175A - HP Archive

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Section V Paragraphs 5-47 to 5-50 Figure 5-6. Attenuator Compensation (Top: undercompensated, Middle: compensated, Bottom: overcompensated) s. Disconnect 600-ohm Square- Wave Generator output from foam-covered wire and connect Generator to HORIZ INPUT. Adjust output amplitude for 8 cm deflection and frequency to 4 kc. t. Adjust Attenuator Compensation C203 for round dots with no tails (see figure 5-6). u. Disconnect Square- Wave Generator and jumper from vertical INPUT and sweep-generator printed- circuit board. Connect foam-covered wire to sweep- generator printed-circuit board. 5-47. SWEEP GENERATOR. 5-48. Refer to figure 5-3 for locationof adjustments. 5-49. PRESET. a. Set: HORIZONTAL DISPLAY ......... XI SWEEP TIME ......... lOpSEC/CM b. Connect DC Voltmeter to pin 3 of V109. This voltage will be approximately -40 volts. c. Rotate SWEEP MODE slowly clockwise while watching Voltmeter. Meter pointer will jump when sweep generator free runs. . d. Note voltage at which sweep generator free runs (maximum negative reading obtained on Voltmeter). e. Set: SWEEP MODE. ........... PRESET f. Adjust Preset Adj R170 for meter reading of 2.5 volts less negative than voltage noted in step d. 5-10 g. Disconnect Voltmeter. Model 175A 5-50. TRIGGER SENSITIVITY AND SYMMETRY. a. Set: SWEEP MODE ........... PRESET TRIGGER SLOPE ............. (-) TRIGGER SOURCE ......... EXT AC HORIZONTAL DISPLAY ......... X1 SWEEP TIME. ......... 1MSEC/CM Vertical SENSITIVITY. .. 0.05 VOLT/CM Vertical AC-DC ............. AC b. Connect Model 10003A (AC-21M) Probe from vertical INPUT to case of tunnel diode CR102 on sweep-generator circuit board (see figure 5-3). CAUTION: +110 VOLTS present at this point. c. Connect Calibration Generator to TRIG INPUT and adjust output for 0.05 volt rms. d. Mechanically center Trigger Symmetry R116, and turn Trigger Sensitivity R120 fully clockwise. e. Rotate TRIGGER LEVEL to obtain a free running display approximately 0.5 volt in amplitude (see figure 5-7). Figure 5-7. Trigger Sensitivity (Top: Synchronized, Bottom: Free Running) f. Using TRIGGER LEVEL to maintain a presen- tation adjust Trigger Sensitivity R120 counterclockwise until a stable, synchronized, symmetrical square wave approximately 0.35 volt in amplitude is obtained (see figure 5-7). g. Set Calibration Generator output to 0.03 volt rms. h. The trigger circuit should not trigger solidly. Counterclockwise adjustment of Trigger Sensitivity RH0 may be necessary to prevent solid triggering. Rotate TRIGGER LEVEL when checking for solid triggering. i. Set Calibration Generator output to 0.05 volt rms. j. The trigger circuit should again trigger solidly. Adjust TRIGGER LEVEL if necessary. Repeat steps f, g, h, and i until circuit triggers solidly with a 0.05-volt rms input and does not trigger solidly with a 0.03-volt rms input. 01526-1
Model 175A Section V Paragraphs 5-51 to 5-56 k. Set: TRIGGER SLOPE (+) m. Ground green/orange wire which is connected to TRIGGER SLOPE switch. n. Adjust Trigger Symmetry R116 for a symmetrical square wave display. p. Unground green/orange wire. Disconnect probe from CR102 and vertical INPUT. Disconnect Cali- bration Generator. 5-51. SWEEP LENGTH. a. Connect Square- Wave Generator 75-ohm output to vertical INPUT, and set frequency to 1 mc. b. Set: HORIZONTAL DISPLAY. ........ X1 TRIGGER SOURCE. ........... INT TRIGGER LEVEL ............. 0 SWEEP MODE ........... PRESET SWEEP TIME. ......... lMSEC/CM c. Set Square Wave Generator output and vertical SENSITIVITY for approximately 3 cm of deflection. d. Adjust Sweep Length R161 for 11 cm of sweep. e. Disconnect Square-Wave Generator. 5-52. SWEEP TIME. a. Connect Time-Mark Generator to vertical INPUT. b. Set: HORIZONTAL DISPLAY .......... X1 SWEEP MODE ........... PRESET TRIGGER SOURCE ........... INT c. Set vertical SENSITIVITY and TRIGGER LEVEL for a suitable display, and set SWEEP TIME and marker interval as shown in table 5-4. Make the corresponding adjustment for the indicated markers per centimeter if necessary. d. Disconnect Time-Mark Generator. SWEEP TIME .1 ~SEC/CM .2 ~SEC/CM .5 LLSEC/CM 1 IJ.SEC/CM io ~SEC/CM .I MSEC/CM 1 MSEC/CM io MSEC/CM .I SEC/CM 01526-2 Table 5-4. Sweep Time Markers Adjust 10 mc C125 5 mc C1016 1 psec C1014 1 psec c1012 10 psec ClOlO 100 psec R1005 1 msec R1004 10 msec R1003 100 msec R1002 Set for 1 cycle/cm 1 cycle/cm 1 marker/2 cm 1 marker/cm 1 marker/cm 1 marker/cm 1 marker/cm 1 marker/cm 1 marker/cm 5-53. =TICAL AM PJn- 5-54. Refer to figure 5-2 for location of adjustments. 5-55. GAIN. a. Install Model 10404A Vertical Test Adapter into vertical plug-in connector 51 in place of vertical plug-in unit. b. Connect 1.0 volt peak-to-peak from Calibration Generator to Test Adapter and adjust position control on adapter for on-scale trace. c. Adjust Gain R45 for 5 cm deflection. d. Remove Test Adapter and install vertical plugin unit. 5-56. SCAN RESPONSE. a. Connect Square-Wave Generator 75-ohm output to vertical INPUT and set frequency to 50 kc. b. Set Square-Wave Generator 75-ohm output and vertical SENSITIVITY for 6 cm of deflection. c. Trigger Test Oscilloscope with 600-ohm output of Square- Wave Generator. d. Remove horizontal plug-inunit fromModel175A and install Test Plug described in paragraph 5-28. e. Observe signal on pin 15 of horizontal plug-in connector 5105. Use probe on Test Oscilloscope to minimize loading. f. Adjust Scan Response C36 for best square wave as viewed on Test Oscilloscope. g. Observe signal on pin 13 of horizontal plug-in connector 5105. h. Adjust Scan Response C37 for best square wave as viewed on Test Oscilloscope. i. Set frequency of Square- Wave Generator to 1 mc. j. Observe signal on pin 10 of Test Plug. k. Adjust Scan Balance C33 for best balance as viewed on Test Oscilloscope (see figure 5-8). Figure 5-8. Scan Balance (Top: Unbalanced Middle: Balanced, Bottom: Unbalanced) I 5-11
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 18 and 19: Section Iv Figure 4-1 Q\ j j iqpm-1
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 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
Page 68 and 69: I I? .A N d N v1 .A 0
Page 70 and 71: Section V Figures 5-29 and 5-30 SCH
Page 72 and 73: I I CR483 c482 Ck463 I CR443 1" a46
Page 74 and 75: i C a I -- n I n > N t ij I- A Y D
Page 76 and 77: Section V Figures 5-34 to 5-36 5-38
Page 78 and 79: Model 175A Section VI Paragraphs 6-
Page 80 and 81: Model 175A Section VI Table 6-1 Ref
Page 82 and 83: Model 175A Reference Designation C3
Page 84 and 85: Model 175A CR304 Ck420 CR421 Cli422
Page 86 and 87:
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
Page 92 and 93:
Model 175A Reference De sienation t
Page 94 and 95:
Model 175A Section VI Table 6-1 Ref
Page 96 and 97:
Model 175A Reference Designation v2
Page 98 and 99:
Model 175A Section VI Table 6-1 Ref
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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
Page 110 and 111:
CRT WARRANTY CLAIM FROM: DATE: NAME
Page 112 and 113:
@ AUTHORIZED SALES AND SERVICE OFFI
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