Function and Features 
  Copyright © Itech Electronics Co., Ltd.  31 
3.  Press right arrow key to “Dimmer” press    to confirm when 
“Dimmer” is shining. 
CONFIG   
Volt-MinVolt-Max > 
4.  Select “LeadingEdge” or “LaggingEdge” to active the function. Press 
 key to confirm when it is shining. Shining”*” indicate on 
VFD means dimmer function is in used, conversely,”*” disappeared. 
DIMMER 
LeadingEdge TrailingEdge Off 
5. 
Press   to quit the menu. 
DIMMER 
LeadingEdge TrailingEdge Off 
> Set phase angle and start test 
1.  Press compound key  (Shift)+  (*Dimmer)and enter menu 
operation 
Off         * 
0.0V   0.0mA   50.0 
0.00W      PF=0.000    0.0S 
2.  Press numeric key to set angle, press    to confirm. Also you 
can adjust angle by knob to view real-time waveform changes along . 
Off          * 
0.0V 0.0mA 50.0 
Dimmer=30.0° 0.1S 
3. 
Press    and numeric key to set voltage based on 
requirement. Press    to confirm. 
Off         * 
0.0V   0.0mA   50.0 
0.00W      PF=0.000    0.0S 
4.  Confirm that both List and Sweep are in Disable status (VFD 
appears no words of List or Sweep). Press    to turn on Output. 
The power supply starts outputting phase dimmer wave, and the “*” 
on VFD flicks. Press    again to stop output. 
Off         * 
0.0V   0.0mA   50.0 
0.00W      PF=0.000    0.0S 
3.11 Output range   
IT7300 series AC source will allow switchover between High range and Auto 
range. Take IT7321 as example, the voltage, current and apparent power at the 
High range is 300V/1.5A/300VA; the voltage, current and apparent power at the 
Low range is 150V/3A/300VA. Auto range refers to auto switchover mode 
between High range and Low range. 
You can choose the range according to actual test requirements. When Auto 
range is chosen, the switchover between High range and Low range will be 
performed by the instrument automatically, thus sparing complicated operations 
such as manual setting. 
Switch High range and Auto range: 
Press    (Shift) and    (High/Auto) together to switch between High