Keithley 2461 Reference Manual

Section
2: General operation Model 2461 Interactive SourceMeter® Instrument
Reference Manual
2-28 2461-901-01 A/November 2015
Measure Calculations menu
The Calculations menu contains settings that specify the way measurement
information is processed and returned.
Setting Description
Rel
Use the relative offset feature to subtract a set value or a baseline
reading from measurement readings. When you enable relative
offset, all subsequent measurements are displayed as the
difference between the actual measured value and the relative
offset value.
Rel Value
Sets the relative offset value to be applied to measurements.
Filter
Enables or disables the averaging filter for measurements of the
selected function. Not available for digitize functions.
Config
Displays the settings that are available for the averaging filter. Not
available for digitize functions.
Filter Type
Selects the type of averaging filter that is used for the selected
measure function when the measurement filter is enabled.
Select the moving average filter to continuously add measurements
to the stack on a first-in, first-out basis, replacing the oldest
measurement in the stack with a new measurement. Select the
repeating average filter to average a set of measurements and
then flush the data out of the stack before averaging a new set of
measurements. Not available for digitize functions.
Filter Count
This sets the number of measurements that are averaged when
filtering is enabled. Not available for digitize functions.
Math
This setting enables or disables math operations. When this is on,
the math operation specified by Math Format is applied to the
measurement.
Config
Displays the settings that are available for the math functions.
Math Format
When Math is enabled, you can specify which math operation is
performed on measurements. You can choose one of the following
math operations:
• mx+b: Manipulate normal display readings by adjusting the
m and b factors.
• Percent: Specify a constant that is applied to the
measurement and display readings as percentages.
• Reciprocal: The reciprocal math operation displays
measurement values as reciprocals. The displayed value is
1/X, where X is the measurement value (if relative offset is
being used, this is the measured value with relative offset
applied).
m(Scalar)
Defines the constant for the scale factor.
b(Offset)
Defines the constant for the offset factor.

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV