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Mikrokator 509–4 C.E Johansson Eskilstuna Sweden. A Johansson Mikrokator (also called Abramson's movement) is a mechanical comparator used to obtain mechanical magnification of the difference in length as compared to a standard.
Comparators are closely related to operational amplifiers, but a comparator is designed to operate with positive feedback and with its output saturated at one power rail or the other. If necessary, an op-amp can be pressed into service as a poorly performing comparator, but its slew rate will be impaired.
Determination of iron by a colorimetric method Determination of iron by a colorimetric method, top view. Nessler cylinders (also named color comparison cylinders or color comparing cylinders) are laboratory tubes with a fixed volume, made of glass with optically plane bottom.
In most cases a comparator is implemented using a dedicated comparator IC, but op-amps may be used as an alternative. Comparator diagrams and op-amp diagrams use the same symbols. A simple comparator circuit made using an op-amp without feedback simply heavily amplifies the voltage difference between Vin and VREF and outputs the result as Vout.
The term "Cryogenic Current Comparator" stems from κρυος (Gr. frost, ice) and comparare (Lat. compare). The two quantum effects used in a CCC are the ideal diamagnetism of the superconductor, caused by the Meissner effect, and the macroscopic quantum interference of currents in a superconducting quantum sensor.
The comparator output drives the second common collector stage Q2 (an emitter follower) through the voltage divider R 1-R 2. The emitter-coupled transistors Q1 and Q2 actually compose an electronic double throw switch that switches over the upper legs of the voltage divider and changes the threshold in a different (to the input voltage) direction.
An optical comparator (often called just a comparator in context) or profile projector is a device that applies the principles of optics to the inspection of manufactured parts. In a comparator, the magnified silhouette of a part is projected upon the screen, and the dimensions and geometry of the part are measured against prescribed limits .
"Introduce 100 mL of [the] specimen into a Nessler tube, passing the specimen through a filter if it has any visible turbidity. Cap the tube, place in the comparator, and compare with the standards." [1] Once this is done there is a specific method of reporting results. You determine which standard is the closest to your specimen and report its ...