AVTMTTR100-ENG Rev 6 Nov 2015
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DESCRIPTION
Principle of Operation
The TTR test set provides accurate measurements of the transformer input and
output voltages and then calculates a transformer turn ratio. The TTR also
measures phase shift between primary and secondary windings of a transformer,
the DC resistance winding and transformer excitation current. In addition, it
provides polarity indications for single phase distribution transformers.
Resistance measuring circuitry tests primary and secondary winding resistance
at 25 mA (max) DC current.
Controls, Indicators, and Connectors (Figure 4-1)
Contrast
Backlight
This knob adjusts the viewing resolution of the screen.
A momentary depression of the switch will either activate or de-
activate the backlight. It will remain ON for a period of three
minutes without activity.
Power ON Switch
Power OFF Switch
Depressing this switch momentarily will active the TTR100.
Depressing this switch momentarily will de-active the TTR100.
EMERGENCY TEST
OFF
By depressing any key on the keypad will terminate the test in
progress.
DISPLAY SCREEN
LCD displays menus and test information. A low battery
indicator will be displayed in the upper right corner when one
hour of energy is remaining in the battery pack.
KEYPAD
16-button keypad for entering menu selections and navigating
through the various screens. In addition to alpha-numeric keys,
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