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Model 2701 User’s Manual Rel, Math, Ratio, Channel Average, dB 5-9

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:

where: Input is the normal display reading.

Reference is the user entered constant.

Percent is the displayed result.

NOTE When using Rel, the rel’ed reading of the input signal is used by the percent

calculation.

Percent conﬁguration

1. Press SHIFT and then MATH to display the math menu.

2. Press the RANGE  or  key to display “PERCENT” and press ENTER to display

the present reference value:

REF +1.000000  (factory default)

3. Key in the reference value. The  and  keys control cursor position and the  and

 keys increment/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.

4. 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.

5. To disable mX+b, again press SHIFT and then MATH. The MATH annunciator

will turn off.

NOTE The result of the percent calculation is positive when the input exceeds the

reference 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%).

Percent

Input Reference–

Reference

-------------------------------------------

100%×=

Keithley 2701 User Manual

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