HP-122A-Manual-SN_above_100 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by vvwvv. h parc Please visit us on the web ! Scanned by on-line curator: Tony Gerbic * For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 122A O S G l l l O S C O P E OPERATING AND SERVICING MANUAL RadioFans.CN 收音机爱 好者

2、资料库 OPERATING AND SERVICING MANUAL FOR MODEL 122A/AR OSCILLOSCOPE SERIAL 101 AND ABOVE Copyright HEWLETT-PACKARD COMPANY 1959 275 PAGE MILL ROAD, PAL0 ALTO, CALIFORNIA, U. S. A. 122AQ01 RadioFans.CN 收音机爱 好者资料库 Model 122A SPECIFICATIONS SWEEP Sweep Range: 15 Calibrated sweeps, accurate to within *5%,

3、 in a 1, 2, 5, 10, . sequence, 5 psec/cm to 200 millisec/cm. Vernier permits continuous adjustment 0 1 sweep time between calibrated steps and extends the 200 millisec/cm steF to at least 0.5 sec/c Sweep Expand: X5 sweep expansioil lllay uc; ust;u 1 psec/cm. accuracy is 40%. Automatic from 50 cps to

4、 mu KC; internally rrom vertical deflection signals causing 1/2 cm or more vertical deflection; from external signals 2.5 volts peak-to-peak or greater, and from line voltage. ail x a i i g c s and expands fastest sweep ta Expansion is about the center of the CRT and expanded sweep Synchronization:

5、Trigger Point: Control overrides automatic ailu ,F;Illllcu clIF; LILRRF;l to be set between -10 an r0 restores auto- matic I - - d +10 volts. Turning fully counterclockwise into AU1 Dperation. VERTICAL AMPLIFIERS Bandwidth: DC coupled: dc to 200 kc. AC coupled: 2 cps to 200 kc. Bandwidth is independ

6、ent of calibrated sensitivity setting. 10 millivolts/cm to 100 volts/cm. 4 calibrated steps accurate within *5%, 10 mv/cm, 100 mv/cm, 1 v/cm and 10 v/cm. Vernier permits continuous adjustment of sensitivitv between stem and extends 10 v/cm step to at least 100 v/cm. Sensitivity: Internal Calibrator:

7、 Calibrating signal automatically connected to vertical amplifier for standard- izing of gain, acc :uracy *2%. )ximately 50 ppf shunt capacitance. -:.-.-.-I - - - 1 : 1 : - - - L - - -L- 1 megohm,-apprc Input Impedance: Phase Shift: Vertical and hoi ilruiiLai amuiiiiers nave same unase characteristi

8、cs within *2 to 100 kc w I- then verniers are fully cw. Balanced Input: On 10 mv/cm r by approximate mode signal mi ange on both amplifiers. Input impeda :ly 25 ppf. Common mode rejectionis 1st not exceed *3 volts peak. nce, 2 megohms shunted at least 40 db. Common Difference Input: Both input signa

9、ls may I J swiccneu t o one cnannei to give differential input on all vertical sensitivity ranges. The sensitivity switches may be set sep- arately to allow mixing signals of different levels. Common mode rejection is at least 40 db with es on most sensitive range, 30 db on other ranges. Vertical Pr

10、esentation: Switch selects: A O L Y , B ONLY, B-A, ALTERNATE or CHOPPED. Model 122A SPECIFICATIONS (CONTD.) -IORIZONTAL AMPLIFIER Bandwidth: Sensitivity: Input Impedance: Phase Shift: SENERAL Cathode Ray Tube: CRT Bezel: CRT Plates: Intensity Modulated: Filter Supplied: Illuminated Graticule: Dimens

11、ions: Weight: Power: Accessories Available: DC coupled: dc to 200 kc. AC coupled: 2 cps to 200 kc. Bandwidth is independent of calibrated sensitivity setting. 0.1 volt/cm to 100 volts/cm. 3 calibrated steps, accurate within .5%, .1 v/cm, 1 v/cm, and 10 v/cm. Vernier permits continuous adjustment o f

12、 sensitivity between steps and extends 10 v/cm step to at least 100 v/cm. 1 megohm, nominal, shunted by approximately 100 wf. Horizontal and vertical amplifiers have same phase characteristics within *2 to 100 kc. 5AQPl mono-accelerator normally supplied; 2500 volt accelerating potential. P7 and P11

13、 phosphors are also available. P2 is available if desired for special applications. Light proof bezel provides firm mount for oscilloscope camera and is re- moved easily for quick change of filter. Direct connection to deflection plates via terminals on rear. Sensitivity approximately 20 v/cm. Termi

14、nals on rear. +20 v to blank trace of normal intensity. Color of filter compatible with CRT phosphor supplied: Green with P1 and P2 Amber with P7 Blue with P11. Edge lighted with controlled illumination, 10 cm x 10 cm, marked in cm squares. Major horizontal and vertical axes have 2 mm subdivisions,

15、Cabinet Mount: 9-3/4 in. wide, 15 in. high, 21-1/4 in. deep. Rack Mount: 19 in. wide, 7 in. high, 21-1/4 in. deep. 19-1/2 in. deep behind panel. Cabinet Mount: Net 35 lbs., shipping 51 Ibs. Rack Mount: Net 33 lbs., shipping 48 lbs. 115/230 volts +lo%, 50-1000 cps; approximately 150 watts. AC-83A Vie

16、wing Hood, face-fitting molded rubber. CONTENTS SECTION I GENERAL INFORMATION Page 1 . 1 General Description . i . 1 1 . 2 Damage in Transit . i . 1 1 . 3 Power Line Voltages . . . . . . . . . . . . . . . 1 - 1 1 . 4 Conversion for 230 Volt 0 . . . . . . . . . . . . . 1 - 1 1 . 5 Accessories Availab

17、le . . . . . . . . . . . . . . 1 - 1 SECTION I1 OPERATING INSTRUCTIONS 2 . 1 Controls and Terminals . I1 . 1 2 . 2 11 . 1 2 . 3 I1 . 1 2 . 4 Operating Drawings . I1 . 1 Vertical Amplifier Input Considerations . . . . . . . . . . . . . . Checking Horizontal Amplifier Gair Calibration . . . . . . . .

18、. . SECTION 111 CIRCUIT DESCRIPTION 3 . 1 General Content . . . . . . . . . . . . . . . . . . . . . . . . . . 111 . 1 3 . 2 Vertical Amplification Channels . . . . . . . . . . . . . . . . . . 111 . 1 3 . 3 Horizontal Amplification Channels . . . . . . . . . . . . . . . . . I11 . 2 High Voltage Power

19、 supply . 3 . 4 Sweep Generator . 111 . 3 3 . 5 111 . 3 3 6 Low Voltage Power Supply 111 3 . . . SECTION IV MAINTENANCE 4 - 1 4 - 2 4 - 3 4 - 4 4 - 5 4 - 6 4 - 7 4 - a 4 - 9 4 . 10 4 . 11 4 . 12 4 . 13 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV . 1 IV . 2 IV . 5 IV . 5

20、 Front Panel Operational Check . . . . . . . . . . . . . . . . . . . Removing the Cabinet . Tube Replacement. . Trouble-Shooting Procedure . IV . 7 Condensed Test and Adjustment Procedure . . . . . . . . . . . . IV . 9 Complete Adjustment Procedure . . . . . . . . . . . . . . . . . . IV . 11 Turn On

21、 Procedure . IV . 11 Power Supplies . IV . 11 Trigger Generator . IV . 12 Vertical Amplifier . IV . 13 Horizontal Amplifier Adjustments . . . . . . . . . . . . . . . . . IV . 15 Sweep Generator . IV . 15 SECTION V TABLEOFREPLACEABLEPARTS 5 . 1 Table of Replaceable Parts . V . 1 I I I I I I I I I I I

22、 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 CATHODE RAY TUBE WARRANTY The cathode ray tube supplied in your Hewlett-Packard Oscilloscope and replacement cathode ray tubes purchased from , are guaranteed against electrical failure for one year from the date of sale by the Hewlett-PackardComp

23、any. Broken tubes or tubes with burned phosphor are not included in this guarantee. Your local Hewlett-Packard representative maintains a stock of replacement tubes and will be glad to process your warranty claim for you. Please consult him. Whenever a tube is returned for a warranty claim, the reve

24、rse side of this sheet must be filled out in full and returned with the tube. Follow shipping instructions carefullyto insure safe ar- rival, since no credit can be allowed on broken tubes. SHIPPING INSTRUCTIONS 1) Carefully wrap the tube in 1/4 thick cotton batting or other soft padding material. 2

25、) Wrap the above in heavy kraft paper. 3) Pack in a rigid container which is at least 4 inches larger than the tube in each dimension. 4) Surround the tube withat least four inches ofpackedexcelsior or similar shockabsorbing material. Be certain that the packing is tight all around the tube. 5) Tube

26、s returned from outside the continental United States should be packed in a wooden box. 6) Ship prepaid preferably by AIR FREIGHTor RAILWAY EXPRESS. We do not recommend parcel post or air parcel post shipment. HEWLETT-PACKARD co. 275 PAGE MILL ROAD, PALO ALTO, CALIF. U.S.A. I CRT WARRANTY CLAIM FROM

27、: DATE: COMPANY: ADDRESS: Person to contact for further inform NAME : TITLE : COMPANY: ADDRESS: To process your claim quickly pl :ated below: 1) INSTRUMENT MODEL - L 2) TUBE TYPE L 3) ORIGINALTUBE r TUBE 4) YOUR PURCHASE ORDER N O 5) DATE PURCHASED ease enter the information indic SERIA: SERIA: REPL

28、ACEMEN 6) PURCHASED FROM 7) COMPLAINT: (Please describe nature of trouble) 8) OPERATING CONDITIONS: (Please describe conditions prior to and at time of failure SIGNATURE I I I I I I I I I I I I I I I I I I I I I I 9 Model 122A Sect. I Page 1 SECTION 1 GENERAL INFORMATION 1-1 GENERAL DESCRIPTION 1-3

29、POWER LINE VOLTAGES The Model 122A is a dc to 200 kc dual-trace cathode-ray oscilloscope. It has accurately cali- brated input sensitivity and sweep-speed ranges. This oscilloscope features dc-coupled differential amplifiers and dual-trace operation. Differential amplifiers are useful since they rej

30、ect the common-mode (in-phase) part of the input while amplifying the differential (out-of-phase) part. For instance, they will reject hum pick-up while am- plifying the desired signal. In addition, using dif- ferential amplifiers has other advantages. Nor- mally dc amplifiers are difficult to keep

31、stable. Changes such as aging and changes of potentials cause this drift. However, these changes are of the common-mode type and are rejected by dif- ferential amplifiers. Thus differential amplifiers are also used to stabilize dc amplifiers. This instrument is designed to operate from a nom- inal 1

32、15 or 230 volt source. The instrument will operate satisfactorily over a *lo% variation from the nominal value, i.e. 103-127 volts. Operationat 130/260 volts will damage the instrument. If ab- normally high line voltage is suspected monitor the line voltage to be certain it does not exceed 127 volts

33、. 1-4 CONVERSION FOR 230 VOLT OPERATION The instrument can be converted from 115 v to 230 v operation by reconnecting the power trans- former dual primary windings as follows: Remove the instrument from the cabinet by removing the two large screws from the rear of the cabinet. Push the instrument fr

34、om the cabinet by pushing on the rear of the chassis. Dual-trace operation is obtained with an electronic switch. This permits observation of two signals at the same time. The two signals may be viewed either alternately during consecutive sweeps or chopped on each sweep. Chopped operation involves

35、switching rapidly between the two signals so that both appear to be traced simultaneously. The most useful type of presentation in each case will depend upon the frequencies involved. Generally, chopped operation is used with low frequency signals. These signals may also be viewed separately or with

36、 their difference (B-A) displayed on the screen. Locate the power supply terminal strip situated next to the power transformer. The twoouter ter- minals on each side are jumpered together connect- ing the windings in parallel. Remove these jumpers. Connect an insulated jumper between the second and

37、fourth terminals, connecting the windings in series. Refer to the Low Voltage Power Supply Schematic for details. Replace the 2.0 amp slow- blow fuse with a 1.0 amp slow-blow fuse. 1-5 ACCESSORIES AVAILABLE An AC-83 Viewing Hood is available at extra cost. This is a face-fitting moulded rubber hood

38、used to shade the face of the cathode-ray tube under high 1-2 DAMAGE IN TRANSIT Refer to the warranty page in this manual if any damage is apparent upon receipt. ambient light conditions. It will permit the useof lower beam intensity setting. Model 122A Sect. 11 Page 0 e c Y VI I I I I I I I I I I c

39、 I I I II E c C 2 Y 122A Sect. I1 Page 1 SECTION II OPERATING INSTRUCTIONS ONTROLS AND TERMINALS C. Other Types of Input 2-1 briefly shows how to operate the in- nt. Additional detailed information is given VERTICAL AMPLIFIER INPUT :ONSIDERATIONS exceed the common-signal voltage limit my conditions.

40、 This limit is *3 volts on the rid. Note that this is the sum of all volt- c plus peak ac). - he attenuators are used the voltage to the brminals may be increased by the amount of the attenuation as follows: TABLE 2-1 P Attenuator Setting Common-Signal Limi 0.01 VOLTS/CM 0.1 1 .o 10 *3 volts 30 300

41、500 NOTE Maximum peak input voltage limit is 600 volts (dc plus peak ac). The following are rec- ommended ways of connecting the oscilloscope. Re- fer to Figures 2-1 to 2-4 for further details con- cerning connections. Other types of input are possible. For example, balanced input with either dual o

42、r single channel operation is possible (see Figure 2-4). However, as with most other types of input, the limitation that it may only be used on the .01 VOLTS/CM ranges must be observed. Thus the common- signal limit is *3 volts. This limitation is necessary since there is an attenuator only between

43、the upper red input terminal and the input grid. The lower red terminal does not have an attenuator between it and its input grid. Therefore balanced input with attenuation is not possible using only a single channel without external attenuators. However, this may be accomplished using both channels

44、 (see paragraph B above and Figure 2-3). 2-3 CHECKING HORIZONTAL AMPLIFIER GAIN CALIBRATION The horizontal amplifier may be calibrated by com- paring it with the vertical amplifier. First, cali- brate the vertical amplifier as shown in Figure 2-10. Set both VERT. and HORIZ. SENSITIVITY switches to 0

45、.1 VOLTS/CM with VERNIERS in Cal. Feed an external 1 volt signal into the verticaland hori- zontal input terminals. Adjust the input amplitude for a 10 cm high pattern. Set Horiz. Gain Adj., R114, for exactly 10 cm of horizontal deflection. A. Unbalanced Input (see Figure 2-2) Maximum voltage limit

46、as in table 2-1. B. Differential (B-A) Input (see Figure 2-3) Basic operating procedures are shown in the illus- Maximum voltage limit from each line to ground trations that follow. Directions are given for the as in table 2-1. Common-signal rejection is at cabinet model but are the same for the rac

47、k mount least 40 db with both switches set on 10 MILLI- model. The location of the controls on the front VOLTS/CM. Rejection is at least 30 db on other panel is different in the rack mount model but the ranges, functions of the controls are the same. 2-4 OPERATING DRAWINGS Sect. I1 Page 2 Model 122A UNBALANCED INPUT m i m A VERT SENSITIVITY I 1. Connect input to red terminals with ground to lower terminal. Follow same procedure for other channel. Figure 2-2 3 CHANNELA POLARITY pos UP NE6 up c i P E J YODEL 0 SCI L :1 122A Sect. I1 Page 3 BALANCED INP