Quick Start 
  Copyright ©  Itech Electronic Co., Ltd.  10 
 
①  Cooling window                                          ②  Remote sense terminal 
③   RS232  communication  interface          ④   USB  communication 
interface 
⑤  AC power socket (fuse contained)      ⑥GPIB communication interface 
2.6 Power-on Selftest 
A  successful  test  process  indicates  that  the  instrument  meets  the  factory 
specifications and can be operated well. 
Before  operation,  please  confirm  that  you  have  fully  understood  the  safety 
instructions. 
 
 
  The AC input voltage is 110V or 220V, please check the switching at the 
bottom of the power supply, to make sure it matches the voltage in your city. 
Otherwise, the power supply may be damaged. 
  Use  the  wires  of  rating  value  and  all  load  lines  shall  be  capable  of 
withstanding the maximum short circuit output current of the power supply 
without causing overheat. If there are more than one load, each pair of load 
lines  shall  be  capable  of  withstanding  the  full  rated  short-circuit  output 
current of the power supply. 
  Be sure to connect the main power socket to the power outlet of protective 
grounding. Do not use terminal board without protective grounding. Before 
operation, be sure that the power supply is well grounded. 
  To avoid burning out, pay attention to marks of positive and negative 
polarities before wiring. 
Self-test steps 
Normal self-test procedures: 
1.  Correctly connect the power cord. Press [Power] key to start up. 
VFD display information is as below.