175A - HP Archive

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Section Iv Figure 4-1 Q\ j j iqpm-1 4-b \ \ I 1 I I I VERTICAL POSITION^ ‘\ I I ! I CHANNELA~:~ >= ro pKiq DUAL TRACE pGiF] AMPLIFIER CHANNEL B 4-0 CALIBRATOR SUPPLIES / r--J / / CRT VERTICAL V€RT/ CA L AMPLl F I ER DEFLF~~~N PL A ms A WPLl Fl ER I- PLATES TO CRT HOR fZON TAL D€FL€cr/oN I 6 [HORIZONTAL DISPLAY^ 6 \EXTERNAL VERNIER] POWER Figure 4-1. Overall Block Diagram of Model 175A with Model 1750A Plug-In Unit Model 175A .I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I / / ITRACE ALIGNMENT] IASTIGMAT ISM I I75 A- 8-4 01526-2
Model 175A 4-1. OVERALL FUNCTIONAL DESCRIPTION. 4-2. The Model 175A consists of a high- and a low- voltage supply, a vertical and a horizontal amplifier, a sweep generator and a calibrator. Bothpower supplies are regulated, as is the dc heater supply. Op- tions include a gate- and sweep-output circuit not included in the standard instrument. Figure 4-1 shows a block diagram of the instrument illustrating the main functional units and controls. For clarity, a dual-trace plug-in amplifier has been shown as part of the diagram. The circuits of the plug-in units are described in the manuals for those instruments. Cir- cuit diagrams of the Model 175A are shown in figures 5-19 to 5-37. 4-3. VERTICAL AMPLIFTER. The vertical amplifier delays the signal received from the dual-trace amplifier and applies the amplified signal to thever- tical deflection plates of the crt. Before the signal is delayed, the vertical amplifier applies part of the signal to the sweep generator for internal triggering of the sweep. 4-4. SWEEP GENERATOR. The sweep generator accepts a trigger signal from an internal or external source and generates a fast-rising trigger which is synchronized with the trigger signal. The trigger starts the linearly rising sweep voltage which drives the beam horizontally across the crt screen. The sweep generator thus provides a linear time base on which to measure the vertical signal. The sweep generator also provides an unblanking pulse to turn on the crt beam during the sweep. 4-5. HORIZONTAL AMPLIFIER. The horizontal amplifier converts the internal sweep or external VERTICAL I NPUT SIGNAL CATHODE FOLLOW E R PLUG-IN 01526-2 DELAY LINE --* SECTION IV PRINCIPLES OF OPERATION INPUT AMPLIFIER - CATHODE CATHODE AMPLlF I ER FOLLOW E R FOLLOWER + v4 DRIVER v3 v7 Section IV Paragraphs 4- 1 to 4- 10 signal from unbalanced to balanced, and amplifies the signal to the level required to drive the horizontal deflection plates of the crt. 4-6. CALIBRATOR. The calibrator multivibrator generates a square wave of about 1 kc with 1-volt and 10-volt outputs. 4-7. HIGH-VOLTAGE POWER SUPPLY. The high- voltage power supply is an rf oscillator-rectifier circuit which generates the three regulated dc voltages required for operation of the crt. 4-8. LOW-VOLTAGE POWER SUPPLIES. Oper- ating voltages for all the oscilloscope circuits, in- cluding the high-voltage supply, are provided by the low-voltage power supplies. All dc voltages are regulated. 4-9. VERTICAL AMPLIFIER. 4-10. The vertical amplifier is a conventional balanced differential amplifier. The block diagram is shown in figure 4-2. The amplifier receives the balanced signal from the plug-in vertical amplifier, amplifies the signal, and drives the vertical deflection plates of the crt. The circuit includes a delay line which delays the vertical signal 0.2 psec before applying it to the vertical plates of the crt. Prior to the delay line, the signal from one side of the amplifier is sampled, amplified and applied to the sweep generator for internal triggering of the sweep. This starts the sweep in advance of arrival of the vertical signal at the crt deflection plates. The delayed signal is also applied to horizontal plug-in connector 5105 for use in the Model 1782A Display Scanner. 1 VERTICAL OUTPUT OUTPUT AMPLIFIER TO CATHODE-RAY TUBE TRIGGER SIGNAL TO SWEEP GENERATOR THROUGH TRIGGER-SOURCE CATHODE FOLLOWER SWITCH SI02 DISPLAY -8 -7 SCAN NE R Figure 4-2. Vertical Amplifier Block Diagram 4-1
Page 1: HP Archive This vintage Hewlett Pac
Page 4 and 5: Table of Contents Model 175A Sectio
Page 6 and 7: Section I Figure 1-1 1-0 Figure 1-1
Page 8 and 9: Section I Table 1-1 and Figure 1-2
Page 10 and 11: 1 . Section I Paragraphs 1-9 to 1-1
Page 12 and 13: Section III Model 175A Figure 3-1 p
Page 14 and 15: Section 111 Figure 3-2 1. Set INTEN
Page 16 and 17: Section 111 Model 175A Figure 3-4 @
Page 20 and 21: Section IV Paragraphs 4-11 to 4-29
Page 22 and 23: Section IV Paragraphs 4-34 to 4-41
Page 24 and 25: Section IV Paragraphs 4-47to 4-56 V
Page 26 and 27: ! I 5 Section V Table 5-1 - Item -
Page 28 and 29: Section V Paragraphs 5-13 to 5-17 i
Page 30 and 31: Section V Paragraphs 5-21 to 5-32 5
Page 32 and 33: Section V Figure 5-2 5- 6 -R45 GAIN
Page 34 and 35: Section V Paragraphs 5-40 to 5-42 c
Page 36 and 37: Section V Paragraphs 5-47 to 5-50 F
Page 38 and 39: Section V Paragraphs 5-57 to 5-60 m
Page 40 and 41: Section V Paragraphs 5-74 to 5-76 5
Page 42 and 43: Section V Paragraphs 5-77 to 5-85 S
Page 44 and 45: Section V Paragraphs 5-93 to 5-100
Page 46 and 47: Section V Table 5-9 (Cont'd) 15. Tr
Page 48 and 49: Section V Model 175A Figure 5-13 3E
Page 50 and 51: Model 175A 01526-2 (u a - R88 In I
Page 52 and 53: I R34 :i554 R36 7 c21 0 c23 C16 C25
Page 54: 2.: h(YN e a E -4 a e f
Page 58 and 59: - 2- a s; - a L C125 R143 R138 t 0
Page 60 and 61: Model 175A , 01526-2 SCHEMATIC DIAG
Page 63 and 64: RlOlO 0 d ncu 0 0 0 0 0 0 0 0 a a a
Page 66 and 67: c22 I " R234 R236 R2d R245 :215 R24
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I I? .A N d N v1 .A 0
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Section V Figures 5-29 and 5-30 SCH
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I I CR483 c482 Ck463 I CR443 1" a46
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i C a I -- n I n > N t ij I- A Y D
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Section V Figures 5-34 to 5-36 5-38
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Model 175A Section VI Paragraphs 6-
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Model 175A Section VI Table 6-1 Ref
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Model 175A Reference Designation C3
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Model 175A CR304 Ck420 CR421 Cli422
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Model 175A L105 L106 LZOO L20 1 L20
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Model 175A R6O R61 R62 R63 R6Y I365
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Model 175A n177 R178 R179 Rl8O Rl8l
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Model 175A Reference De sienation t
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Page 96 and 97:
Model 175A Reference Designation v2
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Model 175A @ Stock No. 0140-0034 01
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I Model175A Section VI Table 6-2 @
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Model 175A @I Stock No. -~ 0773-000
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Model 175A - @ Stock No. 5060-0765
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Model 175A Cod. No. 01216 01413 816
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CRT WARRANTY CLAIM FROM: DATE: NAME
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@ AUTHORIZED SALES AND SERVICE OFFI
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