Error Information 
  Copyright © Itech Electronic Co., Ltd.  43 
"Module  Calibration 
Lost" 
During the start-up program initialization, 
if  the  instrument  can’t  read  the 
calibration  data  from  EEPROM,  the 
system will prompt an error. 
EEPROM data is stored unsuccessfully. 
While  using  the  dual-range  instrument, 
you  can’t  turn  the  output  on  in  1s  after 
switching the range, otherwise the system 
will prompt an error. 
The  odd  and  even  parity  of  RS-232 
communication is wrong.   
"Front  panel  buffer 
overrun" 
The  communication  buffer  is  overflow 
while using serial port. 
The  communication  is  overtime  while 
using serial port. 
"CAL  password  is 
incorrect" 
While sending calibration command, if the 
password  is  wrong  and  you  can’t  enter 
the  calibration  mode,  the  system  will 
prompt an error. For example, for model 
IT6831A,  the  correct  calibration 
command  is  CALibrate:SECure 
0,”6831”, if you send CALibrate:SECure   
0,”6811”,  the  system  will  prompt  an 
error. 
If  you  haven’t  switched  into  calibration 
mode,  sending  related  calibration 
command  will  cause  an  error.  For 
example,  if  you  haven’t  switched  into 
calibration  mode,  sending 
CALibrate:CURRent:LEVel  P1  command 
will cause an error.   
"readback  cal  are 
incorrect" 
If  you  don’t  calibrate  the  instrument 
according to the function requirement, the 
system will prompt an error. For example, 
while  calibrating  one  current  point,  the 
setting current value is over the maximum 
range, an error will occur. 
"programming cal are 
incorrect" 
If  you  don’t  calibrate  the  instrument 
according to the function requirement, the 
system will prompt an error. For example, 
if you don’t send CALibrate:CURRent 0.1 
after  sending  CALibrate:CURRent:LEVel 
P1, then send CALibrate:CURRent:LEVel 
P2 directly, an error will occur.