User manual

Section 13: Instrument Control Library (ICL) Series 3700 System Switch/Multimeter Reference Manual
13-160 3700S-901-01 Rev. C / July 2008
dmm.rel.enable
Remarks
This is the relative measurement control setting for the DMM and it applies to the
selected function as indicated by dmm.func (on page 13-137). Querying the setting
when the selected function does not support it will cause nil to be returned.
When relative measurements are enabled, all subsequent measured readings will be
offset by the specified relative offset (see dmm.rel.level (on page 13-160)).
Specifically, each returned measured relative reading will be the result of the following
calculation:
Relative reading = Actual measured reading – Relative offset value
The command will generate an error when dmm.func equals one of the following:
"continuity"
"nofunction"
Also, an error will be generated if the value is out of range for the selected function.
Changing functions with dmm.func (on page 13-137) will reflect the relative enable
setting for that function.
The factory default and dmm.reset() (on page 13-161) function value is dmm.OFF.
Also see
dmm.rel.level (on page 13-160)
Example
To enable the relative measurements for AC current:
dmm.func = "accurrent"
dmm.rel.enable = dmm.ON
dmm.rel.level
Attribute
The offset value for relative measurements for the DMM.
Usage
To read the relative offset level:
value = dmm.rel.level
value: Represents the present relative offset level.
To write the relative offset level:
dmm.rel.level = value
value: Represents the desired relative offset level.