User manual

Section 6: Relative, Math, and dB Series 3700 System Switch/Multimeter Reference Manual
6-6 3700S-901-01 Rev. C / July 2008
Percent
This math function determines percent deviation from a specified reference
value. The percent calculation is performed as follows:
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%).
The dmm.math.percent attribute (see dmm.math.percent (on page 13-150))
specifies the reference value for the percent calculation, while the
dmm.rel.acquire function (see dmm.rel.acquire (on page 13-158)) 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 13-150), the
dmm.math.percent (on page 13-150) query command returns the programmed
value. When reference is set using dmm.rel.acquire() (on page 13-158), the
dmm.math.percent (on page 13-150) query command returns the acquired
reference value.