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參數(shù)資料
| 型號(hào)： | 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(jì)。 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | DIV100 |
10
DIV100
more active arms whose resistance is a function of the
physical quantity, property, or condition that is being mea-
sured; e.g., force of compression. For the sake of explana-
tion, the bridge in Figure 13 has only one active arm.
The differential output voltage V
BA
is:
V
BA
= V
B
– V
A ,
a nonlinear function of the resistance change in the active
arm. This nonlinearity limits the useful span of the bridge to
perhaps
±
10% variation in the measured parameter.
Bridge linearization is accomplished using the circuit in
Figure 14. The instrumentation amplifier converts the differ-
ential output to a single-ended voltage needed to drive the
divider. The voltage-divider string makes the numerator and
denominator voltages:
–V
EX
δ
R
IN
(2R
1
+ 3R
IN
)(2 +
δ
)
2V
EX
R
ID
(2R
1
+ 3R
ID
)(2 +
δ
)
N =
; and,
D =
, respectively,
where:
R
IN
= DIV100 numerator input resistance
R
ID
= DIV100 denominator input resistance
Applying these voltages to the DIV100 transfer function
gives:
(2R
+ 3R
)(R
δ
) 10
(2R
1
+ 3R
IN
)(2R
ID
)
V
O
= 10N/D = ,
which reduces to:
V
O
= –5
δ
if the divider’s input resistances are equal.
FIGURE 11. Percentage Computation.
V
O
= V
X
100
B
(V
A
–V
B
)
Standard
DIV100
V
B
N
D
Measured
Variable
V
A
G = 10
Instrumentation
Amplifier
(1% per volt)
FIGURE 12. Time Averaging Computation Circuit.
FIGURE 13. Bridge Circuit.
R
R
R
R
S
= R (1 +
δ
)
A
B
V
= Excitation
Voltage
FIGURE 14. Bridge Linearization Circuit.
FIGURE 10. Ratio Control of Water to Hydrochloric Gas.
–V
EX
δ
R
R
R
R
= R(1 +
δ
)
V
O
DIV100
N
D
Instrumentation
Amplifier
2R
1
R
1
R
1
2R
1
+V
EX
R
1
= 1k
V
A
V
B
G = 1V/V
Ramp
Generator
DIV100
N
D
Integrator
X
Reset
Control
V
OUT
= X = 1
T
O
T
Σ
Flow-Ratio
Receiver-Controller
F
r
C
DIV100
Measurement
and Transmission
Controller
Measurement
and Transmission
Final
Control
Element
Process
Primary Flow
Transmitter
(uncontrolled flow)
Anhydrous
Hydrochloric Gas
Secondary Flow
Transmitter
(controlled flow)
Water
Absorption Tower
Liquid
Hydrochloric
Acid
Manual
Ratio-Setting
Control Signal
Primary Variable
(uncontrolled)
Error
Secondary Variable
(controlled)
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