Percent - Keithley 2750 User Manual

5-10 Rel, Math, Ratio, Channel Average, dB
mX+b rel
The mX+b function can be used to manually establish a 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).

Percent

This math function determines percent deviation from a specified reference value. The
percent calculation is performed as follows:
Percent
where:
NOTE
Percent configuration
1.
2.
3.
4.
5.
NOTE
Input Reference –
×
------------------------------------------ -
=
Reference
Input is the normal display reading.
Reference is the user entered constant.
Percent is the displayed result.
When using Rel, the rel'ed reading of the input signal is used by the percent
calculation.
Press SHIFT and then MATH to display the math menu.
Δ
Press the RANGE or
play the present reference value:
Δ
REF +1.000000 (factory default)
Key in the reference value. The
∇
and keys increment/decrement the digit value. To change range, place the cursor
on the multiplier and use the
and M = × 1,000,000). With the cursor on the polarity sign, the
gle polarity.
Press ENTER. The MATH annunciator will turn on, and the result of the calcula-
tion will be displayed. Note that the calculation will be applied to all measurement
functions.
To disable mX+b, again press SHIFT and then MATH. The MATH annunciator
will turn off.
The result of the percent calculation is positive when the input exceeds the refer-
ence 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%).
Model 2750 Multimeter/Switch System User's Manual
100%
∇
key to display "PERCENT," and press ENTER to dis-
and keys control cursor position, and the
Δ ∇
keys (m = × 0.001,
and
Δ
Δ
= × 1, K = × 1000,
Δ ∇
and keys tog-