METREL CS 2890, Инструкция по эксплуатации, Страница: 66 / 96

CS 2890 Power Simulator / Calibrator Operating the instrument
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6.1.5 Calibration of current inputs for Class S PQA (MI 2883 example)
Reference

value from the CS 2890
UUC

indicated value on the calibration item (MI 2883)
Uncertainty

expanded measurement uncertainty (k=2)
Error

UUC
– Reference
Limit

limit of error (
±), for MI 2883 ±0.5%
UUC set-up: Voltage ratio 1:1, Connection: 4W, Synchronisation: I1, System frequency:
50 Hz, Primary current: 5A, Secondary current: 5A
Reference Frequency UUC Uncertainty Error Limit
Range=100A
Input mV Hz A A A A
I1 50 50 49.96 0.04 0.04 0.25

I2 50 50 50.02 0.04 -0.02 0.25

I3 50 50 50.04 0.04 -0.04 0.25

N 50 50 50.12 0.04 -0.12 0.25


I1 100 50 99.94 0.07 0.06 0.50

I2 100 50 99.93 0.07 0.07 0.50

I3 100 50 100.0 0.07 0 0.50

N 100 50 100.1 0.07 -0.1 0.50


I1 200 50 199.9 0.15 0.1 1.0

I2 200 50 199.8 0.15 0.2 1.0

I3 200 50 200.0 0.15 0 1.0

N 200 50 200.1 0.15 -0.1 1.0


Range=1000A
I1 50 50 49.97 0.04 0.03 0.25

I2 50 50 50.01 0.04 -0.01 0.25

I3 50 50 50.03 0.04 -0.03 0.25

N 50 50 50.13 0.04 -0.13 0.25


I1 1000 50 1000.0 0.7 0 5.0

I2 1000 50 999.9 0.7 0.1 5.0

I3 1000 50 1000.0 0.7 0 5.0

N 1000 50 1001.0 0.7 -1 5.0


I1 2000 50 2001 1.40 -1 10

I2 2000 50 2000 1.40 0 10

I3 2000 50 2000 1.40 0 10

N 2000 50 2001 1.40 -1 10

Table 40: MI 2883 current calibration performed with CS 2890 (Uncertainty based
on Calibration certificate)