Keithley 6220, Reference Manual

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Model 6220/6221 Reference Manual Averaging Filter, Math, and Buffer 6-9
Return to Section 6 topics
Math
mX+b and m/X+b (reciprocal)
These math functions affect the results of the Delta, Pulse Delta, or Differential
Conductance operations. Details on the delta operations are covered in
Section 5 .
mX+b and m/X+b manipulate delta readings (X) from the model mathematically
according to the following calculations:
Y = mX+b
Y = m/X+b
Where: X is the normal delta reading.
m and b are user-entered constants for scale factor and offset.
Y is the displayed result.
Configuring and controlling mX+b and m/X+b
To configure and control either of these math calculations, perform the following
steps:
1. Press CONFIG and then MATH to enter the math configuration menu.
2. From the math menu, use the edit controls to select NONE (no math),
MX+B, or M/X+B . Selecting NONE exits the menu structure.
3. After selecting a math calculation, the present scale factor will be displayed
(factory default is M: +1.000000 ^).
4. Use the edit controls to set the scale factor digits, range multiplier*, and
toggle the polarity sign.
* Range multipliers: P = 10
-12
,
η
= 10
-9
,
μ
= 10
-6
, m = 10
-3
, ^ = 10
0
, K = 10
3
,
M = 10
6
, G = 10
9
, T = 10
12
5. Press ENTER to enter the M value and display the offset (B) value
(factory default is B: +0.000000 P).
6. Key in the offset value.
7. Press ENTER to set the B value and exit the menu.
8. To enable math, press the MATH key from the normal display. The MATH
annunciator will turn on and the result of the calculation will be displayed.
NOTE Changing the “m” or “b” for mX+b also changes it for
m/X+b.
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