3B17 Wide Bandwidth, LVDT/RVDT Input

The 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.

Figure 1. 3B17 Functional Block Diagram

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

	Model	Excitation  Voltage	Excitation  Frequency	Output  Ranges1
Order Now	3B17-003B17-013B17-023B17-033B17-043B17-Custom	*	*	*
Order Now	3B17-D-00	Externally Programmable2	Externally Programmable2	-10 V to +10 V & 0 mA to 20 mA
Order Now	3B17-D-01	3 V rms	2.5 kHz	-10 V to +10 V & 0 mA to 20 mA
Order Now	3B17-D-02	5 V rms	5 kHz	-10 V to +10 V & 0 mA to 20 mA
Order Now	3B17-D-03	5 V rms	7.5 kHz	-10 V to +10 V & 0 mA to 20 mA
Order Now	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.

（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）