Section 4: Basic DMM operation
Series 3700A System Switch/Multimeter Reference Manual
4-48
3700AS-901-01 Rev. D/June 2018
To set and enable a relative offset through the front panel manually:
1. Select the measurement function and an appropriate range setting.
2. If you are using a switching module, close the input channel (see
(on page 3-13) for basic information about the front-panel user interface).
3. Press
CONFIG
, then press the
REL
key. The Relative Offset Menu is displayed.
4. Select
ENABLE
.
5. Select
Yes
. The REL annunciator turns on.
6. Press
EXIT
to return to the Relative Offset Menu.
7. Select
LEVEL
.
8. Set the relative offset value as needed.
9. Apply the signal to be measured. The relative offset value is subtracted from the next reading that
is triggered.
If you press the
REL
key, the manually entered value will be overwritten with an acquired value.
To disable the relative offset function:
Press
REL
a second time to disable the relative offset function.
You can perform the equivalent of relative offset manually by using the
(on page 4-50) math
function. Set
m
to
1
and
b
to the value of the offset.
Set relative offset through the remote interface
The
dmm.rel.level()
command is used to specify the relative offset value for the active function.
The
dmm.rel.acquire()
command uses the input signal as the relative offset value for the active
function. The
dmm.rel.acquire()
command is typically used to zero the display. For example, if
the instrument is displaying a 1 µV offset, sending
dmm.rel.acquire()
and enabling relative offset
(
dmm.rel.enable = dmm.ON
) zeros the display.
The following command sequence is equivalent to pressing the front panel
REL
key:
dmm.rel.acquire()
dmm.rel.enable=dmm.ON
To manually set a relative offset value of 1.5
V, use this command sequence:
dmm.rel.level=1.5e-6
dmm.rel.enable=dmm.ON
For example, if the instrument is on the DCV function, the
dmm.rel.acquire()
command is
applicable to DCV measurements.