Warwick Pro Fet II - Power Amp

2.3Poweramp
2.3Poweramp/Parameters
Testing/Regulating
front
Master:10
Fig.5.: requiredsettings
72V(peak-to-peak)(Master:).Theoutputshouldthenbeconnectedwiththe1ohm
resistance.Directlyafterwards,theshouldswitchtoStandbymodeandremain
thereuntilitisswitchedoff.
ThequiescentcurrentisbalancedusingtheparallelconnectedresistorsR1||R2.
TosetthequiescentcurrentadigitalmultimeterisalsoconnectedtotheresistorsR1||R2to
measurethevoltagedrop.
Themeasuredvalueshouldfallatleastwithintherange1.0mV-2.0mV.Ifthisisnotthecase,
itcanbetrimmedusingthepotentiometerP1.
Whentakingthesemeasurements,takecarethatthereisnosig nalattheinputandnoloadat
theoutput.Themeasurementsshouldbetakenatroomtemperatureandassoonaspossible
afterswitchingonthedevice,aswarmingofthepoweramplifiercouldcausedeviations.
10
ProFetII
Trimmingthequiescentcurrent
Limitingtheoutputsignal
Forthistest4ohms(450Wshortterm)loadresistanceisconnectedtothe.The
inputsignal,asinewavesignalwithafrequencyof1kHzandanamplitudeof0...5V(peak-to-
peak),isappliedtothe.Forthesemeasurements,thenecessaryfrontpanel
settingsareasfollows
Thesignalattheisslowlyincreasedto1,6V(peak-to-peak).Seethetablefor
thereactionoftheinputsignal.
SpeakerOut
EffectsReturn
EffectsReturn
NOTE :I ftheloadresistancecanbevariedto2ohms,theoutputstabilitycanalsobe
tested.Forthispurpose,theoutputmustbeconnectedtothe2ohmsload
resistance,butthepoweramplifiermustnotbeallowedtoswitchoverto
Standbymodebefore15Veff.
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