![]() ![]() This unit comes standard with 21CFR11 software. Its specifically designed with the input of the world’s largest pharmaceutical companies. The AUTOPOL V PLUS Automatic Polarimeter is Rudolph’s top of the line six wavelength instrument. Most importantly, designed for demanding analytical laboratories.ĪUTOPOL V PLUS – Pharmaceutical Polarimeter.Additionally, Six Standard Wavelengths.TempTrol™ Electronic Heating as well as Cooling.Connect to Windows® based printer via USB.Save measurements direct to your network as well as server.0.0003 accuracy for low rotation samples of ☑° Arc.It also comes with TempTrol™ NIST traceable standard, TempTrol™ sample cell, TempTrol™ temperature validation cell and IQOQ (Installation Quality, Operation Quality) documentation. This unit comes standard with six wavelengths. For instance, The USB ports allow printing to a printer that has Windows® drivers. It also allows printing to a network printer. In addition, the built in Ethernet port allows saving data directly to your network server. Its specifically designed for the most demanding analytical laboratories. The AUTOPOL VI Automatic Polarimeter is Rudolph’s top of the line six wavelength polarimeter. Trouble viewing this video? Click Here AUTOPOL VI – Laboratory Polarimeter Saccharimeter Autopol 880 PLUS & 880T PLUS.Digital Saccharimeter Autopol 880 & 880T.As engineers, we have to determine if the level of imperfection will be acceptable for the application. We should stress the point that nothing is perfect. Hopefully, this example helped to show how accuracy and repeatability are commonly confused in motion control applications. At this point, it may be better to add another measuring device, like a linear encoder, that has a guaranteed accuracy. We could map the positional error throughout the entire travel range and make a calibration table, but that would be time-consuming and there is a lot of opportunity for mistakes. He wants to be able to enter any length in millimeters on an HMI screen and have the system cut that length. So happy in fact that now he wants to use this system to cut all of his wire. The solution worked! It turns out that even though the application called for positional accuracy, it could be accomplished with repeatability and a little calibration. This saved Bert a lot of money because a system that has an accuracy of 0.1mm at 900mm would be much more expensive. So instead of 90 turns of the screw, we will program the motor to rotate 89.97 times. Maybe if we shoot for 899.7mm, we will actually hit 900mm. What if we calibrate the system? The +0.3mm error can be accounted for by reprogramming the move. So, what do we do now? Do we trash this system and start from scratch? Not so fast. Positional accuracy is dependent on the stroke length and as the actuator travels 900mm, it is not uncommon for it to be off a few tenths of a millimeter. The reason? Nothing is perfect, not even a precision ground ball screw. Even though the system has a resolution of 0.005mm and a repeatability of 0.02mm, the actuator was still off by 0.3mm after traveling 900mm. Repeatability was mistaken for accuracy, that’s how. This is a very common problem, and these are real world numbers. But it seems like all the measurements are off by about +0.3mm. The measurements were all very close, within 0.01mm of each other, so the repeatability is very good and within catalog specification. Three parts were measured and the values were 900.305mm, 900.295mm, and 900.300mm. Resolution: The smallest difference that can be measured.Īfter running the machine for a while it is discovered that the parts are too long.Repeatability: How close a group of measurements are to each other.Accuracy: How close a measurement is to the actual value. ![]() ![]() Here are some very simple definitions for each term: Accuracy, repeatability, and resolution are all used to describe the “correctness” of your results. So, a question that comes up when specifying a product or solution is, “How imperfect will my results be?” Fear not, there’s a measurement for that. The point is that everything can be measured. The next thing to keep in mind is that nothing is perfect. Measurements can be done on anything, like mass, distance, or even more complicated things like flow rate or humidity. Let’s take a few minutes to talk about these specifications and how they apply in the field of automation and motion control.įirst, let’s talk about measurement. This can cause products to be incorrectly specified and, in many cases, over-designed for an application. They are often misunderstood, used interchangeably, or just plain confused. The terms accuracy, repeatability, and resolution can be found on the spec sheets of many engineered products.
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