KEI 197 INST 电路图.pdf

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1、Instruction Manual Model 197 Autoranging Microvolt DMM 0 Keit hley Instruments, Inc. Cleveland, Ohio, U.S.A. Document Number 197-901-01 RadioFans.CN 收音机爱 好者资料库 DC VOLTS ACCURACY * *(%rdg+counts) RANGE LUTION RESISTANCE 22-24C 18-28C 200mV 1 rV iGR 0.007+2 0.016+3 20 V 100 pV iiMR 0 m6+2 0.015+2 200

2、V ImV 1OMR 0.006+2 0.015+2 loo0 v 1 OmV 1OMR 0.007+2 0.015+2 RESO- INPUT 24 Hr.,* 1 Yr., - 2 V 10 pV 1GR 0 005+2 0.011+2 *Relative to calibration accuracy. NMRR: Greater than 6OdB at 50Hz. 60Hz *0.1%. MAXIMUM ALLOWABLE INPUT: lO00V dc or peak ac (less than 10 seconds per SETTLING TIME 1 second to wi

3、thin 3 counts of final reading on range. dB MODE (ref: ma): Accuracy: 300V rms continuous). 0.OldB above 0.5% of range TRMS OLTsACCURACY (1 Yr.) 18-28C *(%rdg+counts) 2OHz- 50Hz- lOkHz - 20kHz - 50kHz- RANGE 50Hz* 1OkHz 20kHz 50kHz* 100kHz 200mV 1.00+100 0.35+100 0.6+200 1.5+250 5+400 2V - 200V 1.00

4、+700 0.35+100 0.6+200 1.5+250 3+400 750V 1.25+100 0.75+100 1.0+200 1.8+250 3+400 Above 1800 counts. MAXIMUM ALLOWABLE INPUT: 750V rms, IOOOV peak (less than 10 seconds per 3dB BANDWIDTH: 3JOkHr typical. INPUT IMPEDANCE: 1MR paralleled by less than 75pF on 200V and 750V ranges. 1.1MR paralleled by 75

5、pF on 200mV, 2V and 2OV ranges. Capacitively coupled. SETTLING TIME: 1 second to within 0.1 % of final reading on range. dB MODE (ref: 600R): *Above 18000 counts. minute on 200mV and 2V ranges, 300V rms continuous). lOV*Hr maximum. ACCURACY ( +-dBm) 20Hz- 10kHz- 20kHz- 5OkHz- RANGE INPUT lOkHz 20kHz

6、 50kHz 100kHz 2V - 750V 200mV to 750 V 0.18 0.18 0.28 0.50 ( - 12 to 59.8dBmj (-32 tn -12dBmj (-52 to -32dBm) (-58 to -52dBm) 200mV 20mV to 200mV 0.18 0.18 0.28 0.65 2mV to 20mV 0.85 1.10 2.00 1mVto 2mV 2.00 3.00 - - RESOLUTION: 0.OldB above 0.5% of range. DC AMPS MAXIMUM ACCURACY (1 Yr.) VOLTAGE 18

7、-28C RANGE RESOLUTION BURDEN *(%rdg+counts) 200 uA 1 nA 0.3V 0.1 +15* 2mA lOnA 0.3V 0.1 +I5 200mA 1 PA 0.3V 0.2 +I5 20mA 100nA 0.3V 0.1 +I5 2000mA 10 pA 0.8V 0.2 +I5 10 A 100 pA 0.3V 0.75+15 Above 5A derate 0.15% rdg per amp for self-heating. *When properly rereod. OVERLOAD PROTECTION: mA Input: 2A

8、fuse (250V), externally accessible. SETTLING TIME: 1 second to within 3 count5 of final reading. 10A Input: 20A for 15s. unfused. TRMS AC AMPS ACCURACY (1 Yr.)* MAXIMUM 18-28c +(%rdg+counts) VOLTAGE RANGE BURDEN ZOHz - 50Hz 50Hz - lOkHz 10kHz - 30kHz 200pA - 20mA 0.3V 1.0+100 0.8+100 2 + 250 200mA 0

9、.3V l.O+IOO 08+100 - 2ooOmA 0.8V 1 OflW 08+100 - 10 A 0.3V 1.5+100* 1.0+100* - *Above 1800 counts. 1kHz max. Above 5A derate 0.15% rdglamp for self-heating. SETTLING TIME: 1 second to within 0.1% of final reading. Specifications subject to change without notice ACCURACY OHMS OUTPUT MAX v ?(%rdg+coun

10、ts) RESO- NOMINAL ACROSS 24 HI. 1 Yr. RANGE LUTION I-SHORT UNKNOWN 22 -24C 18 -28C 200 n 1mR 2mA 05V 001 +2 002 +3 2 kR* 1OmR 2mA 4.0 V 0.01 + 2 0 018+2 20 kQ lOOmR 400pA 4.0V 0.014+2 0.026+2 200 kR* 1 R 40pA 4.0V 0.014+2 0.026+2 2MR 10 n 4 aA 4.0V 0.02 +2 0.035+2 20MR 100 R 400nA 4.0V 0.10 +2 0.12

11、+2 200MR* 10 kR 400 nA 5.0V 2.00 +1 2.00 +1 When properly zeroed. CONFIGURATION: Automatic 2- or 4-terminal. MAXIMUM ALLOWABLE INPUT: 450V dc or peak ac 10 seconds per minute. 350V OPEN-CIRCUIT VOLTAGE: +5V. DIODE TEST: Display reads junction voltage up to 2.2V Test Current: 1.6mA SETTLING TIME: 2 s

12、econds to within 3 counts of final reading on range. *Appropriate range selected automatically in MR. rms continuous. nominal. GENERAL DISPLAY: *220,oo0 count LCD. 0.45 in. height; polarity, function, range. and status indication. RANGING: Auto or manual on dc volts, ac volts, and ohms: manual on ac

13、 amps and dc amps RELATIVE: Iushbutton allows zeroing of on range readings. Allows readings to be made with respect to baseline value Front panel annunciator indicates REL mode. DATA LOGGER and MIN/MAX: 100 reading storage capacity: records data at one of six selectable rates from 3 readingslsecond

14、to 1 reading;hour or by manual trigger- ing. Also detects and stores maximum and minimum readings continuously while in data logger mode. CONVERSION RATE: 3 readings/second. OVERRANGE INDICATION: OL displayed. CREST FACTOR (ratio of peak value to rms value), AC FUNCTIONS: 3. MAXIMUM COMMON MODE VOLT

15、AGE: 500V peak COMMON MODE REJECTION RATIO (1kR unbalance): Greater than 12OdB at dc, SOHr, 6OHz +0.1%. Greater than 6OdB in ac volts. TEMPERATURE COEFFICIENT (Oo-lS0C less than 80% relative humidity up to 35C: linearily derate 3% RH/C, 35-50c. Storage: -25 to 60-C. WARMUP: 1 hour to rated accuracy.

16、 POWER: 105-125V or 210-25OV (external switch selected). 90-llOV available; DIMENSIONS, WEIGHT: 89mm high X 235mm wide X 275mm deep (31 2 in. X 91 4 ACCESSORIES SUPPLIED: Model 1751 safety te5t leads, instruction manual. ACCESSORIES AVAILABLE: 50-60Hz, 12V.A. Optional 5-hour battery pack, Model 1978

17、. in. X 10% in.). Net weight 1.8kg (3 Ibs., 14 OL 1. Model 1010: Model 1017: Model 1301: Temperature Probe Model 1600A. High Voltage Probe Model 1641 : Model 1651: 50-Ampere Current Shunt Model 1681: Model 1682A: RF Probe Model 1684: Model 1685: Clamp-On Ac Probe Model 1751: Safety Test Leads Model

18、1754: Model 1972: Model 1973: IEEE-488 Interface Model 1978: Rechargeable Battery Pack Model 7008-3: IEEE-488 Digital Cable (3 f t ) Model 7008-6: IEEE-488 Digital Cable (6 it.) Model 8573. Single Rack Mounting Kit Dual Rack Mounting Kit Kelvin Test Lead Set Clip-On Test Lead Set Hard Shell Carrying

19、 Case Universal Test Lead Kit IEEE-488 with Analog Output IEEE-488 Interface for IBM I T (use with 1972l3) RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS SECTION 1-GENERAL INFORMATION 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 2.1 2.2 2.3 2.3.1 2.3.2 2.3.3 2.4 2.4.1 2.4.2 2.4.3 2.4.4 2.5 2.6 2.6.1 2.6.2 2.

20、6.3 2.7 2.7.1 2.7.2 2.7.3 2.7.4 2.7.5 2.7.6 2.7.7 2.7.8 2.7.9 2.7.10 2.7.11 2.7.12 2.8 2.8.1 2.8.2 2.8.3 2.8.4 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Features . . . . . . . . . . . . . . . . .

21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Warranty Information 1-1 ManualAddenda . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Safety Symbols and Terms. . . . . . . . . . . . . . . . . . . . . . . . . . .

22、. . . . . . . . . . . . . . . . . . . . . 1-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

23、. . . . . . . . . . 1-2 Using the Model 197 Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24、 . . . 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessories . . . . . . . . . . . . . . . . . . . . . . SECTION 2-BENCH OPERATION Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25、. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 High Energy Circuit Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Preparation For Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26、 . . . . . . . . 2-1 LinePower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 BatteryPackPower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Battery Ch

27、arging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Front Panel Familiarization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Input Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

29、 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Current Fuse Replace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 ErrorMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30、. . . 2-4 Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Maximum Allowable Inputs . . . . . . . . .

31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 WarmUp . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Basic Bench Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 PowerUp . . . .

32、. . . . . . . . . . . . . . . . . 2-5 Relative Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 ent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 TRMS AC Voltage Measurements . . . .

33、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Microvolt Measurement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Resistance Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34、. . . . . . . . . . . . . . . . 2-8 Current Measurements (DC or TRMS AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 AC Plus DC Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 dB Measurements

35、. . . . . . . . . . . . . . dB Measurements Considerations and Applicatio MIN/MAX and 100 Point Data Logger Operatio Diode Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36、. . . . . . . . . TRMS Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 AC Voltage Offset . . . . . . . . . . . . . . . . . . . . . . 2-14 TRMS Measurement Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37、. . . . . . . . . . . . . . . . 2-14 CrestFactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 Extended Frequency Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 i Rad

38、ioFans.CN 收音机爱 好者资料库 SECTION 3- PERFORMANCE VERIFICATION 3.1 3.2 3.3 3.4 3.5 3.5.1 3.5.2 3.5.3 3.5.4 3.5.5 4.1 4.2 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.4 4.4.1 4.4.2 4.4.3 4.4.4 4.5 4.6 4.7 5.1 5.2 5.3 5.4 5.5 5.5.1 5.5.2 5.6 5.6.1 5.6.2 5.6.3 5.6.4 5.6.5 5.6.6 5.6.7 5.6.8 5.7 5.7.1 5.7.2 5.7.3

39、 - _ _ _ . . . 3-1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Environment itions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Recommended Test Equipment . . . .

40、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Initial Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Verification Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41、. . . . . . . . . . . . . . . . . . . . . 3-1 DC Voltage Accuracy Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 AC Voltage Accuracy Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Resistance Accurac

42、y Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 DC Current Accuracy Check . . . . . . . . . . . AC Current Accuracy Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 . . . . . . . . .

43、. . . . . . . . . . . . . . . . . . . . . . SECTION 4-THEORY OF OPERATION Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Overall Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . .

44、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Analog Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Multiplexer . . . . . . . . . . . . . . . . 4-1 Input Buffer Amplifier . . . . . . . . . . .

45、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

46、 . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 AC Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

47、. . . . . . 4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 PIA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Display Board . . . . . . . . . . . . .

48、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Model 1978 Battery Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49、. . . . . . . . . . . . . . . . 4-7 SECTION 5-MAINTENANCE Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Top Cover Removal/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 . . . . 5-2 Battery Pack (Model 1978) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Line Voltag