3B17 Wide Bandwidth, LVDT/RVDT Input

简介

Model 3B17-02The 3B17 is a wide-bandwidth single-channel signal- conditioning module which isolates, amplifies, and filters signals from 4-, 5-, or 6-wire Linear Variable Displacement Transformers (LVDTs) or Rotary Variable Displacement Transformers (RVDT). The 3B17 input module provides an AC excitation voltage of 1 V rms to 5 V rms at frequencies between 1 kHz and 10 kHz. All gain and zero suppression can be user-calibrated by screwdriver adjustments through the sliding door on the top of the module. Gain can vary over an extensive 256:1 range by adjusting a combination of a rotary switch and trim potentiometer. Zero suppression can vary over ±5 V from the center setting. The current output can be independently adjusted over a ±5% range for zero and span. In addition, the 3B17 is mix-and-match and hot-swappable with all 3B Series modules, so it can be inserted or removed from any socket in the same backplane without disrupting system power.

3B Series Custom-Ranging Program

Externally-programmable versions, Models 3B17-00 and 3B17-D-00, enable the user to configure a special input range, excitation voltage and excitation frequency by using the optional plug-on AC1310 ranging card, which houses user-supplied resistors to determine excitation voltage amplitude and frequency. To facilitate selecting resistors, a Windows® program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges and AC excitation.

Inside the 3B17 Series Module

The 3B17 input and AC excitation output terminals are protected for up to 130 V rms, protecting the computer side from damage due to field-side overvoltage faults. The LVDT input signal is amplified to give the high level output voltage. The 3B17 automatically compensates for phase errors between the primary and secondaries of the LVDT or RVDT, eliminating the need for a phase adjustment, and automatically rejects any residual quadrature voltages via a unique approach to error compensation which uses the sum of the two secondary windings to directly drive the demodulator. The amplitude and frequency of the AC excitation can be factory configured to meet custom needs (Model 3B17-CUSTOM) or externally configured (Models 3B17-00 and 3B17-D-00) with the optional AC1310 plug-on custom ranging card.

输入和输出范围

3B17 Functional Block Diagram
Figure 1. 3B17 Functional Block Diagram

3B17 Input Field Connections
Figure 2. 3B17 Input Field Connections

Input Type
Dual Outputs
4-, 5- or 6-Wire
-10 V to +10 V
LVDT or RVDT Transducers
4 mA to 20 mA or 0 to 20 mA

3B17型号一览表


Model  Excitation 
Voltage
Excitation 
Frequency
Output 
Ranges
1
Order Now 3B17-003B17-013B17-023B17-033B17-043B17-Custom
* *
*
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3B17-D-00
Externally Programmable2
Externally Programmable2
-10 V to +10 V & 0 mA to 20 mA
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3B17-D-01
3 V rms
2.5 kHz -10 V to +10 V & 0 mA to 20 mA
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3B17-D-02
5 V rms
5 kHz
-10 V to +10 V & 0 mA to 20 mA
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3B17-D-03
5 V rms
7.5 kHz
-10 V to +10 V & 0 mA to 20 mA
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3B17-D-04
1 V rms
10 kHz
-10 V to +10 V & 0 mA to 20 mA

1 Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.
2 Requires AC1310 ranging card.
* Custom Input/Output ranges are available. Refer to configuration guide.

3B17规格

(在+25°C、±15 V直流和+24 V直流电源下的典型值)

说明 3B17 型号
输入范围
类型 4、5、6线LVDT或RVDT,包括差分线圈
标准范围
20 mV rms至5 V rms;激励电压和频率参见型号表
自定义激励
Vexc = 1 V rms 至 5 V rms
Vexc 频率 = 1 kHz 至 10 kHz
输出范围
电压(RL > 2 KΩ)
-10 V 至 +10 V
电流 (RL = 0 to 850Ω)1
4 mA 至 20 mA 或 0 mA 至 20 mA
带输入过载功能
40 mA, 最大值
精度2
初始(+25°C)
跨度的±0.1%
非线性度2
跨度的±0.05%
稳定性与温度的关系
电压输出
零点 跨度的±0.005%/°C
   跨度 跨度的±0.01%/°C
电流输出3
零点 跨度的±25 ppm/°C
跨度 读数的±25 ppm/°C
LVDT 激励4
电压
1 V rms 至 5 V rms
电压容差
±10%
频率 1 kHz 至 10 kHz, ±15%
驱动 20 mA rms, 最大值
谐波失真 < 0.5%
电压输出校准4
电压输出校准 256:1
零点调整范围 ±5 V
电流输出校准4
电流输出校准
跨度的±5%
输入偏置电流
+1 µA
输入电阻
100 MΩ
-3 dB带宽5
100 Hz
输出上升时间(10%至90%跨度)
5 ms
输入保护、信号和激励电压
连续
130 V rms 最大值
瞬变 ANSI/IEEE C37.90.1-1989
电压输出保护 连续短路至地
连续短路至地
130 V rms, 连续
电源电压6
±15 V dc 直流电源
额定工作电压 ±(13 V dc 至 18 V dc)
电流 ±65 mA + LVDT电流7 7
灵敏度 跨度的±0.03%/V
+24 V直流环路电源
额定工作电压 +13.5 V dc 至 +30 V dc

电流 +27 mA @ lout = 20 mA
灵敏度 跨度的±0.001%/V
机械尺寸
3.15" x 3.395" x 0.775"
80.0 mm x 86.2 mm x 19.7 mm)
环境
温度范围
额定性能 -25°C 至 +85°C
存储 -55°C 至 +85°C
相对湿度,24小时
0至95%(+60°C非冷凝)
RFI耐受性
±0.5%跨度误差(400 MHz,5 W,3 ft)

1对于0 mA至20 mA范围,典型最小输出电流为10 µA。
2包括可重复性、迟滞和非线性度的组合效应。
3相对于电压输出。
4利用AC1310范围调整卡,3B17-00型号提供宽范围的自定义零抑制和跨度。
5订购3B17-custom型号时,带宽最高可设置为激励频率的1/10。
6驱动最高850Ω的电流输出负载需要+24 V直流环路电源。 如果电流输出负载不大于400Ω,+15 V直流环路电源即足够。 若仅使用电压输出,则无需环路电源。
7典型电源电流是每个模块±40 mA加上LVDT驱动电流±5 mA。 要从LVDT电流计算电源电流要求,应使用75%的LVDT均方根电流。

规格如有变更恕不另行通知。