Fluke 9100 - Page 131

Section 4: Using the Model 9100: DC Current Function 4.5-5
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Section 3 Editing Tutorials
4.5.4.1 Output, Offset and Deviation
The Output, Offset and Deviation and 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 +10mA with a +1mA Offset will be output as +11mA.
b. A set Output Value of -40mA with a +10mA Offset will be output as -30mA.
c. A set Output Value of +100mA with a -300mA Offset will be output as -200mA.
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 10A set on the display, will be increased to 10.5A by a +5%
Deviation.
b. An Output Value of -50mA set on the display, will be decreased to -45mA 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 current; x is the set output current; m is the set deviation percentage;
c is the set offset current.
For example:
a. Set Values: Output = +10A Deviation = +5% Offset = +3A.
Terminal Current will be:
[(1 + 5/100) x 10A] + (+3A) = [1.05 x 10] +3A = +13.5A
b. Set Values: Output = +40mA Deviation = -10% Offset = -50mA.
Terminal Current will be:
[(1 - 10/100) x 40mA] + (-50mA) = [0.9 x 40] - 50mA = -14mA
4.5.4 Value Editing