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Series 3700 System Switch/Multimeter Reference Manual
Section 5
:
Relative, Math, and dB
Document Number: 3700S-901-01 Rev. A / August 2007
5-5
value = '\\'
dmm.math.mxb.units = value
NOTE
When sending mxb units remotely, to embed a '\' into a string, precede the '\' with an
additional '\'. (see "To use the degrees symbol" paragraph).
Percent
This math function determines percent deviation from a specified reference value. The percent
calculation is performed as follows:
100%
Reference
Reference)
-
(Input
Percent
Where:
Input:
The normal measurement (if using REL, it will be the REL'ed value)
Reference:
The user-entered constant (dmm.math.percent)
Percent:
The result
NOTE
The REL'ed reading of the input signal (if using REL) is used by the percent
calculation.
NOTE
The result of the percent calculation is positive when the input exceeds the reference
and negative when the input is less than the reference. The result of the percent
calculation may be displayed in exponential notation. For example, a displayed
reading of +2.500E+03% is equivalent to 2500% (2.5K%).
Use dmm.math.mxb.bfactor and dmm.math.mxb.mfactor to set the b and m factor for mx + b.
Once all settings configured then, use dmm.math.enable = dmm.ON to enable math operation.
The
dmm.math.percent
attribute (see
dmm.math.percent
(on page 9-102)) specifies the
reference value for the percent calculation, while the
dmm.rel.acquire
function (see
dmm.rel.acquire
(on page 9-110)) uses the input signal as the reference value.
The acquire function triggers a single reading and uses the result as the new REL value. When
a value is set using
dmm.math.percent
(on page 9-102), the
dmm.math.percent
(on page 9-102)
query command returns the programmed value. When reference is set using
dmm.rel.acquire
(on page 9-110), the
dmm.math.percent
(on page 9-102) query command returns the acquired
reference value.