HP (Hewlett-Packard) 6622A Power Supply User Manual


 
Remote Operation80
The supply will respond with a ''1" which indicates that CMODE is on or a "0" which indicates that CMODE is off.
DCPON. The DCPON command sets the state of all outputs at power-on. You can specify if the outputs wake up enabled
or disabled when the unit is turned on. To enable all outputs at turn-on send:
DCPON 1
To disable all outputs at turn-on send:
DCPON 0
Note that these commands set the output voltage to zero and the output current to a slightly positive value when the
OUTPUT OFF command is issued. Therefore, the constant voltage feedback loop is active and the outputs are in constant
voltage mode when programmed “OFF”.
Starting with firmware revision A.00.04 and later, two additional commands let you set the output current to a slightly
negative value when the OUPUT OFF command is issued, causing the outputs to be in constant current mode when
programmed “OFF”. The benefit of being in constant current mode when the output is off is that if the load impedance
and the voltage and current settings are such that the unit is forced into constant current mode at turn on, then the current
feedback loop will be active during the transition to OUTPUT ON, and there will be no output current overshoot due to
mode crossover.
To enable all outputs in constant current mode at turn on send: DCPON 2
To disable all outputs in constant current mode at turn-on send: DCPON 3
Table 5-8. Error Messages
Front Panel
Response
HP-IB
Code
Explanation
.
NO ERROR 0 This is the response to the ERR? query when there are no errors.
INVALID CHAR 1 You sent the supply a character it did not recognize.
INVALID NUM 2 Format of your number is incorrect. Check number syntax.
INVALID STR 3 or 28 Occurs when you send a command the supply does not understand.
SYNTAX ERROR 4 Either too many parameters are sent without delimiters or the number
representation is incorrect. Follow the Syntax Diagram in Figure 5-2. Check
spaces and delimiters.
NUMBER RANGE 5 An out of range number was sent. Send a new number within the legal range.
NO QUERY 6 Computer addressed the supply to talk, but it did not first request data. Send
query first then address supply to talk.
DISP LENGTH 7 Quoted string exceeds the display length of 12 characters. Shorten string to a
maximum of 12 characters.
BUFFER FULL 8 This error may occur if too many numbers are sent. Error #4 or #5 may occur
first.
EEPROM ERROR 9 EEPROM is not responding correctly to programming commands. An
instrument failure has occurred and service is required.