Keithley 6517B Reference Manual

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.

Keithley 6517B Specifications

General

Input Impedance	>200 TΩ
Electrometer Type	Electrometer/High Resistance Meter
Current Measurement Range	20 fA to 20 mA
Display	Vacuum Fluorescent Display
Communication Interfaces	IEEE-488 (GPIB), RS-232
Power Supply	100 V / 120 V / 220 V / 240 V; 50 Hz / 60 Hz
Resistance Measurement Range	Up to 200 TΩ