Germany
Manufacturer/ Producer
Germany
Unique: The TRY20 offers 3 axes and is still a compact thumb joystick The joysticks of the TRY20 series are unique in their class thanks to their rotatable knob, which, as a z-axis, offers an additional third, proportional degree of freedom for controlling the application. The industrial joysticks achieve the highest level of quality in terms of mechanics, materials and workmanship. The high-quality haptics convey a secure operating feeling and enable the user to precisely control movements in several dimensions. Double (redundant) outputs are optionally available, which enable use in safety-critical applications. Variants with protection class IP40 (hardcover) and sealed variants (rubber bellows) with protection class IP54 are available. If the z-axis (the rotatable knob) is not required, the 2-axis version with protection class IP65 can be implemented as a special version.
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The adaptability of the sensors in the premium joystick series 826 is unequalled in the field of joysticks The joystick series 826 fulfils the highest demands on quality. It shows its strengths at challenging applications with up to 2 axes, where no compromises are made when it comes to endurance and reliability, and the application asks for special sensor configurations. Die configuration options of the series 826 are unique: both axes exhibit a separated shaft for the sensors, so that the sensors, micro switches and return mechanism (spring return/friction clutch) can be adjusted individually. Especially for safety critical applications, this series is often the only series that offers the necessary options to fulfil the requirements.
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The series MM10 without spring return / MMR10 with spring return is used in applications with very confined space, which require a miniaturized displacement sensor with long lifespan, high accuracy and guided push rod on both sides. The linear potentiometers of the series MM10 / MMR10 are especially space-saving designed and therefore very suitable for applications with very confined space. The potentiometric distance measurement is carried out with a high-resolution conductive plastic resistive element. Thanks to this Comolded conductive plastic technology and the high-quality sleeve bearings, the compact displacement encoder has a very long lifetime and high accuracy due to its good linearity. In the displacement sensor series MM(R)10 the mechanical detection of linear movement is done by a rear and front guided push rod. The displacement sensor can be used both as a probe and with a guided push rod. The internal or external spring return opens up additional applications.
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The compact MRX50 panel encoders with 50 ppr. prove their precision and quality even after many hundreds of thousands of operations and are customizable on request The panel encoder MRX50 is, in the sum of its characteristics, out of competition. This product design with this fine-stepped 50 detents and push button even under increased environmental requirements (IP65) cannot be found a second time. The robust and precise panel encoder ensures, even after many hundreds of thousands of operations, the largely unchanged quality of its haptic properties, such as the detent and the shaft play. This was confirmed to us by customers who have undergone this sensor comprehensive testing and have opted for the MRX50. This makes the manual encoder the first choice when special emphasis is placed on longevity with consistent quality. MEGATRON customizes the panel encoders on customer request.
Request for a quoteMEGATRON Elektronik GmbH & Co. KG is a leading German supplier of precision sensors, industrial joysticks, precision resistors, small plastic parts and electronic housings. Founded in 1960, MEGATRON is an owner-run company based in Putzbrunn near Munich, Germany. It develops, produces and markets its own products as well as those of its longstanding international partners all over the world. MEGATRON works closely with OEM customers to develop individual and economical product solutions. A wide selection of immediately available stock items completes the portfolio.
Manufacturer/ Producer
Hermann-Oberth-Straße 7
85640 Putzbrunn - Germany
Germany
If, in a highly sensitive control system, the amplification should, for example, be so arranged that the control circuit will be stable with the mean slope (gradient) of the sensor, then it is important to be aware of any variations there may be in that slope (Fig. 12a, Fig. 12b). If, at any point, the gradient is appreciably steeper than the mean gradient, then there will be a higher closed-loop gain in this position and this could lead to feedback oscillation. If, on the other hand, the gradient is less steep at some point than the mean gradient, then repeatability would be reduced and there would be less control accuracy. If we relate this type of local gradient variation gl to the mean gradient go of the potentiometer, then this criterion is independent of the potentiometer length and can be used for the direct comparision of various potentiometers.
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Smoothness is a measure of the deviations from perfect regularity that appear in the output voltage of a potentiometer. This irregularity is measured over a specified travel increment, for example 1 %, and is expressed as a percentage of the applied voltage. For the measurement of smoothness, the VRCI definition calls for a bandpass filter to be used as a means of suppressing any linearity error and for the potentiometer to be operated with a load resistance (e.g. 100 . Rp). This method has certain disadvantages: a) The use of a filter causes both the absolute wiper velocity and any changes in such velocity to affect the smoothness values. Since the filter partly integrates and partly differntiates, the chart-recorded smoothness curve does not accurately indicate the variations in the output signal. b) The load applied to the potentiometer also contributes to error by causing variation in the contact resistance which is greatest with the wiper at the voltage application end and...
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When, some 60 years ago conductive plastic potentiometers were first introduced onto the market, it was apparent that although the winding jumps which were a feature of wire-wound potentiometers had been overcome, absolute smoothness of the output voltage could not be achieved. Following some basic reserach by. h. Wormser 4, 5, 6 , the term "smoothness" was included in the standard issued by the Variable Resistive Compontents Institute (VRCI). Although this definition was adequate at that time it cannot serve as a system definition for many applications. This is because it is now possible to produce potentiometers with appreciably better smoothness and linearity values. For this reason, Novotechnik has sought over the past years to develop definitions better suited to the current state fo the art. The various methods used are discussed and evalutated below.
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From here onwards, we are only concerned with the linear characteristics (linearity). Relationships must be suitably adapted for applications with non-linear characteristics (conformity) but there are no essential differences. As already mentioned in Section 2, the required linearity values can only be utilized so long as the signal output by the sensor "potentiometer" carries no current. We have now to consider the effect of wiper current on linearity. Fig. 10a illustrates the functional relationship between wiper current, contact resistance and linearity error. As is shown by the example in Fig. 10b (Characteristic 4), with a wiper current of 10 µA and a contact resistance of 10 kOhm, a potentiometer which has a resistance of 2 kOhm already has linearity error of 1.1 %. A similar situation arises with an ohmic load. This clearly shows how important are the roles played by both wiper current and contact resistance. Fig. 10a Fig. 10b
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