Keithley 6430 User Manual

SCPI Command Reference 17-23
When you want to create a new user-defined math expression, perform the
following steps in order:
1. If desired, assign units to the calculation result. See :UNITs. Units is
stored for the calculation.
2. Assign a name to the expression (using up to 10 ASCII characters) using
this command.
3. Define the expression using the: DEFine or EXPRession command. The
new expression is the one that will be presently selected.
Math expression errors:
+801 “Insufficient vector data” — Returned to idle before acquiring enough
data to fully populate the vector. A CALC1 result is not built.
+804 “Expression list full” — Attempted to create a new expression name
when the list (catalog) is full. The maximum number of user-defined
expression names is five.
+805 “Undefined expression exists” — Attempted to create a new expres-
sion name while a previous expression name remains undefined.
Remember, after creating a name, you have to define the expression.
+806 “Expression not found” — Attempted to delete a named math expres-
sion that cannot be found.
+807 “Definition not allowed” — Attempted to define an expression that has
not been previously named.
+808 “Expression cannot be deleted” — Attempted to delete one of the
built-in math expressions. See :DELete.
+809 “Source memory location revised” — Occurs when a
:SOURce:MEMory sweep location references an expression that no
longer exists.
+811 “Not an operator or number” — Defined a null math expression by not
using a valid operator or number.
+812 “Mismatched parenthesis” — Number of open parentheses must be
the same as the number of closed parentheses. For example,
CALC1:MATH:EXPR (2*sin(VOLT) generates this error.
+813 “Not a number of data handle” — An invalid floating point number or
symbol other than VOLT, CURR, RES, or TIME appears in the math
expression.
+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)) generates
this error.
+816 “Entire expression not parsed” — Occurs when the input expression
does not produce a function for the SourceMeter to calculate.

Keithley 6430 Specifications

General

Type	Sub-Femtoamp Remote SourceMeter
Compliance Voltage	200 V
Maximum Output Voltage	200 V
Maximum Output Current	100 mA
Compliance Limit	Programmable
Interface	GPIB, RS-232
Input Impedance	>10^14 Ω