Keithley 6482 - Measurement Math Functions; Math Functions

5-4 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 5: Relative, Math, Ratio, and Delta Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Relative offset programming example
Table 5-2 lists commands for setting up and enabling the relative offset feature. These commands
set up the Model 6482 as follows:
• Channel 1 relative offset value: 1e-3
• Channel 1 feed: SENS1 (current function block)
• Channel 1 relative offset state: Enabled
Measurement math functions
This section provides detailed information on the following math functions: I/V, V/I, MX + B, and
electrical power (V x I).
Math functions
Each Model 6482 channel has built-in math functions to calculate the following:
• I/V
•V/I
•MX + B
• Electrical power
NOTE The math functions use the current and voltage from the same channel for calculations.
I/V
This math function computes the ratio between the selected channel current measurement and the
voltage bias source value:
Reading = I/V
Where: I = Channel 1 or channel 2 current
V = Channel 1 or channel 2 voltage bias
V/I
This math function computes the ratio between the selected channel voltage bias source value
and the current measurement:
Reading = V/I
Where: V = Channel 1 or channel 2 voltage bias
I = Channel 1 or channel 2 current
Table 5-2
Relative offset programming example
Command Description
:CALC3:NULL:OFFS 1e-3
:CALC3:FEED SENS1
:CALC3:NULL:STAT ON
:OUTP1 ON
:INIT
:CALC3:DATA?
:OUTP1 OFF
Relative offset value = 1e-3.
Current measure feed.
Enable relative offset.
Output on.
Trigger reading.
Get reading.
Turn off output.