User manual

OperatingInstructions:
TheOn/Offswitchislocatedontheback‐panelclosetotheACinlet.Afterturningthe
U70Fon,theinstrumentwillgothroughatestandcalibrationcycle.Firstasingledotwill
ascendandtheninvertanddescend.Theilluminationofthe10greenLEDswillindicate
thesuccessfulcompletionofthiscycleandtheinstrumentisthen ready for normal
operation.
Afailureoftheself‐testand/orthecalibrationwillbelightthe10redLEDs.Inthis
casetheinstrumentwillneedtoberepairedbyFredenstein or an authorized service
epresentative.DonotopenyourselftheU70F,highvoltageispresentinsideandcanleadtoa
otentiallyfatalelectricshock.
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AudioI/OConnection
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Fig.1BackviewofU70F
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TherearetwoaudioI/OchannelsofU70F.EachchannelfeaturesanXLRbalancedinput
andoutputtosimplifytheinsertionoftheU70Fbetweenthesourceandthedestination
equipment.
Standardcalibrationis+4dBu(1.23Vsine‐waveat1kHz)fora0dBmeterreading.The
70FisaPPMcalibratedinRMSvalues.Othercalibrationlevelsareavailableatthetime
fordering.
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OperatingModes
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Fig.2FrontviewofU70F
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Thefourillum front‐paneldetermine
theoperating
inatedpushbuttonswitchesontherightsideofthe
PEAK
modes(labeledPEAK,HOLD,RANGE,andBAR)
: EngagesthePeakHoldmodewitha2.5sholdtime
HOLD: Engages the Peak Hold mode with manual reset. To reset the peak value
simplyreleasetheswitchandengageitagain.
RANGE:
4
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Engages:thehighresolutionmeterrangeof‐19.5to+10dB(0.5dB/step),if
notengagedtherangeis‐39dBto+20dB(1dB/step).
BAR: Engagesthebardisplaymode,ifnotengagedthedotmodeisselected(likea
traditionalU70)