Transform.inverted) to generate a transform from output coordinate systemīack to the input coordinate system. The transformations also know how to invert themselves (via The naming and destination conventionsĪre an aid to keeping track of the available "standard" coordinate systems and That is why the displayĬoordinate system has None for the "Transformation Object" column - itĪlready is in display coordinates. The input to the display coordinate system. The Transform objects are naive to the source andĭestination coordinate systems, however the objects referred to in the tableĪbove are constructed to take inputs in their coordinate system, and transform In the "Transformation Object" column, ax is a System, and the transformation object for going from each coordinate system to Table below summarizes some useful coordinate systems, a description of each These objects, so you can reuse the existing transformations Matplotlib makesĪvailable to you, or create your own (see ansforms). The limits of custom figure generation, it helps to have an understanding of Won't need to think about this, as it happens under the hood, but as you push System, and the display coordinate system. Like any graphics packages, Matplotlib is built on top of a transformationįramework to easily move between coordinate systems, the userland dataĬoordinate system, the axes coordinate system, the figure coordinate A separate terminal block is provided which is coupled through a multi-lead connector to the meter circuit and which provides discrete individual terminal outputs readily wired by utility personnel trained in the use of older mechanical metering systems.To download the full example code Transformations Tutorial # These surfaces cooperate with spring biased contacts arranged to achieve proper contact with them when the meter cover is rotated into its latched orientation. Further, a key actuated switching input is provided through the cover face of the meter with the use of a pattern of contact surfaces positioned on the inner surface of the face. The meter structure is provided an EMF and RF barrier coupled to through the interconnection of the meter cover to neutral reference. Volt amperes are computed with respect to the zero cross-over events for both voltage and current samples, while quantities such as Q and var are developed by selective delayed multiplication of the unit degree samples.Ībstract: Metering apparatus which employs a structure conforming to long accepted industrial standards but which is adapted to meet the requirements for highly versatile solid-state meter circuits having a multitude of outputs both in terms of electrical signals and visual display. Generally, six of these outputs will be elected by the user. ![]() ![]() These expanded data valuations for current and voltage then are selectively multiplied for each degree sampled to develop data available for generation of 12 electrical parameter outputs. The scaling factor and the range data then are multipled to develop a digital representation of the sample amplitude which may have as many as 21 significant bits plus a sign bit. Sampling commences with a zero cross-over and a first digital conversion provides range data for developing scaling factors which are retained in memory and for providing a selective gain for amplifying. Abstract: Method and apparatus for metering polyphase power sources in which cycles for each phase are sampled at each degree and converted to a binary representation of amplitude.
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