Fluke 8050A User manual

P/N 530907
October 1979 Rev 27/84
©1993 Fluke Cotporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies

Fluke Corporation (Fluke) warrants this instrument to be free from defects in material and workman-
ship under normal use and service for aperiod of 1year from date of shipment. Software is warranted
to operate in accordance with its programmed instructions on appropriate Fluke instruments, it is not
warranted to be error free. This warranty extends only to the original purchaser and shali not apply
to fuses, computer media, batteries or any instrument which, in Fluke’s sole opinion, has been subject
to misuse, alteration, abuse or abnormal conditions of operation or handling.
Fluke’s obligation under this warranty is limited to repair or replacement of an instrument which is
returned to an authorized service center within the warranty period and is determined, upon
examination by Fluke, to be defective, if Fluke determines that the defect or malfunction has been
caused by misuse, alteration, abuse, or abnormal conditions of operation or handling, Fluke will repair
the instrument and biii the purchaser for the reasonable cost of repair, if the instrument is not covered
by this warranty, Fluke will, if requested by purchaser, submit an estimate of the repair costs before
work is started.
To obtain repair service under this warranty purchaser must forward the instrument, (transportation
prepaid) and adescription of the malfunction to the nearest Fluke Service Center. The instrument shall
be repaired at the Service Center or at the factory, at Fluke’s option, and returned to purchaser,
transportation prepaid. The instrument should be shipped in the original packing carton or arigid
container padded with at least four inches of shock absorbing material. FLUKE ASSUMES NO RISK
FOR IN-TRANSIT DAMAGE.
THE FOREGOING WARRANTY IS PURCHASER’S SOLE AND EXCLUSIVE REMEDY AND IS IN
LIEU OFALL OTHER WARRANTIES. EXPRESSOR IMPLIED, INCLUDING BUT NOT LIMITEDTO
ANY IMPLIED WARRANTY OF MERCHANTABILITY, OR FITNESS FOR ANY PARTICULAR
PURPOSE OR USE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDEN-
TAL, OR CONSEQUENTIAL DAMAGES OR LOSS WHETHER IN CONTRACT, TORT. OR
OTHERWISE.
Immediately upon arrival, purchaser shali check the packing container against the enclosed packing
list and shall, within thirty (30) days of arrival, give Fluke notice of shortages or any nonconformity with
the terms of the order. If purchaser fails to give notice, the delivery shall be deemed to conform with
the terms of the order.
The purchaser assumes all risk of loss or damage to instruments upon delivery by Fluke to the carrier.
If an Instrument is damaged in transit, PURCHASER MUST FILE ALL CLAIMS FOR DAMAGE WITH
THE CARRIER to obtain compensation. Upon request by purchaser. Fluke will submit an estimate
of the cost to repair shipment damage.
Fluke will be happy to answer ail questions to enhance the use of this instrument. Please address your
requests or correspondence to: Fluke Corporation, P.O. Box 9090, Everett, WA 98206-9090, Attn:
Sales Department. For European Customers: Fiuke Europe B.V., P.O. Box 1186, 5602 B.D.,
Eindhoven, The Netherlands.
9/93

CHANGS/ERRATA INFORMATION
ISSUE NO: S5/93
This change/errata contains information necessary to ensure the accuracy of
the following manual. Enter the corrections in the manual if either one of
the following conditions exist:
1. The revision letter stamped on the indicated PCS is equal to or
higher than that given with each change
.
2. No revision letter is indicated at the beginning of the change/errata.
MANUAL
Title
:
Print Date:
Rev.- Date:
8050A
October 1979
2-7/84
C/E PAGE EFFECTIVITY
Page No. Print Date
1
2
3
7/85
9/88
5/93

8050A
1-
1, paragraph 1-2, change the following sentence,
oConductance measurements up to 100,000 M
oConductance measurements up to 100,000 Mequivalent resi
2-
6, Figure 2-4, change item 5,
PLACE 8050A mSERIES
PLACE 8050A IN SERIES
2-12, change paragraphs 2-43 and 2-44 to read:
Voltage Measurement
The following paragraphs contain additional information on
measurement techniques for voltage measurements.
On page 2-13, paragraph 2-54, change the second sentence,
FROM: This error is called the burden voltage.
TO: This voltage is called the burden voltage.
ERRATA #2
On page 2-3, following paragraph 2-21, add the following note:
NOTE
Asoftware error has been documented in the analog
to digital converter display sequence of the
proprietary integrated circuit, U17 .In all
ranges and functions, except negative dc volts and
conductance, three exact counts (347 1/2, 247 1/2,
and 147 1/2) cause the most significant digit to
occasionally display the next lower digit. One
condition, acount of exactly 47 1/2 causes the
display to occasionally indicate ail zeros. This
anomaly does not affect the function or accuracy
of the instrument.
ERRATA #1
On page
FROM:
TO:
On page
FROM:
TO:
On page
2-43.
2-44 .
stance
.
the
7/85 -1

8050A
ERRATA #3
On pages 5-8 and 601-8, Table 5-2 and 601-3, change R3,
FROM: R31 RES, MTL. FILM, 1000 +5%, 1/10W| 5142651 89536] 514265] 1
TO: R3 ]RES, MTL. FILM, 1000 +.05%, 1/lOW] 514265] 89536] 5142651 1
On page 5-9, Table 5-2, add the static sensitive symbol to U18, U19, and
U20 .
On page 601-9, Table 601-3, add the following:
U17^! IC, C-MOS, SI, N-CHANNEL, 40 PIN DIP] 524900] 89536] 524900] 1| 1
Ul8*i IC, SELECTED {8050A-450 6)I5159991 89536] 5159991 1] 1
U19*i IC, SELECTED (8050A-4506-Q1) I516005] 89536] 516005] 2| 1
U20*l IC, SELECTED (8050A-4506-01) j5160051 89536] 516005] REF
ERRATA #4
On page 4-7, Table 4-5, change the DISPLAY READING FOR steps 2and 3,
FROM: -37 .28 to -38.28
TO; -37.63 to -37.93
CHANGE #1 -27416
On pages 5-3 and 601-3, Tables 5-1 and 601-2,
CHANGE: MP25ITEST LEAD W/PROBE (Y8132) |516666 I89536 I516666 ]1
TO: MP25ITEST LEAD (TL70) i642033 I89536 !642033 1
1
ERRATA #5
On page 1-4, Table 1-2, for both DC Current and AC Current, change the
BURDEN VOLTAGE specifications,
FROM: 0.3V max
0.9V max
TO; 0.3V typical
0.9V typical
ERRATA #6
On page 4-2, Table 4-1, add the following to the bottom of the table:
AC Calibrator AC Voltage 100 mV to lOOV John Fluke Model 5200A 20
Hz +/-.!%
On page 4-6, add the following information:
4-35a. Use the following procedure to verify proper operation of the
low frequency ac voltage measurement functions:
7/85 2

8050A
1. Connect the AC Calibrator to the 8050A as follows: HI to the V/K
/S input connector and LO to the COMMON input connector.
2. For each step in Table 4-4a, select the switch positions shown
and adjust the AC Calibrator to the required 8050A voltage input
level and frequency, then verify that the 8050A display is within
limits
.
3. This concludes the low ac linear voltage test. If desired,
proceed directly to the dB Voltage Test.
Table 4-4a. Low Frequency AC Linear Voltage Test
‘
UUT INPUT DISPLAY *
STEP RANGE LEVEL FREQUENCY READING
120b raV 100 mV 20 Hz 98.90 -101.10
22.0V 1.OV 20 Hz '.9890 -1.01 10
320V lOV 20 Hz 9. ago -10.110
200V lOOV 20 Hz 98.90 -101 .10
*Typically 2to 4digits of rattle with be observed.
On Table 4-4, change the the following in the DISPLAY READING,
Change step 12,
FROM: 985 to 1015 .TO: .0985 to .1015
CHANGE #2 -34461
On page 5-3, Table 5-1,
CHANGE: H2 iSCREW, PHP, 6-32X1/2 1320051 i89536 |32005112
TO: H21 SCREW, PHP, 6-32X1/2 !853770 i8953 6i853770 I2
ERRATA #7
On page 4-8, paragraph 4-51, step 1, change reference of MP20 to MP31.
On page 4-9, Figure 4-2,
CHANGE: MP20 CHANGE: MP21
TO: MP32 TO: MP31
On page 4-10, paragraph 4-53, step 1, change reference of MP21 to MP32.
5/93 -3

Table of Contents
SECTION TITLE
1INTRODUCTION AND SPECIFICATIONS 1-1
1-1. INTRODUCTION M
M. OPTIONS AND ACCES SORIES M
1-
5. SPECIFICATIONS M
2OPERATION 2-1
2-
1. INTRODUCTION 2-1
2-3. SETTING UP YOUR INSTRUMENT 2-1
2-4. Unpacking 2-1
2-8. AC Line Voltage Requirements 2-1
2-10. Fuse Replacement 2-1
2-13. FRONT PANEL FEATURES 2-2
2-15. Display 2-2
2-18. SIGNAL INPUT LIMITS 2-2
2-20. OPERATING TECHNIQUES 2-3
2-22. AC/ DC Voltage (V) 2-3
2-24. AC/ DC Current (mA) 2-3
2-26. Resistance (D) 2-7
2-28. Conductance (S =in) 2-7
2-30. Diode Test 2-7
2-32. Relative (RELATIVE) ','.'.'.'.2-1
2-36. Decibel (dB) 2-11
2-38. INITIAL CHECKOUT PROCEDURE !!!!!!.!!!! 2-12
241. APPLICATIONS 2-12
2-43. DC Voltage Measurement 2-12
2-51. Current Measurement 2-13
2-56. Resistance Measurement 2-13
2-62. Conductance Measurement 2-14
2-80. Relative Measurement 2-16
2-
84. AC Voltage and Current Measurement 2-16
3THEORY OF OPERATION 3-1
3-
1. INTRODUCTION 34
3-3. FUNCTIONAL DESCRIPTION 3-1
3-5. CIRCUIT DESCRIPTION 3-1
i(continued on page ii)

TABLE OF CONTENTS, continued
SECTION TITLE PAGE
3-7. A/D Converter 3-1
3-18. Microcomputer 3-2
3-20. Signal Conditioning 3-6
3-31. True-RMS Converter 3-8
3-38. Touch-Hold Circuit 3-8
3-40. Voltage Protection 3-8
3-43. Current Protection 3-8
4MAINTENANCE 4-1
4-1. INTRODUCTION 4-1
44. SERVICE INFORMATION 4-1
4-7. GENERAL INFORMATION 4-1
4-9. Interior Access 4-1
4-24. dB Reference Impedance Power-Up Setting 4-4
4-26. Cleaning 4-5
4-28. PERFORMANCE TESTS 4-5
4-30. Initial Procedures 4-5
4-32. Display Test 4-5
4-34. Linear Voltage Test *4-6
4-36. dB Voltage Test ^4-6
4-38. Current Test |4-7
4-40. Resistance and Conductance Tests 4-7
4-42. CALIBRATION ADJUSTMENTS ...i 4-8
4-44. DC Calibration \4-8
4-46. AC Calibration |4-8
4-48. Jumper Selection I4-8
4-
57. TROUBLESHOOTING i4-12
5LIST OF REPLACEABLE PARTS 5-1
TABLE OF CONTENTS 5-1
5-
1. INTRODUCTION 5-2
5-3. PARTS ORDERING INFORMATION 5-2
6OPTIONS AND ACCESSORIES 6-1
TABLE OF CONTENTS 6-1
INTRODUCTION 6-2
ACCESSORIES 600-1
OPTIONS 601-1
7SCHEMATIC DIAGRAMS 7-1
TABLE OF CONTENTS 7-1

TABLE TITLE
I-l. 8050A Accessories ]_2
1-
2. 8050A Specifications 1-2
2-
1. 8050A Controls, Indicators, and Connectors 2-3
2-
2. Maximum Input Signal Limits 2-5
3-
1. AC Buffer Gains 3-8
4-
1. Required Test Equipment 4-2
4-2. dB Impedance Selection 4-4
4-3. Display Test 4-5
44. Linear Voltage Test 4-6
4-5. dB Voltage Test 4-7
4-6. Current Test 4_7
4-7. Resistance and Conductance Tests 4-8
4-8. DC Calibration 4. 10
4-9. AC Calibration 4-10
4-10. U5 Jumper Positions 4-11
4-II. U33 Jumper Positions 4-12
4-12. Test Points 4_I3
4-13. Troubleshooting Guide 4_14