KEI 485 Quick Reference Guide 电路图.pdf

《KEI 485 Quick Reference Guide 电路图.pdf》由会员分享，可在线阅读，更多相关《KEI 485 Quick Reference Guide 电路图.pdf（32页珍藏版）》请在收音机爱好者资料库上搜索。

1、MODEL 485 AUTORANGING PICOAMMETER QUICK REFERENCE GUIDE RadioFans.CN 收音机爱 好者资料库 INTRODUCTION This reference and programming guide contains condensed specifica- tions and information which describes the various features of the Model 485. Each feature is described in three segments of informa- tion. T

2、he first segment describes the features. The second segment gives an exact procedure on how to use the feature. The third seg- ment gives application examples. These segments are brief, but the information presented in this format is designed for a quick reference of the Model 485 features and funct

3、ions. Refer to the Model 485 In- struction Manual for complete information and essential safety infor- mation. With the Model 4853 IEEE-488 interface installed, the Model 485 can be controlled over the IEEE-488 bus. This booklet also contains infor- mation concerning Model 485 bus operation. Several

4、 example pro- grams using some commonly used controllers are outlined to get the Model 485/4853 “up and running”. CONTENTS CONDENSED SPECIFICATIONS . 2 MODEL485 FEATURES . 5 IEEE-488 PROGRAMMING. . 13 PROGRAMS . 18 IBM-PCorXTPersonalComputer. . 19 (Keithley Model 8573 Interface) APPLE II (Apple Inte

5、rface) . 21 HP-85 . 22 HP-9825A. . 23 HP-9816 . 24 HP-9845B. . 25 TEK4052 . 26 DECLSIll. . _. . _.- 27 PETlCBM2001 . 29 EH 7000 Computer . 30 01984. Keithley Instruments, Inc. Cleveland, Ohio, U.S.A. Document Number: 485903-OlA 1 RadioFans.CN 收音机爱 好者资料库 CONDENSED SPECIFICATIONS Range 2nA 20 nA 2Oiln

6、A J Resolution O.lpA 1 PA 10 pA 100 nA 1llA 10 nA 100 nA Accuracy (1 year) Maximum 18O -2WC Continuous *(%rdg + countsIt InputS 0.4 + 4 35OVdc 0.4 -t 1 35OVdc 0.2 + 1 35OVdc 0.15 + 1 35OVdc 0.1 +1 5OVdc 0.1 +1 5OVdc 0.1 +1 5OVdc 1 WThe rn- strument can be calibrated from the front panel or with the

7、optional 4353 IEEE interface. With the Model 4653 IEEE-488 interface installed, the Model 465 can be calibrated much faster using an automated system. Front panel digital calibration is outlined as follows: NOTE The following is an actual calibration procedure for the 2Ofi range. If recalibration is

8、 not necessary, then do not move the calibration jumper. Leave the jumper in the disable position. Refer to the Maintenance Sec- tion of the 465 Instruction Manual for jumper place- ment. 1. Move the calibration jumper to the enable position. 2. Turn on the Model 465. 3. Press the REL and LOG button

9、s simultaneously until the message “CAL” is displayed. Release the buttons. The Model 465 is now in the calibration mode as indicated by the “CAL” annunciator. 4. Apply the proper signal or level to the Model 465 input. Example: place the Model 465 to the 2Ofi range and apply 19.066. NOTE Consult th

10、e Model 465 Instruction Manual for detailed methods of creating the proper calibration levels. 5. Adjust the display accordingly with the usa of the STOKLR and RCL buttons. The STOKLR button increments the displayed reading. The RCL button decrements the displayed reading. 6. Press the LOG and REL b

11、utton simultaneously until the massage “STOR” is displayed. The “new” calibration point for the 2CMDS 70 IF CMDS=“EXIT” THEN 140 60 IF CMD$=“” THEN 60 90 CALL IBWRT(M485%,CMDS) 100 RDS=SPACE$(BO) 105 CALL IBRD (M485%, RD91 110 RDS= LEFWRDS,IBCNT%) 120 PRINT RDS 130 GOT0 120 140 V% =B$ 40 PR#3 50 IN#

12、3 60 PRINT “RA” 70 PRINT “W-i%“Z$B$ r , 80 PRINT “LFl” 90 PRINT “RDV”.Z$.:INPUT , r ” I; AS 100 PRINT “UT 110 PR#O 120 IN#O 130 PRINT A$ 140 GO TO 30 COMMENTS Dimension data string. Terminator Enter programming command. Example: 2B$ Prompt the 465. 50 EMER 722;A$ Get data from 485. 60 DISPAS 70 GO T

13、O 20 Repeat 80 END NOTE: If mnvetion IO numeric variable is needed, change line 60 m follows: 60 DISP VALLASWI 22 HP 9825A The following program obtains one reading from the Model 485 Picoam- meter and displays the reading on the HP 9825A using a 98034A HPIB interface and a 9872A extended I/O ROM. D

14、lRECTfONS 1. Using the rear panel switches set the primary address of the Model 485 to 22 l101101. .- - .-.-,. 2. Connect the Model 485 to HP 9825A and 98034A HPIB interface. 3. Enter the following program using the STORE key after each line is typed. Line numbers are automatically assigned by the 9

15、825A. 4. Depress the RUN key. 5. The display will read “TEST SETUP”. 6. To program the Model 485 to the w range and tak8 a reading, type in R4TlX and depress the CONTINUE key. 7. The displav will read NDCA + O.OOOOE-6 when the Model 485 is in Zero Check. PROGRAM 0 dim A$L!O,B$I201 1 dev”485”,722 2 r

16、em”485” 3 ent”TEST SETUP”,B$ 4 wrt”485”,BS 5 redWW,A$ 6 prtA$ 7 gto3 COMMENTS Dimension data strings. Define Model 485 address 22. Set to remote. Enter programming command. (Example: w range = R4TlX) Output program command to Model 485 via IEEE bus. Read data from Model 485 via IEEE bus. Print data

17、on hard copy printer. Repeat. NOTE: If conversion to numeric variable is desired, omit line 6 and 7 and substitute: 8 “e” - A$13,131;flt5 Convert to numeric variable. 7 prt valtASf51) 8 gto3 Repeat 23 HP 9818 The following program sends a command string to the Model 485 Piwammeter, reads data and di

18、splays the data on the HP 9816 CRT, us- ing BASIC 2.0. DIRECTIONS 1. Using the rear panel switches set the primary address of the Model 485 to 22 (10110). 2. Wnh the power off, connect the Model 485 to the HP 9816 and HP 82937A GPIB interface. 3. Type EDIT and press the EXEC key. 4. Enter the follow

19、ing program using the ENTER key after each line is 8. The display will r AS 40 ENTER 722;B4 50 PRINT BS 60 GOT020 70 END 5. Press the HP 9815 RUN key. 6. The display will read TEST SETUP”. 7. To program the Model 485 to the B 50 PRtNTB 24 HP 98458 The following program obtains one reading from the M

20、odel 485 Picoam- meter and displays the reading on the 98458 screen using a 98034A HPIB interface and an I/O ROM. DIRECTIONS 1. Using the rear panel switches set the primary address of the Model 485 to 22 IlOllO). 2. Connect the Model 485 to the HP 98458 and the 98034A interface. 3. Enter the follow

21、ing program using the STORE key after each line. 4. Depress the RUN key. 5. The display will read “TEST SETUP” in the lower left comer. 6. To program the Model 485 to the 2B$ (Example: 2$1 rang8 = R4TlX). Output program command to Model 485 via IEEE bus. 50 ENTER W35;A9 Read data from 485 via IEEE b

22、us. 60 PRINT A$ Print data on 98458 CRT. 70 GO TO 30 Repeat NOTE: If conversion to numeric variable is desired, omit line 60 and substitute: 60 PRINT VAL(A$IB,lll) Convert string to numeric value. 70 GO TO 30 Repeat 25 TEK 4052 The fBS 30 PRINT press the return key after each line is typed. The comp

23、lete program including the GPIB handler software may now be saved in the usual manner. 5. Press the computer F2 key to run the program. The CRT will prompt with COMMAND?. 6. TVpe in the desired command. For example: To program the instru- ment to the w range and take a reading, type in R4TIX and pre

24、ss the return key. 7. The computer CRT will then display the instruments data string on the CRT. For example: with the Model 485 on the w range and with Zero Check enabled, the data string reads NDCA f O.OOOOE-6. PROGRAM COMMENTS 10 CLS 20 GOSUB 65010 Initialize handler software. 30 CALL PORT1 Initi

25、alize Port 1. 40 CALL INIT Initialize interface. 50 DEV$=“22” Primary address = 22. 60 INPUT “COMMANDCG 70 IF C$ = ” ” THEN sd Prompt for command string. If null input go back. 80 INS = SPACES 120) Define reading buffer. 90 CALL SNDSTRlDEVS,C$) Send command string to 4135. 100 CALL RCVSTR(DEV$,INS) Get reading from 485. 110 PRlNT INS Display reading string on CRT. 120 GO TO 60 Repeat NOTE: For conversion to numeric variable, change line 110 to: 110 PRINT VALfMIDS(tN$,5,152) 30 Test Instrumentation Group 28775 Aurora Road /Cleveland, Ohio 44139