Omicron Lab CT Analyzer - Winding Resistance Measurement Accuracy; Ratio and Phase Measurement Accuracy

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)