3B31 [ADI]

Isolated Voltage Input; 隔离电压输入


型号：	3B31
厂家：	ADI
描述：	Isolated Voltage Input 隔离电压输入
文件：	总8页 (文件大小：355K)
中文：	中文翻译
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Isolated Voltage Input

3B30 / 3B31

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Interfaces, amplifies, & filtersanalog input voltages.

Narrow-bandwidth (3Hz) single-channel single

conditioning.

Module provides simultaneous precision voltage and

current outputs.

Module circuitry can withstand 220v rms at the input screw-

terminals

Current output withstands 130V rms without damage.

All 3B30 & 3B31 series modules are mix-and-match and Hot

Swappable

Figure 1. 3B30 & 3B31 Functional Block Diagram

Output modules accept 0 to +10V (or +10V) single-ended

signals and provide an isolated 4-20 mA (or 0-20 mA) process

signal. All modules feature a universal pin-out and may be

readily hot-swapped under full power and interchanged without

disrupting field wiring.

APPLICATIONS

Industrial signal conditioning

Industrial signal isolation

Industrial signal filtering

The Analog Devices 3B Series Signal Conditioning Subsystem is

designed to easily handle signal conditioning problems in

measurement and control applications. Some typical uses are in

microcomputer-based data acquisition systems, programmable

controllers, analog recorders, dedicated control systems, and any

other applications where monitoring of temperature, pressure,

flow and analog signals are required. Since each input module

features two simultaneous outputs, the voltage output can be

used to provide an input to a microprocessor-based data

acquisition or control system while the current output can be

used for analog transmission, operator interface, or an analog

backup system.

PRODUCT OVERVIEW

The 3B Series of Signal Conditioning I/o Subsystems provide a

low-cost, versatile method of transferring analog transducer

signals to a data acquisition, monitoring or control system

without the inherent noise, non-linearity, drift and extraneous

voltages. The modules are designed to directly accept analog

signals from Thermocouples, RTD’s, AC and DC Strain Gages,

Torque Transducers, Frequency Transducers, LVDTs, millivolt

or process current signals. The modules amplify, isolate,

linearize and convert the transducer output signals to

standardized analog inputs for high-level analog I/O

subsystems. The 3B Series Subsystem consists of a 10” relay

rack with universal mounting backplane and a family of plug-in

(up to 16 per rack) input and output signal conditioning

modules.

Each input module is a single-channel signal conditioner which

plugs into a socket on the backplane and accepts its signal from

the input screw terminals. All input modules provide input

protection, amplification and filtering of the input signal,

accuracy of +0.1%, low drift of +1 uV/^oC (low-level input

modules), and feature two high-level analog outputs that are

compatible with most process instrumentation. The isolated

input modules also provide +1500 V peak isolation.

Eight and four channel backplanes are also available. Each

backplane incorporates screw terminals for sensor inputs and

current outputs and a 26-pin connector for high-level single-

ended voltage outputs to the user’s equipment.

The input modules feature complete signal conditioning

circuitry optimized for specific sensors or analog signals and

provide two simultaneous high-level analog outputs: 0 to +10V

(or +10V) and 4-20 mA (or 0-20 mA).

The choice of a specific 3B module depends upon the type of

input signal. Input modules are available to accept millivolt, volt,

process current, thermocouple, RTD, AC and DC strain gage,

frequency and LVDT inputs. The voltage output of each module

is available from the system I/O connector while the current

output is available on the output screw terminals.

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

3B30 / 3B31

GENERAL DESCRIPTION

set the zero-scale value. Zero suppression can exceed 100% of

the input range. This is ideal fro expanded-scale applications

requiring high-resolution measurement of a selected portion of

an input signal. For users convenience, the zero and span can be

factory configured to meet custom range needs (Models 3B30-

CUSTOM and 3B31-CUSTOM) or can be externally

programmed (Models 3B30-00 and 3B31-00) via user supplied

resistors inserted in the optional AC1310 plug-on ranging card.

Internal low-pass filtering with a 4Hz cutoff (-3dB) two-pole

Butterworth filter enhances both 60dB normal-mode and 160

dB common-mode rejection at 50/60 Hz, enabling accurate

measurement of small signals in high electrical noise.

The 3B30 & 3B31 are narrow-bandwidth (3Hz) single-channel

signal conditioning modules which amplify, isolate, filter and

protect analog input voltages and provide simultaneous

precision voltage and current outputs. Each module performs

complete signal conditioning, including isolating (+1500V peak

input-to-output and power) and protecting their computer side

outputs from damage and loss of signal integrity, and shielding

their inputs from damage from field-side over-voltage faults up

to 220V rms. The current output withstands 130V rms without

damage and interfaces user equipment through screw terminals

located on the 3B Series backplane. Each plug-in, mix-and-

match, hot-swappable module is easily field calibrated via front-

panel zero and span adjustments for both voltage and current

outputs.

Signal isolation is accomplished by transformer coupling with a

proprietary modulation technique for linear, stable and reliable

performance. The differential input circuit on the field side is

fully floating, eliminating the need for any input grounding. A

demodulator on the computer side of the signal transformer

recovers the original signal, which is then filtered and buffered

to provide a low-noise, low-impedance output voltage; this

output also drives a voltage-to-current (V/I) converter to

provide a simultaneous current output for interfacing versatility.

3B Series Custom-Ranging Program – Externally-

programmable Models 3B30-00 and 3B31-00, enable the user to

configure a special input range by using the optional plug-on

AC1310 ranging card, which houses user-supplied resistors to

determine zero and span. To facilitate selecting resistors, a

Windows program, 3B-CUSTOM, calculates resistor values

based on the user-desired input/output ranges.

A chopper-stabilized low-drift (+1uV/^oC) input amplifier

assures stable long-term stability. At the amplifier input, a stable,

zero-scale input voltage is subtracted from the input signal to

Figure 2

Rev. 0 | Page 2 of 8

3B30 / 3B31

3B30 and 3B31 Models Available

Model

Input Range

Externally Programmable²

-10 mV to +10 mV

-50 mV to +50 mV

-100 mV to +100 mV

Output Ranges¹

3B30-00

-10 V to +10 V & 0 mA to 20 mA

3B30-01

3B30-02

3B30-03

3B30-Custom

3B31-00

Externally Programmable²

-1 V to +1 V

-10 V to +10 V & 0 mA to 20 mA

3B31-01

3B31-02

-5 V to +5 V

3B31-03

-10 V to +10 V

3B31-Custom

¹Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.

²Requires AC1310 ranging card.

* Custom Input/Output ranges are available. Refer to configuration guide.

3B30 and 3B31 Specifications

(typical @ +25°C and ±15 V dc, and +24 V dc Power)

Description

Model 3B30

Model 3B31

Input Range

Standard Ranges

Custom Ranges

±10 mV to ±100 mV

±5 mV to ±500 mV

±1 V to ±10 V

±0.5 V to ±20 V

Output Range

-10 V to +10 V

Voltage (R_L> 2 KΩ)

Current (R_L= 0 to 850Ω)¹

Maximum Current Output Span

4 mA to 20 mA or 0 mA to 20 mA

0 mA to 31 mA

Accuracy²

Initial @ +25°C

Nonlinearity

±0.1% Span

±0.01% Span

Stability vs. Temperature

Voltage Output

Zero

±1 µV/°C (RTI)

±25 ppm of Span/°C

Span

±25 ppm of Reading/°C

Current Output³

Zero

±25 ppm of Span/°C

±25 ppm of Reading/°C

±5% of Span

Span

Zero and Span Adjustment Range⁴

Rev. 0 | Page 3 of 8

3B30 / 3B31

Input Bias Current

Input Resistance

+3 nA

15 MΩ

650 kΩ

Noise

Input, 0.1 Hz to 10 Hz Bandwidth

Output, 100 kHz Bandwidth

Bandwidth, -3 dB

0.2 µV rms

50 µV rms

3 Hz

Output Rise Time, 10% to 90% Span

200 ms

Common-Mode Voltage (CMV)

±1500 V peak, maximum

ANSI/IEEE C37.90.1-1989

Common Mode Rejection (CMR)

Input-to-Output, Continuous

Transient

160 dB

1 kΩ Source Imbalance, 50/60 Hz

150 dB (3B31-02); 145 dB (3B31-03)

Normal Mode Rejection, 50/60 Hz

60 dB

Input Protection

Continuous

220 V rms maximum

Transient

ANSI/IEEE C37.90.1-1989

Continuous Short to Ground

130 V rms, continuous

Voltage Output Protection

Current Output Protection

Power Supply Voltages ⁵

±15 V dc Supplies

Rated Operation

Current

±(11.5 V dc to 16.5 V dc)

±10 mA

Sensitivity

±0.01% span/V

+24 V dc Loop Supply

Rated Operation

Current

+12 V dc to +30 V dc

+27 mA @ l_out= 20 mA

±0.0002% span/V

Sensitivity

Mechanical Dimensions

3.15" x 3.395" x 0.775"

80.0 mm x 86.2 mm x 19.7 mm)

Environmental

Temperature Range

Rated Performance

Storage

-25°C to +85°C

-55°C to +85°C

Relative Humidity, 24 hours

RFI Susceptibility

0 to 95% @ +60°C non-condensing

±0.5% Span error @ 400 MHz, 5 Watt, 3 ft

* Specifications same as model 3B30.

¹For a 0 to 20 mA range, a typical minimum output current is 10 µA.

²Includes the combined effects of repeatability, hysteresis, and nonlinearity.

³With respect to the voltage output.

⁴A wide range of custom zero suppression and span is available with the 3B30-00 and 3B31-00 models, using the AC1310 ranging card.

⁵+24 V dc loop power is required for driving the current output at loads up to 850Ω. If a current output load of 400Ω or less is applied, +15 V dc is sufficient for loop power. If only

voltage output is used, loop power is not required.

Specifications subject to change without notice.

Rev. 0 | Page 4 of 8

3B30 / 3B31

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

Figure 3 3B30 & 3B31Input Field Connections

Table 1. Pin Function Descriptions—

Pin No.

Description

n/c

Figure 4 . Model 3B Series Module, with pin-out assignments.

n/c

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human

body and test equipment and can discharge without detection. Although this product features proprietary ESD

protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges.

Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

Rev. 0 | Page 5 of 8

3B30 / 3B31

OUTLINE DIMENSIONS

Figure 5. Outline Dimensions

Rev. 0 | Page 6 of 8

3B30 / 3B31

NOTES

Rev. 0 | Page 7 of 8

3B30 / 3B31

NOTES

registered trademarks are the property of their respective companies.

D05093-0-9/04(0)

Rev. 0 | Page 8 of 8

3B31 [ADI]

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