Image Unavailable. Image not available for Color: VIDEOS. Decdeal Health Tape Measure, Digital Tape Measure Accurately Measures Body Part Circumferences Digital Display Shows Result Measurements On Blue. by Decdeal. Available from these sellers.  Ergonomic Design: User-friendly design,specially designed body with arc and delicate 3-key layout which make it operate easier with single hand,comfortable to the touch,and convenient to store. Two Measure Mode: Circumferences mode and linear mode,applied to household items and daily work measurement. Easy and convenient. Date Record: It can store 9 sets of date,sweetly to remind each change even 1mm,great tool for recording weight loss or muscle gain. A tape measure, also called measuring tape, is a type of flexible ruler. Tape measures are made from a variety of materials, including fiber glass, plastic and cloth. They are among the most common measuring tools used today. Generally speaking, the term “tape measure” refers to a roll-up, self-retracting style tape measure that’s designed for carpentry. The actual tape potion of the measure, called the ‘ribbon,’ is usually constructed from a stiff metallic material that can stiffen when needed but can also roll up for simple use and storage. A tape measure is a flexible instrument used for measuring lengths and distances; an essential for many industries and applications. From clothes making to carpentry, DIY and masonry, there is no doubt tape measures are an exceptionally popular tool, available in different types and sizes to suit every need and profession. Despite the variety of shapes and functionalities, most tape measures share a common basic structure, which includes a plastic, steel or fabric strip onto which measurement graduations are marked.  The different applications and environments where the tape measure is needed will determine the best choice among the extensive range of tools available on the market. White enamelled blade - 10mm wide. Download Fitindex app through the app store digital circumference tape measure image Google Play for free also can be cicrumference with Fitindex series scale. Back to home page Return to top. According to the well-known magneto-resistive effect, the resistance of certain objects particularly ferrous ones will change when they are exposed to magnetic fields. They then output a unique multi-bit word of data that indicates the exact position of the shaft.

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Winbag Air Wedge. According to the well-known magneto-resistive effect, the resistance of certain objects particularly ferrous ones will change when they are exposed to magnetic fields.

Most proximity sensors take advantage of this effect by creating a small magnetic field and then detecting when it is interrupted or changed significantly due to the presence of such material.

So when we place such a sensor near a rotating shaft and then affix a ferrous feature onto the shaft that will pass close to the sensor with each revolution, we have a very reliable and accurate speed sensor. The sensor detects the field interruption and outputs a pulse or voltage signal that any DAQ system can display and record. An induction sensor uses magnetic flux changes to detect proximal ferrous objects.

There are also capacitive proximity sensors that can detect non-metallic objects, using the principle of capacitive coupling. Instead of an electromagnetic field, they generate an electrostatic field.

This is detected by the sensor which then creates an output. In the case of both magnetic and capacitive proximity sensors, their sensitivity to the target object can be adjusted. Note: There are also photoelectric sensors that emit light and then detect when it either reflects back or does not. More about those in the Tape Sensors section. Advanced DAQ systems like those from Dewesoft can count these pulses and perform all kinds of mathematical operations on them, including converting them to RPM if applicable, allow the values to be reset, and more.

Many encoders can also detect the direction of rotation, which is essential in some applications. Typical Rotary Encoder. Incremental encoders report relative changes in position and direction - they do not track absolute position angle. Incremental encoders output A and B signals, which indicate changes in movement and direction.

When this position is reached an additional Z output signal is generated. Incremental encoders are the most common and popular types of encoders. They use a quadrature encoder to generate their A and B outputs. Quadrature encoder. With incremental encoders, this can be from a few hundred steps to 10, steps around one rotation. Incremental encoders output changes in movement and direction with very low latency, making them ideal for very high-speed applications that absolute encoders cannot support.

Pulses per revolution , aka PPR, is a defining characteristic of incremental encoders. The higher the PPR, the higher the resolution of the encoder. It is important that the counter input that you connect an incremental encoder has a high enough bandwidth to handle the maximum possible output. If this encoder rotates at RPM, it will be outputting:.

As the Sharper Image Digital Tape Measure Usa name implies, absolute encoders output the absolute current shaft position, making them ideal for angle-based measurements. They are available in mechanical, optical, and magnetic versions. An example of an absolute encode. While incremental encoders output a stream of pulses, absolute encoders output unique values for each position around the shaft. Another distinction is that while incremental encoders simply output their A, B, and Z pulses when the shaft turns, absolute encoders must be interrogated by the measurement system.

They then output a unique multi-bit word of data that indicates the exact position of the shaft. This word is a unique value and does not have to be decoded per se. Note that since these sensors do not have pulse outputs, they cannot be used with Dewesoft SuperCounter inputs. They require a digital interface that can read in the multibit readings.

Common interfaces available for absolute encoders include serial, Fieldbus, and ethernet. A linear encoder measures position along a linear path. Unlike a rotary encoder which has a circular plate inside that allows it to measure shaft position, most linear encoders move along an external scale and determine their position from markings on the scale. Linear Encoder. Image courtesy of Heidenhain. A perfect example is an inkjet printer, which uses a linear encoder to precisely move the printhead back and forth across the width of the paper during printing.

High resolution and accuracy are obviously required in this and countless other applications. The most prevalent sensing technology used with linear encoders is optical, however, there are encoders that also employ magnetic, capacitive and inductive technology.

There are both analog and digital output linear encoders. Dewesoft data acquisition systems are better suited to digital outputs since they provide A and B outputs very similar to incremental rotary encoders as described in the previous section. This angle-based sensor is made up of gear with teeth around its circumference that are mounted onto a motor shaft, plus a proximity sensor of some kind positioned so that when the gear teeth pass by, they will be detected.

This proximity sensor is typically a Hall Effect type, but others are possible. Gear tooth sensors are ideal for measuring the speed of a motor, or engine speed. Such a sensor is analogous to a tachometer gauge. Gear tooth with proximity sensor. The Hall effect proximity sensor detects the variation in flux found in the air gap between a magnet and passing ferrous gear teeth.

In modern DAQ systems, the signal is converted into a binary square wave that is immune to orientation requirements and can follow the gear speed down to a full stop … and detect the first gear tooth that passes immediately upon power on. Note that most Hall Effect sensors can detect not only gear teeth passing by, but can also be used to detect holes in disks and plates, ferrous features e.

When a gear tooth is detected, the sensor outputs a digital 1 When a gap between teeth is detected, sensor outputs a digital 0. Accordingly, the sensor can only output a positive-going square wave when each tooth passes by.

But we cannot know the top dead center, or any other absolute reference, because there is no reference provided by this gear tooth configuration. In other words, we cannot know which of the 60 teeth our sensor is detecting, so there is no way to know the position of the shaft.

So while In applications where it is necessary to know the angle of the shaft itself, we need to use a gear tooth with missing teeth. A common practice is to use a gear tooth sensor where 2 of the 60 teeth are missing. The gap is used to report the top-dead-center or starting position of the shaft. Knowledge of the starting point or top-dead center is essential in some applications. Typical Gear Tooth with Missing Teeth.

The two missing teeth can be positioned on the shaft at whatever angle desired, for example at the top-dead-center location. These types also provide the direction of rotation in systems where the shaft may spin both clockwise and counterclockwise. An infrared optical sensor is mounted in close proximity to the markings.

It outputs a pulse each time a hole or black mark passes by. These disks are available in varying resolutions. Typical Disk-type Optical Sensor. There are also optical tape sensors, which consist of an optical sensor and adhesive tape which has black and white stripes printed on it. The striped tape is wrapped around a stripe shaft, with the optical sensor pointed at it.

The sensor bounces light off the tape and can detect each black mark and convert it to an output pulse. There are also optical tachometers, which project visible light at a rotating wheel or shaft and use the reflections to count features on the shaft or wheel to calculate the RPM.

It has a bandwidth of kHz and a convenient adjustable detection threshold. When you wrap the tape around a shaft, there will be a transition point. It is possible to add black tape to this point to create a triple black stripe.

The optical sensor can use this as a reference point, so we have a known angle or position. Triple black stripe serves as a zero reference point in a tape sensor.

An electronic counter is a digital input circuit that counts the number of pulses that are input from proximity sensors, encoders, and similar devices. The simplest type of digital counters track and count time and pulses. Much like a stopwatch, they can be reset and can count up to a certain value. This digital pulse train from a proximity sensor indicates a variable rotational speed.

The simple counters provided by most manufacturers usually provide ample capability when used by themselves, but when they are part of a data acquisition system that is simultaneously Digital Circumference Tape Measure Free measuring analog data and perhaps even additional inputs, like CAN bus data, PMC data, video frames, etc.

This is where SuperCounter technology from Dewesoft comes in. They are usually provided on a rugged locking LEMO connector, but there are other connector possibilities with some models. There are typically three inputs, because encoders require it, as we will describe in the encoder section below. The inputs are TTL level, meaning that their low state must be below 0. Before we get into all of the digital input operating modes and how you can use them, we should review a very important aspect of what makes SuperCounters so special - and it has to do with how they precisely align counter data with the analog and other data.

The standard counters available on most DAQ systems today provide only integer resolution outputs e. As a result, their outputs are always one sample behind the analog sensor data. This can be a real problem in applications like rotational or torsional vibration when a phase shift of even one sample can change the results. SuperCounters solve this problem completely by extracting floating-point values like 1. In fact, a SuperCounter is really two counters in one.

The input is fed in parallel into both counters, and the sub counter measures the exact time of the rising edge of the signal.

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