Raytech TR-MARK III Instruction Manual page 60

Operation in Details
After following the connection instructions previously listed, switch on the power to the
TR-MARK III and also on the T-Rex. (Power on sequence is not critical as the TR-MARK III
and the T-Rex communicate constantly). After a 2 second delay both systems should turn
on. The T-Rex should have all three phase lamps illuminated and the TR-MARK II/III should
have the display screen illuminated.
The first step in operation of the T-Rex is to ascertain the correct Vector phasing of the
transformer under test (See also "Test Result Notes" below for better understanding). This is
accomplished by running a standard Ratio test on the transformer using the TR-MARK III. If
the correct Phase displacement is known proceed to step 2.
1. Select the correct transformer configuration on the TR-MARK III then select "?" if the
Vector phasing is unknown. Run a standard ratio test (refer to the TR-MARK III
instructions). The TR-MARK III will display the correct vector phasing at the
completion of the test.
2. Select the following screen (New Transformer) on the TR-MARK III to initialize
operation of the T-Rex.
3. Enter the correct Phase displacement number. Note: The Vector phasing (number 0
shown in the example) should be the same as previously tested. The Vector phasing
can be changed if desired.
4. Press "GO" then "Go ABC" on the TR-MARK III and the test sequence will check,
calibrate, and test each phase sequentially (A, B, C) while applying three phase
voltage to the transformer.
5. The Results of the voltage ratio and phase relationship will be displayed on the
TR-MARK III screen.
6. End of Test. It is now possible to print or store the test results (see the TR-MARK III
instructions).
90100.1.02 Instruction Manual TR-MARK III Page 60 of 70