Owner manual

FredensteinU70FPeakProgrammeMeter
FredensteinU70FManualV2.1July16,2014Page2
Introduction
CongratulationstoyournewU70F2‐channelPeakProgrammeMeter(PPM).Thenameis
the homage to the first PPM meter called U70, a tube based system developed and
anufacturedinGermanyintheearly50s.Ournewdesignusesadvanced DSP
echnologiesforimprovedperformanceandoffersthefollowingfeatures:
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t
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Î XLRbalancedinputsandoutputs
Î TheaudiopassthroughfeaturesimplifiestheconnectionoftheU70F
Î Independent 60 LED scales with five Illuminated scale markers per channel.
(Nonmultiplexedforflickerfreeoperation)
Î dBlinearscalesforimprovedreadability
Î Switchablescales:39dBto+20dBwithalinearresolutionof1dBperstepor
19.5dBto+10dBwithalinearresolutionof0.5dBperstep
Î SelectableDotorBardisplaycharacteristics
Î Selectable PeakHold functions with hold times of 2.5s or indefinitely with
manualreset
Î Displaymodes:
PPMBarMode,
PPMDotMode,
RMSBarMode,
PPMDotandRMSBarMode(default)operatedsimultaneously
EverymodesupportstheadditionalPeakHoldfeature.
Î Integrateduniversalpowersupply(90–240VAC,50–60Hz)withIECconnector
Î Rackmountortabletopoperation
Î Standard19 inch1U nclosure

PPM metering is more important than ever in modern digital recording since A/D
convertersdonotclipgracefullyatall.VUmeteringistooslowandunabletocorrectly
display transients and other complex waveforms. Monitoring the recording levels after
the A/D conversion in the digital domain cannot show any “overs” and will give false
readings. The U70F offers a high quality solution to these problems, latency free true
over‐sampledpeakmetering.Inaddition,thesimultaneoustrueRMS feature allowsthe
recording/mastering engineer to judge the “loudness” of the program. This especially
importanttoinsuretheprogram willbeon parwithotherswhen playingonradio/TV
stations,internetstreamsorportablemusicplayers.Thepeakholdfeaturewithmanual
resetallowsuserstoreadthemaximumpeakvalueofacompleteprogram.
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