Keithley 486 Quick Reference Manual page 12

To check or change the filter selection:
Press SHIFT and then FILTER SELECT in that or-
der. One of the following messages will be dis-
played to indicate the currently selected filter(s):
FILTER DIGITAL
FILTER ANALOG
FILTER DIG+AN
(Digital filter selected)
(Analog filter selected)
(Both digital and analog
filters selected)
To select a different filter, use the rotary knob or the
4 and b keys to display the desired filter selection.
Enter the displayed filter selection by pressing
SHIFT and then FILTER SELECT.
Rel
REL
q 0
The rel (relative) feature serves as a means of baseline
suppression by allowing a stored offset value to be sub-
tracted from subsequent readings. When rel is enabled,
the instrument takes the currently displayed reading as a
baseline value. All subsequent readings represent the
difference between the applied signal level and the
stored baseline.
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