The **FRTS-D4-R** is an electronic component primarily classified as a **Rotary Torque Sensor** (often used in industrial automation, robotics, and testing equipment). It is designed to measure torque on rotating shafts using strain gauge technology. --- ## 1. Core Technical Specifications The following table highlights the typical electronic and mechanical characteristics of the FRTS-D4-R series: | Parameter | Specification | | :--- | :--- | | **Sensor Type** | Strain Gauge (Wheatstone Bridge) | | **Rated Capacity** | Typically 0.5 N·m to 10 N·m (varies by model) | | **Output Signal** | Analog (approx. 1.0 to 1.5 mV/V) | | **Excitation Voltage** | 5V to 10V DC | | **Non-linearity** | ±0.5% R.O. (Rated Output) | | **Connection Type** | Slip ring or Wireless (depending on sub-variant) | --- ## 2. Key Electronic Components The internal architecture of the FRTS-D4-R consists of several critical electronic stages: ### A. Strain Gauges The "heart" of the sensor. These are foil resistors bonded to a sensing element. When torque is applied, the metal deforms slightly, changing the resistance of the gauges. ### B. Wheatstone Bridge Circuit The strain gauges are wired in a **Wheatstone Bridge** configuration. This circuit is essential because: * It converts tiny changes in resistance into a measurable voltage. * It provides temperature compensation to prevent thermal expansion from being misread as torque. ### C. Slip Ring Assembly (Standard R-Series) Since the shaft rotates while the housing remains stationary, the FRTS-D4-R uses a **slip ring** (electromechanical brushes) to: 1. Supply the DC excitation voltage to the rotating bridge. 2. Retrieve the millivolt signal from the rotating shaft to the fixed output connector. --- ## 3. Wiring Configuration The device typically uses a shielded 4-wire or 6-wire system to maintain signal integrity against Electromagnetic Interference (EMI). ```yaml Pin Color | Function | Description ----------|---------------|----------------------- Red | Excitation + | Positive Input Voltage Black | Excitation - | Negative Input Voltage (Ground) Green | Signal + | Positive Torque Output White | Signal - | Negative Torque Output Shield | Ground | Noise Reduction ``` --- ## 4. Application Context The FRTS-D4-R is used in electronic testing environments such as: * **Motor Testing:** Measuring the efficiency of small DC/AC motors. * **Screw Tightening:** Monitoring the torque of automated electric screwdrivers. * **Haptic Feedback:** Calibrating the resistance of electronic knobs and switches.