CT Analyzer User Manual
164
10.4 Winding Resistance Measurement Accuracy
10.5 Ratio and Phase Measurement Accuracy
The values given in the following table are only valid under the following
conditions:
• All utility lines to the primary side of the CT are disconnected.
• One terminal of the primary side of the CT is connected to PE.
• The original measurement cables delivered by OMICRON for the
CT Analyzer are used.
• The CT under test is a CT with a non-gapped core.
• The knee point voltage according to IEEE C57.13 is > 3V.
Under interfering conditions the device has reduced accuracy.
Input impedance
0 - 15V: 1M
Ω
15 - 150V: 500kΩ to 1MΩ, depending on the
voltage. Input current is compensated by the
device.
Insulation Reinforced insulation (R) to all other circuits
Measurement input "Prim"
Voltage ranges 0 - 0.03 / 0.3 / 3 / 30V
AC
(auto ranging)
Accuracy 0.1% (guaranteed)
Input impedance
0 - 15V: 330k
Ω
15 - 30V: 120kΩ to 330kΩ, depending on the
voltage.
Insulation Reinforced insulation (R) to all other circuits
Measurement input "Sec"
Winding resistance measurement accuracy
Resolution
1m
Ω
Accuracy 0.05% (typical)
0.1% + 1m
Ω (guaranteed)
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