Kenwood FL-140 User manual

©PRINTED INAN
WOW-FLUTTER METER
KENWOOD
INSTRUCTION MANUAL
KENWOOD CORPORATION
FL-140

CONTENTS
1. FEATURES 3
2. SPECIFICATIONS. 4
3. PANELEXPLANATION6
4.PRECAUTIONFORUSE11
5. OPERATING PROCEDURE 12
6.MAINTENANCE15
2
A product of
KENWOODCORPORATION
1 7-5, 2-chome, Shibuya,Shibuya-ku,Tokyo 1 50,Japan

1. FEATURES
a. The FL-140 provideson-meterdirectreadingsof
wowand flutter and rotational drift oftape
recorders, recordplayersandothervariousrecord-
ingequipment.
b.Itisdesignedformeasurementscompliant with
JIS, CCIR andDINStandards.
Co ThemetersprovideRMSvalueindications(incom-
pliance with JIS)orpeakvalueindications(incom-
pliance with CCIR/DIN Standards).Valuescanbe
readdirectlyonthemeter.
d. Five ranges,0.03%,0.1%0.3%,1%,and3%,offers
widerangeofmeasurement.
e. The FL-140 incorporates3kHz/3.15kHzsignalgen-
erator with highlystablecrystaloscillatorswhich
can beusedforselfcalibrationofthe drift meter.
The FL-140 issuitableasa signalsourcefor
recording.
f.OnlycheckingThe monitor lampenableswowand
flutter measurements without adjustingthe input
level and input frequency.
g. The FL-140 hastheTO SCOPE terminalfor
analyzingwowand flutter componentsandthe
RECORDER terminalforrecordingwowand
flutter.
3

2. SPECIFICATIONS
[WowFlutter Meter] ...
Measuringcenterfrequency:
Within 3kHz±300Hz (JIS/CCIR)
Within 3.15kHz±300Hz(DIN)
Input level: 3mV~ 30V
Input impedance: Approx.300kO,unbalanced
Wow flutter measuringrange:
0.03— 3%5 ranges
DisplaysystemRMSvalue(JIS)
Peak value (CCIR/DIN)
Displayaccuracy: ±5%of full scale
Freq. response
Weightedcharacteristics:
Inaccordance with J IS, CCIR,
andDIN(at0.2~200Hz)
Wowcharacteristics:
0.5~6Hz(-3dB± 1dB)[JIS]
0.3~6Hz (-3dB± 1dB)[CCIR/DIN]
Fluttercharacteristics:
6~200Hz(-3dB± IdB)
Unweightedcharacheristics:
0.5~200Hz(-3dB± 1dB)[JIS]
0.3-200Hz(-3dB±.ldB):[CCIR/DIN]
Rolloff: 0.5Hzor less :
-6dB/OCT ormore[JIS]
200Hzormore:
-15dB/OCT ormore.[JIS]
,0.3Hz or less :
.-6dB/OCTormore[CCIR/DIN]
200Hzormore:
.-15dB/OCTormore[CCIR/DIN]
Maximum input voltage:
100V (DC4-AC peak)
Input monitor : INPUTMONITORlampchanges
from red into, greenat input
voltageof3mVormore.
[Output terminals]
Output signalforrecording
Signal frequency: 3kHzand3.15kHz
Accuracy : ± 5.x1,05
4

Output voltage: Approx.0.2Vrms(Open output)
Output impedance: Approx.60012(Unbalanced)
Distortion: 1%or less (600Otermination)
TOSCOPE output terminal
Output voltage: Approx.1.5Vrmsfor full scale
Output impedance: Approx.600O(Unbalanced)
RECORDER output terminal
Output voltage: 1 VDCfor full scale
Output impedance: Approx.600O(Unbalanced)
[Drift Meter]
Indicationaccuracy: ±5%of full scale
Drift measuringrange:
±5%
[PowerRequirements]
Supplyvoltage: 100/120/220/240VAC
±10%(Max.250V)50/60Hz
Power consumption: Approx.8W
[Environmental]
Within specificationtemp.& humidity :
10~35°C, 85% RH
Operatingtemp.& humidity :
0 ~ 40°C, 85% RH
[Dimensions]212Wx133Hx272Dmm
Max.dimensions: 212Wx156Hx312Dmm
[Weight]Approx.3.8kg
[Accessories] Cord with pair plug and
banana plug (CA-36) : 1
AC powercable: 1
Instructionmanual: 1
Replacement fuse: 2
5

3. PANEL EXPLANATION
Fig. 1 Frontpanel
Fig. 2 Rear panel
6

3-1Frontpanel
CD Wow-flutter meter
This meterreadswowand flutter directly.
"© Wow-flutter meteradjustscrew
For adjustmentofthemechanicalzero point of
the wow-flutter meter.Priorto turning on
power,adjustthemetertotheaccuratezero
point with a phillipstypescrewdriver.
(3) POWER switch
Pressing thisswitch (button engaged)supplies
powertothismeter,andtheINPUTMONITOR
lamp© goeson.
(DFUNCTIONswitches
Select frequencycomponentstobemeasured.
0WTD
Used formeasurementbasedonweightedchar-
acteristics commontoJIS, CCIR andDIN
Standards.
0WOW
Measuress wow with frequencycomponents from
0.5to6Hz(or0.3to6Hz)( 3dB).[Valuesen-
closed inparenthesesarefor DIN/CCIR.]
0 FLUTTER
•Measures flutter with frequencycomponents from
6 to200Hz(-3dB).
0UNWTD
Measures wowand flutter with frequencycompo-
nents from 0.5to200Hz(or0.3to200Hz )(-3dB).
[Values enclosedinparenthesesarefor DIN/CCIR.]
(I) INDICATIONswitches
Select thestandardforwowand flutter meas-
urement.
0 JIS
The meterCDreadseffectivevaluesbasedonJIS.
OCCIR
The meter® readspeakvaluesbasedon CCIR
Standard.
ODIN
The meter(I)readspeakvaluesbasedonDIN
Standard.
© RANGE switches
Select the full scale ofthe wow-flutter meter CD
outoffiveranges,0.03%0.1%,0.3%1%and3%.
©OSCselectorswitch
Selects thefrequencyofthesignal output from
7

theOSCterminalontherearpanel,3.15kHz
based onDINor3.0kHzbasedonJISand CCIRf
used forrecordingand drift meterselfcalibra-
tion.
® INPUT terminal
Applythesignaltobemeasuredtothisterminal.
Its inputimpedanceis300kOandthemaximum
inputvoltageis100V (DC + AC peak).
@ZERO ADJUST control
For 0%calibrationofthe drift meter.Adjust
the drift meterto0%undertheconditionwhere
noinputisappliedand"the INPUT MONITOR
lamplightsred".
IftheDINoftheINDICATIONbuttonsis pressed,
set theOSCselectorswitch© to3.15kHzfor0%
calibration.Ifthe JIS/CCIR button is pressed,
set OSCto3kHz.
© INPUT MONITORlamp
This lamplightsredifnosignalorimproper
signal isappliedtothe INPUT terminal.
Itlightsgreenifpropersignalisappliedtothe
INPUT terminal (i.e., theinputfrequencyis3kHz
±300Hzfor JIS/CCIR or3.15kHz±300HzforDIN
and inputlevelis3mVormore).
©Driftmeterzeroadjustscrew
For adjustmentofthemechanicalzero point of
the drift meter.Priontoturningonpower,
adjust themetertotheaccuratezero point with
a Phillipstypescrewdriver.
©Driftmeter(Zerocentertype)•
This meterreadsthe drift oftherevolutionof
a testpiecetobemeasuredsuchasa tape
recorder.Itmeasuresupto±5%of drift.
©Handle
Use thishandletotransportthemeter.
©Stand
Pull thestandinthedirectionofthearrow
and lockit.
Fig. 3

3-2 REAR PANEL
©TO SCOPE terminal
OutputsACvoltagein proportion towowand
flutter. Ifthemeterreadsthe full scale value,
approx.IVrmsis output, whichslightlydiffers
withstandards.Outputimpedanceis60012.
Use thisterminalforwaveformobservationor
frequency analysis.
©OSC3k/3.15kterminal
Outputsthesinewaveforrecordingata fre-
quency selectedwiththeOSCselectorswitch©.
Outputvoltageisapprox.0.2Vrms.Output
impedance is60012.Distortionis1%or less.
Use thissignaltomeasurewowand flutter of
taperecorders,etc.inaccordancewiththe
standard.
© RECORDER terminal
OutputsDCvoltagein proportion tothemeter
readingwhenmeasuringwowand flutter.
Ifthemeterreadsthe full scale value, output
voltageisapprox.1V.Outputimpedanceis
60011.
©Supplyvoltageselector/ Fuse holder
Set thisswitchtothesupplyvoltage used.
A 0.3Afuseis built inforthe100/120V areas.
Ifthismeterisusedinthe200/240V area,
replace thefusewitha 0.2A fuse.
Note: Donotuseanimproper fuse.
9

Usage of Output Terminalson Rear .Panel
Connecttoanoscilloscope,
memoryscope, digital memory
scope, FETanalyzer,etc.to
observewaveformoranalyze
thefrequencyofwowand flutter.
Connecttoa penrecorderor
digital memoryscopetorecord
wowand flutter
Outputs3kHzor3.15kHzsignal
forrecording.
Usage of Output Terminalson Rear Panel
Fig. 4
10

4. PRECAUTIONS FORUSE
1. Donotusethismeterina placeexposedtothe
directsun light. Otherwise,theinternaltemper-
ature rises excessively, resulting'inunstableoper-
ationand,insome cases, breakageoftransistors
and/orICs.
2. Donotusethismeterathightemperatureand
humidity.
3. Donotusethismeterina placewith excessive
vibrations.Otherwise,themetermaymalfunctions.
4. TheACsupplyvoltageshallbetheratedvoltage
±10%. Thesupplyfrequencyshallbe50or60Hz.
5. Priortoturningonpower,checkforthemechan-
ical zero point ofthe--meters.
6. Usethismeterwithinthespecificationtemperature
and humidityrangefrom10to35°C, 85%RH.
7. Priortostartingwowand flutter measurement,
confirmthestandardusedandconditions.
8. Themaximuminputvoltageofthismeteris100V
(DC + AC peak). Donotinputa voltageoverit.
Donotapplyvoltagetoanyofthe output termi-
nals.
11
9. Notethataccuratewowand flutter measurement
is notsecuredifthismeterissetupandput
down.

5.OPERATIONG PROCEDURE
Preliminary Work
1. Makesurethattheissuitableforthesupply
voltage used, thensetthesupplyvoltageselector
tothesupplyvoltage used. (Seeitem© in para-
graph REAR PANEL.)
2. Priortoactivatethe POWER switch,adjustthe
mechanical zeropointsofthe WOW-FLUTTER
meterCDand DRIFT meter© tothe0% point.
(See items© and© inparagraph FRONT PANEL.)
3. Press the POWER switch without applying input
signal ; the INPUT MONITORlamplightsred.
Afteridlerunningfor20to30minutes,calibrate
the DRIFT meterto0% with ZERO ADJcontrol
@. Ifthe JIS/CCIR oftheINDICATIONbuttons
©isselected,settheOSCswitch© to3kHz,
thenadjustthe DRIFT meterto0%.IftheDIN
button isselected,settheOSCswitchto3.15kHz,
thenadjustthe DRIFT meterto0%.
Accurate measurementisnotsecuredunlessthis
0% calibrationisperformed.
HowtoUseasWow-Flutter Meter
1. Connectthismeteranda testpiece(i.e.,a tape
recorder,recordplayer,etc.)asshowninFig.5.
To measurewowand flutter ofa taperecorder,
use thetapeforwowand flutter measurement,
orrecordthesignal output from theOSCterminal
©ontapeandplaybackthetape.
For measurementofa recordplayer,usetherecord
.forwowandf Suttermeasurement.
Note: Formeasurementbasedon JIS/CCIR Standard,
use tapeora recordcontainingsignalswhose
center frequencyis3.0kHz.(Formeasurement
based onDINStandard,thecenterfrequency
shall be3.15kHz.)
12

13
Rear panelof FL-140
Frontpanelof FL-140
R or L
REC
Terminal
R orL Play terminal
R orL Channel
Recordplayer
Tapedeck
Fig. 5

2. Selecta FUNCTION button ® corresponding to
desiredfrequencycomponents.Frequency compo-
nentsareas follows :
FUNCTION Frequencycomponent(Band
width)
WTD
weighted characteristicscommontostandards
0.2~ 200Hz
WOW 0.5(0.3)~ 6Hz
FLUTTER
6 ~ 200Hz
UNWTD
0.5(0.3)~ 200Hz
%Valuesenclosedinparenthesesarefor
DIN/CCIRStandards.
3. SelectanINDICATION button ® inaccordance
with thestandardused.
4. Setthe RANGE switch© toa rangewherethe
WOW-FLUTTER meter ® canbereadeasilyin
accordance with the magnitude ofwowand flutter,
5. The DRIFT meter reads shift and fluctuation of
the revolution ofa testpiece.
14

6.MAINTENANCE
Caution: Read thispagecarefullytokeepyoursafety.
For ElectricShockProtection: Besuretodisconnect
thepowercable from thesocketbeforeconductingthe
following operation.
REPLACING THE FUSE
In case thefusehasblown,locatethe cause. Ifthe
fuse itselfisthe cause, replaceitasfollows:
1. Pullthe plug ofthepowercord from thepower
outlet.
2. Removethefuseholderintherearpanelusing
a standardscrewdriver(seeFig.6 )•
3. Take outthe blown fuse,andinitsplace,insert
a newfuse.
4. Setthelabelofyourlinevoltagetothemark•,
then plug thefuseholdercontainigthenewfuse
into therearpanel.
CHANGINGTHE SUPPLY VOLTAGE
Remove thefuseholderintherearpanelusinga
standardscrewdriver.Thensetthelabelofyourline
voltagetothemarkT and plug thefuseholder
back into place.Whenchangingthesupplysetting
from 100/120Vto220/240V,changethe0.3Afusefor
a 0.2Aone.(seeFig.6 ).
Fuse holder
Fig. 6
15