Keithley 486 Quick Reference Manual page 11

When zero correction is performed, only the present
range is zero corrected. Before making measurements, it
is recommended that each current range be zero cor-
rected.
To perform zero correction:
1. Enable zero check.
2. To perform zero correction, press SHIFT and then
CORRECT in that order.
Filters
SHIFT
cl
Filtering is used to stabilize noisy measurements. The
Model 486/487 has two available filters; a digital filter and
an analog filter. The digital filter bases the reading on the
weighted average of a number of measurement conver-
sions. The analog filter is a simple RC filter whose time
constant varies with the selected range.
When the filter is enabled, the selected filter(s) (digital fil-
ter, analog filter or both) will be used.
10