KEI28262C(Model172,173) 电路图.pdf

《KEI28262C(Model172,173) 电路图.pdf》由会员分享，可在线阅读，更多相关《KEI28262C(Model172,173) 电路图.pdf（151页珍藏版）》请在收音机爱好者资料库上搜索。

1、Models 172,173 Instruction Manual Contains Operating and Servicing/Calibration Information for Models 172,173,1722, and 1728 Publication Date: October, 1977 Keithley Instruments, Inc. Instrument Division Cleveland, Ohio, U.S.A. Document Number: 28262 RadioFans.CN 收音机爱 好者资料库 INSTRUCTION MANUAL Dlglta

2、t Multlmeter Models 172,173 Contalnr Operating and SafuWno/bmtlon In!omuNon For Moddr 172,173,1722, and 1728.1 1 KEITHLEY INSTRUMENTS m RadioFans.CN 收音机爱 好者资料库 INSTRUCTION MANUAL Digital Multimeter Models 172, 173 COPYRIGHT 1976, KEITHLEY INSTRUMENTS, INC. THIRD PRINTING, OCT. 1977, CLEVELAND, OHIO

3、U.S.A. DOCUMENT NO. 28262, REVISION CODE CC RadioFans.CN 收音机爱 好者资料库 INSTRUCTION MANUAL Dlgltal hlultlmeler Models 172,173 CONTENTS I Section Page CONTENTS ILLUSTRATIONS. . : : : : : : : : : : : : : : : : : : : : : : . ii iii SPECIFICATIONS . I. GENERAL INFORMATION. . : : : : : : : : : : : : : : : :

4、: : : : : : I-I I l-l. INTRODUCTION . . . . . . . . . . . . . . . . . . . . l-2. FEATURES . . . . . . . . . l-3. QARRANTY INFORMATION . . . : : : : : : : : : : : : : I 1-4. CHANGE NOTICE. . . . . . . . . l-5. OPTIONAL MODEL 1728 RECHARGEABL; ;A;T;R; PACK: : : : l-6. OPTIONAL MODEL 1722 DIGITAL INTER

5、FACE. . . . . . . . I , 4. I I: 5. I i I OPERATING INSTRUCTIONS . 3-l. GENERAL . 3-2. HOW TO SELECT POWER. . ;I;. HOW TO SELECT FUNCTION HOW TO SELECT RANGE. . . HOW TO MEASURE VOLTAGE . HOW TO MEASURE CURRENT (MODEL 172 ONLY): : : : : : : : HOW TO MEASURE CURRENT (MODEL 173 ONLY). HOW TO MEASURE RE

6、SISTANCE. . . . : : : : : : : FURTHER MEASUREMENT CONSIDERATIONS ;I?;. HOW TO USE MODEL 172/173 OFF-GROUND: : : : : : : : : : 3-11. HOW TO USE OPTIONAL PROBES AND SHUNTS. . 3-12. HOW TO USE THE MODEL 1722 DIGITAL INTERFACE. . ACCESSORIES . 4-l. GENERAL.: : POWER OPTIONS. . ISOLATED DIGITAL OUTPUT. .

7、 4-4. RACK MOUNTING. . : : : : : : : 4-5. PROBE AND SHUNTS . 4-6. CABLES AND CONNECTORS. . 4-7. MISCELLANEOUS. . THEORY OF OPERATION. . 5-l. GENERAL . INPUT SIGNAL CONDITIONING. . POWER SUPPLY, SCHEMATIC NO. 28067D . DISPLAY BOARD PC-403 SCHEMATIC NO. 274780. . CURRENT BOARD, SCHEMATIC NO. 27478D. .

8、 MODEL 1728 RECHARGEABLE BATTERY PACK . ANALOG-TO-DIGITAL CONVERTER. . MODEL 1722 DIGITAL INTERFACE . 5-9. DETAILED II-WIRE OHMS OPERATION . : : : : : : : : : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . * . . . . * . . . . . . . . . . . . .

9、 . . . . . . . . . . . . I-l . l-1 l-l . l-l 1-I . 1-l . 2-l . 2-l . 2-l 2-l . . . . 3-l . . . , 3-l . . . 3-l . . 3-2 . . . 3-3 . . 3-4 . . . . 3-5 . . . . 3-6 . . . . 3-7 . . . . 3-8 . . . 3-11 . . . . 3-12 . . 3-13 . . . . 4-l . * . . 4- 1 . . . . 4-l . . . . 4-l . * . . 4-l * . . . 4-4 . . . . 4

10、-5 . . . . 4-5 . . . . 5-l . . . . 5-1 . . . . 5-2 . . . . 5-9 . . . . 5-10 . . . . 5-12 . . . . S-13 . . . . 5-13 . . . . 5-22 . . . . 5-26 ii AA I INSTRUCTION MANUAL Digllel Mulllmeter Model8 172. 173 I CONTENTS (continued) /section _I Page 6. MAINTENANCE. . 6-1. GENERAL. . 6-2. : : : : : : : : :

11、: : : : : : : : REQUIRED TEST EQUIPMENT. . 6-3. PERFORMANCE VERIFICATION 6-4. ADJUSTMENT/CALIBRATION PRR; : : : : : : : : : : : : : : : : : : : : 6-5. TROUBLESHOOTING AND REPAIR , . 7. REPLACEABLE PARTS. . . . . . . . . . : : : : : : : : : : : : : : : : : : : : : 7-1. GENERAL. . . 7-2. ORDERING INFO

12、RMATiON : : : : : : : : : : : : : : : : : : : : : : : : : : J-3. SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ILLUSTRATIONS - n b 6-1 6-1 6-I 6-3 6-15 / 6-19, J-1 1 ;:; j J-1 ) Title Fi ure No. g Page I Dimensional Data. . iv : Tilt Bail Positions . vi Front Panel . t-2 4 B

13、ottom View Showing Line Cord . l-3 2 Rear Panel Showing Current Fuse and Check Points. . 2-2 Model 1728 Rechargeable Battery Pack. . 2-4 z Installation of Battery Pack. . 2-5 Front Panel Pushbutton Selection. . 3-3 9 Typical Model 172 Current Display . 3-5 IO Typical Model I73 Current Display . 3-6

14、II Typical 2 WIRE Resistance Measurement . 3-J 12 Typical 4 WIRE Resistance Measurement . 3-9 13 Semiconductor Diode and Transistor Testing. . 3-10 I4 Illustration of Floating Operation. . 3-11 I5 Model 1722 Digital Output Interface . 3-14 16 Installation of Model 1722. . 3-15 17 Connector Pin Ident

15、ification. . 3-17 18 Card-Edge Connectors. . 3-17 19 Location of Jumpers and Pull-Ups on Model 1722. . 3-18 20 Model 1010 Single Rack Mounting Kit. . .4-Z 21 Model 1017 Dual Rack Mounting Kit. . : : .4-4 22 Overall Block Diagram of Model lJ2/173 . : . DC Volts Input Circuit .5-l 23 . .5-4 24 Simplif

16、ied AC Attenuator Circuit . 1 : .: : : : : : : .5-6 25 AC Converter Circuit . . 26 .5-6 Digital Display Multiplex Scheme . .5-II 27 Basic Functional Blocks of A/D Converter . 28 .5-14 . 29 Basic Charge-Balance Converter .5-15 Operating Waveforms of A/D Converter . .5-16 30 Simplified Schematic of A/

17、D Converter. . .5-18 ;: Detailed Schematic of A/D Converter. . .5-20 A/D Converter System Timing. . .5-21 ;:a. Model 1722 Block Diagram . .5-24 Simplified Ohms Diagram (Shown in Z-WIRE Configuration). . .5-25 34b. Four-Wire Ohms Measuring Technique . .5-25 I INSTRUCTION MANUAL Digltal Multimeter Mod

18、els 172, 173 12.75 (324) I DIMENSIONS IN INCHES (MM) FIGURE 1. Dimensional Data. na I INSTRUCTION MANUAL Digllal Multimeter Model, 172, 173 SPECIFICATIONS AA INSTRUCTION MANUAL Digital Mullimeler Models 172.173 r LEVEL POSITION - TILTBAIL AT FRONT HANGING POSITIOI; SHELF POSITION 45 POSITION LEVEL P

19、OSITION - TILTBAIL AT REAR FIGURE 2. Tilt Bail Positions. vi AA INSTRUCTION MANUAL Digital Multimeter Models 172. 173 GENERAL INFORMATION I SECTION I. GENERAL INFORMATION l-l. INTRODUCTION. The Models 172 and 173 Digital Multimeters are wide-range, general- purpose measuring instruments, capable of

20、measuring ac/dc voltage, ac/dc current, and resistance. l-2. FEATURES a. Automatic Ranging and Polarity b. Manual Range Selection and Range Hold C. HI and LO Otxns Capability d. Line Operation e. Optional Battery Operation, Model 1728. f. Floating Capability to ?lbOOV peak 9. Optional Isolated Digit

21、al Interface, Model 1722 l-3. WARRANTY INFORMATION. The warranty is stated on the inside front cover of the manual. If there is a need for service, contact your Keithley representative or author- ized repair facility as given in OUT catalog. l-4. CHANGE NOTICE. Improvements or changes to the instrum

22、ent not incorporated into the manual will be explained on a change notice sheet attached to the inside back cover of the manual. l-5. OPTIONAL MODEL 1728 RECHARGEABLE BATTERY PACK. The Model 1728 is an accessory batterY pack which enables either line or battery operation. The Model 1728 has built- i

23、n recharging circuitry. The Model 1728 is field-installed on the Model 172/173 chasis. l-6. OPTIONAL MODEL 1722 DIGITAL INTERFACE. The model 1722 is a field-installable digital output option. It provides isolated open-collector BCD outputs and control lines. The A IMPORTANT symbol can be found in va

24、rious places in this Instruction Manual. Carefully read the associated CAUTION statements with regard to proper use and handling of the instrument. Damage to the instrument may occur if these precautions are ignored. The t symbol can be found in various places in this Instruction Manual. This symbol

25、 indicates those areas on the instrument which are potential shock hazards. Carefully read the associated WARNING statements with regard to proper use and handling of the instrument. Serious personal injury may result if these precautions are ignored. cc l-l GENERAL INFORMATION INSTRUCTION MANUAL Di

26、gital Multimeter Models 172.173 FUNCTION AND UNITS DISPLAY (my) INPUT HI AND LO, UPPER PAlR (OHMS SOURCE. LOWER PAIR) VOLTAGE FUNCTION (OUT) AHPERES FUNCTION (IN) DC FUNCTION AUTORANG, NG (OUT) MANUAL RANGING (IN) LINE POWER (LINE AND EAT MUST BE OUT FOR BATTERY CHARGE) FIGURE 3. Model 173 Front Pan

27、el I l-2 CC INSTRUCTION MANUAL GENERAL INFORMATION Dlgllal Multlmeler Modelr 172,173 I -3 I GENERAL INFORMATION INSTRUCTION MANUAL Digllal Mullimeter Models 172.173 I 172. 173 CONDENSED OPERATING INSTRUCTIONS 1 II FUNCTION ME FU-20 for 234V. WARNING t Disconnect the line cord before removing the top

28、 cover of the instrument. Line voltage is present at various points on the circuit board and represent a SHOCK HAZARD. CAUTION A The fuse installed on the rear panel of the Model 172/173 is used only for current range protection. This fuse is not a line voltage protection fuse. - b. Battery Power. T

29、o operate the Model 172/173 from batteries, the Model 1728 Rechargeable Battery Pack must be installed. The Model 1728 can be either field or factory-installed (at the time the Model 172/173 is purchased). NOTE The Model 1728 Rechargeable Battery Pack can be installed by the user within the Model 17

30、2/173 at any time. However, if the Model 1722 Digital Output is already installed, the Model 1728 cannot be used simultaneously. 1. How to Install the Model 1728 Rechargeable Battery Pack. The batteries furnished with the Model 1728 are already installed in the battery pack. The battery pack in- clu

31、des 7 rechargeable “C” cells (l.ZV, 2 AMP Hr) and two 19.2 volt packs (sixteen l.ZV- cells per pack). See Figure 6. a) Check the fuses on the Battery Pack. Three fuses are used. All are I ampere, 3AB or 3 AG, Slo-Blo types, Keithley Part No. FU-IO. b) Check for proper installation of batteries in th

32、e Battery Pack. If replacement battery cells are to be installed, be certain to observe the proper polarity of the individual cells as shown in Figure 6. c) To install the Battery Pack, turn the instrument over so that the bottom cover faces up. Loosen four slotted screws on the bottom cover as show

33、n in Figure 4. The screws are captive, that is they cannot be removed completely. Turn over the instru- ment with the top cover facing up, taking care to hold the top and bottom covers to- gether. Carefully remove the top cover to gain access to the printed circuit board. There are 2 connections bet

34、ween the top cover and the main circuit board which must be temporarily removed in order to free the top cover. Check to see that the four insulating spacers are in position on the circuit board as shown in Figure 7. Plug the two S-wire connectors (J401, J402) into the mating receptacles (602, P606)

35、 tak- ing care to orient the connectors as shown. Place the Model 1728 in position on the spacers with the pack oriented as shown in Figure 7. Replace the connectors from the top cover to the circuit board. Replace the top cover. Turn over the instrument with the bottom cover facing up and tighten d

36、own the four slotted-head screws. I B 2-3 INITIAL PREPARATION INSTRUCTION MANUAL Digilal Mullimeler Models 172. 173 J402 a.- - . FIGURE 6. Model 1728 Rechargeable Battery Pack. INSTRUCTION MANUAL Digital Multimeter Models 172.173 INITIAL PREPARATION WARN I NG t Disconnect the line cord on the instru

37、ment before the Battery Pack is installed, Line voltage is present at various places on the circuit board and is a SHOCK HAZARD. FIGURE 7. Installation of Battery Pack. I CB 2-5 INITIAL PREPARATION INSTRUCTION MANUAL Digilal Multimeler Models 172.173 TABLE 2-2. Summary of Batteries Used in the Model

38、 1728 Description I 2V “C” ccl I (; AMP-HR) Quantity 7 Voltage 8.4v Keithley Part No. BA- 30 1 I +19.2v I BA-31 I -19.2v BA-3 I I +19.2V pack (l6-l.2V cells) -19.2V pack (16-l.2V cells) CAUTION A The Model 1728 is shipped from the factory in an uncharged condition. Therefore the pack should be insta

39、lled in the Model 172/173 and charged prior to use. 2. How to Check Batteries. a) The Model 172/173 has a built-in LO BAT indicator to permit easy determination of battery condition. The Model 172/173 also has an individual test point on the bottom panel usually needed only for troubleshooting purpo

40、ses (see Figure 4.). b) The LO BAT indicator will be lighted when the Battery Pack goes belag normal operating voltage. When the indicator turns on the Model 172/173 should be s,+jitched to LINE or OFF to permit recharging of the Pack. C) The test point may be checked at any time using the Model 172

41、/173 or other mea- suring instrument. Then voltages are summarized in Table 2-3. IMPORTANT The instrument must be operated in BAT mode in order to obtain a valid battery con- dition at test point “A”. This will ensure that the batteries are supplying power to the instrument. If the voltage is measur

42、ed when the Model 172/173 is operated in the LINE mode a different reading may be observed since the batteries are being charged. TABLE 2-3. Summary of Battery Voltage Levels (BAT mode) Test Acceptable Battery Levels Recharge Battery Point Range ) Normal if Below Tested IA” ITV + t20.5V +19.2 ITV BT

43、402 3. How to Charge the Batteries. The Model 1728 provides built-in recharging cir- cui try. The Model 172/173 must be connected to line voltage. Recharging occurs at the most rapid rate when the Model 172/173 is set to OFF. Typically, the recharge time is 2.5 hours per hour of discharge. CAUT I ON

44、 A Overcharging the batteries will raise the internal temperature of the battery pack and may shorten the life of the batteries. 2-6 CB INSTRUCTION MANUAL Digital Multimeter Models 172. 173 OPERATING INSTRUCTIONS SECTION 3. OPERATING INSTRUCTIONS 3- 1. GENERAL. This section provides information need

45、ed to operate the Model 172/173 for measurement of voltage, current and resistance. 3-2. HOW TO SELECT POWER. The Model 172/173 may be powered from line voltage or re- chargeable nickel-cadmium batteries (when the Model 1728 is installed). The Model l72/ 173 has a built-in line-voltage power supply and power cord. NOTE The accessory llodel 1726 Rechargeable Battery Pack may be ordered at the time of purchase of the Model 172/173 or may be purchased and field-installed at a later time if so desired. The Model 1728 f