Keithley 2182 User Manual page 88

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:
To configure and control the mX+b calculation, perform the following steps:
1.
2.
3.
4.
5.
6.
7.
8.
NOTE
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.
X is the normal display reading
m and b are user-entered constants for scale factor and offset
Y is the displayed result
Press SHIFT and then MX+B to display the present scale factor:
M: +1.0000000 ^
Key in a scale factor value. The
range keys increment and decrement the digit value. To change range, place the cursor
on the multiplier and use the
M = ×1,000,000). With the cursor on the polarity sign, the
polarity.
Press ENTER to enter the M value and display the B value:
B: +00.000000 m
Key in the offset value.
Press ENTER to enter the B value and display the two-character UNITS designator:
UNITS: MX
Use the cursor keys and the
character can be any letter in the alphabet (A through Z), the degrees symbol (°), or the
ohms symbol (Ω).
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.
To disable mX+b, again press SHIFT and then MX+B. The MATH annunciator will turn
off.
mX+b does not affect analog output. Analog output has its own gain and offset
settings (see Section 10
(factory default)
and keys control cursor position and the
and keys (m = ×0.001, ^ = ×1, K = ×1000, and
(factory default)
(factory default)
or key if you wish to change the units designator. Each
for details).
and
and keys toggle