Series 2280 Precision DC Power Supply Reference Manual Section 4: Measurement optimization
077085503 / March 2019 4-13
Relative offset
When making measurements, you may want to subtract an offset value from a measurement.
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 displayed.
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 Displayed measurements (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 Series 2280 to automatically determine the relative offset, or you can assign a
specific relative offset value.
Setting a relative offset value
You can set a specific relative offset value using the front panel or the remote commands.
Using the front panel:
1. Select the measurement function. The relative offset will be applied to this function. For more
information, you can refer to Select a measurement function (on page 2-74).
2. Press the MENU key.
3. Under Measure, select Rel/Filter.
4. Select the button next to Reference and enter a value.
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