Fluke 8050A User manual

P/N 530907
October 1979 Rev 2 7 /84
®1984, John Fluke Mfg. Co., Inc. All rights reserved. Lithe in U.S.A.
8050A
Digital
Multimeter
Instruction Manual
IFLUKE:I
======®

WARRANTY
Notwithstanding
any provision of any agreement the
following
warranty is exclusive:
The
JOHN
FLUKE MFG. CO., INC., warrants each instrument
it
manufactures to be free from defects in material and
workmanship
under
normal
use and service
for
theperiod of1-yearfrom date
of
purchase. This warrantyextends
only
to the
original
purchaser.
This
warranty shall not apply
to
fuses, disposable batteries (rechargeable
type
batteries are
warranted
for
90-days),
or
any
product
or
parts
which
have been subject to misuse, neglect, accident,
or
abnormal
conditions
of
operations.
In the event
of
failure
of
a
product
covered by this warranty,
John
Fluke Mfg. Co., Inc., will repair and calibrate
an
instrument returned to
an
authorized Service Facility
within
1year
of
the original purchase; provided the warrantor's
examination discloses
to
its satisfaction that the
product
was defective. The warrantor may, at its optioh, replace the
product
in lieu
of
repair. With regard
to
a_ny
instrument returned
within
1year
of
the original purchase, said repairs
or
replacement will be made without charge.
If
the failure has been caused by misuse, neglect, accident,
or
abnormal
conditions
of
operations, repairs
will
be billed at a nominal cost. In such case,
an
estimate
will
be submitted before
work is started, if requested.
THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING
BUT
NOT
LIMITED TO ANY IMPLIED WARRANTY
OF
MERCHANTABILITY, FITNESS,
OR ADEQUACY FOR ANY PARTICULAR PURPOSE OR USE.
JOHN
FLUKE MFG. CO., INC.,
SHALL
NOT
BE
LIABLE
FOR ANY SPECIAL,
INCIDENTAL,
OR
CONSEQUENTIAL
DA~AGES,
WHETHER IN
CONTRACT,
TORT,
OR
OTHERWISE.
If
any failure occurs, the following steps should be taken:
1.
Notify
the
JOHN
FLUKE MFG. CO., INC.,
or
nearest Service facility, giving full details
of
the
difficulty,
and
include
the model number,
type
number, and serial number. On receipt of this information, service data,
or
shipping
instructions
will be forwarded to you.
2.
On receipt
of
the shipping instructions, forward the instrument, transportation prepaid. Repairs will be
made at the Service Facility and the
instrument
returned, transportation prepaid.
SHIPPING TO MANUFACTURER FOR REPAIR
OR
ADJUSTMENT
All shipments of
JOHN
FLUKE MFG. CO., INC., instruments
should
be made via United Parcel Service
or
"BestWay'
..
prepaid. The instrument
should
be shipped in the original
packing
carton;
or
if
it is not available, use any suitable
container
that
is rigidand
of
adequatesize.
If
asubstitute
container
is used, theinstrument
should
be wrapped in paper
and
surrounded
with at least four inches
of
excelsior
or
similar shock-absorbing material.
CLAIM FOR DAMAGE IN SHIPMENT
TO
ORIGINAL PURCHASER
The
instrument
shoula
be
thoroughly
inspected immediately
upon
original delivery to purchaser. All material in the
container should be
checked
against theenclosed
packing
list. The
manufacturer
will notbe responsible
for
shortages
against
the
packing sheet unless notified immediately. Ifthe
instrument
is damaged in anyway, aclaim should be filed
with the carrier immediately. (To obtain a
quotation
to
repair
shipment
damage, contact the nearest FlukeTechnical
Center.) Final claim and negotiations with the carrier must be completed by the customer.
The
JOHN
FLUKE MFG. CO., INC,
will
be
happy
to
answer all
applications
or
use questions,
which
will enhance
your
use
of
this instrument. Please address
your
requests
or
correspondence to:
JOHN
FLUKE MFG. CO., INC., P.O. BOX
C9090, EVERETT,
WASHINGTON
98206,
ATTN:
Sales Dept.
For
European Customers: Fluke (Holland) B.V., P.O. Box
5053, 5004 EB, Tilburg,
The
Netl1erlands.
*For European customers,
Air
Freight prepaid.
John Fluke Mfg. Co., Inc., P.O. Box C9090, Everett, Washington 98206
Rev.
6/81

Table of Contents
SECTION TITLE PAGE
1 INTRODUCTION AND SPECIFICATIONS
............................ 1-1
1-1. INTRODUCTION ............................................ 1-1
1-4. OPTIONS AND ACCESSORIES ............................... 1-1
1-5. SPECIFICATIONS ........................................... 1-1
2 OPERATION ....................................................... 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 (il) .............................................. 2-7
2-28. Conductance (S = lil) ....................................... 2-7
2-30. Diode Test ................................................. 2-7
2-32. Relative (RELATIVE) ....................................... 2-7
2-36. Decibel (dB) ................................................ 2-11
2-38. INITIAL CHECKOUT PROCEDURE .......................... 2-12
2-41. 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
3 THEORY OF OPERATION ........................................... 3-1
3-1. INTRODUCTION ............................................ 3-1
3-3. FUNCTIONAL DESCRIPTION ............................... 3-1
3-5. CIRCUIT DESCRIPTION ..................................... 3-1
(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
4 MAINTENANCE . .. . . .. .. ..... . .... . ... . . . .... ... . . ... ... . . . . . .. . .. .
4-1
4-1. INTRODUCTION
............................................
4-1
4-4. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8
4-44.
DC
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8
4-46. AC Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8
4-48. Jumper Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8
4-57. TROUBLESHOOTING
.......................................
4-12
5 LIST
OF
REPLACEABLE
PARTS
. . .. . .. . . . .. ..... . . . ... .... . . .. ... ..
5-1
TABLE
OF
CONTENTS
......................................
5-1
5-1.
INTRODUCTION
............................................
5-2
5-3.
PARTS ORDERING INFORMATION
.........................
5-2
6 OPTIONS AND ACCESSORIES ... .. .. .. . . .. ..... . . . ... .... . . . ... ...
6-1
TABLE
OF
CONTENTS
......................................
6-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
ACCESSORIES
..............................................
600-1
OPTIONS
...................................................
601-1
7 SCHEMATIC DIAGRAMS
...........................................
7-1
TABLE
OF
CONTENTS
......................................
7-1
APPENDIX A . . .. . . .. .. .. .. . .. . .. . .. . .. .. .. . . .... . . .. .. . ... . ... . . . ..
A-1
ii

-
TABLE
1-1.
1-2.
2-1.
2-2.
3-1.
4-1.
4-2.
4-3.
44.
4-5.
4-6.
4-7.
4-8.
4-9.
4-10.
4-11.
4-12.
4-13.
List of Tables
TITLE
8050A Accessories ................................................ .
8050A Specifications
.............................................. .
8050A Controls, Indicators, and Connectors
.......................... .
Maximum Input Signal Limits ...................................... .
AC Buffer Gains .................................................. .
Required
Test Equipment .......................................... .
dB Impedance Selection
........................................... .
Display
Test ..................................................... .
Linear Voltage Test
............................................... .
dB Voltage Test
.................................................. .
Current Test ..................................................... .
Resistance
and Conductance Tests .................................. .
DC Calibration ................................................... .
AC Calibration ................................................... .
U5
Jumper Positions .............................................. .
U33
Jumper Positions ............................................. .
Test Points
....................................................... .
Troubleshooting Guide
............................................ .
iii/iv
PAGE
1-2
1-2
2-3
2-5
3-8
4-2
4-4
4-5
4-6
4-7
4-7
4-8
4-10
4-10
4-11
4-12
4-13
4-14

-
FIGURE
Frontispiece
1-1.
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2-10.
2-11.
2-12.
2-13.
2-14.
2-15.
2-16.
2-17.
3-1.
3-2.
3-3.
3-4.
3-5.
3-6.
4-1.
4-2.
List of Figures
TITLE
8050A Digital Multimeter .......................................... .
8050A Dimensions ................................................ .
Controls, Indicators, and Connectors
................................ .
Liquid Crystal Display ............................................. .
AC/ DC Voltage Operation ......................................... .
AC/DC Current Operation ......................................... .
Resistance Operation .............................................. .
Conductance Operation ............................................ .
Diode Test Operation
............................................. .
Relative Operation
....... .- ........................................ .
dB Voltage Operation ............................................. .
Circuit Loading Error ............................................. .
Calculating Burden Voltage
Error ................................... .
Transistor Beta Test Fixture
........................................ .
dB Circuit Gain or Loss Measurements .............................. .
Waveform Comparisons ........................................... .
Crest Factor
..................................................... .
Total RMS Value
................................................. .
Measuring Amplifier Bandwidth •....................................
8050A Functional Block Diagram ................................... .
A/D Converter ................................................... .
A/D Converter Waveforms ........................................ .
Microcomputer Simplified Block Diagram ........................... .
Signal Conditioning ............................................... .
RMS Converter .................................................. .
Display PCB Access ............................................... .
Calibration Adjustment Locations ................................... .
v
PAGE
Vl
1-6
2-2
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-13
2-14
2-15
2-17
2-18
2-19
2-19
2-20
3-3
3-4
3-5
3-6
3-7
3-9
4-3
4-9

8050A Digital Multimeter
vi

Section 1
Introduction and Specifications
1-1. INTRODUCTION
1-2. Your JohnFluke Model8050A is a portable bench-
type digital multimeter
(D MM) with a 4-1/2 digit liquid
crystal display (LCD). The 8050A has all the following
industry-standard features:
• Voltage measurements from
10 µV to IOOOV deand
IO mV to 750V true-rms ac.
• Current measurements from I0 nA to 2A de and I0
µA to 2A true-rms ac.
• Resistance measurements from
IO mil to 20MO.
The 8050A also has severalspecial measurementfeatures.
These special features include the following:
•
•
•
•
Conductance measurements up to 100,000 MO.
Voltage measurements
in decibels, that can be
referenced to I
of 16 user selected reference
impedances.
Resistance ranges that supply enough voltage to
turn on a PN junction to allow diodes and
transistors to be tested.
The ability to store any input signal as an offset or
relative reference value.
•
•
•
Automatic polarity indication and overrange
indication.
Protection from overloads and protection from
transients
of up to 6 kV, IO microseconds.
Dual-slope integration
a/ d conversion to ensure
noise-free measurements.
• Long term calibration stability (I year).
1-3. The 8050A is warranted for a period of one year
upon shipment of the instrument to the original
purchaser. Conditions
of the warranty are given at the
front
of this manual. The8050A is typicallypowered from
ac line voltages but may be powered by the optional
rechargeable battery.
1-4. OPTIONS
and ACCESSORIES
l-5. The use
of the 8050A can be enhanced by the
accessories available for this instrument. The accessories
are listed in Table
1-1. This instrument can be ordered
with
the Option 8050A-O l Rechargeable Battery.
Detailed information on options and accessories is
contained
in Section 6 of this manual.
1-6. SPECIFICATIONS
1- 7. Specifications for the 8050A are listed in Table 1-2.
Specifications for the Option 8050A-Ol Rechargeable
Battery and other accessory specifications are given in
Section 6
of this manual.
1-1

INTRODUCTION
SPECIFICATIONS
MODEL
C86
Y8205
M00-200-611
M00-200-612
M00-200-613
80T-H
80T-150C
80T-150F
801-600
ELECTRICAL
Table 1-1. 8050A Accessories
DESCRIPTION MODEL DESCRIPTION
Ruggedized Carrying Case 80J-10 Current Shunt
Soft Carrying Case
BOK-6
High Voltage Probe
Offset Mounting Kit 80K-40 High Voltage Probe
Center Mounting Kit 83-RF
RF
Probe
Dual Mounting Kit 85-RF
RF
Probe
Touch-Hold Probe Y8100 DC/AC Current Probe
Temperature Probe, Celsius
Y8101
AC Current Transformer
Temperature Probe, Fahrenheit
Y8134
Deluxe Test Lead Set (safety designed)
Current Transformer
Y8140
Slim-Flex Test Leads
Table 1-2. 8050A Specifications
The electrical specifications given apply for
an
operating tem-
perature
of
18°C to 28°C (64.4°
Fto
82.4°
F),
relative humidityupto
90%,
and a 1-year calibration cycle.
Functions . .. . . .. . .. . .. .. . . .. . .. . . . .. . . .. . DC volts, AC volts (linear and dB), DC current,
AC
current,
resistance, diode test, conductance, relative.
DC Voltage
RANGE RESOLUTION ACCURACY for
1-Year
±200 mV
10µV
±2V
100µV
±20V 1 mV ±(0.03%
of
reading
+2
digits).
±200V 10
mV
±1000V
100mV
INPUT IMPEDANCE .. .. . . .. . .. .. .. . .. . .
10
MO in parallel with <100
pF,
all ranges.
NORMAL MODE REJECTION RATIO .. . >60 dB at
60
Hz
or
50
Hz.
COMMON MODE REJECTION RATIO . ..
>90
dB at
de,
50
Hz or
60
Hz
(1
kO
unbalanced)
(>120 dB available on request)
COMMON MODE VOLTAGE (MAXIMUM)
500V
de or peak ac
RESPONSE TIME TO
RATED ACCURACY 1 second maximum
MAXIMUM INPUT .. . .. . . . .. . .. . .. .. . . .. 1000V de
or
peak ac continuous (less than
10
seconds duration on
both the
200
mV
and
2V
ranges).
*DC voltages can also
be
measured using the dB mode with
.01
dB resolution between
5%
of
range and full range.
1-2

INTRODUCTION
SPECIFICATIONS
Table 1-2.
80SOA
Specifications
(cont)
AC Volts (True RMS Responding,
AC
Coupled)
VOLTAGE READOUT ACCURACY .. . .. .
±(%of
reading+
number
of
digits), between
5%
of
range and full
range.
INPUT RESOLUTION
VOLTAGE RANGE 20
Hz**
45 Hz 1 kHz 10 kHz 20 kHz 50 kHz
10
mV-
200 mV
lOµV
200mV
O.lV
· 2V lOOµV 2V
1%+10
.5%+10
1%+10
5%+30
lV
-20V 1 mV 20V I
lOV -200V
lOmV
200V '
lOOV -750V lOOmV 750V
**Typically
3 to 5 digits
of
rattle will be observed
at
full
scale
at
20
Hz.
RESOLUTION . ... . .. . .. . .. .. .. . . .. . .. . .
0.01
dB from
5%
of
scale
to
full scale;
0.1
dB from 1-5%
of
scale, 1dB
below 1
%
of
scale
VOLT -Hz PRODUCT
EXTENDED dB SENSITIVITY
10
7
max (200V
max@
50 kHz)
Typically -72 dB (6000 Ref) ±1 dB
to
10 kHz
EXTENDED FREQUENCY RESPONSE .. Typically -3 dB at 200 kHz
COMMON MODE REJECTION
RATIO
(1
kn
unbalance)
>60
dB at 50 Hz
or
60 Hz
CREST FACTOR RANGE Waveforms with a Peak/RMS ratio
of
1
:1
to
3:1
at full scale,
increasing
down
range
INPUT IMPEDANCE .. ... . .. . . .. . . •. . . .. 10 MO in parallel with
<100
pF
MAXIMUM INPUT VOLTAGE . .. . . .. . .. . 750V rms
or
1000V peak continuous (less than 10 seconds duration
on both
the
200 mV and 2V ranges),
not
to
exceed the volt-hertz
product
of
10
7
RESPONSE TIME .. . . ... . .. . . .. . . .. .. . . 2 seconds maximum
within
a range
REFERENCE IMPEDANCES . . .. .. . .. •. . Sixteen user-selectable impedance reference levels are provided
to
reference a OdBm, 1 mW level (500, 750, 930, 1100, 1250, 1350,
1son.
2son. 3000.
soon.
6000, soon, 9000, 10000. 12000),and an
80
impedance reference level is provided
to
reference a0dBWlevel.
NOTE:
On
request, the
NOT
SPECIFIED portion
of
the JOOV-750V Range can be
extended
to the Volt-Hertz product
of
1
O"!
dB Ranges
INPUT
VOLTAGE
0.77 mV -2 mV
2
mV-2V
O.lV-
2V
lV
-20V
lOV -200V
lOOV
-750V
dBm
(600!1
REF)
-60
to
-52
-52
to
+8
-18
to
+8
+2
to
+28
+22
to
+48
+42
to
+60
ACCURACY: from
5%
of
range
to full
scale,
1-year
RANGE
20Hz
45Hz
lkHz
lOkHz
20kHz
200
mV*
0.5 dBm
200
mV*
2V ±o.25dBm ±0.15 dBm
±o.25dBm
20V
'
200V
I
750V
*When
200
mV range
is
selected the 8050A autoranges
for
best accuracy
for
2V
inputs
and
less.
50 kHz
1-3