5-6 Relative, mX+b, m/X+b (reciprocal), and log Model 6485 Picoammeter Instruction Manual
2. Key in a scale factor value. The and keys control cursor position and the and
range keys increment and decrement the digit value. To change range, place the
cursor on the range symbol and use the and keys. With the cursor on the polar-
ity sign, the and keys toggle polarity.
NOTE Range symbols are defined in Table 5-1.
3. Press ENTER to enter the M value and display the offset (B) value:
B: +00.000000 P (factory default)
4. Key in the offset value.
5. Press ENTER to set the B value and display the one-character UNITS designator:
UNITS: X (factory default)
NOTE The configuration for mX+b calculations consists of a units designator, a value
for M, and a value for B. This configuration is used for both the mX+b and the
m/X +b calculations. Therefore, changing either configuration (of the mX+b or
the m/X+b calculation) also changes the other calculation’s configuration.
6. To change the units designator (default is “X”, press the cursor key, and use the
and range keys. The character can be any letter in the alphabet (A through Z).
7. Press ENTER. The MATH annunciator and the units designator will turn on, and
the result of the calculation will be displayed. Note that the calculation will be
applied to all measurement functions.
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 6485.
NOTE This calculation uses the absolute value of the normal input reading as the log
of a negative number cannot be computed.
10
Xlog Y=
1.000000mA
10
log 3–=
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