Series 2600B System SourceMeter® instrument Reference Manual Section 2: Sourcing and measuring
2600BS-901-01 Rev. F/August 2021 2-65
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 measure function, the value is the same for all ranges
for that measure function. For example, if 0.5 A is set as a relative offset value on the 1 A range, the
relative offset value is also 0.5 A on the lower current ranges. Also, on the 1 A range, the 2600B still
overflows for a more than 1.02 A input.
When relative offset is enabled, the REL indicator turns on. Changing measurement functions
changes the relative offset value to the established relative offset value and state for that
measurement function.
Enabling and disabling relative offset from the front panel
To enable and use the relative offset feature, press the REL key on the front panel. The reading
(which becomes the relative offset value) is subtracted from itself, causing the SMU to display a zero
value. The reading is stored for use with subsequent measurements. Press the REL key a second
time to disable the relative offset.
Defining a relative offset value from the front panel
You can establish a relative offset value for the selected measurement function.
To establish a relative offset value from the front panel:
1. Press the CONFIG key and then the REL key.
2. Select the measurement function (CURRENT, VOLTAGE, OHMS, or WATTS).
3. Press ENTER or the navigation wheel. The present relative offset value is displayed.
4. Set the relative offset value.
5. With the relative offset value displayed, press the ENTER key or the navigation wheel, and then
press the EXIT (LOCAL) key to back out of the menu structure.
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