![background image](http://html2.mh-extra.com/html/keithley/6487/6487_user-manual_3951658070.webp)
Relative, mX+b, m/X+b (reciprocal), and log
5-3
Programming example — relative
This program fragment establishes a 1
µ
A baseline for measurements:
CALC2:NULL:OFFS 1e-6
' Set Rel value of 1
µ
A.
CALC2:NULL:STAT ON
' Enable Rel.
SYST:ZCH OFF
' Turn off zero check.
INIT
' Trigger reading.
CALC2:DATA?
' Request Rel’ed reading.
mX+b, m/X+b (reciprocal), and Logarithmic
mX+b and m/X+b
The following math operations manipulate normal display readings (X) mathematically
according to the following calculations:
Y = mX+b
Y = m/X+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
NOTE
Changing the “m” or “b” for mX+b also changes it for m/X+b.
Logarithmic
This calculation converts input readings to logarithm base 10 values. The calculation is
performed as follows:
where: X is the input reading
y is the logarithmic result
For example: Assume that exactly 1mA is being measured by the Model 6487.
NOTE
This calculation uses the absolute value of the normal input reading as the log
of a negative number cannot be computed.
10
X
log
Y
=
1.000000mA
10
log
3
–
=
Содержание 6487
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Страница 35: ...1 20 Getting Started Model 6487 User s Manual...
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Страница 61: ...3 14 Measurements and Sourcing Voltage Model 6487 User s Manual...
Страница 85: ...7 8 Remote Operation and Commands Model 6487 User s Manual...
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