Microsoft LPF-00004 Manual del operador Pagina 80

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Page 62 MAKING YOUR OWN ADAPTER OR ACTIVE PROBE
C
YBER
A
MP
380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.
5.000 V
(
4
)
INPUT
(
1
)
INPUT ( 2 )
ANALOG GROUND ( 10 )
SPX
SENSOR
16.1
909
LM334
Figure 28. Temperature compensated pressure sensor. In this circuit, type SPX pressure sensors from
SenSym Corporation are temperature compensated using the type LM334 temperature-dependent current
source from National Semiconductor Corp. The LM334 output current rises linearly with temperature at
+0.336%/°C. The SPX bridge sensitivity decreases linearly with temperature at -0.235%/°C. Resistor R2
reduces the temperature coefficient of the LM334 circuit to provide span compensation of +0.235%/°C.
Resistor R1 sets the current. For details of how R1 and R2 values are calculated, see application note SSAN-16
from SenSym Corporation.
Linear Potentiometers
Rotary Potentiometers
5.000 V
(
4
)
15 V
(
15
)
INPUT
(
1
)
15V
(
8
)
ANALOG GROUND
(
10
)
5.000 V
(
4
)
INPUT
(
1
)
ANALOG GROUND
(
10
)
A
B
Figure 29. Potentiometer interface. This circuit can be used to interface any potentiometer to the CyberAmp.
These could be linear or rotary potentiometers used for displacement measurements, or a hand-turned
potentiometer for special input to a data acquisition program. The minimum value of R is 200 , but typically
much higher values would be used.
A.
Unbuffered circuit. The input impedance of the CyberAmp is 1 M.
For R = 1 k, the non-linearity introduced by the 1 M loading is < 0.1%. For R = 10 k, the non-linearity
introduced by the 1 M loading is < 1%.
B.
For larger R values, a buffer amplifier is recommended.
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