Touch View Interface (TVI). Note: To adjust current, touch the Magnitude window and it
should change color to Red. Using the Control Knob adjust the output current. One click
on the Control Knob is approximately 0.001 Amperes.
Table 8 Convertible Channel AC Current Test Values
AC Amperes
Output
Output Current
Measured
Output
Range Setting Tolerance
UUT MIN.
MAX.
5.00A 0.5
±12.5ma
0.4875
0.5125
2.5
±12.5ma
2.4875
2.5125
5
±12.5ma
4.9875
5.0125
6.4.6
Checking Phase Angle
Phase Angle is tested at either an output frequency of 50 or 60 Hz. Two sets of phase
angles are tested using one common reference for all tests, Voltage Channel 1. Angles
will be checked between V1 and all output current channels and V1 to all voltage
channels. Connect appropriate outputs from MPRT to the Phase Angle Meter.
Referencing all phase angles to V1, use Touch View Interface (TVI) to apply desired
phase angle to the Phase Angle Meter. When testing current use load box to convert
current to voltage for input into the North Atlantic Phase Angle Meter. In place of the load
box and the North Atlantic Phase Angle Meter, a Megger Model PMM-1 may be used to
measure the phase angle of the current directly. However, the error of the PMM-1, ± 0.05
degrees, must be added to the total allowable error (the North Atlantic Phase Angle
Meter measures angles between two voltages with an error of ± 0.0125 Degrees). MPRT
readings will be displayed on Touch View Interface (TVI). Start with angles between
voltage outputs V1 (reference) and V#.
From Main Menu press the Manual Tests display button. Press the Voltage/Current
button. Using the TVI, select two voltage output channels by pressing V1 (reference) and
then either V2, V3 or V4. Note: The unit is modular and may not have four output
modules installed. Set the output voltage 120 Volts for each output voltage channel. To
set an output value, press the Magnitude window and enter the desired value. Set the
phase angle to the desired voltage channel (V2, V3 or V4) as listed in the following Table
and initiate the output by pressing the Start button. The selected output indicator will
change from Green to Red. UUT output will be displayed on Touch View Interface (TVI).
Repeat for all values listed in the Table.
Table 9 Phase Angles Between V1 and V#
Phase Angle
(Ref V1)
Volts V#
Levels
120 V
0(360) ±0.25º
359.75
0.025
90 ±0.25º
89.75
90.25
180 ±0.25º
179.75
180.25
270 ±0.25º
269.75
270.25
To test angles between V1 and all current channels requires the use of a load box to
convert the current outputs to a voltage for input into the Atlantic Phase Angle Meter.
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167
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