PASCO WA-7428 User manual

SonometerSonometer
WA-7428
About the prAbout the productoduct
&2/%9897/>/<3=+8+::+<+>?=?=/.09</B:69<381>2/A+@/
:<9:/<>3/=90@3,<+>381=><381=J>38-6?./=>A979?8>=>938=>+66=><381=
90.3I/</8>638/+<./8=3>3/=%><3816/81>23=@+<3/.,C-2+81381>2/
:9=3>39890+=63.381,<3.1/?8./<>2/=><381%><381>/8=3983=@+<3/.,C
2+813817+==/=0<97>2/6/@/<+>>+-2/.>9>2//8.90>2/=><381&9
@3,<+>/>2/=><381=:6?-5>2/7A3>2+:3-59<?=/</=98+8-/,C
@3,<+>381+>?838109<5'=/+=9?8.=/8=9<A3>2%#$@?/9<#%"
+:=>98/>97/+=?</>2/0</;?/8-C90@3,<+>398
What'What's includeds included
F %9897/>/<
F E<3.1/
F E?3>+<:3-5
F E38-2=><381
F E38-2=><381
RequirRequired itemsed items
F +<1/%69>>/. +==%/>+<1/%69>>/. +==%/>
+81>2/7+==/=0<97>2/6/@/<=>9+::6C>/8=398>9>2/=><381=
'=/>2/ +<1/%69>>/. +==%/>51%/>9<>2/ 
+<1/%69>>/. +==%/>
F &?83819<5=&?83819<5=
$/=98+>/>2/=><381=A3>2>?838109<5='=/>2/%&?8381
9<5%/>9<>2/%&?83819<5&/-283-+6%/>
F %9?8.%/8=9<%9?8.%/8=9<
/+=?</A+@/0</;?/8-CA3>2+=9?8.=/8=9<'=/>2/#%
)3</6/==%9?8.%/8=9<9<>2/'J%9?8.%/8=9<A3>2
3-<9:298/
PParart names and functionst names and functions
1
2
3
4
5
6
7
8
&?8381:/1&?8381:/1
&?<8>2/>?8381:/1>9+.4?=>>2/>/8=39838>2/=><381?8>36>2/
>/8=3983816/@/<3=6/@/6
1
%><3811?3./%><3811?3./
+5/=?</>2+>>2/=><3813==3>>38138>2/=><3811?3./A2/8
+::6C381>/8=398>9>2/=><381
2
<3.1/<3.1/
%63./>2/,<3.1/+6981>2/<?6/<>9@+<C>2/6/81>290>2/=><381
+5/=?</>9:?>>2/1<99@/98>2/,<3.1/98>9>2/<+3=/./.1/
98>2/%9897/>/<'=/>2/38.3-+>9<98>2/,<3.1/>97/+=?</
>2/6/81>290>2/=><381
3
$?6/<$?6/<
'=/>2/<?6/<A3>2>2/,<3.1/=>97/+=?</>2/6/81>290>2/=><381
&2/6/81>290>2/=><3813=./G8/.+=>2/.3=>+8-/,/>A//8>2/
=><3811?3./+>>2/-77+<5+8.>2/38.3-+>9<98>2/,<3.1/
4
%9?8.,9+<.%9?8.,9+<.
#?>>2/,+=/90+>?838109<598>2/=9?8.,9+<.>9</=98+>/>2/
=><381=
5
&/8=3983816/@/<&/8=3983816/@/<
+817+==/=0<97>2/6/@/<>9:<9@3./>/8=39898>2/=><381&2/
6/@/<+::63/=+>/8=398/;?+6>9G@/>37/=E>2/7+==A/312>
&2/6/@/<38-6?./=+=:3<3>6/@/6>9./>/<738/A2/8>2/6/@/<3=
6/@/6
'&J"! 989>2+8179</>2+851907+==0<97/+-2
6/@/<$/79@/7+==/=0<97>2/6/@/<=A2/8=>9<381>2/./@3-/
6
.4?=>+,6/099>.4?=>+,6/099>
&?<8/+-2099>+=8//./.>97+5/>2/%9897/>/<6/@/6
7
&2?7,=-</A=&2?7,=-</A=
'=/>2/>2?7,=-</A=>9=/-?</>2/6/@/</8.+8.:/1/8.>9>2/
=9?8.,9+<..?<381+==/7,6C
8
Product Guide
012-17145A
Sonometer | 1

Assemble the SonometerAssemble the Sonometer
/09</?=381>2/%9897/>/<C9?8//.>9+>>+-2/+-2/8.>9>2/
=9?8.,9+<.+8.+>>+-2>2/=><381=
Step 1: AStep 1: Attach the endsttach the ends
 J8=/<>>2/>/8=3983816/@/</8.38>9>2/1<99@/=+>>2/-7/8.
90>2/=9?8.,9+<.&312>/8>2/>2?7,=-</A=
 J8=/<>>2/>?8381:/1/8.38>9>2/1<9@/=+>>2/-7/8.90>2/
><+-5&312>/8>2/>2?7,=-</A=
Figure 1. Installing the tuning peg and tensioning lever ends to the
soundboard.
Step 2: AStep 2: Attach the stringsttach the strings
!9>/ 98></79@/>2/=><381=+0>/<38=>+66+>398&2/=><381=
7+C,</+530C9?><C>9</38=>+66>2/7
 6318>2/>?8381:/1296/A3>2>2/=><3811?3./,C>?<8381>2/
>?8381:/1589,
 J8=/<>>2/,+66/8.90>2/38-2=><38138>9>2/1<99@/90>2/
>/8=3983816/@/<
 J8=/<>>2/=><381>2<9?12>2/>?8381:/1296/#?66>2<9?12?8>36
>2/6/@/<+<7>36>=+>3>=7+B37?7:9=3>39831?</31?</ 
Figure 2. String pulled through the tuning peg with the tensioning
lever at the maximum position.
 3@/>2/=><381-790=6+-5>2/8,/8.>2/=><381+>>2/:/1
31?</31?</ 
Figure 3. String bent at peg with 5 cm of slack.
 &?<8>2/>?8381:/1-69-5A3=/>9A<+:98/>?<890>2/=><381
+,9@/ >2/,/8.38>2/=><381
&3: #</==.9A898>2/=><381,/>A//8>2/>?8381:/1+8.
=><3811?3./+=C9?<9>+>/>2/:/1
 )<+:>2/</=>90>2/=><381 ,/69A >2/,/8.,C<9>+>381>2/>?8381
:/1-69-5A3=///:<9>+>381>2/>?8381:/1?8>36>2/6/@/<
</+-2/=3>=7+B37?72/312>
 ?>9I>2//B-/===><381
&3: //:>2//B-/===><38109<=>?./8>=>97/+=?</>2/
7+==:/<?83>6/81>2
 $/:/+>>2//8>3</:<9-/.?</?=381>2/38-2=><381
2 | Sonometer

Using the SonometerUsing the Sonometer
Apply and measurApply and measure string tensione string tension
+813817+==/=0<97>2/>/8=3983816/@/<+::63/=>/8=398>9>2/
=><381=&2/=><381>/8=3983=/;?+6>9G@/>37/=>2/A/312>90>2/
7+==/=+=38.3-+>/.,C>2/E98>2/6/@/<
 +817+==/=0<97>2/89>-298>2/6/@/<
'&J"! 989>/B-//.51:/<=><381//:0//>+8.
,9.C-6/+<90>2/+</+?8./<>2/7+==#6+-/+09+7:+.?8./<
>2/7+==>9:<9>/->>2/H99<=+8+../.:</-+?>398C9?-+8
+6=92+81>2/7+==0<97+=><381>9738373D/>2/.3=>+8-/>9
>2/H99<
 &?<8>2/>?8381:/15/C?8>36>2/>/8=3983816/@/<3=6/@/6
 ?6>3:6C>2/>9>+6A/312>90>2/2+813817+==/=,C>9./>/<738/
>2/>/8=39898>2/=><381
Set and measurSet and measure the string lengthe the string length
'=/>2/,?36>38<?6/<A3>2>2/,<3.1/=>9./>/<738/>2/6/81>290>2/
=><381
 #6+-/+,<3.1/98>2/%9897/>/< +5/=?</>9:6+-/>2/1<99@/
98>2/,<3.1/98>9>2/<+3=/./.1/98>2/%9897/>/<
 9@/>2/,<3.1/>9>2/./=3</.:9=3>398
 $/+.>2/7/+=?</7/8>98>2/38.3-+>9<7+<598>2/,<3.1/>9
./>/<738/>2/=><3816/81>231?</31?</ 
Figure 4. Use the indicator on the bridge to determine string length.
Resonate a string with a tuning forkResonate a string with a tuning fork
#6+-/>2/,+=/90+@3,<+>381>?838109<598>2/=9?8.,9+<.>9
</=98+>/+=><381'=/:+:/<<3./<=>9=//>2/=><381@3,<+>398=79</
/+=36C
 +817+==/=0<97>2/>/8=3983816/@/<>9+::6C>/8=398>9>2/
=><381&?<8>2/>?8381:/1?8>36>2/>/8=3983816/@/<3=6/@/6
'&J"! 989>/B-//.51:/<=><381//:0//>+8.
,9.C-6/+<90>2/+</+?8./<>2/7+==#6+-/+09+7:+.?8./<
>2/7+==>9:<9>/->>2/H99<=+8+../.:</-+?>398C9?-+8
+6=92+81>2/7+==0<97+=><381>9738373D/>2/.3=>+8-/>9
>2/H99<
 ?>7?6>3:6/77E-7:3/-/=90:+:/<>97+5/=><381<3./<=
 96./+-2<3./<382+60+8.:6+-/>2/7+>@+<39?=69-+>398=98>2/
=><38131?</31?</ &2/<3./<=79@/A2/8>2/=><381@3,<+>/=
 #6+-/>2/,<3.1/8/+<>2/-77+<5
 (3,<+>/+>?838109<5+8.:6+-/>2/,+=/90>2/>?838109<598>2/
=9?8.,9+<.
&3: #6+-/+G81/<98=><38169-+>/.98>2/ 9>2/<=3./ 90>2/
,<3.1/>95//:3>0<97@3,<+>381
 %69A6C79@/>2/,<3.1/>9>2/-7/8.?8>36>2/:+:/<<3./<=
=>+<>@3,<+>381
Figure 5. The base of a tuning fork placed on the Sonometer with paper
riders on the string.
Sonometer | 3

MeasurMeasure fre frequency with a sound sensorequency with a sound sensor
/+=?</>2/0</;?/8-C90+@3,<+>381=><381A3>2+=9?8.=/8=9<+8.
+8&.3=:6+C38%#$@?/9<#%"+:=>98/
Figure 6. Place the sound sensor on the table under the Sonometer.
 +817+==/=0<97>2/>/8=3983816/@/<>9+::6C>/8=398>9>2/
=><381&?<8>2/>?8381:/1?8>36>2/>/8=3983816/@/<3=6/@/6
'&J"! 989>/B-//.51:/<=><381//:0//>+8.
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