Entering Data And Calculating Limits In The Calibration Specifications Grid - Fluke 750SW User Manual

15.2.2.6.4 Plus or Minus
Selecting "Plus/Minus" will instruct the system to calculate the high and low limits for
each test point as plus or minus a discreet value. For example, +/- 3 mV at a test point of
100 mV would result in a low limit of 97 mV and a high limit of 103 mV.
15.2.2.6.5 Manual
Selecting "Manual" will result in the system not performing any calculations for you,
even if you have entered values into the accuracy % or plus/minus fields. With this stated
accuracy selected you must manually enter all input, output and limit values into the cells
in the grid.

15.2.2.7 Entering Data and Calculating Limits in the Calibration Specifications Grid

15.2.2.7.1 Correlation to Output
Before input, output and low/high limit values are entered into the calibration
specifications grid, you should set the Correlation to Output field. This is not to say that
the correlation selected cannot be changed after the grid is populated, in fact DPCTrack2
will auto-update the grid if the correlation is changed any time after the grid is populated.
However, the logical flow for entering data on this screen includes setting this field
before entering input values and calculating limits. The default value is Linear.
The Correlation to Output field contains three (3) options on its drop-down list, "Linear",
"Manual" and "Square Root". Selecting either "Linear" or "Square Root" for this field
will enforce that type of correlation between the Instrument's input and output values.
For example, if you select to enforce a "Linear" correlation, then with input values of
4.00, 12.00 and 20.00 mA (for an input range of 4-20 mA), the corresponding output
values will automatically be calculated by the system as 0.00, 50.00 and 100.00 psig (for
an output range of 0-100 psig). If you select a "Square Root" Correlation to Output then
with the same input range and input values, the system would calculate the output values
to be 0.00, 70.71 and 100.00 respectively. With either "Linear" or "Square Root" selected
for the Correlation to Output field, you will be restricted from modifying any of the
output values in the grid unless you reset the Correlation to Output field to "Manual"
which allows for manual modification of the output values.
15.2.2.7.2 Linear or Square Root Correlation to Output
If the calibration you are going to perform on the Instrument is linear or square root and
you have filled in all of the required fields in the gray section of the screen and selected
the correct Correlation to Output, then you may click the Calculate button. Clicking this
button will invoke a dialog box with two (2) options, "Auto-Assign Input" and "Calculate
Limits". Selecting "Auto-Assign Input" will instruct the system to populate the In Val
cells in the grid with the correct input values as calculated from the number of calibration
points selected and the Instruments input range. In addition, the system will also
automatically calculate and fill in the cells in the Out Val column reflecting the selected
correlation. If you prefer to manually enter the Instrument's input values, then type those
values into the appropriate cells in the grid. As you enter each input value, you will notice
that the corresponding output value for each setpoint will still be automatically calculated
by the system.
Once the input values have been entered into the grid either manually or by the system,
then click the Calculate button again and select "Calculate Limits" to have the system
automatically calculate the low and high spec and control limits (if applicable) for each
setpoint. At this point if you elect to manually modify any of the input values then hitting
the tab key after making the modification will trigger the system to recalculate that
setpoint's output value and low/high limits.
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