5520A
Operators Manual
5-30
An example of the coupled command interference is the command
*RST; OUT 100V, 1KHZ; WAVE SINE
followed by the commands
WAVE TRI
OUT 10V, 1KHZ
The WAVE TRI causes an error. At 100 V, only sine waves are allowed. Both WAVE and
OUT are coupled commands. So, the compound command
WAVE TRI; OUT 10V, 1KHZ
executes successfully. The WAVE and OUT are programmed together and at 10 V,
triangle waves are allowed.
5-31. Overlapped Commands
Commands that begin execution but require slightly more time to complete are called
overlapped commands, because they can be overlapped by the next command before
they have completed execution.
In Chapter 6, the command graphic
Overlapped
x
shows a check for overlapped
commands.
The overlapped commands, excluding scope commands, are:
CUR_POST MULT STBY
DBM OLDREF SYNCOUT
DC_OFFSET OPER TC_OFFSET
DPF OUT TC_OTCD
DUTY PHASE TC_REF
EARTH PRES_UNIT TC_TYPE
EXTGUARD RANGELCK TSENS_TYPE
HARMONIC REFCLOCK WAVE
INCR REFPHASE ZCOMP
LCOMP *RST
LOWS RTD_TYPE
You can use the command *WAI to wait until the overlapped command has completed
execution before executing the next command. For example,
OUT 1 V, 1 A, 60 HZ ; *WAI
You can also use the status commands *OPC and *OPC? to detect completion of
overlapped commands. (See “Checking 5520A Status.”)
5-32. Sequential Commands
Commands that execute immediately are called sequential commands.
In Chapter 6, the command graphic
Sequential
x
shows a check for sequential
commands.
The majority of the commands are sequential.
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