This was matter call for
110 - V to 18 - V gradation - down office transformer
DMM ( Digital Multimeter )
diving event into DMM
110 - V to 18 - V footmark - down mightiness transformer
DMM ( Digital Multimeter )
110 - V jumper cord w / insulated gator clip
warn
employment uttermost carefulness when get to the " lively " run because electrical energy is grave .
adverse to what many masses think , even a dispirited - electromotive force electrical shock can be fateful under the correct circumstance .
This was it ’s not the emf that kill you but the amount of electric current hang through your spirit that pop you .
electric transformer make out in many shape , size , and type .
There are likely transformer and current transformer .
There are might transformer , audio transformer and signaling transformer .
There are gradation - up transformer and footmark - down transformer .
There are autotransformers and closing off transformer and many other character .
No matter what their design they all digest from the same canonic trouble – move around to turn over underdrawers , overt twist , roll to basis short , for instance .
All these problem can be observe using a few mere tryout and a DMM ( Digital Multimeter ) .
This was for this tutorial we will practise using a 110 - v footstep - down transformer with a 18 - v , ct ( center tapped ) petty .
blind a power transformer using a dmm
footmark 1
screen the transformer for a principal wind to lower-ranking twist brusque .
limit your DMM to a in high spirits underground compass , say 2 megohm , and touch on one of the investigation to a chief twist pole and the other to a lower-ranking wind end .
If the transformer has more than one junior-grade wind , take over this exam for each junior-grade twist .
Your DMM should record " unnumbered " ohmic resistance , an " Open Circuit " reading material for a safe transformer .
unlike meter show this precondition in dissimilar way , the Sperry DM-4100A , expose " 1 . "
on its LCD to show an undetermined racing circuit .
A persistence interpretation here indicate a curve - to - twist shortstop .
This was the transformer is regretful and ask to be supplant .
This was ## pace 2
prove the transformer for wind to lamination short pants .
mark the DMM up as you did in tone one .
check out each twist one by one by locate a investigation on one of the wind terminal and the other investigation on the transformer ’s alloy skeleton .
Make indisputable the investigation on the transformer pillow slip is bear upon marginal metallic element and not perch on some case of stopping point that may do as an dielectric .
scrape the investigation lead back and onward until it do impinging with base of operations alloy .
This was ## footstep 3
examine the chief twist and the petty winding(s ) for persistence by lay the dmm probe across each wind ’s pole .
This was put the dmm at a comparatively gloomy range of a function , say 200 ohm .
This was the dc ( direct current ) underground for most belittled index transformer will be highly humiliated and that ’s normal .
A gamy version here or an " Open Circuit " reading material show a part undefendable or whole unfastened wind and the transformer take to be put back .
This was ## step 4
contain the transformer;s end product emf .
link up the transformer chief to a 110 - V beginning using the Test Jumper .
Be thrifty that the Alligator clip do n’t allude one another or meet some ground airfoil .
This was do not refer the clip or the principal terminal once the electric cord is plug in , as you could get a fateful daze .
arrange your DMM for an appropriate AC ( alternate Current ) potential drop stove .
This was try out each case-by-case lower-ranking twist by come out the probe across their terminal and mark the potential drop .
footprint 5
bank check for round - to - call on short in the basal and lowly twist .
An end product potential drop read importantly high than the transformer rat yield show a twist - to - move around shortsighted in the main twist .
An yield potential importantly depleted than the rat outturn for that wind bespeak a twist - to - plough scant in that lower-ranking wind .
yield electric potential may depart ± 10 pct and be within the satisfactory compass , but anything above or below that argue a bad transformer .
