M-142 Multifunction Calibrator
MEATEST, s.r.o.
116
User Manual v54
DCV uncertainty
See table of DCV uncertainty.
DCI uncertainty
Range
% value + μA
Max. compliance voltage [V]
2.00000 mA – 20.00000 mA
0.05 + 2
3
20.0000 mA – 200.0000 mA
0.05 + 10
3
0.200000 A – 2.000000 A
0.05 + 100
3
2.00000 A – 20.00000 A
*1
0.05 + 2000
1.5
*1
Continuous current in range below 10 A. In range 10 to 20 A limited time to 30 s.
DC POWER uncertainty
Uncertainty of DC power can be calculated from the following formula:
d P =
( dU
2
+ dI
2
+ 0.01
2
) [%]
where
dP is uncertainty of output power
[%]
dU is uncertainty of set voltage
[%]
dI is uncertainty of set current
[%]
DC ENERGY uncertainty
Depends on voltage, current, time values. The best uncertainty is 0.016 %.
ACV uncertainty
See table of ACV uncertainty.
ACI uncertainty
Range
% value + μA
Max. compliance voltage [V]
2.00000 mA – 20.00000 mA
0.05 + 2
3
20.0000 mA – 200.0000 mA
0.05 + 10
3
0.200000 A – 2.000000 A
0.05 + 100
3
2.00000 A – 20.00000 A
*1
0.05 + 2000
1.5
*1
Continuous current in range below 10 A. In range 10 to 20 A limited time to 30 s.
PHASE uncertainty
Frequency range [Hz]
Phase accuracy d
[
]
40.000 – 200.000
0.15
200.001 – 400.000
0.25
AC POWER uncertainty
Uncertainty of AC power can be calculated from the following formula:
for active power
d P =
( dU
2
+ dI
2
+ dPF
2
+ 0.03
2
) [%]
for reactive power
d P =
( dU
2
+ dI
2
+ dPF*
2
+ 0.03
2
) [%]
for apparent power
d P =
( dU
2
+ dI
2
+ 0.03
2
)
[%]
where
dP is uncertainty of power
[%]
dU is uncertainty of set voltage
[%]
dI is uncertainty of set current
[%]
dPF is uncertainty of power factor (cos
)
[%]
For calculation of dPF is valid following formula:
dPF = (1 – cos (
+d
)/cos
) * 100
[%]
where
is set phase shift between voltage and current outputs
d
is uncertainty of set phase shift in table above
dPF* is uncertainty of of sin
[%]
For dPF* is valid following formula:
dPF* = (1 – sin (
+d
)/sin
) * 100
[%]
