4-6 Relative, mX+b, and Percent (%)
mX+b and percent (%)
mX+b
This math operation manipulates normal display readings (X) mathematically according to
the following calculation:
Y = mX+b
where: X is the normal display reading
m and b are user-entered constants for scale factor and offset
Y is the displayed result
To configure and control the mX+b calculation, perform the following steps:
1. Press SHIFT and then MX+B to display the present scale factor:
M: +1.0000000 ^ (factory default)
2. 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 multiplier and use the and keys (m = ×0.001, ^ = ×1, K = ×1000, and
M = ×1,000,000). With the cursor on the polarity sign, the and keys toggle
polarity.
3. Press ENTER to enter the M value and display the B value:
B: +00.000000 m (factory default)
4. Key in the offset value.
5. Press ENTER to enter the B value and display the two-character UNITS designator:
UNITS: MX (factory default)
6. Use the cursor keys and the or key if you wish to change the units designator. Each
character can be any letter in the alphabet (A through Z), the degrees symbol (°), or the
ohms symbol (Ω).
7. Press ENTER. The MATH annunciator will turn on, and the result of the calculation will
be displayed. Note that the calculation will be applied to all measurement functions.
8. To disable mX+b, again press SHIFT and then MX+B. The MATH annunciator will turn
off.
NOTE mX+b does not affect analog output. Analog output has its own gain and offset
settings (see Section 10 for details).
mX+b Relative — The mX+b function can be used to manually establish a relative (rel)
value. To do this, set the scale factor (M) to 1 and set the offset (B) to the rel value. Each
subsequent reading will be the difference between the actual input and the rel value (offset). See
“Relative” for more information.
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