Keithley 6514, Instruction Manual

Page: 110 / 334

Relative, mX+b and Percent (%) 7-5
on the range symbol and use the and keys. With the cursor on the polarity sign, the
and keys toggle polarity.
NOTE Range symbols are defined in Table 7-1
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 enter the B value and display the three-character UNITS designator:
UNITS: MXB (factory default)
6. Use the and cursor keys, and the and keys if you wish to change the units des-
ignator. Each character can be any letter in the alphabet (A through Z).
7. Press ENTER. The MATH annunciator will turn on, and the result of the calculation will
be displayed. Note that the calculation will be applied to all measurement functions.
8. To disable mX+b, again press SHIFT and then MX+B. The MATH annunciator will turn
off.
Percent (%)
This math function determines percent deviation from a specified reference value. The per-
cent calculation is performed as follows:
where: Input is the normal display reading
Reference is the user entered constant
Percent is the displayed result
To configure and control the percent calculation, perform the following steps:
1. Press SHIFT and then % to display the present reference value:
REF: +1.000000 ^ (factory default)
2. Key in a reference 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 polarity sign, the and
keys toggle polarity.
3. Press ENTER. The MATH annunciator will turn on, and the result of the calculation will
be displayed. Note that the calculation will be applied to all measurement functions.
4. To disable percent, again press SHIFT and then %. The MATH annunciator will turn off.
NOTES The result of the percent calculation is positive when the input exceeds the reference,
and negative when the input is less than the reference.
The result of the percent calculation may be displayed in exponential notation. For
example a displayed reading of + 2.500E+03% is equivalent to 2500% (2.5K %).
Rel can be used on the result of the mX+b or percent math operation. Note however
that Rel will disable whenever a math function is enabled or disabled. See “Relative”
for details on using Rel.
Percent
Input
Reference
--------------------------- 100% × =