Fluke 9100 - Page 183

Section 4: Using the Model 9100: Conductance Function 4.8-5
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Section 3 Editing Tutorials.
4.8.4.1 Output, Offset and Deviation
The Output, Offset and Deviation values can be edited 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 Conductance value, and
a negative offset will reduce the output Conductance value.
For example:
a. A set Output Value of 10µS with a +1µS Offset will be output as 11µS.
b. A set Output Value of 400nS with a -100nS Offset will be output as 300nS.
c. A set Output Value of 100nS with a -300nS 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 Conductance value.
For example:
a. An Output Value of 10µS set on the display, will be increased to 10.5µS by a +5%
Deviation.
b. A -10% Deviation will reduce an Output Value of 50µS set on the display, to 45µS.
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 voltage; x is the set output voltage; m is the set deviation percentage;
c is the set offset voltage.
For example:
a. Set Values: Output = 10nS; Deviation = +5%; Offset = +3nS.
Terminal Voltage will be:
[(1 + 5/100) x 10nS] + (+3nS) = [1.05 x 10nS] +3nS = 13.5nS
b. Set Values: Output = 40µS; Deviation = -10%; Offset = -30µS.
Terminal Voltage will be:
[(1 - 10/100) x 40µS] + (-30µS) = [0.9 x 40µS] - 50µS=6µS
4.8.4 Value Editing