Scale Grid; Scale Units - Omega RD8800 User Manual

Chapter 5 Programming
end points are programmed in exponents with an implicit base 10 in the range 10
be linear between the low and mid points and the mid and high points, and the mid point need not be
midway between the low and high points. The graph can thus be made to amplify data by offsetting the
midpoint. For example, if the full scale is zero to 10, and low = 0, high = 10 and mid = 8, half the display
will show 0 to 8 and the other half will show 8 to 10. Thus the upper half of the display represents only 20%
of the chart and will have four times the resolution of the lower half of the display as shown below:
Scale:
To set the Scale ends:
From the Scales menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Scale ends and then press the
ENTER button. You will be prompted with "places? X". Use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to select the
desired number of decimal places and press the ENTER button. You will be prompted with "lo→XXX←".
Use the numeric keypad to set the low scale value and press the ENTER button. You will be prompted with
"mid→XXX←". Use the numeric keypad to set the midpoint scale value and press the ENTER button. You
will be prompted with "hi→XXX←". Use the numeric keypad to set the high scale value and press the
ENTER button. The display will return to the Scale menu.
NOTE: If the point data falls outside the programmed range of a selected scale, the information recorded
will only reflect the upper or lower most value on the scale.

5.5.2.3 Scale grid

The scales are shown on top of the chart with the major and minor divisions. The grid printed on the chart
is the vertical continuation of the major divisions. For the Log scales, the major and minor divisions are
fixed with nine minor and one major division for each decade.
NOTE: If the number of decades between the ends and the midpoint of the scale is greater than eight, the
minor and major divisions are not printed. If the grids are too fine they may appear as a solid line
on the display which may not be able to resolve them.
To program the Scale grid:
From the Scales menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Scale grid and then press the
ENTER button. You will be prompted with "lo major→XX←" which is the number of vertical grids that will be
printed on the screen. Use the numeric keypad to enter the desired number of major grids and press the
ENTER button. You will be prompted with "lo minor→XX←" which is the number of vertical stripes that will
be printed between the major grids on the screen. Use the numeric keypad to enter the desired number of
minor grids and press the ENTER button. Repeat for "hi major→XX←" and "hi minor→XX←".

5.5.2.4 Scale units

A five character Engineering units field can be programmed for each scale, which is shown at the top of the
graph. This Scale unit along with the Engineering units is also recorded to disk. The same line also
identifies the pens trending in the scale with the point number associated to each pen.
To program the Scale units:
From the Scales menu use the UP (↑ ↑ ↑ ↑ ↑ ) or DOWN (↓ ↓ ↓ ↓ ↓ ) button to highlight Scale units and then press the
ENTER button. You will be prompted with "units→XXXXX←". Use the alphanumeric keypad to enter the
desired Scale units and press the ENTER button to return to the Scale menu.
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0|__|__|2_|__|4_|__|6_|__|8_|__|__|__|9_|__|__|__|10
0 —— 1 per division —— 50 —- 0.25 per division — 100%
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to 10 . The graph will
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