KEI 193A Instructions 电路图.pdf

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1、Instruction Manual Model 193A System DMM 01985, Keithley Instruments, Inc. Instrument Division Cleveland, Ohio, U.S.A. Document Number 193A-901-01 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 SAFETY PRECAUTIONS The following safety precautions should be observed before operating the Model 193A Th

2、is instrument is intended for use by qualified personnel who recognize shock huxds .nd are i,lmiliar with the safety precautions required to avoid possible injury. Read WET the manual carefully before operating this instrument. Exercise extreme caution when a shock hazard is present at the instrumen

3、ts input. The American National Standards Institute (ANSI) states that a shock hazards exists when voltage levels greater than 3OV rms or 42.4V peak are present. A good safety practice is to expect that a hazardous voltage is present in any unknown circuit before measuring. Ins .R ect the test leads

4、 for possible wear, cracks or breaks before each use. If any defects are found, replxe wt test leads that have the same measure of safety as those supplied with the instrument. For optimum safety do not touch the test leads or the instrument while power is applied to the circuit under test. Turn the

5、 power off and discharge all capacitors, before connecting or disconnecting the instrunwnt. Always disconnect all unused test leads from the instrument. Do not touch any object which could provide a current path to the common side of the circuit under lest or power line (earth) ground. Always make m

6、easurements with dry hands while standing on 1 dry, ill- s (0.2x) for 50kHz to 100kHr. Typical 200mv 100 pv 2+3 2 ImV 2+3 20 v 1OmV 2+3 200 v 100mV 2+3 700 v 1 v 2+3 OHMS ACCURACY (5% Digits)* MAXIMUM CURRENT -t (%rdg + counts) READING RESOLUTION THROUGH 24 Hr., 90 Days, 1 Yr., RANGE (5% Digits) 6%

7、5,2 UNKNOWN 230 * 1C 23 i ST 230 i5T 200 n 219.999 n 100 po lmfl ImA 0.0035+2* 0.007+2* 0.010+2* 2 kO 2.19999 k!I ImIl 1Omfl ImA 0.0035+2 0.007+2 0.010+2 20 kn 21.YYYY k0 Nllll 1oomn 100 0.28V on 200mA range; 1V on 2A range. 2mA 10nA 0.09+10 0.01+0.5 20mA lOOnA 0.091-10 0.01+0.5 200mA lA 0.09+10 0.0

8、1+0.5 2 A lo+4 o.o9+1O 0.01+0.5 TRMS AC AMPS (Options 1930 and 1931) ACCURACY* 45Hz to 1OkHz (5% Digits) TEMPERATURE RESO- (1 Year) COEFFICIENT LUTION +(%rdg+counts) -t(%rdg+counts)/“C RANGE (5% Digits) 180-28C 0”-18”C 0.28V on 200mA range; 1V on 2A range. OVERLOAD PROTECTION: 2A fuse (25OV), extern

9、ally accessible. SETTLING TIME: 0.5s to within 0.1% of change in reading. dB (Ref. = ImA): ACCURACY + dB 1 Year, 18O-28C INPUT 45Hz-10kHz RESOLUTION -34 to +66dB 20pA to 2A -54 to -34dB 2pA t” 20/I 0.3 O.OldB 2 O.OldU TEMPERATURE (Thermocouple) (over IEEE Blrs only) THERMO- ACCURACY= COUPLE (1 Year)

10、 TYPE RANGE RESOLUTION 113-28”C J -100 to + 760C O.l”C 10.5”C K -100 t” +1372”C O.l”C +0.5”C T -100 to + 400C O.l”C +0.5oc E - 100 to + 1000C O.l”C kO.h”C R 0 to +1768”C 1 “C *3 “C s 0 to c176PC 1 “C *3 “C B c350 t” +1821”C 1 “C 1-5 “C Relative to external 0C reference junction; exclusive of ther- m

11、ocouple errors. Junction temperature may be external. TEMPERATURE (RTD) 4-WIRE RESO- ACCURACY* TEMPERATURE RANGE LUTION 1 Yr., 18-2oC COEFFICIENT 1000 to O.OlC *o.lt?c * (0.0013% + +63O”C O.O05C)/C 148O to O.Ol”F 10.36OF *(0.0013%+ +llOO”F 0.01 F)PC *Excluding probe errors. RTD TYPE: 1000 platinum;

12、DIN 43 760 or IPTS-68, alpha 0.00385 or 0.00392, 4.wire. MAXIMUM LEAD RESISTANCE (each lead): 4.wire, 10R. SENSOR CURRENT: 1mA COMMON MODE REJECTION: Less than 0.005”CIV at dc, 50Hz and 60Hz (lOOn unbalance, LO driven). MAXIMUM ALLOWABLE INPUT: 350V peak, 250V *Ins. IEEE-488 BUS IMPLEMENTATION Multi

13、line Commands: DCL, LLO, SDC, GET, GTL, UNT, UNL, SIE, SID. Uniline Commands: IFC, REN, EOI, SRQ, ATN. Interface Functions: SHl, AHl, TEO, LA, LEO, SRl, RLZ, PPO, DCl, DTl, CO, El. Irogrammable Parameters: Range, Function, Zero, Inte- gration Period, Filter, dB Reference, EOI, Trigger, Ter- minator,

14、 Delay, 500-rd P Storage, Scaling, Calibration, Display, Multiplex Of, Status, Service Request, Self Test, Output Format. GENERAL DISPLAY: 14, 0.5.in. alphanumeric LED digits vith decimal point and polarity. Function and IEEE bus status also displayed. RANGING: Manual or fast autoranging. ISOLATION:

15、 Input LO to IEEE LO or power line ground: 500V max., 5xlOSV.Hz; greater than 10% paralleled by 400pF. DATA MEMORY: I to 500 locations, progrumwble, Measurement intervals selectablr lms to 999.999x-c or triggered. BENCH READING RATE: 5 readingswr, vwpt 2OlIl; ZOOMR range 2 rcadingsisec. ZERO: Contro

16、l subtracts on-scale value from subsequent readings or allows value to bc programmed. FILTER: Weighted average (exponential). Programmable weighting: 1 to linearly derate 3% RH/“C, 35C to 50C (except 2OOMII range: 0% TV, M1”, RH up to 28C). STORAGE ENVIRONMENT: -25 to +65-C. POWER: 105.725V or 210.2

17、50V (internal switch selected), 50Hz or 6OHz, 40VA maximum 90.IItlV Resistance Calibration . 6-10 TRMS AC Volts (Model 1930) Calibration . 6-13 DC Current Cahbratmn . 6-14 TRMS AC Current Calibration . 6-15 Static-Sensltwe Devzes . 6.21 Recommended Troubleshooting Mode . Model 193A Troubleshooting M

18、ode . 6;: Power Supply Checks . h-28 Factory Default Conditions . 2-l Front PanelPrograms . 2-4 Error and Warning Messages . 2-9 Internal Filter . 2.12 Resistance Ranges . 2.15 Corresponding Voltage Reference Levels for Impedance References . 2.19 Comparison of Average and TRMS Meter Readings. . 2-2

19、1 High Speed Data Store . 2.22 Example MX + B Readings . Z-28 . . . . . . . . . . . vii 6.14 Digital Circuitry Checks . 6-28 6-15 Display Circuitry Checks . 6-29 7-l Display Board, Parts List . 7-2 Digital Board, Parts List . 7-3 Analog Board, Parts List, . 7-4 Model 1930, Parts List . 7-5 Model 193

20、1, Parts List. . 7-6 Model 193A Mechanical Parts List . . 7-2 . 7-7 715 7-31 7-37 7-41 vttt SECTION 1 GENERAL INFORMATION 1.1 INTRODUCTION The Keithley Model 193A System DMM, with the TRMS AC Volt and Current options installed, is a six function auto- ranging digital multimeter. At 6% digit resoluti

21、on, the LED display can display 2,200,OOO counts. The range of this analog-to-digital (A/D) converter is greater than the nor- mal *1,999,999 count AID converter used in many 6% digit DMMs. The built-in IEEE-488 interface makes the instru- ment fully programmable over the IEEE-488 bus. With the TRMS

22、 ACV option and the Current option installed, the Model 193A can make the following basic measurements: 1. DC voltage measurements from 1OOnV to lOOOV. 2. Resistance measurements from 1OOpfl to ZOOMR. 3. RTD temperature measurements from -1OOOC to 63OC. 4. TRMS AC voltage measurements from I$/ to 70

23、0V. 5. DC current measurements from 1nA to 2A. 6. TRMS AC current measurements from 1nA to 2A. In addition to the above mentioned measurement capa- bilities, the Model 193A can make dB and TRMS AC + DC measurements. 1.2 FEATURES Some important Model 193A features include: l 14 Character Alphanumeric

24、 Display-Easy to read 14 seg- ment LEDs used for readings and front panel messages. l High Speed Measurement Rate-1000 readings per second. l Zero-Used to cancel offsets or establish baselines. A zero value can be rogrammed from the front panel or over the IEEE-488 B = +5. Table 2-9. Example MX + B

25、Readings 1. Set up the instrument as desired or run Program RESET (see paragraph 2.8.7) to return the instrument to the fac- tory default conditions. 2. Press the PRGM button. The following prompt will be 193A Range and Function MX + B* Reading 0) 1 displayed: PROGRAM ? 2WDC 20VDC 2WAC 20kQ 8.OOOOOV

26、DC -5.OOOOOVDC 6.3OOOOVAC “Where M = +1.5 and B = +5. 2.8.9 Program 90 (Save) 17.0000WDC -2.5000WDC 14.45OOWAC ll.OOOOOk0 3. Enter the number 90 by pressin the “9” and “0” but- tons. The following message WI 1 be dlsplayed briefly: ,B PROGRAM SAVE 4. The following message will then be displayed: PRE

27、SS ENTER 5. To save the instrument setup conditions, press the ENTER button. The following message will be displayed Program 90 saves current instrument conditions set up by the user. These user programmed conditions will then replace the previously saved default conditions on ower- up. Also, an SDC

28、 or DCL asserted over the IEEE- B 88 bus will return the instrument to these saved conditions. briefly: ENTERED 6. The instrument will return to the conditions set up in step 1 and will now power-up to those conditions. One function (including dB, AC+DC or low frequency AC+DC) may be saved along wit

29、h the following para- meters: Range Resolution Zero status (on/off) and value Filter status (on/off) and value On the other functions, filter and zero values are the only parameters that are be saved. Notes: 1. To exit the program without changing the previous default conditions, press any front pan

30、el button except the ENTER button. The instrument will return to the operating states set up in step 1. 2. To return the instrument to the factory power-up default conditions, use Program Reset (see paragraph 2.8.7) and save the conditions using Program 90. 3. When using this program, make sure that

31、 the rest of the instrument is in the desired operating state. 2-28 OPERATION 2.8.10 Program 91 (IEEE Address) Program 91 allows the user to check and/or modify the ad- dress of the IEEE-488 interface. The interface can be set to any rimary address from 0 to 30. Detailed information on the EEE-488 b

32、us is provided in Section 3. Perform the P following steps to use this program: :I. Press the PRGM button. The following prompt will be displayed: PROGRAM ? 2. Enter the number 91 by pressing the “9” and “I” but- tons. The IEEE address value will be displayed. Exam- ple: If the current primary addre

33、ss of the instrument is 10, the following message will be displayed: IEEE=10 3. If it is desired to retain the displayed status value, pro- ceed to step 4. To change the status value, enter the ad- dress number (0 to 30) as explained in paragraph 2.8.1. 4. With a valid status value displayed, press

34、the ENTER but- ton, the following message will be displayed briefly and the instrument will return to the previously defined state. ENTERED Notes: 1. If an in each pulse will occur after mechanical switch may be used. Note, however, that de- the Model 193A has completed a conversion. bouncing circui

35、try will probably be required to avoid im- proper triggering. 4. I* a one-shot trigger mode, the Model lY3A will output a pulse once each time it is triggered. 2-31 OPERATION Figure 2-10. Voltmeter Complete Pulse Specifications 2.10.3 Triggering Example As an example of using both the external trigg

36、er input and the meter complete output, assume that the Model 193A is to be used in conjunction with a Keithley Model 705 Scan- ner to allow the Model 193A to measure a number of dif- ferent signals, which are to switched by the scanner. The Model 705 can switch up to 20 Z-pole channels (20 single-

37、pole channels with special cards such as the low-current card). In this manner, a single Model 193A could monitor up to 20 measurement points. By connecting the triggering inputs of the two instruments together, a complete automatic measurement sequence could be performed. Data obtained from each me

38、asurement point could be stored using the data store mode of the Model 193A. Once the Model 705 is programmed for its scan sequence, the measurement procedure is set to begin. When the Model 705 closes the selected channel, it triggers the Model 705 to scan to the next channel. The process repeats u

39、ntil all channels have been scanned. To use the Model 193A with the Model 705, proceed as follows: 1. Connect the Model 193A to the Model 705 as shown in Figure 2-11. Use shielded cables with BNC connectors. The Model 193A VOLTMETER COMPLETE OUTPUT jack should be connected to the Model 705 EXTERNAL

40、TRIGGER INPUT jack. The Model 193A EXTERNAL TRIGGER INPUT jack should be connected to the Model 705 CHANNEL READY OUTPUT. Additional connec- tions, which are not shown on the diagram, will also be necessary to a as well as for t 1, ply signal inputs to the scanner cards, e signal lmes between the sc

41、anner and the Model 193A. 2. Place the Model 193A in the one-shot trigger mode as explained in paragraph 2.9. 3. Program the Model 705 scan last channel as required. P ammeters such as first and P ace the instrument in the single scan mode. 4. Install the desired scanner cards andmake the required i

42、nput and output signal connections. See the Model 705 Instruction Manual for details. 5. Begin the measurement sequence by pressing the Model 705 STAIiriSTOP button. The Model 705 will close the first channel and trigger the Model 193A to take a reading. When the Model 193A completes the reading, it

43、 will trigger the Model 705 to go to the next channel. The process repeats until all programmed channels have been scanned. 2-32 OPERATION -1 I I I J 1 Figure 2-11. External Triggering Example 2-3312-34 SECTION 3 IEEE-488 PROGRAMMING 3.1 INTRODUCTION The IEEE-468 bus is an instrumentation data bus w

44、ith hard- ware and progra mming standards originally adopted by the IEEE (Institute of Electrical and Electronic Engineers) in 1975 and given the IEEE488 designation. In 1978, standards were upgraded into the IEEE488-1978 standards. The Model 193A conforms to these standards. This section contains general bus information as well as the nec