Fluke 9100 - Page 99

Section 4: Using the Model 9100: DC Voltage Function 4.3-5
Final Width = 215mm
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Section 3 Editing Tutorials
4.3.4.1 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 make the output value more positive, and a
negative offset will make the output value more negative.
For example:
a. A set Output Value of +10V with a +1V Offset will be output as +11V.
b. A set Output Value of -40V with a +10V Offset will be output as -30V.
c. A set Output Value of +100V with a -300V Offset will be output as -200V.
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 value.
For example:
a. An Output Value of 10V set on the display, will be increased to 10.5V by a +5%
Deviation.
b. An Output Value of 50V set on the display, will be decreased to 45V by a -10%
Deviation.
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 = 10V; Deviation = +5%; Offset = +3V.
Terminal Voltage will be:
[(1 + 5/100) x 10V] + (+3V) = [1.05 x 10] +3V = +13.5V
b. Set Values: Output = +40V Deviation = -10% Offset = -50V.
Terminal Voltage will be:
[(1 - 10/100) x 40V] + (-50V) = [0.9 x 40] - 50V = -14V
4.3.4 Value Editing