FLUKE 8040a 电路图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 maintenance manual John Fluke Mfg. Co., Inc. P.O. Box 43210 Mountlake Terrace, Washington 98043 / / RadioFans.CN 收音机爱 好者资料库 Table of Contents SECTION 1 TITLE PAGE INTRODUCTION AND SPECIFICATIONS . 1-1 1.1 . INTRODUCTION . 1-1 1.6 . SPECIFICATIONS . 1-2 OPERATING INSTRUCTIONS

2、. 2-1 2.1 . INTRODUCTION . 2-1 2.3 . SHIPPING INFORMATION . 2-1 2.6 . INPUTPOWER . 2-1 2.8 . OPERATING FEATURES . ; . 2-1 2.10 . OPERATING NOTES . 2-1 2- 12 . Fuse Replacement . 2-1 2- 14 . Overrange Indication . 2-1 2.16 . Input Overload r o t e c t l b i A . 2-1 2.18 . ASSEMBLY AND INITIAL OPERATI

3、ON . 2-3 2.22 . FUNCTION SELECTION EXAMPLES . 2-5 THEORY OF OPERATION . 3-1 3.1 . INTRODUCTION . 3-1 3.3 . OVERALL FUNCTIONAL DESCRIPTION . 3-1 . 3.4 . Introduction 3-1 3.6 . Analog Circuits . 3-2 3.8 . Digital Circuits . 3-2 3.10 . CIRCUIT DESCRIPTION . 3-2 3-1 1 . Introduction . 3-2 3.13 . Input D

4、ivider . 3-2 3.15 . Current Shunts . 3-2 3.17 . Buffer . 3-2 3.19 . A/ D Reference . 3-2 . 3.26 . Ohms Voltage Source 3-5 . 3.28 . RMSConverter 3-5 . 3.33 . A/DConverter 3-5 . 3.35 . Timing and Control 3-6 . 3.38 . Display 3-6 (Continued on next page) RadioFans.CN 收音机爱 好者资料库 SECTION TITLE PAGE 4 MAI

5、NTENANCE . 4-1 4-1 . INTRODUCTION . 4-1 . 4-4 . GENERAL MAINTENANCE . 4-2 4-5 . Access Information . 4-2 4-7 . Cleaning . 4-2 4-9 . Fuse Replacement . 4-2 4-1 1 . PERFORMANCE CHECK . 4-2 4-13 . DCVolts . 4-3 . 4-15 . ACVolts 4-3 . 4-17 . Resistance Measurements 4-3 . 4-19 . Directcurrent 4-3 4-2 1 .

6、 Alternating Current . 4-3 . 4-23 . CALIBRATION 4-5 . 4-26 . Required Method for Votlage Source Connection 4-5 4-29 . TROUBLESHOOTING . 4-8 5 LISTOFREPLACEABLEPARTS . 5-1 5.1 . INTRODUCTION . 5-1 5.4 . HOW TO OBTAIN PARTS . 5-1 5.7 . USE CODE EFFECTIVITY LIST . 5-1 6 OPTIONS yet the fold-away stand

7、allows the about each one is provided in Section 6. instrument to be positioned at a convenient angle for bench top use. 1-5. Note that two of the accessories, the 80T-150 1-3. The 8040A offers 20,000 count resolution in all temperature probe and A81 battery chargerleliminator, five functions which

8、provides measurement resolution to are configured at the factory for particular applications. 0.01 ohms on the 200 ohm rangeand I0 microvolts on the Insure that the correct form of the model number is used 200 millivolt range. AC voltage and current measure- when ordering either of these accessories

9、. Table 1-1. ACCESSORIES ACCESSORY 801 -600 80F-5 8OF-15 80K-40 81 RF 82R F OT-IOC 80T-150F C88 A80 8040A- 7004K DESCRIPTION Clamp-on current probe; 2 to 600 amps High voltage probe; 5 kV High voltage probe; 15 kV High voltage probe; 40 kV High frequency probe; 20 kHz to 100 MHz High frequency probe

10、; 100 kHz to 500 MHz Temperature probe; -50 to +I 5 0 -58 F to +302 F Carrying case Deluxe test lead kit A battery cover kit; includes 4 C size alkaline batteries ACCESSORY 8040A- 7005K 8040A- 7007 K A81-115 A81 -1 00 81-230- A81-230 DESCRIPTION A rechargeable Ni-Cad battery pack (batteries come sec

11、ured in the battery cover) A battery cover intended for use with alkaline batteries (batteries not included: Battery chargerleliminator for 11 5V, 50 to 60 Hz line source Battery charger/eliminator for IOOV, 50 to 60 Hz line source Battery chargerleliminator for 230V, 50 to 60 Hz line source (U.S. t

12、ype plug) Battery chargerleliminator for 230V, 50 to 60 Hz line source (European type plug) 1-6. SPECIFICATIONS DC Voltage Ranges: (Autorangingor Manual) . 31200 mV, *2V, f20V, f 200V, f I IOOV Accuracy: (6 months, 18 to 28C) 200 mV range: . +(0.05% of reading f 3 digits) 2V thru 1 lOOV ranges: . f(

13、0.05% of reading + 2 digits) Input Impedance: . 10 MR, all ranges Normal Mode Noise Rejection: . Greater than 60 dB at 50 Hz and 60 Hz Common Mode Noise Rejection: . Greater than 120 dB at 50 Hz and 60 Hz (1 kR in either lead) Maximum Input Voltage: . 200 mV and 2V ranges: A 500V dc or rms ac (conti

14、nuous) 1 IOOV dc or peak ac for less than 10 sec. 20V, 200V and 1 IOOV ranges: 1 IOOV dc or peak ac (continuous) AC Voltage (True rms) Ratiges: (Autoranging or Manual) . 200 mV, 2V, 20V, 200V, 750V Accuracy: (6 months, 18 to 28OC, from 5% of range to full range) 45 Hzto 10 kHz . +(0.5% of reading +I

15、0 digits) 10 Hz to 20 kHz . f (1.0% of reading +I0 digits) Input Impedance: . 10 MR in parallel with less than 100 pF Common Mode Noise Rejection: . Greater than 60 dB at 50 Hz and 60 Hz (1 kR in either lead) Crest Factor: . 3.0 Maximum Input Voltage: . 200 mV and 2V ranges: A 500V rms or 700V peak

16、ac (continuous) 750V rms, 1100V peak ac or lo7 volt-hertz (whichever is less), for less than 10 sec. 20V, 200V and 750V ranges: 750V rms, 1 IOOV peak ac or lo7 volt-hertz (whichever is less) DC mA Ranges: . +200 PA, 2 mA, 20 mA, 200 mA, 2000 mA Accuracy: (6 months, 18 to 28C) . -t(0.3% of reading +3

17、 digits) Voltage Burden: . 0.25V rms max. except 0.7V rms max. on 2000 mA range Maximum Input: 2 amps (fuse protected) , . AC Current (True rms, ac + dc) Ranges: . 200 pA,2 mA,20 mA,200 mA,2000 mA Accuracy: (6 months, 18 to 28C, from 5% of range to full range) 200 pA, 2 mA, 20 mA and 200 mA ranges:

18、45 Hz to 20 kHz . f (1.0% of reading +lo digits) 2000 mA range: 45 Hz to 3 kHz . +(1.0% of reading +10 digits) Voltage Burden: . 0.25V rms max. except 0.7V max. on 2000 mA range Crest Factor: . 3.0 Maximum Input: . 2 amps rms (fuse protected) Resistance Ranges:(AutorangingorManual). . 2000, 2 kn, 20

19、 k0, 200 k0, 2000 kfl, 20 Mf2 Accuracy: (6 months, 18 to 28C) . f (0.2% of reading +3 digits) except 20 M 0 range f (0.5% of reading +3 digits) Maximum CurrentThrough Unknown: . 0.5 mA on 200n range Open Circuit Voltage: . 5 volts Maximum Inputvoltage: . All ranges, 25OV ac or IOOV dc General . Maxi

20、mum Common Modevoltage: 500V dc or peak ac . Operating Temperature Range: 0C to +50C Temperature Coefficient: . I 1 10 of applicable accuracy specification per oc (0C to 18C, 28C to 50C) . StorageTemperatureRange: -40C to +70C (without batteries), -40C to +50C (with Ni-Cad batteries) Relative Humidi

21、ty: . 0 - 80% to +35C, 0 - 70% to +50C Line: . 1001 115/230V, 48-66 Hz, I W (instrument only) 8W (charging) max. Battery: . Rechargeable Ni-Cad pack (8 hr. typical operation from full charge, typical recharge time 14 hr. of ambient temperature TOLERANCE -00.02 to +00.02 -01 .OO to +01 .OO exactly -1

22、.9000 exactly +I .9000 -.0002 to +.0002 -1.8998 to -1.9002 -1.7998 to -1.8002 +189.98 to +190.02 +190.00V +I .9000V +I 9.000V OPEN +lOOO.OV SHORT -1OOO.OV - - - rnV L ! pA - rnV C ? pA - R 9 - - - R3 - - exactly +I 90.00 +I .8998 to +1.9002 +18.998 to +19.002 -01 .OO to +01 .OO exact1 y 1000.0 -00.0

23、2 to +00.02 -999.8 to -1 000.2 8040A Table 4-7. OHMS CALIBRATION 23. Turn R88 fully counterclockwise. Note the 8040A display; it should stop changing as the control reaches full counterclockwise rotation. . STEP 1 2 3 4 5 6 7 8 9 10 11 12 13 NOTE If the display does not stop changing center R88 then

24、 return to step 13 and repeat through step 23. Use a good quality shorting bar between the V-51 and COMMON input terminals. Connect the test leads that will be used to connect the 8040A to the decade resistance source. Place the short at the end of the test leads that will be connected to the resist

25、ance source. Note the resistance value indicated on the 8040A display. Add the lead resistance value to the input resistance value to determine the correct 8040A display. Add the lead resistance value to the tolerance figures. RANGE AUTO AUTO 2000 20051 AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO 2

26、4. Turn R88 clockwise slowly until the 8040A display changes by 1 or 2 digits. 25. Select the AC mA function and the 2 range. l NPUT SHORT SHORT 1 M51 1 0051 1 M51 10051 1.0 kR 10 k51 100 kR 1.0 M51 10 M51 10051 OPEN 26. Connect a voltmeter to TP2 and verify that the voltage level is between -0.070

27、and -I-0.070 volt dc. NOTE I f the level at TP2 is not within the specified limits repeat steps 14 through 26. ADJUST - - R47 R 10 R47 R10 - - - - - - - 27. Select the AC V function and 2 range. Apply 1.0000V ac at 200 H z to the 8040A V-R input terminal. Note the display. Apply 0.1000V ac at 200 Hz

28、 to the V-R input. TOLERANCE 00.00 to 00.02 - exact1 y 1000.0 exactly 100.00 exactly 1000.0 exactly 100.00 .9995 to 1.0005 9.995 to 10.005 99.95 to 100.05 999.5 to 1000.5 9.985 to 10.01 5 99.98 to 100.02 - DISPLAY 8040A 00.00 Lead Res. Value 1000.0 100.00 O 1000.0 100.00 1.0000 0 10.000 100.00 1000.

29、0 10.000 100.00 18.888 Flashing Adjust RlOO until the 8040A display indicate one-tenth of the reading observed in step 28. ANNUNCIATOR mV 51 pA mV 51 . PA - mV . 51 . pA - mV 51 pA - - - - M51 mV 51 pA M51 Repeat steps 28 through 30 until no adjustment of RlOO is required to obtain a one-tenth displ

30、ay. Apply 1.0000V ac at 200 Hz to the V-R input. Adjust RlOl for an 8040A display of exactly 1 .oooo. Apply 0.1000V ac at 200 Hz to the V-R input. The 8040A display should be between 0.0999 and 0.1001. Apply 0.0100V ac at 200 Hz to the V-R input. The 8040A display should be between oh099 and 0.0104.

31、 38. Apply 1.9000V ac at 200 Hz to the V-R input. 39. The 8040A display should be between 1.8980 and 1.9020. 40. Press the AUTO range switch and apply the voltages indicated in Table 4-8. Observe the 8040A for a display within the limits indicated. Table 4-8. LOW FREQUENCY AC V CHECK 41. Select the

32、750 AC range. INPUT 10.0 mV at 200 Hz 100 mV at 200 Hz 1.00V at 200 Hz 10.OV at 200 Hz l00V at 200 Hz 750V at 200 Hz 42. Apply 500V ac at 10k Hz to the V-R input. DISPLAY 9.93 to 10.07 99.95 to 100.05 0.9995 to 1.0005 9.9993 to 10.007 99.93 to 100.07 749.3 to 75.07 50. Remove all inputs from the 804

33、0A V-R input. 51. Select the DC mA function. 52. Select the ranges indicated in Table 4-10 and apply the associated current input to the mA input. Observe the 8040A for a display within the limits indicated. 53. Select the AC mA function and the 2 range. 54. Apply -I-1.9 mA DC to the mA input. 55. T

34、he 8040A display should be between 1.8800 and 1.9200. Table 4-10. DIRECT CURRENT ACCURACY CHECK 43. Adjust C3 for an 8040A display between 499.7 and 500.3. RANGE 200 PA 2 mA 20 mA 200 mA 2000 mA 4-29. TROUBLESHOOTING 44. Disconnect the input from the V-R input. INPUT +I 90 /.LA +I .9 mA +I9 mA +I 90

35、 mA +I 900 mA 45. Select the 200 range. DISPLAY +I 89.40 to +190.60 +I .8940 to +I .9060 +I 8.940 to +I 9.060 +I 89.40 to +I 90.60 +I 894.0 to +I 906.0 46. Apply lOOV ac at 10k Hz to the V-R input. 47. Adjust C2 for an 8040A display between 99.96 and 100.04. 48. Repeat steps 41 through 47 until both

36、 displays are within specification limits. 49. Press the AUTO range switch and apply the voltages indicated in Table 4-9. Observe the 8040A for a display within the limits indicated. Table 4-9. HIGH FREQUENCY AC V CHECK 4-30. The following information should be kept in mind while doing repair work o

37、n the 8040A. Inattention to these precautions may lead to instrument damage. INPUT 100 mV at 20 kHz 1.00V at 20 kHz 10.OV at 20 kHz I OOV at 20 kHz 500V at 20 kHz 500V at 5 kHz 1. MOS type integrated circuits can be damaged by discharging static electricity through the device. On the A 1 pcb the int

38、egrated circuits which are susceptible to damage are U22, U25 and U28; on the A2 pcb the sensitive components are U15 through U21, U23, U24 and U26; on the A3 pcb, U6, U7, U8 and U9; and A4 and A5 pcbs do not include MOS circuits. DISPLAY 99.30 to 100.70 .9930 to 1.0070 9.930 to 10.070 99.30 to 100.70 496.5 to 503.5 49