KEPCO KIT 219-0533, BOP 1000W Firmware Upgrade - Manual (Page 10)

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FIGURE B-2B. 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 outputs 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. 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 com-
plete its measurement within 25 milliseconds to 75 milliseconds unless a problem is encountered. A “dead
man” timer is implemented that allows up to 99 milliseconds for the measurement to complete before automat-
ically 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 milliseconds).
list:set:trigger .001,ON Set trigger pulse width to 1 millisecond. Transistor across pins 5 and 6 of External
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 millisecond 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 milliseconds. Proceed to next step
if trigger input goes high (meaning the measurement is complete) or 33 millisec-
onds elapsed, whichever comes first.
Trigger input low while DVM makes measurement.
list:wait:high 10
Wait for DVM to complete measurement for another 33 milliseconds. Proceed to
next step if trigger input goes high (meaning the measurement is complete) or 33
milliseconds elapsed, whichever comes first
Trigger input low while makes measurement.
list:wait:high 10
Wait for DVM complete measurement for another 33 milliseconds (these three
steps allow a maximum wait time of 99 milliseconds. Proceed to next step if trigger
input goes high (meaning the measurement is complete) or 33 milliseconds
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 millisecond
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 immediately 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 milliseconds each. After 99 milliseconds (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 millisecond. but at least 50 microseconds
long to insure proper operation of the program.