5-6
Relative, mX+b, m/X+b, and log
Model 6487 Reference Manual
3.
Key in a scale factor value. The
and
keys control cursor position and the and
RANGE keys increment and decrement the digit value. To change range, place
the cursor on the range symbol and use the and keys. With the cursor on the
polarity sign, the and
keys toggle polarity.
klqb
.
4.
Press ENTER to enter the M value and display the offset (B) value:
B: +0.000000 P (factory default)
5.
Key in the offset value.
6.
Press ENTER to set the B value and display the one-character UNITS designator:
UNITS: X (factory default)
klqb
The configuration for mX+b calculations consists of a units designator, a value
for M, and a value for B. This configuration is used for both the mX+b and the
m/X +b calculations. Therefore, changing either configuration (of the mX+b or
the m/X+b calculation) also changes the other calculation’s configuration.
7.
To change the units designator (default is “X”), press the
cursor key and use
the manual RANGE keys. The character can be any letter in the alphabet
(A through Z).
8.
Press ENTER.
9.
To enable math, press the MATH key from normal display. The MATH annunciator
and the units designator will turn on and the result of the calculation will be
displayed.
Logarithmic
This calculation converts input readings to logarithm base 10 values. The calculation is
performed as follows:
where: X is the input reading
y is the logarithmic result
For example: Assume that exactly 1mA is being measured by the Model 6487.
klqb
This calculation uses the absolute value of the normal input reading, as the log
of a negative number cannot be computed.
10
X
log
Y
=
1.000000mA
10
log
3
–
=
