KEI 485 Instruction 电路图.pdf

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1、Model 485 Autoranging Picoammeter Instruction Manual Contains Operating and Servicing Information RadioFans.CN 收音机爱 好者资料库 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley Instruments,

2、Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation. During the warranty period, we will, at our option, either repair or replace any product that proves to be defective. To exercise this warranty, write or cal

3、l your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid.

4、Repaired or replaced products are warranted for the balance of the origi- nal warranty period, or at least 90 days. LIMITATION OF WARRAN-IY This warranty does not apply to defects resulting from product modification without Keithleys express written consent, or misuse of any product or pwt. This war

5、ranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions. THIS WARRANTY IS IN LlBU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR

6、FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE AND EXCLUSIVE REMEDIES. NEITHER KBITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI- RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWA

7、RE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY Keithley Instruments, I

8、nc. - 28775 Aurora Road *Cleveland, OH 44139216-248-0400 -Fax: 216-248-6168 * RadioFans.CN 收音机爱 好者资料库 Model 485 Autoranging Picoammeter Instruction Manual 0 1984, Keithley Instruments, Inc. Test Instrumentation Group All rights reserved. Cleveland, Ohio, U.S.A. January 1990, Sixth Printing Document

9、Number: 485-901-01 Rev. F RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS RANGE RESOLUTION 2nA O.lpA 20 “A 1 PA 200 “A 10 pA 2 PA 100 PA 20 !A 1 nA 200 ,A 10 “A 2mA 100 “A ACCURACY I1 YEAR, lW28C * l%rdg + countslt 0.4 + 4 0.4 + 1 0.2 + 1 0.15 + 1 0.1 + 1 0.1 +1 0.1 +1 NORMAL MODE ANALOG REJECTION MAXIMUM RI

10、SE TIME RATIO CONTINUOUS I10 .SO%, IS0 or EOHz, INPUTt 60ms 7OdB 350”dC 60iTlS 7OdB 350Vdc 6rnS 65dB 350Vdc 3ms 6FdB 350Vdc 3ms 65dB 5O”dc lms 65dB 5OVdc lms 55dB 5OVdc ,NP”T VOLTAGE BURDEN: Less than 200 -6.301 = +O.$Al. IEEE-488 BUS IMPLEMENTATION (Option 48631 MULTILINE COMMANDS: DCL, SDC, GET, G

11、TL, “NT. UNL. SPE. SPD. UNILINE COMMANDS: IFC, REN EO,. SRC. ATN. INTERFACE FUNCTIONS: SHl. AH, T5. TEO. L4, LEO. SRI, RL2, PPO. DCl, DTI, CO, El. PROGRAMMABLE PARAMETERS: Zero Check. Range, REL. LOG, Trig- ger, Calibration. EO, SRO, Status. 0”tp”t Format. Terminator. GENERAL DISPLAY: 4% digit LCD,

12、0.5” height: polarity. range and staf”s indication. OVERRANGE INDICATION: “OL” displayed. CONNECTORS: Input: ENC. Analog Output: Banana Jacks. OPERATING ENVIRONMENT: 0-50.X. less than 70% R.H. up to 35C: linearly derate 3% R.H./OC up to 5OOC. STORAGE ENVIRONMENT: -25O to +BO”C POWER: lOF,-125V or 21

13、0.250V (switch selected,. go-llOV available. SO-6OHr. 12 VA. DIMENSIONS, WEIGHT: 65mm high Y 235mm wide x 275mm deep. (3%” x 9%” x lO%“,. Net Weight: 1 .Skg I4 Ibs.) ACCESSORIES AVAILABLE: Model 1010: Model ,017: Model 1664: Mods, 1758: Model 4801: Model 4603: Model 4653: Model 7006-3: Model 7006-6:

14、 Model 6573: Single Rack Mounting Kit Dual Rack Mounting Kit Hard Shell Carrying Case Rechargesble Battery Pack Low Noise Input Cable (4ft.l. BNC to ONC Low Noise Cable Kit IEEE-486 Interface IEEE-466 Digital Cable 13ft.b IEEE-468 Digital Cable 16 ft.1 IEEE-488 Interface for IBM PC Specifications su

15、bject to change without notice. TABLE OF CONTENTS 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 2.1 2.2 2.2.1 2.2.2 2.2.3 2.3 2.4 2.4.1 2.4.2 2.4.3 2.4.4 2.5 2.6 2.7 2.7.1 2.7.2 2.7.3 2.7.4 2.75 2.7.6 2.7.7 2.8 2.8.1 2.8.2 2.8.3 2.8.4 2.8.5 2.9 2.9.1 2.9.2 2.9.3 2.9.4 2.9.5 3.1 3.2 i: 3.5 SECTION l-GENERAL INFORM

16、ATION Introduction. . . . . . Getting Started . . . . . Unpacking and Inspection . . . . . Specifications . . . . . Warranty Information. . . . . . Manual Addenda . . . . . . Safety Symbols and Terms . . . . . Optional Accessories . . . . . l-1 1-l l-l l-l l-l 1-2 1-2 l-2 SECTION Z-BENCH OPERATION i

17、ntroduction . PreparationforUse . Line Power . Battery Pack Power . BatteryCharging . TntBail . Model 485 Familiarization . Display . FrontPanelControls . InputConnector . AnalogOutputConnectors . Error Messages . EnvironmentalCondition . BasicBenchMeasurements . Power-Up . Zero Check . Current Meas

18、urements . RelativeMode . LOGMode . Inverting Analog Output . MIN/MAXand 100 Point Data Store . MeasurementConsiderations . SourceResistance . SourceCapacitance . LeakageResistance . ZeroTimeStability . Groundingconsiderations . 2-l 2-l 2-l 2-l 2-l 2-1 2-l 2-l 2-2 2-2 2-2 2-2 2-3 2-3 2-4 2-4 2-4 2-4

19、 2-5 2-5 2-6 2-6 2-6 2-7 2-8 2-8 2-8 Applications . . Op Amp Offset Current . . FET Gate Leakage and Channel Current. . . Insulation Leakage Currents and High Resistance. . . Phototube, Photodiode and Beam Currents . . Resistivity Tests . . SECTION 3-PERFORMANCE VERIFICATION Introduction . Environme

20、ntal Conditions . Recommendrsd Test Equipment . Initial Conditrons . Verification Procedure . ,. ,. . . . . . 3-l 3-l ,. 3-l 3-1 3-l i TABLE OF CONTENTS (CONT.) 4.1 4.2 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 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 5.4.1 5.4.2 5.4.3 5.4.4 5.4.5 5.5 5.6 5.6

21、.1 5.62 5.63 5.6.4 5.6.5 5.7 5.8 5.9 6.1 if 6.4 6.5 SECTION 4-THEORY OF OPERATION Introduction . 4-l Overall Functional Description. . 4-l AnalogCircuitry . 4-l Current-to-Voltage Converter . 4-1 Multiplexer .4-2 InputBufferAmplifier . 4-2 -2VReferenceSource . 4-3 AIDConverter. . 4-3 Digital Circuit

22、ry . 4-4 Microcomputer . 4-4 Address Decoding . 4-4 PIA . 4-4 DisplayBoard. . 4-4 Digital Calibration . 4-4 PowerSupply . 4-4 Model 1758 Battery Option . 4-4 SECTION 5-MAINTENANCE Introduction . 5-I Top Cover Removal/Installation . 5-l Battery Pack (Model 1758) Installation . 5-l Front Panel Calibra

23、tion . 5-l Recommended Calibration Equipment. . 5-1 CalibrationJumper . 5-2 Environmental Conditions . 6-2 Calibration Procedure. . 5-2 CalibrationStorage . 5-2 Calibration Over IEEE-488 Bus . 5-3 Troubleshooting . 5-3 Recommended Test Equipment . 5-3 Self Diagnostic Program . 5-3 Power Supply and B

24、attery Pack (Model 1758) Checks . 5-6 A/D Converter and Display . 5-6 SignalConditioning . 5-7 Input Amplifier NJ105) Balancing . 5-7 LineFuseReplacement . 5-7 Special Handling of Static Sensitive Devices., . 5-8 SECTION B-REPLACEMENT PARTS Introduction . 6-l ReplaceableParts . 6-l Ordering Informat

25、ion . 6-l FactorySen/ice . 6-l Component Location Drawings and Schematic Diagrams . 6-l ii LIST OF ILLUSTRATIONS 2-1 2-2 2-3 2-4 2-5 2-6 2-7 Z-8 2-9 2-10 3-l 4-l 4-2 4-3 4-4 4-5 5-I 5-2 6-l 6-2 6-3 6-4 6-5 6-6 6-7 6-8 Model485FrontPanel . 2-2 Model 465 Inverting Analog Output . 2-6 Simplified Model

26、for Input Signal Conditioning . 2-7 Test Fixture Guarding . 2-8 LeakageTestSetUpUsingModel6104 . 2-8 Op Amp Input Offset Currents Measurement . 2-8 F5T Gate Leakageand Channel Currents Measurement. . 2-9 Insulation Leakage Currents end High Resistances Measurement . 2-9 Set Up to Measure Photomultip

27、lier, Photodiode end Beam Currents . , 2-9 ResistivityTestSetUp . Z-IO Shielded Test Fixture . 3-2 Simplified Block Diagram . 4-l Current-to-Voltage Converter . 4-2 Simplified Schematic of the Multiplexer . 4-2 Simplified Schematic of the Input Buffer Amplifier . 4-2 AIDConverter . 4-3 Segmentldentification . 5-4 JumperLocations . 5-7 Model485MiscelianeousParts . 6-2 Display Assembly .