Hameg HM303-6 Service Manual Download Page 1

Page: 1 / 66

Release: December, 2007

3 5 M H z

A n a l o g O s c i l l o s c o p e

H M 3 0 3 - 6

Servicemanual

English

Summary of Contents for HM303-6

Page 1: ...Release December 2007 35 MHz Analog Oscilloscope HM303 6 Servicemanual English...

Page 2: ...e 89 336 EEC amended by 91 263 EWG 92 31 EEC Directive EMC 89 336 CEE amend e par 91 263 EWG 92 31 CEE Niederspannungsrichtlinie 73 23 EWG erg nzt durch 93 68 EWG Low Voltage Equipment Directive 73 23...

Page 3: ...6 FC Board 11 7 PS Board 11 PCB Interconnections 12 Board Replacement 14 1 PS Board 14 2 FC Board 15 3 CC Board 17 4 YP Board 17 5 XY Board 18 6 TB Board 19 7 CR Board 20 HM303 6 Troubleshooting 21 Se...

Page 4: ...ification to 10 ns cm Low Noise Measuring Amplifiers with high pulse fidelity and minimum overshoot Triggering from 0 to 50 MHz from 5 mm signal level up to 100 MHz from 8 mm Up to 500 000 signal disp...

Page 5: ...Base 0 2 s div 0 1 s div 1 2 5 Sequence Accuracy 3 Variabel uncalibrated 2 5 1 to 0 5 s div X Magnification x 10 up to 10 ns div Accuracy 5 Hold Off Time variable to approx 10 1 XY Bandwidth X Amplifi...

Page 6: ...ax 1mV div Y POS II Controls vertical position knob of channel II display SLOPE Selects the slope of the trigger signal Element Function SLOPE rising edge pushbutton switch falling edge TR LED lights...

Page 7: ...ime base control Decreasestimedeflectionspeed center knob at least 2 5 fold For time measurements turn to right hand stop Element Function XY Selects X Y operation pushbutton switch stops sweep X sign...

Page 8: ...ate Amplifier Y Pos Control LF Filter Impedance Converter FET Buffer Pre Amplifier 1 2 Attenuator 4 1 2 1 1 1 Attenuator 100 1 10 1 1 1 Input Coupling AC DC GND Var Gain Symetrie Trigger Pick Off Inve...

Page 9: ...of CH1 and CH2 are input in the Channel Switch diode switch of each channel Both channel switch outputs are connected with the Y Final Ampli er on XY Board 1 1 8 Channel Switch Control Depending on th...

Page 10: ...to 1 MHz probe high frequency adaptation to the oscilloscope frequency response 3 TB Board 3 1 Sync Amp The signal originating from the trigger channel switches enters this stage for additional ampli...

Page 11: ...capacitors etc to the COMP TESTER sockets 6 FC Board The switches and potentiometers on this board enable the user to control the instrument 7 PS Board This board contains a switch mode power supply w...

Page 12: ...t i o n s J2003 J2005 J2004 J2006 J2007 J7004 J7003 W9005 P9004 W9004 J2005 W9003 W9001 W9002 W6001 W6002 W6003 W4502 J1009 J1008 J1002 P4002 P4003 P4007 P4006 P4004 P4005 W6004 YP Board CR Board FC...

Page 13: ...ection Pin Name 1 LEVEL 2 LL_P 3 LL_N 4 SLOPE_P N 5 DC_ON 6 TV_ON 7 LF_ON 8 TRIG_AT N 9 AC_ON 10 TR_LED 11 SR1 12 SR2 13 LINE 14 SR5 15 XY 16 SR10 17 SC2 18 SH0 19 SC3 20 T_VAR 21 X_MAG 22 HOFF_VAR 23...

Page 14: ...emove the protection screening shield 6 Press connector D and pull the ribbon cable out 7 Remove the 3 nuts marked E Attention Do not unscrew the 3 screws marked X in g 1 5 8 Remove screw and nut mark...

Page 15: ...lt accuracy check 5 Y plate voltage check 13 Due to the in uence of the supply voltages on all circuitry it is recommended to make a complete Performance Check as described in this Service manual FC B...

Page 16: ...rked C 7 Unsolder the trace rotation coil wires marked D and keep the colour allocation in mind Attention Do not unscrew the 4 screws marked X in g 9 8 Replace the FC board and follow the previous ins...

Page 17: ...loscope and switch it on 6 Please follow the instructions of the Adjustment Procedure HM303 6 in the following order item 1 RV1001 Adjustment of 146 Volt supply 2 175 Volt check 3 RV1003 Adjustment of...

Page 18: ...e the nuts A and B were mounted before do not obstruct the YP board removal Replace the YP board and follow the previous instructions in reverse order Connect power cable to the oscilloscope and switc...

Page 19: ...check 10 P2007 YGain CH I at 5 mV div 11 P2002 YGain CH II at 5 mV div 25 P2012 ADDition balance 32 CV9001 9002 RV9006 9005 Y Final Ampli er 38 Y Ampli er Bandwidth Check 39 RV9001 Component Tester Y...

Page 20: ...moving the CR board check that the power cable is not connected to the oscilloscope 2 Locate and identify TB board press connector A and pull the ribbon cable out 3 Locate and identify XY board press...

Page 21: ...d 2 kV acceleration voltage use suitable probes recommended by HAMEG Such measurements should be performed in the following way 1 Switch the oscilloscope off 2 Connect measuring instrument reference p...

Page 22: ...ted by the power supply It is highly recom mended to check the power supply output voltages before any other action The following steps show you what to do 2 1 Miscellaneous voltages Locate and identi...

Page 23: ...requency 2 3 2 kV Locate and identify Molex connector J1009 4 wires connecting the power supply board with the CR board by a ribbon cable See photo 2 6 Check that the probe and the measuring instrumen...

Page 24: ...instrument from mains line Remove the power supply shielding Unsolder the wire soldered to the protective earth PE connection at the inner side of the rear chassis marked by an earth symbol Remove all...

Page 25: ...fuse 3 1 3 Replace the power supply as described under item 2 6 and adjust the new power supply see item 2 7 in chapt Trou bleshooting 3 1 4 Security check Check that after PS board replacement the pr...

Page 26: ...oscilloscope on As no signal is applied at the INPUT CH I a bright spot should become visible in the screen centre If the spot is not visible switch the oscilloscope off do not remove both shorts and...

Page 27: ...in the section Board Replacement 3 2 16 Locate and identify the connector J2003 on YP board Press the connector and pull the 4 pole ribbon cable out If the trace is visible continue with item 3 2 17 I...

Page 28: ...rd as described in section Board Re placement Item Behavior of the Instrument Possible Reason What to do Remark 3 5 1 No trace in time base Yt mode Component Tester and XY mode OK Check that all pushb...

Page 29: ...ing channel is now visible continue with item 3 7 2 Otherwise continue with item 3 7 3 TheFCboardreplacement enables a fast check of the instrument control As the trace rotation coil is still soldered...

Page 30: ...he Instrument Possible Reason What to do Remark 3 9 1 Component Tester and or Cali brator defect Replace the CC board as described in section Board Re placement If the error is still present continue...

Page 31: ...put min 10 mV into 50 e g HZ620 5 Pre attenuator 2 1 1M parallel with 10 25 pF e g HZ20 6 2 50 BNC through termination e g HZ22 7 2 BNC cables 50 e g HZ34 8 50 6 dB splitter with 2 outputs 9 Video sig...

Page 32: ...V div in combination with Y MAG x5 results in 2 mV div Connect a 10 mVpp accuracy 0 1 1 kHz square wave signal via 50 cable to input CH I For 0 error the signal height is 5 div Press Y MAG x5 pushbutt...

Page 33: ...5 mV div in combination with Y MAG x5 results in 1 mV div Connect a 5 mVpp accuracy 0 1 1 kHz square wave signal via 50 cable to input CH II Note If HZ620 is used the minimum voltage is 10 mV without...

Page 34: ...tion to select channel II Check that input coupling CH II is set to DC Check that CH II variable gain knob is set to CAL posi tion Set time base to 2 ms div Check that input attenuator CH II is set to...

Page 35: ...utput voltage for 5 division signal height Check for leading edge without over or undershoot and at square wave top 16 3 CH II 10 1 Attenuator Set attenuator CH II to 50 mV div Increase the calibrator...

Page 36: ...OUT positi on Set TIME DIV knob to 0 1 s Connect a 0 1 s time mark signal or a 10 MHz sine wave signal accuracy 0 1 ppm or better to the input of CH I Turn CH I VOLTS DIV knob for a signal height of a...

Page 37: ...ence Set trigger coupling to DC and check that the trigger point trace start is in the same position reference as under AC coupling condition 30 CH II DC Triggering Press CH I II pushbutton IN positio...

Page 38: ...e wave signal 40 mVpp amplitude to input CH I and check for full screen de ection 80 mm at 5 mV div Set input attenuator CH I to 50 mV div and check for 8 mm display height Set trigger coupling to AC...

Page 39: ...150ns Output voltage 2mV 20 Volts in 1 2 5 sequence for 4 divisions of display amplitude and Time Mark Generator from 0 1 s div to 0 5s div Output min 10mV into 50 2 Programmable Synthesizer HM813x o...

Page 40: ...3 RV9002 X Gain Adjustment in XY Mode 34 RV4001 Trigger Symmetry 35 P2006 DC Triggering CH I 36 P2008 DC Triggering CH II 37 CV9001 9002 RV9006 9005 Y Final Ampli er 38 Y Ampli er Bandwidth Check 39 R...

Page 41: ...pect to ground chassis Replace power supply cover PS Board 1 RV1001 2 175 Volt check Locate and identify check point socket M9001 on XY Board Locate and identify pin 1 at socket M9001 Check that appro...

Page 42: ...both collectors together connected with the Y plates by a wire short The collectors are the centre leads of the transistors Switch the instrument ON Check that 85 Volt 2 V can be measured at the colle...

Page 43: ...gmatism correction Locate and identify R6024 on CR Board Connect a 1MHz square wave signal with 25mVpp at 50 HZ22 to input CHI Set time base to 0 1 s div Adjust FOCUS control for optimum sharpness Adj...

Page 44: ...ignal via a 50 cable and a 50 through terminator to input channel I Set input attenuator CH I to 5 mV div Set input coupling to DC Rotate variable gain knob clockwise to CAL position Set input couplin...

Page 45: ...Incorrect too high Correct 2 5 1 signal 2div 12 P2003 Channel I Y MAG x5 balance Locate and identify P2003 on YP Board Set input attenuator CH I to 5 mV div Press channel I GND pushbutton IN position...

Page 46: ...5 mV div Press channel I GND pushbutton IN position Set trace with Y POS I control to the horizontal centre line of the graticule Rotate variable gain knob of channel I continuously fully counter clo...

Page 47: ...pling to DC Set time base to 2 ms div Set attenuator CH I to 50 mV div Set amplitude calibrator output voltage to 0 5 Vpp 0 25 Vpp at the 2 1 pre attenuator output terminated with 1M oscilloscope inpu...

Page 48: ...Vpp 2 5 Vpp at the 2 1 pre attenuator output terminated with 1M oscil loscope input impedance Adjust C2009 for a at top Adjust C2010 for a leading edge without overshoot Repeat C2009 and C2010 adjustm...

Page 49: ...o select channel II Locate and identify P2015 on YP Board Connect a 10 mVpp 1 kHz square wave signal via a 50 cable and a 50 through terminator to input channel II Set input attenuator CH II to 5 mV d...

Page 50: ...00 Hz square wave CH II Press CH I II pushbutton IN position to select channel II Locate and identify P2014 on YP Board Connect a 25 mVpp 100 Hz square wave signal via a 50 cable and a 50 through term...

Page 51: ...CH II Press CH I II pushbutton IN position to select channel II Locate and identify P2009 on YP Board Set input attenuator CH II to 5 mV div Press channel II GND pushbutton IN position Set trace with...

Page 52: ...H II on YP Board Set input coupling to DC Set time base to 2 ms div Set attenuator CH II to 50 mV div Set amplitude calibrator output voltage to 0 5 Vpp 0 25 Vpp at the 2 1 pre attenuator output termi...

Page 53: ...balance Press DUAL pushbutton IN position Locate and identify P2012 on YP Board Set input coupling CH I and II to GND Move baseline channel I with Y POS I control 1 division above the horizontal cent...

Page 54: ...ntal graticule line in the lower half of the screen and remember the GND 0V positi on e g using the ground symbol displayed by the readout Locate and identify RV4005 on TB Board Locate and identify ch...

Page 55: ...0 5 s div and time base variable control to CAL position Set Time Mark Generator to 0 5 s pulse interval f 2 MHz and connect signal to CH I input Move trace with X POS control so that the rst time ma...

Page 56: ...check that more than 2 5 time marks per division are displayed Incorrect Correct Incorrect 2 5 1 2 5 pulses pro div 30 RV4003 50 ms div time base adjustment Set input attenuator CH I to 0 1 V div Loc...

Page 57: ...ty Locate and identify C9026 and C9027 2 wires close to the X nal ampli er transistors on XY Board Set time base to 0 5 s div Press MAG x10 pushbutton IN position Connect a 10mV 35 MHz sine wave signa...

Page 58: ...nput channel I Set input attenuator CH I to 5 mV div Rotate variable gain knob clockwise to CAL position Set input coupling to DC Press X Y pushbutton IN position Move both dots displayed close to the...

Page 59: ...switching the attenuator to 50 mV div Adjust RV4001 for a triggered signal display Press and release SLOPE pushbutton and adjust RV4001 for correct triggering on both SLOPE conditions Reduce signal he...

Page 60: ...P2008 on YP Board Connect a 50 kHz sine wave signal to input CH I Set time base to 5 s div Set generator amplitude for a display height of 8 divi sions Check that input coupling CH I is set to AC Set...

Page 61: ...he removed cabinet place a metal plate over the XY board to compensate the missing capacities to ground cabinet Adjust RV9005 and CV9002 for fast leading edge with minimum overshoot Adjust RV9006 and...

Page 62: ...Ampli er Bandwidth Check under channel II conditions CH I 50 kHz CH I 3dB 35 MHz CH II 50 kHz CH II 3dB 35 MHz 39 RV9001 Component Tester Y Offset Press COMP Tester pushbutton IN position Check that...

Page 63: ...on and continue with item 41 Correct Incorrect Incorrect 41 RV4501 Component Tester trace inclination Check that the baseline is displayed exactly parallel to the horizontal centre line of the graticu...

Page 64: ...knob clockwise to CAL position Set input coupling to DC Press X Y pushbutton IN position Adjust the generator amplitude for 8 div trace length on the screen Increase the generator frequency until the...

Page 65: ...ulses Now approx 2 5 frames should be visible Change polarity of the video signal Press SLOPE pushbutton IN position Again approx 2 5 frames should be displayed triggered Set time base to 20 s div for...

Page 66: ...00 100 Reg Nr 071040 QM sales hameg com Oscilloscopes Spectrum Analyzer Power Supplies Modular System Series 8000 Programmable Instruments Series 8100 w w w h a m e g c o m 43 2030 2010 Subject to cha...

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