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參數(shù)資料
| 型號(hào)： | MODEL 5B42 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Process Current Input Module(電流輸入轉(zhuǎn)換處理模塊) |
| 中文描述： | 過程電流輸入模塊（電流輸入轉(zhuǎn)換處理模塊） |
| 文件頁數(shù)： | 1/2頁 |
| 文件大小： | 59K |
| 代理商： | MODEL 5B42 |
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
MODEL 5B42
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1997
Process Current
Input Module
FUNCT IONAL BLOCK DIAGRAM
GE NE RAL DE SCRIPT ION
Model 5B42 interfaces with 2-wire transmitters to convert their
4-to-20 mA process current signal into a high accuracy output of
+1 V to +5 V or +2 V to +10 V. T he module provides 1500 V
isolation with 140 dB CMR, 20 V regulated loop power (at a
4-to-20 mA loop current), signal filtering, and input protection
against accidental line voltage connection. T he industry standard
5B Series encapsulated plug-in modular package is compatible with
all 5B backplanes. Modules are powered by +5V dc,
±
5%.
Signal isolation is provided by transformer coupling using a propri-
etary technique for linear, stable performance. A demodulator
on the output side of the signal transformer recovers the input
signal, which is filtered and buffered to provide an accurate, low
impedance, low noise output.
FEATURES
Accepts 4-to-20 mA Process Current Input Signal
Provides Isolation and Regulated 20 V DC Loop
Power for Nonisolated 2-Wire Transmitters
+1 V to +5 V or +2 V to +10 V Output
1500 V rms Input/Output and Input/Power Isolation
250 V rms Output/Power Isolation
140 dB Common-Mode Rejection
100 Hz Signal Bandwidth
Accuracy:
6
0.05%
Linearity:
6
0.01%
240 V rms Field Wiring Protection
Protected Internal Current Sense Resistor
ANSI/IEEE C37.90.1-1989 Transient Protection
CSA, FM and CE Approvals
T rue three-port isolation includes common-mode voltage of:
1500 V rms between input and output, and between input and
power; 250 V rms between output and power.
Accurate performance is maintained over a wide –40
°
C to
+85
°
C operating temperature range. T he 5B42’s low drift
design achieves an output offset drift of only
±
5
μ
V/
°
C and gain
drift of
±
25 ppm/
°
C.
T he 5B42 offers significant advantages over signal condition-
ers that require an external current sense resistor. An external
resistor is not protected from accidental connection to ac line
voltages, and its error tolerance must be added to the conditioner’s
specified errors.
T he 5B42 is trimmed and specified including its internal 25
current-sense input resistor. T he 5B42 signal input, loop supply
and the sense resistor are all protected against accidental appli-
cation of voltages, such as an ac power line, up to 240 V rms
continuous. T here is no need to install an external resistor on
the backplane, but if one is installed, it has no effect on the
5B42 performance.
T he module has a –3 dB bandwidth of 100 Hz, an optimized
5-pole signal filter with low overshoot and exceptional output
noise performance of 200
μ
V peak-to-peak at 100 kHz bandwidth.
T he 5B42 logic-controlled series output switch eliminates the
need for external multiplexing in many applications. T his low
output resistance switch is controlled by an active low enable
input. When the output switch is not used, ground the enable
input to I/O common to turn on the switch.
ACTIVE
4-POLE
LPF
ISOLATED
FIELDSIDE
POWER
V
OUT
I/O
COM
RD
EN
+5V
PWR
COM
2-WIRE
TRANSMITTER
5B
BACKPLANE
5B42
POWER
OSCILLATOR
AMP
ISOLATED
OUTPUT-
SIDE
POWER
4
6
5
3
LPF
P
–
REGULATED
LOOP
SUPPLY
17
16
ISOLATION
22
20
19
ISOLATED OUTPUT SECTION
ISOLATED INPUT SECTION
+
–
+
25
V
+EXC
+IN
4
3
2
1
+
–
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