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| 型號： | DIV100 |
| 英文描述： | DIV100 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | DIV100 -已停產(chǎn)產(chǎn)品。不再推薦用于新設(shè)計。 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 160K |
| 代理商： | DIV100 |
9
DIV100
The adjustment procedure is:
1. Begin with R
1
, R
2,
and R
3
set to their mid-position.
2. With |N| = D = 10.000V,
±
1mV, adjust R
1
for
V
O
= +10.000V,
±
1mV. This sets the scale factor.
3. Set D to the minimum expected denominator voltage.
With N = –D, adjust R
for V
= –10.000V. This adjusts
the output referred denominator offset errors.
4. With D still at its minimum expected value, make N =
D. Adjust R
3
for V
O
= 10.000V. This adjusts the output
referred offset errors.
5. Repeat steps 2-4 until the best accuracy is obtained.
FIGURE 7. Connection Diagram for Optional Adjustments.
TYPICAL APPLICATIONS
CONNECTION DIAGRAM
Figure 8 is applicable to each application discussed in this
section, except the square root mode.
FIGURE 8. Connection Diagram—Divide Mode.
RATIOMETRIC MEASUREMENT
The DIV100 is useful for ratiometric measurements such as
efficiency, elasticity, stress, strain, percent distortion, im-
pedance magnitude, and fractional loss or gain. These ratios
may be made for instantaneous, average, RMS, or peak
values.
The advantage of using the DIV100 can be illustrated from
the example shown in Figure 9.
The LVDT (Linear Variable Differential Transformer) weigh
cell measures the force exerted on it by the weight of the
material in the container. Its output is a voltage proportional
to:
W =
where: W = Weight of material
F = Force
g = Acceleration due to gravity
a = Acceleration (acting on body of weight W)
Fg
a
FIGURE 9. Weighing System - Fractional Loss.
LVDT
Weigh
Cell
Force
Container
DIV100
N
Sample/
Hold
W
INITIAL
Control Signal
D
V
OUT
W
INSTANTANEOUS
In a fractional loss weighting system, the initial value of the
material can be determined by the volume of the container
and the density of the material. If this value is then held on
the D-input to the DIV100 for some time interval, the
DIV100 output will be a measure of the instantaneous
fractional loss:
Loss (L) = W
INSTANTANEOUS
/W
INITIAL
Note that by using the DIV100 in this application the
common physical parameters of g and a have been elimi-
nated from the measurement, thus eliminating the need for
precise system calibration.
The output from a ratiometric measuring system may also be
used as a feedback signal in an adaptive process control
system. A common application in the chemical industry is in
the ratio control of a gas and liquid flow as illustrated in
Figure 10.
PERCENTAGE COMPUTATION
A variation of the direct ratiometric measurements previ-
ously discussed is the need for percentage computation. In
Figure 11, the DIV100 output varies as the percent deviation
of the measured variable to the standard.
TIME AVERAGING
The circuit in Figure 12 overcomes the fixed averaging
interval and crude approximation of more conventional time
averaging schemes.
BRIDGE LINEARIZATION
The bridge circuit in Figure 13 is fundamental to pressure,
force, strain and electrical measurements. It can have one or
9
13
14
3
10
DIV100
2
1
+V
CC
R
LOAD
≥
2k
V
OUT
R
SOURCE
R
SOURCE
R
SOURCE
<
10
–V
CC
N
D
R
2
10k
10M
–V
CC
+V
CC
13
9
14
3
10
11
12
4
DIV100
1
2
+V
CC
V
O
= 10N/D
–V
CC
R
1
20k
1.5M
R
3
10k
10M
–V
CC
+V
CC
D
N
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