Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Section 4: Measurement optimization
077114601 / March 2019
4-13
Relative offset
When making measurements when using the power supply function, you may want to subtract an
offset value from a measurement.
This feature is not available for the battery test and battery simulation functions.
The relative offset feature subtracts a set value or a baseline reading from measurement readings.
When you enable relative offset, all measurements are recorded as the difference between the actual
measured value and the relative offset value. The formula to calculate the offset value is:
Displayed value = Actual measured value
– Relative offset value
When a relative offset value is established for a measurement function, the value is the same for all
ranges for that measurement function. For example, if 2 A is set as the relative offset value on the
10 A range, the relative offset value is also 2 A on the 1 A, 100 mA, and 10 mA ranges.
On the front panel, when relative offset is enabled, the REL indicator to the right of the measured
value is visible.
A relative offset value is saved for each function. If you change the measurement function, the
relative offset value is changed to the setting for that measurement function.
The relative offset is applied to the measurement before any math functions. For more information on
the order in which operations are performed, see
(on page 4-15).
When you select the concurrent measurement function, relative offset only applies to current
measurements and does not affect voltage measurements.
Establishing a relative offset value
You can use the 2281S to automatically determine the relative offset, or you can assign a specific
relative offset value.
