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1 DESCRIPTION TheKrohn-HiteModel7500wasthe
DESCRIPTION TheKrohn-HiteModel7500wasthefirstdirect-coupled,widebandamplifierthatofferedextendedoutputpowerandvoltagecapabilities,lowdistortion,anadvanced,allsolidstateTheModel7500providesmorethan75wattsofcontinuouspower(150wattsatdc),and125Vrmsfromdcto100kHz.Frequencyresponseofthe7500istypicallyflattowithin0.05dBovermostofitsrange.Inaddition,the7500typicallycontributesoftotalharmonicdistortion,atfullpoweroutput,upto10kHz.Thevoltagegainofthe7500isnon-inverting,andcanbeselectedforeither20dB(10)or40dB(100)offixedgain,orcontinuouslyadjustablefrom0dBto40dB.The7500also ADDITIONAL FEATURES Inaddition;theModel7500hasavariableoutputdcoffsetcontrol.Withanacinputsignal,theamplifier’scombinedacplusdcoffsetoutputisadjustablefrom0Vto±200Vpeak,opencircuit.Withnoinputsignalapplied,the7500providesanadjustabledcvoltageof0Vto±200Vopencircuit,foruseasanauxiliaryDCsupply,withintheamplifier’svoltageandcurrent OUTSTANDING PERFORMANCE TheoutstandingperformanceoftheModel7500istheresultofimprovedtechniquesincircuitdesign.Theinputstagesaredesignedtoprovideahighinputimpedance,extendedbandwidth,andexcellentdcandthermalstability.Theoutputstageisdesignedwithhighvoltagetransistors,inpl

2 aceofconventionaltransformercoupling,top
aceofconventionaltransformercoupling,toprovidethe7500withitshighoutputandvoltagecapability,anddirectoutputcoupling.Theoutputisprotectedfromshortcircuitsorotherabnormalconditionsontheamplifier’soutput,bytheuseofamodified,fold-backcurrent-limitingtechnique.Thistechniquepermitslimitingcurrenttovaryasafunctionofoutputvoltage,load,andfrequency.Theoutputstageisconvectioncooled,bytheuseofauniqueheatsinkarrangement,whichprovidesfreedomfrom APPLICATIONS TheModel7500isoneofthefewamplifiersonthemarkettodaythatofferacombinationofpower,performanceandversatility.Itspowerandvoltagecapability,lowdistortionandflatresponse,makethe7500wellsuitedforuseinprecisionmetercalibration,transducerdriving,bridgingapplicationsrequiringhighinputandlowoutputimpedance,andasalowdistortionacpowersource, “Quality” in Test and Measurement Since 1949DC Source/Calibrators, Tunable Electronic Filters,Wideband Power AmplifiersPrecision Phasemeters, Distortion AnalyzersFunction Generators, RC Oscillators Model 7500 Maximum Voltage: 140Vrms, O.C. (Specificationsapplyusinga200ohmresistiveload) Frequency Range:dc to 1MHz.Power:75 watts, dc to 100kHz; 40 watts at 500kHz; 10watts at 1MHz.125Vrms, dc t

3 o 100kHz; 90Vrms at 500kHz;45Vrms at 1MH
o 100kHz; 90Vrms at 500kHz;45Vrms at 1MHz.Current:625mArms, dc to 100kHz; 450mArms at 500kHz;225mArms at 1MHz.Frequency Response:Flat to within ±0.1dB, dc to 10kHz;±1.5dB to 500kHz; –3dB at approximately 1MHz.Harmonic Distortion (at 75 watts into 200 ohms):Voltage Gain:Fixed, 20dB ±0.2dB (X10) or 40dB ±0.2dB(X100), or continuously variable 0dB to 40dB.Gain Stability:line voltage.Dynamic Range:&#x±0.0;Ǜ&#x cha;&#xnge ;or ; 10;&#x% ch; nge;&#x in0;85dB.Phase Shift:0° ±1° from dc to 10kHz. Phase shiftincreases linearly to 100° (lagging) at 1MHz.Squarewave Response (at 100Vp-p into 200 ohms)Rise Time:Overshoot:Regulation:No load to 200 ohms, 10kHz.Hum and Noise (1MHz bandwidth):shorted; Coupling:Direct.DC Level:Nominal zero volts.DC Offset (no load):Variable, 0V to ±200V. Combined acplus dc offset limited to ±200V.DC Level Stability (After 30 minute warm-up):Vs. Line (short term):change.Vs. Time:Vs. Temperature:Internal Impedance:100kHz; INPUT Maximum Voltage:±20V peak in the variable and theX100 GAIN positions; ±200V peak in the X10 GAIN±200V (except VARIABLEGAIN position) in the ac position of the INPUT COUPLING1.5V rms at maximum gain setting.

4 Coupling:Either direct (dc), or capaciti
Coupling:Either direct (dc), or capacitive (ac) with lowfrequency cutoff at approximately 1Hz.Impedance:Fixed Gain Modes:1M ohm in parallel with 5pF.Variable Gain Mode:5k ohms. GENERAL Load Impedance:Capable of driving any load within thecurrent and voltage limitations of the amplifier.1.0 to zero, leading or lagging.Temperature Range:0°C to 45°C.Controls:Front Panel:POWER switch, 3-position push-buttonGAIN selector, variable GAIN control, 3-positionCHASSIS/FLOATING ground switch.Front Panel Indicators:Power ON, Output OVERLOAD.Terminals:BNC for INPUT, binding posts for OUTPUT.Rear Panel:BNC for INPUT, binding posts for OUTPUT,ac power receptacle, chassis ground post.Power Requirements:105-125 or 210-250 volts, singlephase, 50-400Hz, 85 watts quiescent, 400 watts.Fuse Protection:ac line, 5A slow-blow (115V), 2.5Aslow-blow (230V); output stage unregulated supplies, 1A5.25" (13.3cm) high, 16.63"(42.2cm) wide, 17" (43.2cm) deep; 35 lbs. (15.8kg) net, 403 terminal line cord; operating manual. OPTIONS 011:Remote Gain Control, VC Input ±10Vdc, gain isproportional to the VC input setting.Part No. RK-519 permits theinstallation of the Model 7500 into a standard 1

5 9" rackPart No. EW7500. OPTIONAL ACCESSO
9" rackPart No. EW7500. OPTIONAL ACCESSORIES CAB-005:Cable, Two Conductor Shielded Balance LineCAB-018:Cable, Multi-stacking Double Banana plugCAB-023:Cable Set, Low Thermal EMF RetractableBananaCable Set, Low Thermal EMF Spade LugCAB-025:Cable, BNC, 3ft, Low NoiseSpecifications subject to change without notice. WidebandPowerAmplifierModel7500 Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301Page 2 of 5Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com7500Data.doc WidebandPowerAmplifierModel7500 Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301Page 3 of 5Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com7500Data.doc Typical Performance Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301Page 4 of 5Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com7500Data.doc WidebandPowerAmplifierModel7500 WidebandPowerAmplifierModel7500 Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301Page 5 of 5Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com7500Data.doc