Monarch Instrument DC 2000 - Manual (Page 73)

Page 5-7
Chapter 5 Programming
5.5.2 Scales
Scales are used to display and record all or part of the preselected Output Scale. The user can effectively zoom
all or part of the available range. The user can also configure the grids printed on the display. Two sets of 8
scales A through H can be programmed. Only one of the two sets is active at any given time. The active set
can be selected via remote switches or from the front panel using the FUNCtion programming option.
Each BAR GRAPH and/or pen is driven by a point. Any point in the system can be assigned to one or more
of the pens and/or bar graphs. A scale from A through H is selected for each point during point programming.
Since more than one point can be assigned to each scale, programming of the scale parameters is done
separately in the Scales menu. The point assignment connects the bar graphs, pens and display grids with
the corresponding scale.
To enter the SCALE menu use the UP ( ↑) or DOWN (↓) Arrow Keys to select the “Scales” and press ENTER.
The display will read “scale? XX”. Use the UP ( ↑) or DOWN (↓) Arrow Keys to select the scale to program, 1A
through 1H or 2A through 2H, and press ENTER.
Pressing ENTER will provide the following programming choices for the SCALE.
5.5.2.1 Scale Type
The scale type can be LINEAR or LOG. For linear scales, the point data is interpolated linearly across the
defined segments. For log scales, the log 10 of the data is used in the interpolation.
Use the UP ( ↑) or DOWN (↓) Arrow Keys to select the “Scale type” and press ENTER. Use the UP (↑) or
DOWN (
↓) Arrow Keys to select the “type LIN” for LINEAR or “type Log” for LOGARITHMIC and press
ENTER to select the displayed Scale type. The display will return to the “Scale type” menu item.
5.5.2.2 Scale Ends
A low, mid and high end point is programmed for each scale. The low and high end points indicate the
values at the left and right margins of the chart and the bottom-most and top-most segments of the bar
graph display. The mid point defines the center of the chart and need not be the halfway between the low
and high values of the scale. If the point data is outside the range between the low and high end-points, the
pen is positioned in one of the chart ends and the bar-graph is all-on or all-off. In the case of LOG scales,
these end points are programmed in exponents with an implicit base 10 in the range 10
-25 to 10 25 . The
graph will 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: 0|__|__|2_|__|4_|__|6_|__|8_|__|__|__|9_|__|__|__|10
0 —— 1 per division —— 50 —- 0.25 per division — 100%
Use the UP (
↑) or DOWN (↓) Arrow Keys to select the “Scale ends” and press ENTER. The display will
prompt for the number of decimal places desired, “places? X”. Use the UP (
↑) or DOWN (↓) Arrow Keys to
select the desired number of decimal places and press ENTER. The display will prompt for low scale
value, “low
→XXX←”. Use the numeric keypad to set the low scale value and press ENTER. The display
will prompt for low scale value, “mid
→XXX←”. Use the numeric keypad to set the mid scale value and
press ENTER. The display will prompt for high scale value. “hi
→XXX←”. Use the numeric keypad to set
the high scale value and press ENTER. The display will return to the scale ends menu item.
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.