Mul­time­ters

Car Mechanics (UK) - - Diagnostics Masterclass -

▶ With such a huge range of di­ag­nos­tic equip­ment avail­able, it is easy to over­look the hum­ble and in­ex­pen­sive mul­ti­me­ter. Be­ing a mea­sur­ing de­vice only, it can­not dam­age soft­ware. To use a mul­ti­me­ter suc­cess­fully, in many cases, you will need data. For ex­am­ple, if test­ing the ser­vice­abil­ity of a par­tic­u­lar sen­sor be­fore buy­ing a new one, you will need seek out the volt­age/hertz/ohms spec­i­fi­ca­tion, as well as which con­nec­tor on the sen­sor you need to use. Ad­vanced di­ag­nos­tic equip­ment might pro­vide some, if not all, of this in­for­ma­tion but, if you only have ba­sic hard­ware, you might need ex­tra as­sis­tance – model-spe­cific in­ter­net fo­rums might help, al­though be wary of the au­then­tic­ity of in­for­ma­tion sup­plied by ‘arm­chair ex­perts’, un­less it comes from a cred­i­ble source.

CM pub­lished a two-part guide to us­ing mul­time­ters in Fe­bru­ary and March 2016, while the June 2017 is­sue con­tains ad­di­tional in­for­ma­tion on how to test sen­sors.

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