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5 . 6 -2
UNIT DESCRIPTIONS
To reduce the switching losses in
V1019, a dV/dt limiter, often called
“snubber", is used. C1021 decreases
the dV/dt of the collector voltage of
V1019 during switching off, as the
current to the transistor can pass
during a certain time through C1021.
This slowing down of the collector
voltage will reduce the switching
losses during switching off. During
the ON cycle, the energy in C1021 is
transferred to L1006 and the
capacitor is discharged. During the
OFF cycle, the energy in L1006 is
transferred to C1018 and during the
next ON cycle, the energy in C1018 is
delivered to the transformer. In that
way, no energy is wasted. As a
consequence of this system, the
voltage at the transformer is slightly
increased during the first part of the
ON cycle, but this has no
disadvantages.
Voltage regulation takes place by varying the control voltage from R1046 to the gate of V1014. A
more positive voltage will cause a smaller peak current through the transformer and this results in
smaller output voltages. The converter frequency can be 20 to 50 kHz. This depends on the mains
voltage and the load of the power supply. The lower the mains voltage, the lower the frequency. A
lower load means a higher frequency. R1018 compensates for gate-cathode voltage variations of
V1014 due to the temperature.
Line trigger circuit
For triggering purposes, a sinusoidal signal at the mains frequency is available. Of course there will
be no LINE signal if the mains voltage is DC.
A small signal is picked up with capacitors C1002, C1003, C1004 and C1006 and amplified in N1046.
This results in output signal at pin 1. This circuit provides a sine-wave with low distortion and with an
amplitude of 3 to 8 V, depending on the mains voltage.
Diagram 2
Diagram 2 comprises the following circuit parts:
- trace rotation control
- fan control
- illumination control
- EHT converter
Trace rotation control
To supply the trace rotation coil, of which the resistance is about 200 Q, a voltage of -10 V to +10 V
is created in amplifier V1146-1147. Control takes place via a part of N1101 by means of the signal
DAC3 which can be 1 to 10 V, together with the signal DAC0 with a level between 1 and 3V. The
signals DAC3 and DAC0 originate from the microprocessor unit A3.
Fan control
The speed the cooling fan depends on the temperature in the oscilloscope. This temperature is
measured at the microprocessor unit A3 by a NTC resistor. The microprocessor generates the signal
DAC1 with a level of about 1.7 to 4 V. The fan is supplied by amplifier V1148 which is controlled by
this signal. The output from the amplifier is a DC voltage of -10 to +10 V.
Figure 5.6
Timing diagram converter circuit
Содержание PM3082
Страница 34: ...DESCRIPTIONS 3 1 ST8235A 970415 ...
Страница 35: ...DESCRIPTIONS r _A1 SIGNAL UNIT TRIGGERING ...
Страница 36: ...3 1 TIME BASES ST8235A 970415 ...
Страница 37: ...3 2 DESCRIPTIONS ST82358 97041S ...
Страница 38: ...XYSW ...
Страница 79: ...5 1 22 UNIT DESCRIPTIONS Lay out 2 Small component side of signal unit A1 ...
Страница 93: ...5 1 33 09001 2 01201 3 01201 5 C 1 O 6 0 T 10n A1 Diagram 1 Attenuator CH 1 PM3094 PM3092 ...
Страница 95: ...1 5 0 0I AC DC HIGH IMPEDANCE ATTENUATOR R20Q2 12AT2 l i C2005 180u C2O06 1 0 n 12AT2 l i C2068 10n ...
Страница 96: ...5 1 34 UNIT DESCRIPTIONS 09001 17 A1 Diagram 2 Attenuator CH 2 PM3094 PM3092 ...
Страница 99: ...5 1 35 X I STB241 970420 A1 Diagram 2a Attenuator CH 1 PM3094 PM3092 ...
Страница 100: ...5 1 36 UNIT DESCRIPTIONS 12AT3 12AT3 STQ24S 970420 Diagram 3 Attenuator CH 3 PM3094 ...
Страница 101: ...J a C3077 I I T b M A AT350C N1101 2AT3 12AT3 ...
Страница 102: ...5 1 36 UNIT DESCRIPTIONS 12AT3 STB242 970420 Diagram 3 Attenuator CH 3 PM3094 ...
Страница 103: ...UNIT DESCRIPTIONS K x jr w o n m 310 I B4012 E OPT i I C406S I C4067 1 M u 0 4 0 8 6 L 1 8 0 u 25V i r i K4001 ...
Страница 104: ...5 1 37 12AT4 D4201 3 D4201 5 ST8243 97D420 Diagram 4 Attenuator CH 4 PM3094 ...
Страница 105: ...UNIT DESCRIPTIONS C4071 lOn C4072 lOn AC DC f HIGH IMPEDANCE ATTENUATOR LF IMPE CONVE R40Q2 ...
Страница 106: ...5 1 37 100 T I C4071 lOn 12AT4 04201 3 04201 5 m C4068 lO n STB243 970420 Diagram 4 Attenuator CH 4 PM3094 ...
Страница 107: ... 12AT 12AT4 l i C4067 160u 25V C4068 10n K4002 ...
Страница 109: ...I i 04097 1 0 O u 25V J 25V 10n 25V ...
Страница 111: ...UNIT DESCRIPTIONS PROBE CALIBRATOR GNDREF IOVREF j C 1 5 180u 25V J 25V C1157 100n GNDREF GNDREF ...
Страница 113: ...UNIT DESCRIPTIONS PROBE CALIBRATOR GNOR6F f 1CVREF f C11S0 180u 25V C1157 10 0n GNDREF GNDREF ...
Страница 115: ...5 1 40 UNIT DESCRIPTIONS Diagram 6 Preamplifier CH 1 and CH 2 ...
Страница 116: ...PAOREF N32Q2 12 ...
Страница 117: ...5 1 40 UNIT DESCRIPTIONS Diagram 6 Preamplifier CH 1 and CH 2 ...
Страница 118: ...UNIT DESCRIPTIONS 5 1 41 l GAIN CONTROLVAR X1 2 X5 Diagram 7 Preamplifier CH 3 and CH 4 ...
Страница 119: ...UNIT DESCRIPTIONS ...
Страница 120: ...5 1 41 PMVAR ft4220 Diagram 7 Preamplifier CH 3 and CH 4 ...
Страница 121: ...5 1 42 UNIT DESCRIPTIONS Diagram 8 Y functions ...
Страница 122: ... 12FNC12 I2R4C12 12FNC34 12FNC34 R1S13 1K47 FNC FI ...
Страница 123: ...5 1 42 UNIT DESCRIPTIONS 12FNC12 FM2MV 00003 7 12FNC12 H2FNC12 Diagram 8 Y functions ...
Страница 124: ...UNIT DESCRIPTIONS 10P 120LD REF VOLTAGE DG001 HEF40M I f 1 ...
Страница 126: ...UNIT DESCRIPTIONS 10PA AC 35mV DC 5V REF VOLTAGE CORR DLDDCLEVB 1 DLDDCLEVELO I R5050 51IK DS001 HEF40M D5001 HEF4066 ...
Страница 129: ... REF VOLTAGE j D5001 HEF4009 DS001 HEF40M If C0RHECT10N VOLT N5001 366 f ...
Страница 133: ...5 1 45 D5501 HEF4053 CNT STB251 970428 Diagram 10 Display and trigger control ...
Страница 138: ...5 1 47 Diagram 12 MTB trigger ...
Страница 140: ...5 1 48 UNIT DESCRIPTIONS TV SYNC SEPARATOR l TV UNE FRAME SELECTION Diagram 13 TV line trigger ...
Страница 142: ...5 1 48 UNIT DESCRIPTIONS TV SYNC SEPABATOtT TV UNE FRAME SEUECTKDN Diagram 13 TV line trigger ...
Страница 143: ...UNIT DESCRIPTIONS 5 1 49 160TR Diagram 14 DTB trigger ...
Страница 146: ...5 1 50 UNIT DESCRIPTIONS Diagram 15 Time base logic ...
Страница 148: ...5 1 50 UNIT DESCRIPTIONS V 6 0 0 4 Diagram 15 Time base logic ...
Страница 149: ...UNIT DESCRIPTIONS 5 1 51 Diagram 16 Main time base ...
Страница 150: ...UNIT DESCRIPTIONS R6001 ...
Страница 151: ...5 1 51 ...
Страница 153: ......
Страница 154: ...5 1 52 UNIT DESCRIPTIONS R716Y C7181 ONLY IN PM30Q2 PM3004 Diagram 17 Delayed time base ...
Страница 155: ...UNIT DESCRIPTIONS 5 1 53 X9001 I 1 D 0 O O 8 1 Diagram 18 Connectors ...
Страница 207: ...5 2 8 UNIT DESCRIPTIONS BFT92 W1p Lay out 2 Small component side of XYZ amplifier unit A2 200 MHz ...
Страница 208: ...n r i r 1 1 1 C33 d iM d id d iN dQN o e j d M l d A l d m 26id eSttfG Orfidfi 28d 128JS 0S848 sesifl 09S60S o w r a I ...
Страница 214: ...UNIT DESCRIPTIONS 5 2 13 5 2 5 Circuit diagrams A2 200 MHz version ...
Страница 215: ...UNIT DESCRIPTIONS 5 2 5 Circuit diagrams A2 200 MHz version 0501 22 ...
Страница 216: ...5 2 13 ...
Страница 217: ...5 2 14 UNIT DESCRIPTIONS A2 200 MHz Diagram 2 Final Y output stage ...
Страница 218: ......
Страница 219: ...5 2 14 UNIT DESCRIPTIONS STB263 970428 A2 200 MHz Diagram 2 Final Y output stage ...
Страница 223: ...5 2 16 UNIT DESCRIPTIONS AC20mV DC 10V AC 80mV OCMOV A2 200 MHz Diagram 4 Final Z amplifier ...
Страница 224: ...AC 60mV DC 1CV R3311 511E M20Q2 11 AST03 R3313 1 2KB7 V3311 ...
Страница 226: ...UNIT DESCRIPTIONS 5 2 17 A2 200 MHz Diagram 5 Modulator demodulator and focus control ...
Страница 227: ...UNIT DESCRIPTIONS FOCUS L i X2401 ...
Страница 228: ...5 2 17 A2 200 MHz Diagram 5 Modulator demodulator and focus control ...
Страница 231: ...8 5 ii 8 HI I Hl H s HI I i HI I ...
Страница 232: ...g I S 5 S I 1 H H r lr H J g if j r r 8 3 8 8 S 3 5 5 H H 5 3 r l r l H H n ft 3 S 5 8 a s 5 ...
Страница 268: ...UNIT DESCRIPTIONS 5 2 11 Circuit diagrams A2 100 MHz version ...
Страница 269: ...5 2 47 ...
Страница 270: ...5 2 48 UNIT DESCRIPTIONS TO CflT ...
Страница 271: ......
Страница 272: ...5 2 48 UNIT DESCRIPTIONS TO CRT D14 364GH 123 YFSHF R4191 VFSHF1 YFSHF2 A2 100 MHz Diagram 2a Final Y output stage ...
Страница 274: ...UNIT DESCRIPTIONS 12XNO DC LEVEL SHIFT XTEXT XZ CONTROL N2002 TOA 8444 LOCAL SUPPLY FILTERING 58XN0 5 a saxR ...
Страница 277: ... 12ZNO DC LEVEL SHIFT Z TRACS Z RIPPLE SUPPRESS LOCAL SUPPLY FILTERING 58ZN0 SfiZF saa R3411 N20 ...
Страница 279: ...UNIT DESCRIPTIONS 5 2 51 FOCUS LEVELSHIFTER A2 100 MHz Diagram 5a Modulator demodulator and focus control ...
Страница 280: ...UNIT DESCRIPTIONS X2411 ...
Страница 281: ...5 2 51 FOCUS LEVELSHIFTER A2 100 MHz Diagram 5a Modulator demodulator and focus control ...
Страница 284: ... ...
Страница 285: ...a 5 a I H rI 3 H H H 8 K fc 5 3 3 I I ...
Страница 308: ...t 0 0 0 0 0 0 0 0 0 3 sS cn 03 03 UNIT DESCRIPTIONS ...
Страница 310: ...R1102 R1101 R1679 R1672 R1071 R1104 B1674 u HI 406 H i402 D1402 O N j oo O O ai 5 3 ...
Страница 311: ...bc646c Up BC866C 3Lp ...
Страница 313: ......
Страница 317: ...UNIT DESCRIPTIONS 5 3 9 5 3 5 Circuit diagrams Diagram 1 Central processor unit ...
Страница 318: ...UNIT DESCRIPTIONS 5 3 5 Circuit diagrams ...
Страница 319: ...5 3 9 r i Diagram 1 Central processor unit ...
Страница 324: ...UNIT DESCRIPTIONS ...
Страница 325: ...5 3 11 Cl 968 T 1 0 0 n C1963 I80u Diagram 3 Potentiometer DAC and lEEE option h i m ...
Страница 326: ...5 3 12 UNIT DESCRIPTIONS G4 oi TEXT CURSOR CONTBOL 12MG Diagram 4 Text and cursor circuit i ...
Страница 328: ...5 3 12 UNIT DESCRIPTIONS G4401 12MG TEXT CURSOR CONTROL Diagram 4 Text and cursor circuit ...
Страница 342: ...UNIT DESCRIPTIONS 5 4 4 Unit lay outs TO X5201 ON CRT CONTROL A5 I O C O I D C G C I ...
Страница 344: ...UNIT DESCRIPTIONS 5 4 4 Unit lay outs TO X5201 ON CRT CONTROL A5 H cc c c IH ...
Страница 349: ...UNIT DESCRIPTIONS 5 4 7 5 4 5 Circuit diagrams CS801 10On cs 02 C5603 cseo J 10n ion ion 1 A4 Diagram 1 Front processor ...
Страница 352: ...5 4 8 UNIT DESCRIPTIONS REF NR TYPE 5VD L C 74HC5A1 20 10 CS0Q2 STB286 970428 A4 Diagram 2 Key matrix ...
Страница 354: ...5 4 8 UNIT DESCRIPTIONS REF NR TYPE 5VO C 05002 74HC841 20 10 csace STB2M 070428 A4 Diagram 2 Key matrix ...
Страница 360: ...sna iu o UNIT DESCRIPTIONS 5 5 3 5 5 3 Circiuit diagram X5201 A5 Diagraml CRT controls unit ...
Страница 367: ...UNIT DESCRIPTIONS 5 6 3 Unit lay outs TO X2401 ON ...
Страница 369: ......
Страница 371: ......
Страница 372: ... 00 o o O o ...
Страница 377: ...UNIT DESCRIPTIONS 5 6 5 Circuit diagrams G LI 001 fKfcjH ...
Страница 379: ...5 6 10 t ...
Страница 381: ... EHT CONVERT ...
Страница 383: ...UNIT DESCRIPTIONS OUTPUTCIRCUIT V1271 BYV29 T1001 T1001 T1001 now T1001 T1001 now now ...
Страница 385: ...UNIT DESCRIPTIONS OUTPUTCIRCUIT V1271 BYV20 T1001 T1001 T1001 T1001 T1001 T1001 TI001 T1001 REF ...
Страница 394: ...UNIT DESCRIPTIONS 5 7 1 5 7 RESERVED FOR FUTURE EXTENSIONS ...
Страница 395: ...UNIT DESCRIPTIONS 5 8 1 5 8 RESERVED FOR FUTURE EXTENSIONS ...
Страница 396: ...UNIT DESCRIPTIONS 5 9 1 5 9 RESERVED FOR FUTURE EXTENSIONS ...
Страница 397: ...UNIT DESCRIPTIONS 5 10 CONNECTOR BOARD A10 5 10 1 Unit lay out ...
Страница 399: ...UNIT DESCRIPTIONS 5 10 CONNECTOR BOARD A10 5 10 1 Unit lay out 28 27 O O X IAJ 2 1 ...
Страница 412: ...UNIT DESCRIPTIONS 5 11 3 Fig 1 Location of options Y out and external trigger ...
Страница 413: ...UNIT DESCRIPTIONS ...
Страница 414: ...5 11 3 Fig 1 Location of options Y out and external trigger ...
Страница 415: ...5 11 4 UNIT DESCRIPTIONS Fig 2 Printed circuit board lay out of Y out unit ...
Страница 417: ...UNIT DESCRIPTIONS 12V 12V 12V 12V X1003 YOP HX R1001 I 1 2 K 1 X1009 X1010 SCL ...
Страница 422: ...5 11 10 UNIT DESCRIPTIONS 01002 MTREXTSW HD CNT4MT HT Fig 4 Printed circuit board lay out of external trigger unit ...
Страница 425: ...UNIT DESCRIPTIONS C1002 33p DC LIMITER SUPPLY VOLTAGES X2011 T 12V X2012 R2061 f 4 E 7 C2061 S 47 Z 25V m C2062 0 0n 12 ...