KEI 2000 Quick Reference Guide 电路图.pdf

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1、 Model 2000 Multimeter Quick Reference Guide title page/TOC Page 1 Thursday, December 23, 1999 7:59 AM RadioFans.CN 收音机爱 好者资料库 Model 2000 Multimeter Quick Reference Guide 1995, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Second Printing, December 1999 Document Number: 200

2、0-903-01 Rev. B title page/TOC Page 3 Thursday, December 23, 1999 7:59 AM RadioFans.CN 收音机爱 好者资料库 Table of Contents Safety Precautions. 1 Introduction. 5 Front Panel Operation Summary. 6 Remote Operation Summary. 22 title page/TOC Page 5 Thursday, December 23, 1999 7:59 AM RadioFans.CN 收音机爱 好者资料库 1

3、Safety Precautions The following safety precautions should be observed be- fore using this product and any associated instrumenta- tion. Although some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may be present. This

4、product is intended for use by qualifi ed personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury. Read the operating information carefully before using the product. The types of product users are: Responsible body is the individual or gro

5、up responsible for the use and maintenance of equipment, for ensuring that the equipment is operated within its specifi cations and operating limits, and for ensuring that operators are adequately trained. Operators use the product for its intended function. They must be trained in electrical safety

6、 procedures and proper use of the instrument. They must be protected from elec- tric shock and contact with hazardous live circuits. Maintenance personnel perform routine procedures on the product to keep it operating, for example, setting the line voltage or replacing consumable materials. Maintena

7、nce procedures are described in the manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel. Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only properly t

8、rained service personnel may perform installa- tion and service procedures. Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or 2000-903-01A Page 1 Thursday, December 23, 1999 7:52 AM 2 test fi xtures. The American National Standards Ins

9、titute (ANSI) states that a shock hazard exists when voltage lev- els greater than 30V RMS, 42.4V peak, or 60VDC are present. A good safety practice is to expect that hazard- ous voltage is present in any unknown circuit before measuring. Users of this product must be protected from electric shock a

10、t all times. The responsible body must ensure that users are prevented access and/or insulated from every connection point. In some cases, connections must be ex- posed to potential human contact. Product users in these circumstances must be trained to protect themselves from the risk of electric sh

11、ock. If the circuit is capable of oper- ating at or above 1000 volts, no conductive part of the circuit may be exposed. As described in the International Electrotechnical Com- mission (IEC) Standard IEC 664, digital multimeter mea- suring circuits (e.g., Keithley Models 175A, 199, 2000, 2001, 2002,

12、and 2010) are Installation Category II. All other instruments signal terminals are Installation Cate- gory I and must not be connected to mains. Do not connect switching cards directly to unlimited power circuits. They are intended to be used with imped- ance limited sources. NEVER connect switching

13、 cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card. Before operating an instrument, make sure the line cord is connected to a properly grounded power receptacle. Inspect the connecting cables, test leads,

14、 and jumpers for possible wear, cracks, or breaks before each use. 2000-903-01A Page 2 Thursday, December 23, 1999 7:52 AM 3 For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the cir- cuit under test. ALWAYS remove power from the entire tes

15、t system and discharge any capacitors before: connect- ing or disconnecting cables or jumpers, installing or re- moving switching cards, or making internal changes, such as installing or removing jumpers. Do not touch any object that could provide a current path to the common side of the circuit und

16、er test or power line (earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being measured. The instrument and accessories must be used in accor- dance with its specifi cations and operating instructions or the safety o

17、f the equipment may be impaired. Do not exceed the maximum signal levels of the instru- ments and accessories, as defi ned in the specifi cations and operating information, and as shown on the instru- ment or test fi xture panels, or switching card. When fuses are used in a product, replace with sam

18、e type and rating for continued protection against fi re hazard. Chassis connections must only be used as shield connec- tions for measuring circuits, NOT as safety earth ground connections. If you are using a test fi xture, keep the lid closed while power is applied to the device under test. Safe o

19、peration requires the use of a lid interlock. If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation. The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual. The symbol on an instrume

20、nt shows that it can source or measure 1000 volts or more, including the ! 2000-903-01A Page 3 Thursday, December 23, 1999 7:52 AM 4 combined effect of normal and common mode voltages. Use standard safety precautions to avoid personal con- tact with these voltages. The WARNING heading in a manual ex

21、plains dangers that might result in personal injury or death. Always read the associated information very carefully before perform- ing the indicated procedure. The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invali- date the warranty. Instrumentati

22、on and accessories shall not be connected to humans. Before performing any maintenance, disconnect the line cord and all test cables. To maintain protection from electric shock and fi re, re- placement components in mains circuits, including the power transformer, test leads, and input jacks, must b

23、e pur- chased from Keithley Instruments. Standard fuses, with ap- plicable national safety approvals, may be used if the rating and type are the same. Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component. (Note th

24、at selected parts should be purchased only through Keithley Instruments to maintain accuracy and functional- ity of the product.) If you are unsure about the applicability of a replacement component, call a Keithley Instruments offi ce for information. To clean an instrument, use a damp cloth or mil

25、d, water based cleaner. Clean the exterior of the instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with no case or chassis (e.g., data acquisition board for installation into a computer) sh

26、ould never require cleaning if handled according to in- structions. If the board becomes contaminated and oper- ation is affected, the board should be returned to the factory for proper cleaning/servicing. 10-99 2000-903-01A Page 4 Thursday, December 23, 1999 7:52 AM 5 Introduction This quick refere

27、nce guide includes summary informa- tion on front panel and remote operation for the Model 2000 Multimeter. For detailed operating information, consult the Model 2000 Users Manual. All Keithley product names are trademarks or registered trade- marks of Keithley Instruments, Inc. Other brand and prod

28、uct names are trademarks or registered trademarks of their respective holders. 2000-903-01A Page 5 Thursday, December 23, 1999 7:52 AM 6 Front Panel Operation Summary Power-on defaults Power-on defaults are those settings the instrument assumes when it is turned on. The Model 2000 offers two choices

29、 for the settings: user or factory. With user, the instrument will power-on to the last confi guration that you saved. With factory, the instrument will power on to the factory default settings. To store a user confi guration in memory: 1. Confi gure the instrument as desired for USER default. 2. Pr

30、ess SHIFT and then SAVE. 3. Use the L and M keys to select YES or NO. Note: Select NO if you do not wish to change the last confi guration that you saved. 4. Press ENTER. To restore factory or user settings: 1. Press SHIFT and then SETUP. 2. Use the L and M keys to select FACTory or USER. 3. Press E

31、NTER. NOTE: Factory default settings are listed in Table 2. Instrument connections Basic connections for Model 2000 measurements are shown in Figure 1. These drawings show connections to the front panel terminals (INPUTS switch in the FRONT position). If using the rear panel terminals, place the 200

32、0-903-01A Page 6 Thursday, December 23, 1999 7:52 AM 7 INPUTS switch in the REAR position. Note that current (DCI and ACI) measurements cannot be made from the rear panel terminals. 0 MULTIMETER RANGE ! F 500V PEAK FRONT/REAR 2A 250V AMPS HI INPUT LO SENSE 4 WIRE INPUTS 350V PEAK 1100V PEAK AUTO RAN

33、GE R Model 2000 Measure DCV, ACV, 2, FREQ (PERIOD) or TEMP * * Temperature measurements are typically performed through a thermocouple scanner card, such as the Model 2001-TCSCAN. See the Users Manual for details. 0 MULTIMETER RANGE ! F 500V PEAK FRONT/REAR 2A 250V AMPS HI INPUT LO SENSE 4 WIRE INPU

34、TS 350V PEAK 1100V PEAK AUTO RANGE R Model 2000 Measure DCI or ACI 0 MULTIMETER RANGE ! F 500V PEAK FRONT/REAR 2A 250V AMPS HI INPUT LO SENSE 4 WIRE INPUTS 350V PEAK 1100V PEAK AUTO RANGE R Model 2000 Measure 4 R Figure 1. Basic measurement connections 2000-903-01A Page 7 Thursday, December 23, 1999

35、 7:52 AM 8 For resistance measurements ( 2 and 4) greater than 100k , more stable readings can be achieved by using shielding. Place the resistance in a shielded enclosure and connect the shield to INPUT LO. Shielded cable should be used such that the shield (INPUT LO) encir- cles the other cable co

36、nductor(s). Maximum inputs for the Model 2000 are summarized in Table 1. Basic measurement procedure 1. Connect the instrument as explained in “Instrument connection”. 2. From the function keys, select the desired measure- ment function. 3. Use the RANGE keys to select autoranging or a manual range.

37、 Pressing the AUTO range key tog- gles autoranging. You can select a different range with the L and M RANGE keys. 4. Take a reading from the display. Table 1. Maximum inputs FunctionMaximum input DCV1000V peak ACV750V rms, 1000V peak, 8 10 7 VHz DCI3A dc, 250V ACI3A rms, 250V FREQ (PERIOD)1000V peak

38、, 8 10 7 VHz 2000-903-01A Page 8 Thursday, December 23, 1999 7:52 AM 9 Storing readings (2 to 1024) 1. Set up the instrument for the desired confi guration. 2. Press the STORE key. 3. Use the , , L and M keys to select the number of readings to store in the buffer. 4. Press ENTER to start the storag

39、e process. The aster- isk (*) annunciator turns on to indicate a data stor- age operation. It turns off when the storage is fi nished. Recalling readings 1. Press the RECALL key. The BUFFER annunciator indicates that stored readings are being displayed. The arrow annunciator indicates that more data

40、 can be viewed with the , , L and M keys. 2. Use the , , L and M keys to navigate through the reading numbers, reading values, and statistics. For any of the buffer statistics (maximum, mini- mum, average, standard deviation) the STAT annunciator is on. 3. Use the EXIT key to return to the normal di

41、splay. Changing speed, resolution and fi lter RATE Measurement speed (reading RATE) can be changed for any measurement function except fre- quency, period, continuity and diode test. Use the RATE key to select FAST, MEDium or SLOW. Use FAST (0.1 PLC) if speed is of primary importance (at the expense

42、 of increased noise and fewer usable digits of resolution). SLOW (10 PLC) provides better noise performance at the expense of speed. MEDium (1 PLC) provides a com- promise between noise and speed. DIGITS Display resolution can be changed for any measurement function. Use the DIGITS key to select the

43、 desired number of digits (3 to 6 ). 2000-903-01A Page 9 Thursday, December 23, 1999 7:52 AM 10 FILTER Filter state (on/off) and confi guration can be changed for any measurement function, except fre- quency, period, continuity and diode test. The FILTER key toggles between fi lter on (FILT annuncia

44、tor on) and fi lter off. After pressing FILTER to enable the fi lter, you can then enter the fi lter count (1 to 100), and select the fi lter type (moving or repeating). (If the FILT annunciator is already on, press FILTER twice before entering the fi l- ter count.) Changing temperature measurement

45、confi guration Press SHIFT and then TCOUPL. Three choices are avail- able using the L and M keys: UNITS C, K or F. Specify units. TYPE J, K or T. Specify thermocouple type. JUNC SIM or CH1. Simulate a reference junction temperature (for direct thermocouple connection to the INPUT), or use the refere

46、nce junction (channel 1) provided on a switching card. In order to keep the reference calculations updated and accurate, Chan- nel 1 needs to be read periodically. To assign a value to a parameter, use the L and M keys to scroll to the desired parameter. Select the key, and use the L and M keys to s

47、croll through and choose the pre- ferred value. Select the ENTER key to save any changes. Relative (rel) Rel can be used to null offsets or subtract a baseline read- ing from present and future readings. When rel is enabled by pressing REL (REL annunciator on), the instrument uses the present readin

48、g as the relative value. Subsequent readings will be the difference between the actual input value and the rel value. You can defi ne a rel value for each function. Pressing REL a second time disables rel. 2000-903-01A Page 10 Thursday, December 23, 1999 7:52 AM 11 Math To enable and confi gure a math operation, press SHIFT and then the desired math key (MX+B, %, dBm or dB). Use the , , L and M keys to co