Model 6517B Electrometer Reference Manual
Section 9: Filters and math
6517B-901-01 Rev. C / August 2015
9-9
Deviation
The following math calculation provides the deviation between the normal display reading and the
user specified reference value:
Where:
X is the normal display reading
Y is the specified reference value
Deviation is enabled through the CONFIGURE MATH menu.
Ratio
The following calculation divides the normal display reading by the user specified reference value:
Where:
X is the normal display reading
Y is the specified reference value
Ratio is enabled through the CONFIGURE MATH menu.
Logarithmic
This calculation converts input readings to logarithmic base 10 values. The calculation is shown as
follows:
log
10
X = Y
Where:
X is the input reading
Y is the logarithmic result
Example: Assume that exactly 1mA is being measured by the Model 6517B.
log
10
1.000000mA = -3
Note that this calculation uses the absolute value of the normal input reading since you cannot
compute the log of a negative number.
