概览
4WFBS120 是4线全桥模块，作为单变量电阻为应变计或其它传感器提供桥臂电阻，该模块用于那些有120-Ohm总阻抗的传感器。
优势与特点
- Easy to install or remove
- Connects directly into data logger input terminals
- Compatible with most Campbell Scientific data loggers
图像
3D/CAD 文件：
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技术说明
4WFBS120 是一个4线全桥桥臂模块。可用来组成一个全单臂电桥，亦可用来组成后半段单臂电桥。数据采集器可以测量出电桥电路为输出电压增加阻抗而产生的微小的变化。
4WFBS120 包括2个外部的针，用于分路校正，通常被用来校正比较微弱的误差。
产品规格
| Used With | 4-wire strain gages or other full bridge measurements that have a 120 Ω nominal resistance |
| Dimensions | 1.5 x 1.5 x 2.7 cm (0.6 x 0.6 x 1.0 in.) for body with prongs |
| Weight | 6 g (0.2 oz) |
2:1 Resistive Divider |
|
| Resistance | 1 kΩ/1 kΩ |
| Tolerance | Ratio: ±0.01% (@ 25°C) |
| Maximum Temperature Coefficient | Ratio: 0.5 ppm/°C (-55° to +85°C) |
| Power Rating | 0.1 W (@ 70°C) per element |
Completion Resistor (bulk metal foil) |
|
| Resistance | 120 Ω |
| Tolerance | ±0.01% (@ 25°C) |
| Maximum Temperature Coefficient | 0.8 ppm/°C |
| Power Rating | 0.25 W (@ 70°C) |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR300 | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Miscellaneous
| Product | Compatible | Note |
|---|---|---|
| CR9050 (retired) |
Additional Compatibility Information
Multiplexers
The 4WFBS120 is compatible with our multiplexers.
Data Logger Considerations
The 4WFBS120 uses one differential analog input; an adjacent analog ground channel accepts the "ground prong" of the 4WFBS120. Not all data logger terminal strips have this sequence on all channels, so please check your data logger's wiring panel to confirm channel assignments, especially if you plan to use multiple Terminal Input Modules.
The lead wire that emanates from the head of the 4WFBS120 connects to a data logger excitation channel.
Please note that if a CR10X will be used to measure thermocouples in the same application, newer CR10X Wiring Panels and the CR10XTCR Reference Thermistor (with its accompanying Thermocouple Cover) are deep enough to cover the data logger input channels with a Terminal Input Module attached; older CR10TCRs are not deep enough.
Programming
The 4WFBS120 is measured with the BrFull Instruction in CRBasic, and with Instruction 6 (Full Bridge) in Edlog.
常见问题解答
4WFBS120: 5
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Each data logger has specific excitation current sourcing capability. It is imperative not to exceed this current limit when trying to excite multiple strain gages from the same excitation channel.
- The equivalent resistance of the 4WFBS120 is 214.285 ohm. If the circuit is being excited with 2.5 V (2500 mV), it will draw 11.67 mA (2500 mV / 214.285 ohm = 11.67 mA).
- The equivalent resistance of the 4WFBS350 is 518.518 ohm. If the circuit is being excited with 2.5 V (2500 mV), it will draw 4.82 mA (2500 mV / 518.518 ohm = 4.82 mA).
- The equivalent resistance of the 4WFBS1K is 1000.00 ohm. If the circuit is being excited with 2.5 V (2500 mV), it will draw 2.5 mA (2500 mV / 1000 ohm = 2.5 mA).
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The CR1000 excitation channel current limit is 25 mA at 2500 mV. Using 120 ohm gages with multiple 4WFBS120 modules, only two gages can be hooked up for each excitation channel with 2500 mV excitation. If three gages per excitation channel are used, the excitation needs to be reduced to approximately 1750 mV.
-
More than one strain gage sensor can use the same excitation terminal if the bridge resistance is high enough or the excitation voltage is limited. The limit is determined by the current capacity of the excitation terminal (25 mA at 2.5 V) and the equivalent resistance of the circuit.
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To make strain gage measurements, a terminal input module is needed. It is necessary to match the resistance of the strain gage with the resistance of the terminal input module.
- For a 120 ohm strain gage, use the 4WFBS120.
- For a 350 ohm strain gage, use the 4WFBS350.
- For a 1000 ohm (1 kohm) strain gage, use the 4WFBS1K.
-
The ST350 is designed as a full-bridge strain transducer with four active elements that can be directly connected to a data logger (or a multiplexer connected to a data logger) without adding a completion module such as the 4WFBS350 or 4WFBS120.