參數(shù)資料
型號: LM363
廠商: National Semiconductor Corporation
元件分類: 運動控制電子
英文描述: LM363 Precision Instrumentation Amplifier
中文描述: LM363精密儀表放大器
文件頁數(shù): 16/22頁
文件大?。?/td> 452K
代理商: LM363
Typical Applications
(Continued)
Curvature Corrected Platinum RTD Thermometer
TL/H/5609–23
*
70k and 2k should track to 5 ppm/
§
C
**
Less than 5 ppm/
§
C drift
2
Less than 100 ppm/
§
C drift
22
These resistors should track to 20 ppm/
§
C
3
Equivalent circuit, showing lead resistance
This thermometer is capable of 0.01
§
C accuracy over
b
50
§
C to
a
150
§
C. A unique trim arrangement eliminates cumbersome trim inter-
actions so that zero, gain, and nonlinearity correction can be trimmed in
one oven trip. Extra op amps provide full Kelvin sensing on the sensor
without adding drift and offset terms found in other designs. A2 is con-
figured as a Howland current pump, biasing the sensor with a fixed
current.
Resistors R2, R3, R4 and R5 from a bridge driven into balance by A1. In
balance, both inputs of A1 are at the same voltage. Since R6
e
R7, A1
draws equal currents from both legs of the bridge. Any loading of the
R4/R5 leg by the sensor would unbalance the bridge; therefore, both
bridge taps are given to the sensor open circuit voltage and no current
is drawn.
Precision Temperature Controller
TL/H/5609–24
*
Ultronix 105A wirewound
Thermistor
e
Yellow Springs
Y
44032
Setpoint stability
e
2.5X10
b
4
§
C/Hr
16
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