KEPCO BOP 1KW-MG Operator Manual, Firmware Ver.4.12 and higher - Manual (Page 178)

B-22
BOP-1K 031014
FIGURE B-7. USING LIST:WAIT COMMANDS TO ALLOW AN EXTERNAL DEVICE TIME TO
FUNCTION WHILE IMPOSING A MAXIMUM WAIT TIME
NOTES: 1. The power supply is assumed to be operating in constant voltage mode.
2. This example assumes a BOP and a DVM is connected to a Unit Under Test (UUT). The DVM is
connected to EXT_E/ EXT_C (pins 5/6 of the BOP External Protection port). When the BOP out-
puts a low EXT_E/ EXT_C, The DVM takes a series of measurements and places its wait line low.
The DVM Wait line is connected to the Trigger Input (pin 3 of the of the BOP trigger port). When the
Trigger Input goes high (indicating the DVM has completed its measurements) the BOP will
advance to the next point. For this example it is assumed that the DVM will complete its measure-
ment within 25 mS to 75 mS unless a problem is encountered. A “dead man” timer is implemented
that allows up to 99 mS for the measurement to complete before automatically proceeding to the
next point, thereby preventing hang-ups due to a measurement problem.
3. The explanation below shows how each step of the list functions once the list is entered and
VOLT:MODE LIST (the last step) is executed.
LIST:CLE Clear list.
LIST:SET:WAIT .0333 Set wait time to max allowed value (33 mS).
LIST:SET:TRIGGER .001,ON Set trigger pulse width to 1 mS. Transistor across pins 5 and 6 of Exter-
nal Protection Port is now set off.
LIST:VOLT:APPLY LEVEL,.001,10 Create first point (10V).
LIST:DWELL:POINTS? Returns 10.
LIST:TRIGGER 10 Maintains output at 10V, generates a 1 mS 0V trigger pulse applied to
DVM, causing DVM to make measurement.
Trigger input low while DVM makes measurement.
LIST:WAIT:HIGH 10
Wait for DVM to complete measurement for 33 mS. Proceed to next
step if trigger input goes high (meaning the measurement is complete)
or 33 mS elapsed, whichever comes first.
Trigger input low while DVM makes measurement.
LIST:WAIT:HIGH 10
Wait for DVM to complete measurement for another 33 mS. Proceed to
next step if trigger input goes high (meaning the measurement is com-
plete) or 33 mS elapsed, whichever comes first
Trigger input low while makes measurement.
LIST:WAIT:HIGH 10
Wait for DVM complete measurement for another 33 mS (these three
steps allow a maximum wait time of 99 mS. Proceed to next step if trig-
ger input goes high (meaning the measurement is complete) or 33 mS
elapsed, whichever comes first.
LIST:REPEAT 10,13,20,30,40,50,60,70,80,90
Repeats steps 10 through 13 (from list:apply level to the third
list:wait:high 10) for the other 8 voltages (20, 30, . . . 90).
LIST:COUNT 10 Repeat sequence ten times.
CURR 2;:OUTP ON Establishes BOP output current of 2A.
VOLT:MODE LIST Executes the above list. A level is applied to the BOP output. One 1 mS
later the transistor at EXT_E and EXT_C (pins 5 and 6 of the External
Protection Port) conducts, providing a low to the DVM. The DVM imme-
diately places the BOP trigger input low. The BOP waits for the trigger
input to go high, then outputs the next level in the list. If the trigger input
never goes high, the three wait statements will maintain the level for 33
mS each. After 99 mS (three wait statements) has expired, the new
voltage level will be provided at the output. In this example, the pulse
must be less than 1 mS. but at least 50
µ S long to insure proper opera-
tion of the program.