0.039370078740157 0.039370078740157 Connector Connector 1 Electrical Electrical 1 6.751968503937009 4.133858267716535 0 5.856299212598425 4.159390921165691 0 Type: RLM6-RLM6-10AWG-0Mx-xRx (shunt) 6.102362204724408 7.039254283276257 10.610236220472441 7.697110929871904 General Data Description: This brief overview of current-shunt design for analogue meters illustrates the typical schematic and associated calculations to make a shunt to match the required measuring parameters to a specific meter. Required Parameters: Ifs = The required full scale reading eg 30 Amps Im = Meter sensitivity = FSD eg 1 mili-Amp Rm = Meter Internal Resistance eg 50 Ohms Notes: There are practical considerations relating to the choice of meter, especially with regard to the manufacture, or supply, and power rating of the shunt resistor, and the native scale. Leads from the shunt to the meter may contribute errors if not factored in. 1.315070441005123 3.149606299212598 http://www.casa.co.nz 10.433070866141730 7.236104676977041 http://www.casa.co.nz 0 0 http://www.casa.co.nz 5.853346456692914 0.247915700599100 0 0.292322834645670 4.159390921165691 0 Meter-Shunt-Calculations.viz 10.511811023622046 7.039254283276257 NOTICE – the information on this page is not guaranteed for accuracy – CASA accepts no responsibility (neither expressed nor implied) for any errors or the consequence therefrom. 7.327428721030371 0.503821212410122 Meter Shunt Fabrication - Parameters and Calculations 6.102362204724409 7.688860582488847 See next page > 9.909176586128940 1.338582677165354 4.907780590210015 4.330708661417322 0 8.600747794500903 4.330708661417322 0 10.564631634925171 4.322004189323202 3.794618523064120 2.559055118110236 Heatshrink 3.794618523064120 2.066929133858267 10.093831121489320 2.559055118110236 Heatshrink 10.093831121489320 2.066929133858267 Copper Ring Lug 10.564631634925171 3.543307086614179 Copper Ring Lug 3.085957105741285 3.543307086614179 3.069084243559870 4.330708661417322 3.912728759284591 4.842519685039370 0 4.385169704166481 4.842519685039370 0 20.0 4.148949231725538 5.039370078740159 0 9.109579152985383 4.813644612826101 0 9.582020097867272 4.822834645669292 0 20.0 9.345799623197019 5.060360091793935 0 1.574803149606300 6.924028871391076 Meter (movement) Sensitivity Im Internal Resistance of meter Rm Required Full-Scale Reading Ifs 6.747374428575931 1.574803149606298 6.747374428575932 4.330708661417322 1 Label .5 Slider position (0-1) Shunt Resistor Rs (shunt) 6.854001724049203 5.748031513125987 0 10.881232696292470 5.236220480972442 0 2.810366554560182 5.236220480972442 0 DRAFT 9.322940212785111 5.782234122437153 6.732283464566929 3.070866141732284 Edition: 23/07/2023 10.472440944881889 6.830708661417323 0.039370078740157 0.039370078740157 Connector Connector 1 The simple formula for calculating the required current-shunt resistance RS (Ohms) to enable a meter with a full-scale sensitivity of Im (Amps) and internal resistance Rm (Ohms) to measure Ifs (Amps) is: Rs = (Im / Rm) * Ifs Where: Rs = Current shunt resistance (Ohms) Im = Full-scale sensitivity of the meter (Amps) Ifs = Current to be measured (Amps) Rm = Internal resistance of the meter (Ohms) Example – 1 (Shunt For 30Afs to suit a 100uA 50 Ohm meter) Rs = Current shunt resistance (Ohms to be determined) Im = 0.0001 (100uA) = Full-scale sensitivity of the meter (Amps) Ifs = 30 (30 Amps) = Current to be measured (Amps) Rm = 50 (50 Ohms) = internal resistance of the meter (Ohms) Rs = (0.0001 / 30) * 50 = 0.00016666 Ohms (1.7 uOhms) Example – 2 (Shunt For 50Afs to suit a 1mA 50 Ohm meter) Rs = Current shunt resistance (Ohms to be determined) Im = 0.001 (1mA) = Full-scale sensitivity of the meter (Amps) Ifs = 50 (50 Amps) = Current to be measured (Amps) Rm = 50 (50 Ohms) = Internal resistance of the meter (Ohms) Rs = (0.001 / 50) * 50 = 0.001 Ohms (1 mOhms) 8.402559055118109 4.169783464566930 0.336286988746904 4.159390921165691 0 5.878281289649044 4.159390921165691 0 5.875328533743533 0.247915700599100 0 2.854330708661417 2.028319214004499 1.023622047244094 7.716535433070865 On-Line calculator: https://electronixforu.com/calculators_shunt 3.543307086614173 7.720660606762390 https://electronixforu.com/calculators_shunt 0 0 https://electronixforu.com/calculators_shunt 2.952755905511810 5.518249671916010