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A1. Phase shift display, Four figures display 0° ~ 360° phase angle.
A2. Load current display of output V phase, three and a half figures display.
A3. Voltage display of between output U, W phase, three and a half figures
display.
A4. Rough tune button
，
phase shift by the surface scale.
A5. Reset button of phase display. Press the key to display the phase angle.
A6. Latch button of phase display.With no change of phase, we can press the
key to lock the number.
A7. Power switch, this key can be pressed to put on or cut off the whole
internal power supply.
A8. Switch for the choice of output function. When it is turned to voltage
function, the machine gives the output of voltages of U,V,M phases which are
corresponding to the phase shift of input A,B,C source; and when turned to
