hz
AC real power accuracy (%) for PF = 1.0 f = 40 – 70 Hz
Current
Voltage
10.0000 V
30.0000 V
70.000 V
140.000 V
280.000 V
600.000 V
100.000 mA
0.061
0.061
0.061
0.061
0.061
0.063
1.00000 A
0.044
0.044
0.044
0.044
0.044
0.047
5.00000 A
0.044
0.044
0.044
0.044
0.044
0.047
10.0000 A
0.052
0.052
0.052
0.052
0.052
0.055
30.0000 A
0.057
0.057
0.057
0.057
0.057
0.059
AC electric power accuracy (%) for PF = 0.8 f = 40 – 70 Hz
Current
Voltage
10.0000 V
30.0000 V
70.000 V
140.000 V
280.000 V
600.000 V
100.000 mA
0.067
0.067
0.067
0.067
0.067
0.069
1.00000 A
0.051
0.051
0.051
0.051
0.051
0.054
5.00000 A
0.051
0.051
0.051
0.051
0.051
0.054
10.0000 A
0.059
0.059
0.059
0.059
0.059
0.061
30.0000 A
0.087
0.087
0.087
0.087
0.087
0.088
AC electric power accuracy (%) for PF = 0.5 f = 40 – 70 Hz
Current
Voltage
10.0000 V
30.0000 V
70.000 V
140.000 V
280.000 V
600.000 V
100.000 mA
0.086
0.086
0.086
0.086
0.086
0.088
1.00000 A
0.075
0.075
0.075
0.075
0.075
0.077
5.00000 A
0.075
0.075
0.075
0.075
0.075
0.077
10.0000 A
0.080
0.080
0.080
0.080
0.080
0.082
30.0000 A
0.16
0.16
0.16
0.16
0.16
0.16
(Real) Power accuracy calculation:
dP
W
= √ ( dU
2
+ dI
2
+ dPF
2
+ 0.01
2
) (%)
Reactive Power accuracy calculation:
dP
VAR
= √ ( dU
2
+ dI
2
+ dPF
VAR
2
+ 0.01
2
) (%)
Apparent Power accuracy calculation:
dP
VA
= √ ( dU
2
+ dI
2
+ 0.01
2
) (%)
DC Power accuracy calculation:
dP
Wdc
= √ ( dU
2
+ dI
2
+ 0.01
2
) (%)
Where:
dPF = abs(100*(1 -cos (φ+dφ)/cos φ)) [%]
dPF
VAR
= abs(100* (1 -sin (φ+dφ)/sin φ)) [%]
φ is set phase [°]
dU is accuracy of set voltage [%]
dI is accuracy of set current [%]
dφ is accuracy of set phase [°]
Example1
(Real power accuracy calculation, U=230V, I=5A, φ=60°, f=50Hz):
dU = 0.015% + 0.01%*280/230 = 0.0272%
dI = 0.025% + 0.01%*5/5 = 0.035%
dPF = abs(100*(1-cos(60°+0.02°)/cos(60°))) = 0.0605%
dP
W
= √ (0.0272
2
+ 0.035
2
+ 0.0605
2
+ 0.01
2
)% =
0.076%
Example2
(Reactive power accuracy calculation, U=230V, I=5A, φ=60°, f=50Hz):
dU=0.015% + 0.01%*280/230 = 0.0272%
dI=0.025% + 0.01%*1/1 = 0.035%
dPF
VAR
= abs(100*(1-sin(60°+0.02°)/sin(60°))) = 0.0201%
dP
VAR
= √ (0.0272
2
+ 0.035
2
+ 0.0201
2
+ 0.01
2
)% =
0.050%
