Vanguard Tri-Phase - Manual (Page 112)

TRI-PHASE OPERATING™ INSTRUCTIONS
112
19.1 Test Voltage Selection
The TRI-PHASE™ has the capability to output three different test voltages of 8Vac, 40Vac, or
100Vac. The test voltages are generated by an internal oscillator.
• The 8Vac test voltage is for testing transformers which require low test voltages, such as
metering Current Transformers (CT). Higher test voltages may drive the CT's into saturation
giving invalid results.
• The 40Vac test voltage is recommended for testing power transformers. When the
TRI-PHASE™ is powered-on, the transformer test voltage is set to 40Vac.
• The 100Vac is recommended for testing power transformers in noisy environments.
The test voltages are selected either when using the “Computer Interface Mode” or from the
keypad.
1. 8V .
2. 40V
3. 100V
Figure 72.0 Test Voltage Selection Menu
a. Description: The operator selects the desired test voltage (8Vac, 40Vac, and 100Vac).
The default voltage of 40V is set at power-on.
b. Origin: From “Setup Menu” select menu option 2. Selection of 2 may be made by turning
the Control Knob. Push down the Control Knob after 2 is selected.
c. Action Options: Press key number 1 or push down the Control Knob to select 8Vac. Press
key number 2 to select 40V. Selection of number 2 may be made by turning the Control
Knob. Push down the Control Knob after number 2 is selected. Press key number 3 to select
100V. Selection of number 3 may be made by turning the Control Knob. Push down the
Control Knob after number 3 is selected.
d. Action To Perform: Select menu option 1 for this example.
NOTE:
After a test voltage is selected the TRI-PHASE™ will continue to use the test voltage until another
test voltage is selected or the unit is powered-down.