14
Operation
calibration is performed on the instrument for each of the additional
transformers. When the user selects the appropriate configuration,
the factory-stored calibration constants are automatically applied. If
a current transformer other than one supplied with the unit is used, a
calibration error or performance problem may result. For best
results, always use current transformers supplied by Arbiter
Systems.
Voltage-to-Voltage Measurements
In addition to the current transformer choices, the display will also
indicate "10-750 V ADAPTER". This selection is to be used in
conjunction with the Arbiter Systems Model 09184A Auxiliary
Voltage Adapter, to allow the 918B to perform voltage-to-voltage
phase angle measurements. Refer to Section 3.5 for further
information.
2.2.1.2 Changing the Phase Convention
When used for measurement of the phase angle between a voltage
and current, the 918B will display a value, which is dependent upon
the phase convention that is being employed. There are four
selections available for phase convention.
Lead; 0 – 360
This is the default setting. The displayed value will be a positive
number between 0 and 360, corresponding to the number of degrees
by which the current leads the voltage.
Lag; 0 – 360
The displayed value will be a positive number between 0 and 360,
corresponding to the number of degrees by which the current lags
the voltage.