3.4.2 Accuracy
The specifications given in this section are valid for single-channel current output. When using the
parallel output configuration (1 x 37.5 A), the errors of the individual channels have to be added.
The phase and amplitude accuracy of the current amplifier depends on the connected burden. For
higher burdens, the influence of the output impedance needs to be considered.
Unless stated otherwise, the specification is valid within the following limits:
Range Calibration burden Burden range
1.25 A 0.5 Ω 0 ... 1 Ω
12.5 A 0.25 Ω 0 ... 0.5 Ω
Amplitude accuracy
The 24-hour stability specifications apply for a stable burden. In order to obtain the specified amplitude
accuracy at currents below 6 A, the amplifier has to cool down for at least 90 seconds after the output
of currents above 6 A.
Range Frequency Accuracy
±(% of set value + % of range)
Temperature coefficient
±(% of set value + % of rg.)/°C
beyond 23 °C ± 5 °C
24 hours 1 year 2 years
1.25 A 50/60 Hz 0.02 + 0.005 0.04 + 0.01 0.07 + 0.01 0.0015 + 0
10 Hz ... 100 Hz - 0.04 + 0.01 0.07 + 0.01
100 Hz ... 1 kHz - 0.25 + 0.01 0.23 + 0.01
DC - 0.04 + 0.015 0.07 + 0.015 0.0015 + 0.0050
12.5 A
(I
set
≤ 6 A)
50/60 Hz 0.02 + 0.005 0.04 + 0.01 0.07 + 0.01 0.0015 + 0
10 Hz ... 100 Hz - 0.04 + 0.01 0.07 + 0.01
12.5 A 10 Hz ... 100 Hz - 0.08 + 0.01 0.11 + 0.01
100 Hz ... 1 kHz - 0.35 + 0.01 0.38 + 0.01
DC - 0.08 + 0.015 0.11 + 0.015 0.0015 + 0.0005
Note: If the test object evaluates AC and DC components, the offset needs to be considered in the
RMS value. The offset is calculated from the DC specification with a set value of zero. The effect is
negligible for currents higher than 1 % of the output range.
CMC 430 User Manual
20
OMICRON
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