Model 2450 Interactive SourceMeter® Instrument Reference Manual
Section 3: Functions and features
2450-901-01 Rev. B/September 2013
3-7
Reciprocal (1/X)
You can set math operation to reciprocal to display the reciprocal of a reading.
The reciprocal is 1/X, where X is the reading. If relative offset is on, the 1/X calculation uses the input
signal with the relative offset applied.
The result of the 1/X calculation may be displayed in exponential notation. For example, a displayed
reading of +2.500E+03 is equivalent to 2500.
Example:
Assume the normal displayed reading is 002.5000 Ω. The reciprocal of resistance is conductance.
When the reciprocal math function is enabled, the following conductance reading is displayed:
0.400000
When the reciprocal math operation is active, the unit of measure for the front-panel voltage and
current readings is
R
and the MATH indicator is displayed to the right of the measurement. For
resistance readings, the units of measure do not change. You cannot change this units designator.
Setting percent math operations
From the front panel:
1. Press
FUNCTION
and select the measurement function.
2. Press the
MENU
key.
3. Under Measure, select
Filter/Math
.
4. Next to Math State, select
On
.
5. Next to Math Function, select
Percent
.
6. Next to Zero Percent Reference, enter the percentage.
Using SCPI commands:
To set the math operations to percent, send the commands:
:CALCulate:VOLTage:MATH:FORMat PERCent
:CALCulate:VOLTage:MATH:PERCent <n>
where
<n>
is the constant.
To set the percent math operation for another measurement function, replace
VOLTage
with
CURRent
or
RESistance
.
Using TSP commands:
Set the measurement function, and then send the commands:
smu.math.format = smu.MATH_PERCENT
smu.math.percent =
value
smu.math.enable = smu.ON
where
value
is the constant
