Keithley 6430 User Manual

17-24 SCPI Command Reference
+817 “Unknown token” — Attempted to define an expression using an
invalid function name.
+818 “Error parsing mantissa” — Occurs when a floating point number has
an invalid mantissa.
+819 “Error parsing exponent” — Occurs when a floating point number has
an invalid exponent.
+820 “Error parsing value” — Occurs when an invalid floating point num-
ber 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.
• 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?
Offset compensated ohms:
*RST
:SENS:FUNC:OFF:ALL
:SENS:FUNC “VOLT”,“CURR”
:SOUR:FUNC VOLT or CURR
if :SOUR:FUNC VOLT then :SOUR:VOLT:STAR <n>;
STOP <n>; MODE SWE
if :SOUR:FUNC CURR then :SOUR:CURR:STAR <n>;
STOP <n>; MODE SWE

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