Fluke 9100 - Page 233

Section 4: Using the Model 9100: Capacitance Function 4.13-5
Final Width = 215mm
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Section 3 Editing Tutorials.
4.13.4.1 Output, Offset and Deviation
The Output, Offset and Deviation values can be changed using 'Digit' and 'Direct' edit
facilities as described in Section 3.
Offset Values
The effect of introducing a non-zero offset value is to change all set values of the output
by that of the offset. A positive offset will increase the output capacitance, and a negative
offset will reduce the output capacitance.
For example:
a. A set Output Value of 10µF with a +1µF Offset will be output as 11µF.
b. A set Output Value of 400nF with a -100nF Offset will be output as 300nF.
c. A set Output Value of 100nF with a -300nF Offset will not be enabled.
Deviation Percentage Values
The effect of introducing a non-zero deviation value is to change all set values of the
output by the fraction expressed by the deviation. A positive deviation will increase, and
a negative deviation will reduce, the output capacitance.
For example:
a. An Output Value of 10mF set on the display, will be increased to 10.5mF by a +5%
Deviation.
b. A -10% Deviation will reduce an Output Value of 50µF set on the display, to 45µF.
Combined Deviation Percentage and Offset
Deviation and Offset values are combined by first applying the deviation, then the offset,
to the output value in the form y = (1 + m/100).x + c, where:
y is the terminal capacitance; x is the set output capacitance;
m is the set deviation percentage; c is the set offset capacitance.
For example:
a. Set Values: Output = 10mF; Deviation = +5%; Offset = +3mF.
Terminal Capacitance will be:
[(1 + 5/100) x 10mF] + (+3mF) = [1.05 x 10mF] +3mF = 13.5mF
b. Set Values: Output = 40µF; Deviation = -10%; Offset = -30µF.
Terminal Capacitance will be:
[(1 - 10/100) x 40µF] + (-30µF) = [0.9 x 40µF] - 30µF=6µF
4.13.4 Value Editing