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Power'source:!X4+8*)!(,1(!(,)!=*-=)*!=-@)*!+8==A<!3+!C)34>!8+)9?!
Near'noise'source:!H-D)!=)91A!1@1<!'*-B!=-@)*!+8==A3)+!149!-(,)*!)\83=B)4(?!
Other'equipment:!g)B-D)!-(,)*!)'').(+!'*-B!+3>41A!.,134p!+))!3'!4-3+)!=)*+3+(+?!
Bad'cables:!"@1=!-8(!1893-!.1CA)+?!
USB'ground'loop:!F,)4!.-44).()9!(-!1!.-B=8()*!8+34>!1!5"0!.1CA)G!4-3+)!.14!1==)1*!34!(,)!1893-!
+3>41A?!;,3+!8+81AA<!*)+8A(+!'*-B!>*-849!A--=!4-3+)!98)!(-!(,)!#'()*+,-./!149!.-B=8()*!*84434>!-4!
+)=1*1()!=-@)*!+8==A3)+?!I4!(,)!.1+)!-'!A1=(-=+G!(,)!4-3+)!.14!-'()4!C)!B3(3>1()9!C<!93+.-44).(34>!
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+-B)!5"0!,8C+!14 9!B- (,)*C- 1*9+!1*)!34,)*)4(A<!4-3+<G!+-!3(6+!4-(!1A@1<+!=-++3CA)!(-!)A3B341()!5"0!
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Low'power:!X4+8*)!(,1(!(,)!=*-=)*!=-@)*!+8==A<!3+!C)34>!8+)9?!
Not'calibrated'properly:!W1A3C*1()!(,)!Q-(!Q149?!"))!(,)!Q-(!Q149!I4=8(!+).(3-4!'-*!B-*)!9)(13A+?!
Not'connected'properly:!W,)./!Q-(!Q149!.-44).(3-4+?!
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Wrong'power'supply:!5+)!.-**).(!=-@)*!+8==A<?!"))!(,)!2W!bc!M^-@)*P!+).(3-4!'-*!B-*)!9)(13A+?!
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• VA3=!(,)!XVVXW;!"X_XW;Ng!"FI;WQ!-4!(,)!,1*9@1*)!(-!(,)!A)'(!=-+3(3-4?!
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B-9)?!;,)4!(1=!2-4)?!`-8!+,-8A9!+))!(,)!WNJ;gN_!_X2!CA34/!@,)4!(,)!B)++1>)!3+!*).)3D)9?!
• ;1=!(,)!05gJ!C8((-4!34!(,)!J) 8 *- !# = = ?!;, 3+!- = )4 + !1!B)48!'-*!C 8 *4 34> !A- .1 (3- 4+ ?!
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=1*1B)()*+!'-*!(,1(!+-849!@3AA!*)B134!84.,14>)9?!
• g)=)1(!(,)+)!+()=+!'-*!(,)!B399A)!+@3(.,!=-+3(3-4!149!(,)!*3>,(!+@3(.,!=-+3(3-4?!
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