KEPCO ATE-DMG SERIES - Manual (Page 55)

ATE-DMG 042314 3-21
3.6.2 DCL CONTROL
The device clear (DCL) and selected device clear can be set to operate in two modes. In the
“output = 0V” mode, when the device clear is received, the output of the power supply is set to
zero volts. In the “output unchanged” mode sending DCL or selected DCL has no effect on out-
put voltage and current as required by IEEE specification 488.2. The factory default value is
“output unchanged” mode. NOTE: When set to “output = 0V” mode, the power supply will power
up with OUTPUT set to OFF.
To change the DCL mode the unit must be in command entry mode , then depress the MENU
key three times. The top line of the display will show the current setting: either DCL OUTP =
0V
or DCL = OUTP UNCHNG. Depress 1 for “output unchanged” mode where the output is unaf-
fected by DCL; depress 0 for “output = 0V” mode where DCL sets the output to 0 volts.
3.6.3 CHANGING THE GPIB ADDRESS
When the power supply is in local mode, command entry status , press MENU key twice. The
top line of the LCD indicates the current GPIB address. Enter new value and press ENTER to
accept new setting, or CLEAR to exit without changing setting.
3.6.4 ENABLING REMOTE ANALOG CONTROL
Before using the remote analog control feature (see PAR. 3.5_ which allows an external refer-
ence to control output voltage and current, the feature must first be enabled, either from the
front panel (see PAR. 3.4.14) or by using the following commands and queries via the remote
interface: DIAG:EXT (see PAR. B.12), DIAG:EXT? (see PAR. B.13), CURR:MODE (see PAR.
B.54), CURR:MODE? (see PAR. B.55), VOLT:MODE (See PAR. B.68) and VOLT:MODE? (See
PAR. B.69).
3.6.5 PROGRAMMING TECHNIQUES TO OPTIMIZE PERFORMANCE
Kepco's auto-crossover digital supplies can operate in either voltage mode with current limit, or
current mode with voltage limit. The operating mode is determined by the voltage and current
commands received, as well as the load. Each time voltage and current commands are
received, the unit must evaluate the commands and the load conditions to determine the proper
operating mode. Reducing the number of times this evaluation must be made is desirable
because Kepco's digital auto-crossover supplies employ two separate feedback loops. Each
time there is a potential mode change, there is always an uncontrolled period of a few millisec-
onds while the two feedback loops compete for control of the output. By changing only the
active parameter (e.g., voltage for voltage mode), there is no doubt as to what the operating
TABLE 3-7. IEEE 488 (GPIB) BUS DATA MODE MESSAGES
MNEMONIC MESSAGE DESCRIPTION COMMENTS
DAB Data Byte Received or Sent
END End Received or Sent
EOS End of String Received or Sent
RQS Request Service Sent
STB Status Byte Sent