Vt Ratio Measurement - Omicron CT SB2 User Manual

10.7

VT ratio measurement

This is a predefined measurement type, intended especially for the quick
measurement of VT ratios.
Note: This is not a complete VT test. This measurement only determines the
voltage ratio of VTs.
To select the VT Ratio measurement type, use the
cursor to the Measurement Type field in the CT-Quick card and then press the
VT Ratio soft key.
Figure 10-11: CT-Quick card and Results card for VT ratio measurement
For the VT Ratio measurement type, the CT-Quick card holds the following measurement quantities:
Table 10-9: Parameters for VT Ratio measurement type
Parameter Description
Output The output signal type is fixed to "AC".
U/I Operating mode of the internal signal generator: voltage or current source. Fixed to
"Voltage".
Amplitude RMS voltage of the output signal. Adjustable by the user.
Possible values: 0 to 40V.
Default: 1.00V.
f Frequency of the output signal. Adjustable by the user.
Possible values: 5.0 to 400.0Hz or soft keys 16.7Hz, 50Hz, 60Hz or 400Hz.
Default: 50Hz
The following values are displayed in the Results VT Ratio card:
Table 10-10: Values displayed for VT Ratio measurement type
Value Description
OUTPUT Internally measured RMS current value and phase of the output signal.
SEC RMS value of the voltage measured at input SEC.
This input is considered as the phase reference, therefore the phase is always 0.
PRIM RMS value and phase of the voltage measured at input PRIM.
N Voltage ratio of the VT calculated from the voltages measured at inputs SEC and PRIM.
f Frequency measured at input SEC.
OMICRON
Using the Quick Test feature
cursor key to move the
How to get there:
Press the Main soft key in
any test card
Main Menu:
- New Quick-Test
OK soft key
CT-Quick card:
Measurement Type:
VT Ratio
157