Fredenstein U70F User manual

Brand: Fredenstein

Model: U70F

Category: Musical Equipment

Type: User manual

Fredenstein U70F is a professional peak programme meter designed for precise audio level monitoring in recording studios, broadcast facilities, and live sound applications. With its advanced DSP technologies, it offers features like independent 60 LED scales, switchable scales for accurate level readings, and selectable dot or bar display characteristics. The U70F also includes true RMS metering for judging the loudness of a program, and a peak hold function with manual reset for capturing maximum peak values.

U70F

Peak Programme Meter

Operating Manual



Rev.2.00 JAN.,2014 byORIONcommunication

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Important Safety Instructions

1. Do Not try to service this product yourself! It may expose you to dangerous high

voltage and other risks.

2. Do Not operate this product near water.

3. Do Not place or operate near or over radiator or heat register.

4. Do Not expose this product to dampness, dust or corrosive liquids.

5. Do Not connect this product and Disconnect from wall socket during a lightning or

thunderstorm

6. Do Not obstruct this product ventilation slots, as insufficient airflow may harm this

product.

7. Do Not insert any objects into the openings of the equipment.

8. Plug directly into wall socket (100Vac~240Vac). Do Not use an extension cord

between this product and the AC power source.

9. When plugging this product into wall socket, make sure that electrical socket are

not damaged, and no leakage for gas or water pipes to begin with.

10. Place the connecting cables carefully so people won’t stumble or walk on it.

11. The equipment should be operated from the type of power indicated on the

marking label. If you are not sure of the type of power available, consult the

qualified technician.

12. Unplug the equipment from the mains and refer the product to qualified service

personnel for the following conditions:

• If liquid has been spilled on the product

• If the product has been exposed to rain or water

13. Unplug from the wall socket before cleaning. Use a damp cloth for cleaning. Do not

use liquid cleaners or aerosol cleaners



CAUTION!

The Federal Communication Commission warns the user that changes or modifications to the unit not

expressly approved by the party responsible for compliance could void the user’s authority to operate the

equipment.

2

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3

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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:



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.

 e

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.



AudioI/OConnection



Fig.1BackviewofU70F



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.



OperatingModes



Fig.2FrontviewofU70F



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



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)

5



earethreeIftheBARswitchisengagedandthendisengagedwithinthreeseconds,ther

nbesequentiallyselected:

PMDotandRMSBarMode(Defaultmodeafterpower‐up)

differentmodesca

a)SimultaneousP

b)PPMDotMode

c)RMSBarMode

ormally, if engage for more than 3 seconds, the

BAR switch toggles between the BarN

ModeandtheselectedDotMode.



TheU70Fisonlydesignedtoworkproperlywithbalancedaudiosignals. Unbalanced

signalswillnotbeabletodrivethemeterabove+4dBonthescale.

fmountinginastandard19”audiorackisdesired,pleaserelease the four feet by

emovingtheircenterscrews.



6



TechnicalData:

Inputsandoutputs balancedXLRconnectorswithaudiopass‐through

Insertionloss

 0dB

20kHz‐0.25dBFrequencyresponse 20Hzto

PeakAttacktime <10ms

RMSIntegrationtime 330ms

Samplingfrequency

 200kHz

1.5s/20dBin1dB/step,2.25s/20dBin0.5dB/stepReleasetime

Maximuminputlevel +28dBu

Inputimpedance

>5kΩ

+4dBu(1.23Vsine‐waveat1kHz)for0dBStandardcalibration

level



reading

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C,50–60HzwithIECpower‐cordMains 90–240VA

Powerconsumption

 Max.15W

Fuse 0.5AT(5x20Type)

X50mmX140mm

Dimensions(LxHxD)

482mm

1.6Kg

Weight



Packagingcontent:



U70FPPMMeter   x1

ountryspecificpowercord x1

peratingManual(English) x1



7

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AppendixA:

Calibrationmode:



Warning: Only trained qualified personnel may open covers and performs this

procedure.



To calibrate the U70F a precision, balanced output, amplitude jitter‐free sine‐wave

enerator,asmallPhilipsscrewdriver,andaverysmallflat‐head screwdriver areg

necessary.



Step1:Turn‐offthepowerswitchlocatedontheback‐panel.Disconnectthemainscord.

smallPhilipsdriver.



Step2:Openthetop‐coverafterremovingallscrewswitha

Step3:Engageallfourswitchesonthefront‐panel(labeledPEAK,HOLD,RANGE,andBAR)

Step4:Re‐connectthemainscableandturnpowerbackon

Step5:Disengagethetwoswitchesinthemiddle(labeledHOLDandRANGE)duringthe

self‐test and calibration cycle. The U70F will enter calibrationmodeafterthe

completionoftheself‐test.

Step6:Applythedesiredbalancedinputsignal(1kHzsine‐wave),1.23Vfor+4dBuorany

other level between+2dBu and +20dBu. The display will either show all yellow

LEDs(‐39dBto+20dB]illuminatedifthelevelistoolow,allgreenLEDs[‐9dBto

0dB]iftheleveliscorrect,orallredLEDs[+1dBto+10dB]ifthelevelistoohigh.

Step7:AdjusttheLevelcontrolslocatedonthemeterPCBscounter‐clockwiseifthelevel

istooloworclockwiseifthelevelistoohigh.Theleveladjustmentcontroltakes

10turnfrommaximumtominimum,sopleasebepatientandkeepturning.The

.1%(+‐1dBisabout+‐procedureallowsacalibrationaccuracyoflessthana+‐0

10%).

tep8:Pressanybuttontoreturntothenormaloperatingmode.

tep9:Turntheinstrumentoff,disconnectpowerandputthetop‐coverbackon.



Fredenstein U70F User manual

Brand: Fredenstein

Model: U70F

Category: Musical Equipment

Type: User manual

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Fredenstein U70F User manual

Fredenstein U70F User manual

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