B&K Precision 5491B - Manual - Manual (Page 29)

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Table 3-2 Available 2 nd display parameters for different measurement functions
Primary Display
Secondary Display
DC V AC V dBm dB Hz
AC V DC V dBm dB Hz
DC V+AC V dBm dB Hz AC V DC V
DC I AC I Hz
AC I DC I Hz
DC I+AC I Hz AC I DC I
Hz AC V/AC I AC I/AC V
Percentage (%)
(Measuring value)
%
Comp
(Measuring value)
HI，IN，LO，PASS，FAIL
Max/Min
(Measuring value)
Max Min
Note: When a 2 nd parameter is displayed, the measurement range for that measurement is
based on the main measurement function (primary display).
3.9 Math Functions
The multimeter math operations are divided into three categories:
 Percent
 dB and dBm calculations
 Limit testing
The first two categories are discussed here; reading limit testing will be described in the following
chapter
– “Measurement Options”.
3.9.1 Percent
If the percent calculation is selected, a reference value must be specified. The displayed reading will be
expressed as percent deviation from the reference value. The percentage calculation is performed using
the following formula:
reference
reference Input
Percent


Where: Input is the normal display reading
Reference is the user-entered constant
Percent is the displayed result
To configure the percent calculation, perform the following steps: