A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
True RMS Meter. There exists a fundamental difference between the readings on a normal ac meter and on a true rms meter. The first uses a D’ Arsonval movement with a full or half wave rectifier, and averages the values of the instantaneous rectified current.
As noted above, either of the current monitor projects will also benefit from using a true RMS metering system. Most common electronic devices draw a non linear current, and a standard average reading (but RMS calibrated) meter will underestimate the current – often by a considerable degree.
This method is quite simple and less expensive. But sometimes rms value of the non sinusoidal waveform is required to be measured. For such a measurement a true rms reading voltmeter is required.True rms reading voltmeter gives a meter indication by sensing heating power of waveform which is proportional to the square of the rms value of the ...
A perfect candidate for a true RMS meter is a distortion meter. The input waveform is always a sinewave, but the output waveform is anything but sinusoidal. Because of the distorted residual waveform, virtually all distortion meters read low – the displayed distortion is less than the real value, and could read low by as much as 20%.
This is an true r.m.s. Converter circuit. Normally we need a device with low tolerances,and very accurate tuning. But this circuit is used a simple device, plain and decent quality. This circuit use principle of automatic gain control (AGC). Which include of two ICs ,number of XR 13600 (A1 and A2) and XR 1458 (A3, A4).
True RMS Reading Voltmeter RMS value of the sinusoidal waveform is measured by the average reading voltmeter of which scale is calibrated in terms of rms value. This method is quite simple and less expensive. But sometimes rms value of the non sinusoidal waveform is required to be measured. For such a measurement a true rms reading voltmeter is required.
The three main measurement techniques are shown here, and which one is best for the task depends on your application. For accurate power measurements, true RMS is almost always the preferred measurement, but if you only work with sinewaves then an average reading meter (RMS calibrated) will be fine.
A meter labeled "true RMS" meter has circuitry that actually determines the RMS function of the waveform, independent of the waveshape within its crest factor (peak to RMS) limits. P.S. sdowney717, I see no mention of the Elenco ST 3030 being true RMS in its manual or in its literature. I suspect it's not.
The AD636 computes the true root mean square of a complex ac (or ac plus dc) input signal and gives an equivalent dc output level. The true rms value of a waveform is a more useful quantity than the average rectified value because it is a measure of the power in the signal. The rms value of an ac coupled signal is also its standard deviation.
On .edn you find some circuits. Search for true rms. This link Circuit measures true rms and average value may be useful. Many digital multimeters do not use a proper "true RMS" approach. Hence they will only be accurate then measuring a low frequency sine wave.