Accuracy
Accuracy is the difference between the indicated value and the actual value at room temperature. In most cases, accuracy consists of two main sources of error: resolution and linearity. In order to
estimate the desired accuracy of a measurement device, the square root of the sum of squares method is used to synthesize the individual sources of error.
Analog Output
The analog output of a sensor is a continuous output of the measured change. The output can be in the form of 4-20mA, 0-10V or other forms.
Beam Angle
An ultrasonic transducer emits a conical beam of acoustic energy that disperses with distance. The angle of the beam is usually defined as the angle. Ultrasonic beams are not perfectly tapered.
Most of the ultrasonic energy is located in the center of the beam. The farther away from the centerline, the less energy there is. The beam angle is defined as the boundary where the energy is 50% of the centerline energy.
Color Sensitivity
For MACHER's optical sensors, color sensitivity is the change in output value when the color of the target object changes. For example, as the target object changes from bright white to almost black, the L - GAGE LG5 will change by less than 75µm, from nearly 90% reflectance to 10% reflectance. Note that for very precise measurements, Mach uses precise ceramic target objects as a base, rather than Kodak's standard cardboard target objects.
Blind Zone (Dead Zone)
Blind zones are areas where the sensor cannot make a measurement. For example, the Mach ultrasonic sensors R18VUT, R30UVT have a blind zone of several tens of millimeters. This means that the sensor will ignore all objects within a few millimeters of the sensor surface. Properly mounted components ensure that the target object to be detected is always within the measuring range.
DEVICENET
DeviceNet is a bus type of wiring, especially for automated operation of sensors: it allows data exchange between sensors and controllers over a single cable.
The DEVICENET DeviceNet It is much like a LAN that connects PCs.
Switching outputs
Mach switching outputs for proximity sensors and photoelectric sensors are on-off outputs that signal when a continuous measurement has reached a specific value. The switching outputs are specifically labeled as NPN outputs or PNP outputs, transistors or electro-mechanical relays.
Voltage Drop Resistors
A voltage drop resistor, also known as a load resistor, is a precision resistor that is used to convert a 4 - 20mA current signal into a voltage signal. The most common voltage drop resistor
The most common voltage drop resistor is 250Ω + 0.025Ω, which converts current to a 1V - 4V signal. For good temperature stability, the dropout resistor should have a temperature coefficient of 0.01% / ˚C or better.
temperature coefficient.
Frequency Response
Frequency response refers to the maximum frequency that an analog sensor can track. All analog sensors have an inherent response time that limits their ability to measure cyclic motion at high frequencies.
This limits their ability to measure cyclic motion at high frequencies. For example, suppose a laser displacement sensor with a 1.6ms response time is measuring the deflection runout of a rotating cylinder. Since the laser sensor is
Since the laser sensor is averaged over a 1.6ms period, it will be below the peak amplitude record. This error will increase as the rotational speed increases.
Specifically, this error is specified as the rotational speed that produces a -3dB error (-3dB equals 30% error). For a 1.0ms period, the -3dB response frequency is 450Hz.
At 250Hz, a displacement of 1.0mm will be reported as 0.7mm by the laser sensor. For reference, note that the crankshaft speed of an automotive engine running at 300rpm is only 50Hz.
Full Scale
The full scale range of the sensor represents the maximum possible measurement range. For example, a laser displacement sensor measuring from 75 - 125mm has a full scale range of 50mm.
range. Even if the user has set the sensor to read from 100mm to 120mm, the full scale is still 50mm. Therefore, if the manufacturer identifies the performance statement as “percent of full scale”, keep in mind that it is not the same as “percent of full scale”.
Therefore, it is important to keep this in mind if the manufacturer identifies the performance specification as “percent of full scale”. Errors do not decrease as the calibrated measurement span increases, but if the manufacturer labels the performance statement as “percent of full scale”, the error will decrease.
If the manufacturer identifies the performance specification as a “percentage of full scale”, the error will shrink as the calibrated measurement span increases.
Tolerance
Return difference is often used to indicate the difference in transition points at a switching output. For example, when a target object is at 25mm, the output is on; but when the target object is at 25mm, the output is off.
