Relative - Keithley SourceMeter 2400 User Manual

8-2 Relative and Math

Relative

The rel (relative) feature can be used to null offsets or subtract a baseline reading from
present and future readings. With REL enabled, subsequent readings will be the difference
between the actual input value and the rel value as follows:
Displayed Reading = Actual Input - Rel Value
Once a rel value is established for a measurement function, the value is the same for all
ranges. For example, if 5V is set as a rel value on the 20V range, the rel value is also 5V on
the 2V and 200mV ranges.
Selecting a range that cannot accommodate the rel value does not cause an overflow condi-
tion, but it also does not increase the maximum allowable input for that range. For exam-
ple, on 20V range, the SourceMeter still overflows for a >21.1V input.
NOTE When rel is enabled, the REL annunciator turns on. Changing measurement
functions disables rel.
Front panel rel
Enabling and disabling rel
Rel can be used to null out zero offsets or to establish a zero baseline by pressing the REL
key. The reading (which becomes the rel value) is subtracted from itself. As a result, a zero
reading is displayed. Pressing REL a second time disables rel.
Defining a rel value
A unique rel value can be established for the selected measurement function from the front
panel as follows:
1. Press CONFIG and then REL. The present rel value will be displayed.
2. Set the desired rel value. (See
3. With the desired rel value displayed, press ENTER. The SourceMeter will return to
the normal source-measure display with rel enabled. The reading will reflect the
defined rel value.
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2400 Series SourceMeter
Section 1, "Rules to navigate menus," for details.)
User's Manual