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73ET/74ET/75ET USERS MANUAL EM-7353-0003B Rev.5
Engineering range
Specify the range in actual engineering unit. The engineering range is shown on the digital meter when actual
recording is running. The range can be as precise as the second decimal place. For a thermocouple and RTD input,
Engineering Range selection is not available.
Plot Range
Values in engineering unit for the plot range displayed on the chart. These values are usually the same as Engineer-
ing Range values. Set a narrower range when you want to enlarge a particular section of the Engineering Range.
The plot range setting is effective to the scales on the Trend view, the Bargraph view and bargraphs on the Overview.
For the R1M-P4, specify ‘1e9.’
For example, if you have a temperature input:
This is the most common setting. Eng. Range and Plot Posi-
tion values are the same. Scales are -270
°
C at the left edge,
1370
°
C at the right edge of the chart.
This is used when you want to enlarge a particular section of
the Eng. Range. The chart is used only for a narrower range of
1000
°
C, between 0
°
C at the left edge and 1000
°
C at the right
edge, against the 1640
°
C full-scale.
The plot range of a particular channel can be reflected on the scale bar (engineering unit scale). For example, if you
have a plot range of 0 (lower limit) to 1000 (upper limit), the scale bar shows 0, 100, 200 .... 900, 1000, the full-scale
range (0 to 1000) divided by ten.
If you need fractions to be included, specify the both ranges with decimal point. For example, if you have a plot
range of 0 (lower limit) to 0.20 (upper limit), the scale bar shows 0, 0.02, 0.04 .... 0.18, 0.20 (Figure 3.16.2h). If you
need three decimal points, set the upper limit to 0.200. Max. three decimal points can be displayed with perpendicu-
lar chart, and max. one decimal point with horizontal chart.
Max. six (6) digits of number can be entered in the plot range field. However, a part of the digits may not be shown
due to limited screen area. In such a case, adjust the range by adding prefix such as ‘m,’ ‘
µ
,’ ‘k,’ and ‘M’ to the
engineering unit field and reduce the number of digits in the plot range field.
For example, if you have a plot range of ‘100000 to 500000’ as
shown in the table to the left, a few zeros may not be displayed.
Then we suggest that you would change the engineering unit
and the plot range as shown to the table to the left. The full-
scale plot range value ‘500000 Pa’ is converted into ‘0.5 MPa.’
Than add two decimal points so that you still have data of rela-
tively good resolution.
The scale setting is similar if ‘Logarithmic’ plotting is chosen. For example, if you have 1 for the exponential scale,
and 4 for the log. plot position exponent, the lower plot range is 10 and the upper is 100000.
Normal / Logarithmic
When Normal plotting is selected, the plot area is divided equally. When Logarithmic is selected, the plot area is
divided in specified scale of exponents of 10.
For Logarithmic plotting, specify the lower limit of exponent in ‘Logarithmic Plot Position Exponent’ field within -9 to
8, and how many divisions you wish to have in ‘Exponential Scale’ among 10, 5, 4, 2, and 1.
This option can be changed while recording.
For example, when the Exponential Scale is set to 10 and the Logarithmic Plot Position Exponent is et to -4, the chart
scale appears as shown in Figure 3.16.2h.
Figure 3.17.2h: Logarithmic scale example.
Square Root
Input data is square-root-extracted when this setting is enabled.
UNIT
LOWER LIMIT
UPPER LIMIT
Scaled Range
°
C
-270
1370
Plotted Range
°
C
-270
1370
UNIT
LOWER LIMIT
UPPER LIMIT
Scaled Range
°
C
-270
1370
Plotted Range
°
C
0
1000
UNIT
LOWER LIMIT
UPPER LIMIT
Scaled Range
Pa
100000
500000
Plotted Range
Pa
100000
500000
UNIT
LOWER LIMIT
UPPER LIMIT
Scaled Range MPa
0.1
0.5
Plotted Range Mpa
0.1
0.50
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