5-2
Return to
6482-901-01 Rev. A / August 2012
Section 5: Relative, Math, Ratio, and Delta
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Relative
The relative offset (REL) feature can be used to set offsets to zero (0) or subtract a baseline
reading from present and future readings. With relative offset enabled, subsequent readings are
the difference between the actual input value and the relative offset value, as follows:
Displayed reading = Actual input - Relative offset value
When relative offset is enabled, the REL indicator turns on.
Once a relative offset value is established for a measurement function, the value is the same for all
ranges. For example, if 1 mA is set as a relative offset value on the 20 mA range, the relative offset
value is also 1 mA on the 2 mA current range.
Selecting a range that cannot accommodate the relative offset value does not cause an overflow
condition, but it also does not increase the maximum allowable input for that range. For example,
on 2 mA range, the Model 6482 still overflows for a >2.1 mA input.
NOTE
In single-channel display mode, the REL indicator turns on for the displayed channel. In
dual-channel display mode, the REL indicator turns on if relative offset is enabled for
either channel.
Front panel relative offset
Enabling and disabling relative offset
Relative offset can be used to set offsets to zero (0) or to establish a zero baseline on the selected
measurement channel by pressing the
REL
key. The reading (which becomes the relative offset
value) is subtracted from itself. As a result, a zero (0) reading is displayed. Pressing the
REL
key a
second time disables the relative offset feature.
Defining a relative offset value
A unique relative offset value can be established for the selected channel from the front panel as
follows:
1. Press
MSR1
or
MSR2
to select either channel 1 or channel 2 measurement.
2. Press the
CONFIG
key and then the
REL
key. The present relative offset value will be dis-
played.
3. Set the relative offset value. See
,
for details.
4. With the relative offset value displayed, press the
ENTER
key. The Model 6482 will return to
the normal display with relative offset enabled. The reading will reflect the defined relative off-
set value.
Summary of Contents for 6482
Page 3: ......
