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MANUAL

Oscilloscope

HM 2 0 3

M E S S T E C H N IK

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Summary of Contents for HM 203

Page 1: ...MANUAL Oscilloscope HM 2 0 3 M E S S T E C H N IK...

Page 2: ...tion adjustable on front panel Calibrator square wave generator 1kHz for probe compensation Output 0 2V 1 Regulated DC power supplies all operating voltages including the high voltage Protective syste...

Page 3: ...lifier input stages utilize monolithic integrated circuits to minimize drift Exact measurement of the displayed waveform is achieved by the 12 step frequen cy compensated input attenuator calibrated i...

Page 4: ...ith sprung hook 1C tip insulating tip and BNC adapter HZ32 Test Cable BNC 4mm Coaxial test cable with BNC male plug at one end and shielded banana plug at the other Cable length 1 15m Cable capacitanc...

Page 5: ...ox 4 5cm In addition problems of time resolution also arise For example with 25MHz and the fastest ad justable sweep rate 40ns cm one cycle will be displayed every 1cm The tolerance on indicated value...

Page 6: ...strument into operation The instrument should be placed in a clean and dry room In other words the instrument may not be put into operation in explosive corrosive dusty or moist environments The instr...

Page 7: ...ambient light conditions should be used Particular care is required when a single spot is displayed as a very high intensity setting may cause damage to the fluorescent screen of the CRT Switching th...

Page 8: ...which can be used for triggering This occurs for example with burst signals To obtain a stably trig gered display in these cases it may be necessary to use Normal Triggering and or the TIMEBASE varia...

Page 9: ...2cm max 8cm max deflection coefficient D 62 2 3 2 19 4V cm min deflection coefficient D 62 2 8 7 8V cm adjusted deflection coefficient D 10V cm If the applied signal is superimposed on a DC direct vo...

Page 10: ...1 5 625 10 5 6 4cm Sine wavelength L min 4cm max 10cm Frequency F 1kHz max time coefficient Tc 1 4 103 0 25ms cm min time coefficient Tc 1 10 103 0 1 ms cm set time coefficient Tc 0 2ms cm required wa...

Page 11: ...for the input of the oscilloscope amplifier It should be noted that all attenuator probes must be compensated in conjunction with the oscilloscope see Probe Adjustment page M4 If a X I 0 or X I 00 at...

Page 12: ...H input attenuator and variable control This means that the sensitivity ranges and input impedances are identical for both the X and Y axes However the Y POS II control is disconnected in this mode It...

Page 13: ...ynchronization pulses contained in the signal The line pulses can be at tenuated by switching the TRIGGER SELECTOR switch in the X Section to LF With Normal Triggering and cor rect setting of the slop...

Page 14: ...pushbutton in the front panel section below the CRT screen Then both vertical preamplifiers and the timebase generator are switched off Nevertheless signal voltages at the three BNC connectors on fron...

Page 15: ...ction or short circuit which from experience is needed frequently Testing Diodes Normal diodes show at least their knee in the forward characteristic This is not valid for some high voltage diode type...

Page 16: ...sulated CT socket avoiding hum distortion of the test pattern Another way is a test pattern comparison to an operating circuit with the same circuit diagram likewise without power and any external con...

Page 17: ...gle Transistors Junction B E Capacitor 33 F Junction E C FET In circuit Semiconductors Z diode beyond 12V Diode paralleled by 680fi 2 Diodes antiparallel Germanium diode Thyristor G A together Diode i...

Page 18: ...FRONT VIEW...

Page 19: ...sed These both internal trigger modes are valid also for dual channel operation External triggering from TRIG EXT connector small TRIG EXT button pressed External trigger signal 0 6 10Vpp time related...

Page 20: ...without any tolerances is practically impossible Astigmatism Check Check whether the horizontal and vertical sharpness of the display are equal This is best seen by displaying a square wave signal wit...

Page 21: ...the front of the amplifier are frequency compensated in each position Even small capacitive changes can reduce the transmission perfor mance Faults of this kind are as a rule most easily detected wit...

Page 22: ...TV triggering is possible with a video signal of any given polarity In the LF position only reliable triggering on frame frequency is possible However triggering on line horizontal scanning fre quency...

Page 23: ...le control in C position measurement in the 50yt s cm range Component Tester After pressing the CT button a horizontal straight line has to appear immediately when the CT socket is open The length of...

Page 24: ...rmly held the entire chassis with its front panel can be withdrawn forward When the chassis is inserted into the case later on it should be noticed that the case has to fit under the flange of the fro...

Page 25: ...e FOCUS control knob has to be repeatedly turned to and fro until the shape of the luminous spot whether round or oval or rectangular stays the same to the right and left of the optimum focus ing The...

Page 26: ...tage circuit must have sufficient electric strength Capacitors without a voltage value must be rated for an operating voltage of 63V The capacitance tolerance should not exceed 20 Many semiconductors...

Page 27: ...th the aid of the Circuit Diagrams and Ad justing Plan However a complete recalibration of the scope should not be attempted by an inexperienced operator but only someone with sufficient expertise Sev...

Page 28: ...BASIC BLOCK DIAGRAM OF THE HM 203 4 The number in the block indicates the relevant circuit diagram...

Page 29: ...stor fixed S Switch T Transistor Silicium TR Transformer VC Variable capacitor VR Variable resistor W Wire Z Z Diode Meaning of Connection Abbreviations Trigger Board P2 3 1 1 6 m u 3 n Plug Socket CR...

Page 30: ...D3 5 8 3 MM 2U 3 4 Y IIMPUI AIMU A I EIMUATUR U H I AIM UH II C H II...

Page 31: ...o 12V 5V E Y 21 EY22 12V AU connections on XY Board Y Section A l connections on XY Board TY Section...

Page 32: ...T W2 5 1 3 7SV from Z Board R512 24V to Z Board W2 5 1 Y1 to Z Board W2 5 1 Y2 to Z Board W2 5 1 12V from Z Board W2 3 2 X from S370 i l W2 5 1 12V from Z Board 1 24V int to S370 l W2 3 2 Altern Pulse...

Page 33: ...6 R2029 VR282 R288 R2031 VR2021 R287 R2033 R289 R2026 R290 R2028 R291 R2030 R292 R2036 R293 VR281 R2021 R2022 R2001 R2013 R2002 R2014 R2003 VR2001 R2004 VR2011 R2005 R2006 R2011 R2012 C 210 C255 C 205...

Page 34: ...D6 5 83 TRIGGER CIRCUIT TIMEBASE CIRCUIT X FINAL AMPLIFIER LV POWER 12VT TRACE ROTATION HM 203 4 TRIG EXT TRIG EXT LED 001 from LV Power BR2071 W2 6 1 bl dpprcx 1CCJ1 1C0C turns X MAGN X5...

Page 35: ...0 9 R 3 0 2 3 V R 3001 R 3 11 2 R31 15 R 3 18 R 3 7 1 V R 3 52 R 382 R 3 0 2 4 R 3 0 1 3 R 3061 R 3 1 1 7 R31 16 R 3 02 6 C 3 0 0 C 3 3 0 i C 301 C 3 5 5 C 3 59 C 3 4 0 C 371 C 3 02 1 C 3 7 3 C 3 0 2...

Page 36: ...UNBLANKING CIRCUIT CRT CIRCUIT HM 203 4 R3117...

Page 37: ...rd Y FINAL AMPLIFIER HM 203 4 Z Board WO 5 1 from Power Transform er 1 V bk bk J COMPOMENT LOCATIONS Z BOARD Rear chassis W S 6 1 1 D3 to CRT 600 trp W5 6 1 1 D4 to CRT 600 WO 5 1 1 bk 12V from Power...

Page 38: ...6 POWER TRANSFORMER TR 001 031 0018 POWER AC 50 60Hz POWER FUSE LINKS Type IEC 127 111 DIN 41662 SEV 1064 BS 4265 5 x20 mm time lag 110V 125V 220V 240V T 0 63 A T0 315A WATTS max I 40 AMPS max I 0 2 a...

Page 39: ...CH II CRT Board CAL ru 0 2Vpp CRT Board TS Board wiring side Calibrator IC2001 4x1 1 HEF4011BP C2004 01 I 10p 35V R2005 o 6R8 5V R2003 D 1SK C2001 E001 j W O 2 1 o VR2001 _ L T R2004 R2006 100 6 7 Cal...

Page 40: ...n Check preamp output on EY21 PII 2 1 1 with test scope via 10X probe Adj VR151 for approx 360mVpp on EY21 Then adj VR212 for a display of 4cm on HM 203 4 screen X gain tCH H Set AC input coupling rel...

Page 41: ...nt side m h m VR103 VR151 Sym Ch ll 1 1 VR 101 Sym Ch 1 1 1 VR150 1 1 VR100 Preampl g Preampl f v A Gain Ch ll 1 X 1 Gain Ch 1 1 N I Input DC Balance Input DC Balance Ch II v Ch l r WinV g 20mV J 10mV...

Page 42: ...R3104 Forward curr adj ChPIO VR3050 HV adj 1900V at ChP9 VR3001 VC 3020 Sweep rate catibr Sweep length adj previously 50 iS cm position HM 203 4 ADJUSTING PLAN PLAN D AJUSTAGE ABGLEICHPLAN PLAN DE AJU...

Page 43: ...nue de la R6publique 94800 VILLEJUIF T6I 1 678 09 98 T6lex 270705 D 0E C M 1E E E Espada IBERICA S A Villarroel 172 174 BARCELONA 36 Tel 230 15 97 D 0 E M E ES United Kingdom LTD 74 78 Collingdon Stre...

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