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SCPI Command Reference
2400 Series SourceMeter
®
User’s Manual
+814 “Mismatched brackets”
— Improper use of brackets for vectored
math expression indices. For example, CALC1:MATH:EXPR
(VOLT[0*CURR[0]) generates this error.
+815 “Too many parenthesis”
— Too many closed parentheses were
detected. For example, CALC1:MATH:EXPR (In(VOLT)) gener-
ates this error.
+816 “Entire expression not parsed”
— Occurs when the input expres-
sion does not produce a function for the SourceMeter to calculate.
+817 “Unknown token”
— Attempted to define an expression using an
invalid function name.
+818 “Error parsing mantissa”
— Occurs when a floating point num-
ber has an invalid mantissa.
+819 “Error parsing exponent”
— Occurs when a floating point num-
ber has an invalid exponent.
+820 “Error parsing value”
— Occurs when an invalid floating point
number is entered.
+821 “Invalid data handle index”
— An invalid array index value was
assigned to a vectored expression. Array indices start at 0 and can
be as high as 2499.
Notes:
•
Up to five user-defined math expressions can be created.
•
A selected math expression can only be performed if CALC1 is
enabled. (See “
:STATe <b>
.”)
•
When the math expression is vectored, the math result will not be
generated until all source-measure operations for the vector array
are performed.
•
Initializing memory (:SYSTem:MEMory:INITialize) deletes all
user-defined math expressions and selects the POWER expression.
Program examples
OFFCOMPOHM, VOLTCOEF, and VARALPHA require two source-
measure sweep points in order to perform the math expressions. Shown
below are code fragments that will properly configure the SourceMeter
to perform the built-in math expressions:
Power:
*RST
:SENS:FUNC:OFF:ALL
:SENS:FUNC “VOLT”,“CURR”
:CALC:MATH:EXPR:NAME
“POWER”
:CALC:STAT
ON
:OUTPUT
ON
:INIT
:CALC:DATA?
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