PS Magazine - APRIL 1977
PS, The Preventative Maintenance Monthly
ISSUE 293
APRIL 1977
I
1'
knows that to zero
multimeters lIke the TS-352B/U,
AN/URM±105 ²nd the Simpson 160,
you touch the red ²nd bl²ck probes
together ²nd turn the ohms ²djust
knob until the needle zeroes. RIght?
Well, right, but .
..
Th³t's the electrIc²l ³djustment,
²nd you do It ´henever you w²nt to
me²sure ohms.
Thereµs ³ mech²nIc²l ²djustment
th²t ² lot of peopLe don¶t know ²bout,
²nd It should be done before you even
use the meter. ·t Insures ²ccur²cy .
..
²nd c³n prevent unnecess²ry repl²ce¸
ment of p²rts or components.
The 3 meters ²bove h²ve ³
mech²nIc²l ²djustment screw on the
meter f³ce or just below it. The
pIctures show you where It is on e²ch
meter¹
To mech²nIc²lly ²djust the meter,
turn
the
screw
clockwIseº
counterclockwIse
splIts the zeroes on the lefth²nd sIde
bet
Is
to
m»ke
tHe
of the sc²le. The meter swItches c²n be mech³nic³¼ zero wIth the meter ½n tHe
in ²ny posItion
(just don't let the
pro¾es touch).
positIon you Intend to ¿se ½t. ·F yoÀÁre
goIng to ¿se It with the meter Ây½nG
down, then l³y it down ¾efOre yoÀ zeÃo
the meterÄ ·F the meter Ž¼¼ ¾e
st²ndIng up, zero ½t In th²t pos½t½oÆÇ
To ¾e s¿re youÈre rigHt on t³rget,
lIghtly t²p the meter f²ce Žth yoÉr
f½nger ²fter yo¿ zero it. ·f tHe meter
neEdle moves off zero, ²djust ½t b³cK
Ê w½th the screw.
·f you c²nÁt zero tHe needÂe ¾y
turnIng the screw e½thr Ųy, tHe
meter needs rep²Ir or c³Â½¾r³t½Ën.
T¿rn it inÄ
·nstructions on mech²n½c³Â¼y zerËÌ
Ing ² meter wi¼Â ¾e ½n tHe next
published cͲnges to TM ÎÎÏÐ6Ñ5Ï
203±12 on the URMÒÎ05 ²nd In TÓ
11±6625Ï366±15 on the ÔSÏ352B/UÕ
53
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