Tektronix DM505 User manual

Tektronix, Inc.
p.0. Box 500
Beaverton, Oregon 97077
COMMlTED EXCELLENCE
INSTRUCTION MANUAL
Serial Number
070-2692- 00
First Printing MAR 1979

WARRANTY
his Tektronix productis 1 ~d against defect rials and
orkmanship, under normal use, for a period of one year rrom date
f initial shipment. Tektronix will repair or replace, at its option,
bose products determined to be defective within the warranty
eriod and returned, freight prepaid, to a Tektronix Service Center.
here is no impliedwarra itness of purpoa
art numl
ive mate
nty for f
i for ierl
lease direct all I
vice or replacerr
earest Tektronix aerrlce lvertrer or Field Office; include the rypr or
Jer of th
requests
..--..I--
be.
lent par'
vright @
tents oft
. .
ct and it s serial number.
nix, Inc.
lay not b
-.
ts to the
-I --
hispublication rr e reprad vllJ
,,, ,,, without the permission of Tektronix, Inc.
Prod
cove
lucts of
red by
Tektro
U.S. an
nix, Inc
d foreis
. and its subsidiaries are
In patents and/or pending
patents.
TEKTRONIX E-MOBILE, and @ are
registered traaemar~s
or r edronix, 1
Printed in U.S.A.
privileges are reservt
nc.
3nd pril

TABLE OF CONTENTS
Page
................................................
LIST OF ILLUSTRATIONS iv
.......................................................
LISTOFTABLES V
...........................................
OPERdTORS SAFETY SUMMARY ~ii
............................................
SERVICING SAFETY SUMMARY ix
SECTION 1 SPECIFICATIOM
...........................................
Introduction 1-1
..................................
Performance Conditions 1-1
........................
Electrical Characteristics (Front Panel) 1-1
........................................
Dc Voltmeter 1-1
........................................
Ac Voltmeter 1-2
..........................................
Ohmmeter 1-3
........................................
Dc Ammeter 1-3
........................................
Ac Ammeter 1-4
......................
Electrical Characteristics (Rear Interface) 1-4
Dc Voltmeter ........................................ 1-4
........................................
Ac Voltmeter 1-5
..........................................
Ohmmeter 1-6
.........................................
Miscellaneous 1-7
..............................
Environmental Characteristics 1-7
........................................
DM 505 Only 1-7
.....................................
TM 500 Systems 1-8
..................................
Physical Characteristics 1-9
SECTION 2 OPERATING INSTRUCTIONS
...................................
lnstallation lnstructions 2-1
.................................
Controls and Connectors 2-2
.................................
Operators Familiarization 2-2
...........................
General Operating Information 2-2
....................................
l nput Connections 2-4
...................................
Sine-wave Response 2-4
...............................
Dc Voltage Measurements 2-4
..............................
Dc Current Measurements 2-4
.....................
Ac Voltage and Current Measurements
2-4
Resistance Measurements ............................... 2-4
Packaging Information ................................... 2-5

TABLE OF CONTENTS (cont)
Page
SECTION 6 OPTIONS .............................................. 61
SECTION 7 REPLACEABLE ELECTRICAL PARTS
SECTION 8
DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
Simplified Block Diagram
Rear Interface Connections
ND Block Diagram
Adjustment Locations
Troubleshooling Flow Charts
Parts Locations
Component Reference Charts
Schematics
SECTION 9
REPLACEABLE MECHANICAL PARTS AND EXPLODED VIEW
CHANGE INFORMATION
iii

Fig.
No.
Frontis
LIST OF ILLUSTRATIONS
Description
....................................
DM 505 Digital Multimeter
...............................
DM 505 Installation and Removal ............................
Front Panel Controls and Connectors ........................
Simplified Diagram of the Ohms Converter
....................................
Auto-zero timing intervars
..................................
Measurement interval timing
DM 505 Simplified Block Diagram
8-2 A/D Converter Block Diagram
8-3 Adjustment Locations
TROUBLESHOOTING FLOW CHARTS
Power Supplies
Dc Volts
Dc Current
Ohms
Ac Volts
Ac Current
Main Board (A10)
Display Board (A1 1)
Page
No.

LIST OF TABLES
Title
Page
No .
ELECTRICAL CHARACTERISTICS (Front Panel)
1-1 DcVoltmeter ................................................ 1-1
................................................. 1-2 AC Voltmeter 1-2
..................................................
1-3 Ohmmeter 1-3
ELECTRICAL CHARACTERlSTlCS (Rear Interface)
1-6 DcVoltmeter ................................................ 1-4
1-7 AcVoltmeter ................................................ 7-5
1-8 Ohmmeter .................................................. 1-6
.................................................
1-9 Miscellaneous 1-7
ENVIRONMENTAL CHARACTERISTICS
1-10 DM 505 Only ................................................ 1-7'
..............................................
1-1 1 TM500Systems 1-8
PHYSICAL CHARACTERISTICS
Physical Characteristics ........................................ 1-9
.....................................
Current Mode input Resistance 2-4
...............................
Ohmmeter Source Current and Voltage 2-5
Ohms Converter Source Current and Maximum Full-scale Voltage ............
3-2
List of Equipment Requirements .................................... 4-1
............................................
Dc Voltage Accuracy 4-3
Ac Voltage Accuracy ......................... ... ................ 4-4
................................................
Ohms Accuracy 4-6
............................................
Dc Current Accuracy 4-6
............................................
Ac Current Accuracy 4-7
Dc Voltage Accuracy for Rear l nterface ............................... 4-7
...............................
Ac Voltage Accuracy for Rear lnterface 4-8
...................................
Ohms Accuracy for Rear Interface 4-8
....................... Relative Susceptibility to Static Discharge Damage 5-2
Rear Interface Connector Assignments
Component Reference Chart @
Component Reference Chart @

OPERATORS SAFETY SUMMARY
The general safety informationinthis part of the summary isfor both operatingandservicing
personnel.
Specific warnings and cautions will be found throughout the manual where they
apply, but may not appear in this summary.
TERMS
In This Manual
CAUTION statements identify conditions or practices that could result in damage to the
equipment or other property.
WARNlNG statements identifyconditions or practices that could result in personal injury or
loss of life.
As Marked on Equipment
CAUTION indicates a personal injury hazard not immediately accessible as one reads the
marking,or a hazard to property including the equipment itself.
DANGER indicates a personal injury hazard immediate1 y accessi bleas one reads the marking.
SYMBOLS
In This Manual
This symbol indicates where applicablecautionary or other information is to be
found.
As Marked on Equipment
/j DANGER - High voltage.
@ Protective ground (earth) terminal.
ATTENTION - refer to manual.
vii

Power Source
This productisintendedtooperatein a power moduleconnected to a powersourcethat will
not
apply morethan 250 volts rms betweenthe supply conductorsor between either supply
conductor and ground. A protectivegroundconnection by way of thegroundingconductor in
the power cord is essential for safe operation.
Grounding the Product
f hisproduct is groundedthrough the grounding conductor of thepowermodulepowercord.
To avoid electrical shock, plug the power cord into a properly wired receptaclebefore
connecting to
the product input or output terminals. Upon loss of the protective-ground
connection,allaccessibleconductive
parts (includingknobsandcontrols that may appear to
be insulating), can render an electric shock.
Use the Proper Fuse
To avoidfirehazard, useonlythefusespecified in the partslistfor your product, and which is
identical
in type, voltage rating, and current rating.
Referfuse replacement
to qualified service personnel
Do Not Operate in Explosive Atmospheres
To avoidexplosion, do notoperatethis productin an atmosphereof explosivegases unless it
has been specifically certifiedfor such operation.
De Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels. Do not operate the
product without
the covers and panels properly installed.
Do Not Operate Without Covers
To avoidpersonalinjury, do not operate this pr~ductwithout covers orpanelsinstalled. Do not
apply powerto the plug-in via a plug-in extender.
viii

SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary.
Do Not Service Alone
Do not performinternalserviceor adjustment of this productunless another personcapable of
rendering first aid and resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product. To avoid personal injury, do not
touch exposed connections and componentswhile power is on.
Disconnect power before removing protective panels, soldering, or replacing corn ponents.
Power Source
This product is intendedto operate in a power module connected to a power source that will
not apply more than 250 volts rms between the supply conductors or between either supply
conductor
and ground. A protectivegroundconnection by way of the grounding conductor in
the power cord is essential for safe operation.

Section 1-DM 505
SPECIFICATION
Introduction
The DM 505 Digital M ultimetermeasures resistance, dc
or
ac voltage, and dc or ac current. The AC functions
respond
to the average value of an ac current or voltage
and the readout displays the sinusoidal rmsvalue. Inthe
resistance
mode of operation, the HI n-LO fi pushbut-
ton selects either
of two full-scale probe tip voltages.
The front panel pushbuttons select thefunctions and
ranges. The INPUT pushbutton selects front panel con-
nector input ( EXT) for current, voltage and resistance
measurements,or
rear interface connector input (INT)for
voltage
and resistance measurements. The readout is a
3 1/2 digitdisplay using seven-segment LED. The decimal
point is automaticaSly positioned by the range pushbut-
tons. The polarlty signs for dc voltage and dc current
measurements are
also displayedautomatically. A blink-
ing display indicates overrange except on the 1000 Y dc
and 500 Y ac ranges. The reading rate IS approximately
three readings per second.
Performance Conditlons
The electrical characteristics are valid only if the
DM 505 has been calibrated at an ambient temperature
between
+21°C and i-25" C and isoperating at anambient
temperature between
O0 C and 4-50" C, unless otherwise
noted.
Items listed in the Performance Requirements column
of the ElectricalCharacteristicsareverif led by completing
the Performance
Check in this manual. Itemslistedinthe
Supplemental Information column are not verified inthis
manual.
They areeitherexplanatory notesor performance
characterist~csfor which no limits are specified.
ELECTRICAL CHARACTERlSTlCS
Front Panel
Table 1-1
0C VOLTMETER
Supplemental information
Characteristics
Accuracy for the 200 mV, 2 V,
20 V, 200 V, and 1000 V ranges:
+I 8" C to +28" C
200 mV to 200 V ranges
1000 Y range
Performance Requirements
+(O.l% of reading + 0.05°h of full scale)
f (0.1% of reading + O.T% of full scale)
O°C to +18"C, +28"C to +50°C
200 mV to 200 V ranges
1006 V range
Common
Mode Rejection
Normal Mode Rejection Ratio
Maximum Resolution
ResponseTime
Input Resistance
it(0.2% of reading + 0.1 % of full scale)
f (0.2% of reading f 0.2% of full scale)
3100 dB at dc.
280 dB at 50 to 60 Hz.
350 dB at 50 and 60 Hz k0.2 Hz.
Verified with 1 kR unbalance at
the
LOW terminal.
(Clock frequency:
20.48 kHz tl%.)
1 00 pV
<0.5 second to rated accuracy.
f 0 Mfl f 0.5%.

Table 1-1 (cont)
Table 1-2
AC VOLTMETER
Characteristics
Maximum lnput Voltage
VOLTS/R to LOW
1-2
REV A OCT 1979
Performance Requirements Supplemental Information
1000 V peak.
VOLTS/R toGround
LOW to Ground
Supplemental Information
Charaderlstics
Accuracy for the 200 mV, 2 V,
20 V, 200 V and 500 V ranges:
+lBO C to +28' C
200 mV to 200 V ranges
45 Hz-10 kHz sine wave
25-45 Hz, 10-20 kHz sine wave
1000 V peak.
1000 V peak.
Performance Requirements
f (0.5% of reading + 0.1 % of full scale)
f (1% reading + 0.1% of full scale)
500 V range
25 Hz-10 kHz sine wave f (1% of reading 1- 0.4% of full scale)
0° C to +18" C, +28" C to 4-50" C
200 mV to 200 V ranges
45 Hz-10 kHz sine wave &(I% of reading + 0.15% of full scale)
25-45 Hz, 1G20 kHz sine wave f (1.5% of reading + 0.15% of full scale)
500 V range
25 Hz-10 kHz sine wave
Common Mode Rejection Ratio
Maximum Resolution
Response Time
f (1.5% of reading +0.6Oh of full scale)
250 dB at 50 to 60 Hz.
Verified with 1 kR unbalance at
the LOW connector.
100 pV.
<1.5 seconds, within specified
accuracy on measurements within
any one range.
Input Impedance
Maximum lnput Voltage
VOLTS/R to LOW
10 MR +0.50J0 paraHeled by less than
130 pF.
566Y ac rms or600Vdc, nottoexceed
1000 Y peak.
VOLTS/fl to Ground
LOW to Ground
500 V ac rms or 600 Vdc, not to exceed
1000 V peak.
500V
ac rms or 600 Vdc, not to exceed
1000 V peak.
Maximum Volt-Hz Product
107 VaHz.

Table f -3
OHMMETER
f f 8°C to +2a°C
200 R range
200 R range
pproximatel y f 6 V.
Table 1-4
PC AMMETER
CharaeZerEstlcs
Accuracy for the 200 PA, 2 rnA,
20 mA, 200 rnA and 2000 mA ranges:
+lg°C to +2g°C
0°Cto+180C,+z80Cto+~~0C
Response Time
Maximum Open Circuit Input
Voltage
mA to LOW
Performance Requirements
f (0.3% of reading + 0.05% of full scale)
f(O.4Y0ofreading+O.l%offullscale)
Supplemental Information
<0.5 second.
250 V peak.

TaMe 1-4 (cont)
Characteristics
Maximum Floating Voltage
mA to Ground
Low to Ground
Table 1-5
1000 V peak.
1000 Y peak.
Maximum Resolution
kC AMMETER
Performance Requirements
0.1 PA.
Accuracy for the 200 PA, 2 mA,
20 mA, 200 mA, and 2000 rnA ranges:
45 Hz to 10 kHz
Response f ime
Maximum Open Circuit Input
Voltage
Maximum Floating Voltage
Supplemental Information
ELECTRICAL CHARACTERISTICS
Rear Interface
fable 1-6
DC VOLTMETER
Characteristics Performance Requirements Supplemental 1nformatlon
Accuracy for the 200 mV, 2 V, 20 V,
200 V and 1000 V ranges:
200 mV to 200 V ranges
1000
V range
f (Q.tYo of reading + 0.05% of full scale)
f (0.1% of reading + 0.1% of full scale)

Table 1-6 (cont)
Supplemental Information
200 mV to 200 V ranges
1000 V range
f (0.2% of reading 4- 0.1% of full scale)
f 10.2% of reading t 0.2% ot full scale)
Maximum Resolution
--
Response Ti rn e
lnput Resistance
<0.5 second to rated accuracy.
Maximum lnput Voltage
Pin 28B to Pin 28A
200 V peak.
Pin 28B to Ground
200 V peak.
Pin 28A to Ground
200 V peak.
Table 1-7
AC VOLTMETER
Performance Requirements Supplemental Imformation Charaderisttics
Accuracy for the 200 mV, 2 V, 20 V,
200 V and 500 V ranges:
200 mV to 2 V ranges
45 Hz-10 kHz sine wave f(0.5% of reading f O.lP/o of full scale)
25-45 HZ, 110-20 kHz
sine wave
20 V to 200 V ranges
25 Hz-20 kHz sine wave
f (I0h of reading + 0.1% of full scale)
+(lO/o of reading + 0.I0/o of full scale)
500 V range (max. input: 200 V)
25 Hz-10 kHz sine wave
f (1% of reading -t 0.4O/o of full scale)
200 mV to 2 V ranges
45 Hz-10 kHz sine wave
25-45 Hz, 10-20 kHz
sine wave
20 V to 200 V range
f (1% of reading + 0.15% of full scale)
f (1.5% of reading + 0.15°h of full scale)
25 Hz-20 kHz sine wave
f (1.5% of reading + 0.1 Soh of full scale)
500 Y range (max. input: 200 V)
.
f (1 -5% of reading + 0.6% of full scale)
25 Hz-10 kHz sine wave

Table 1-7 (cont)
Table 1-8
OHMMETER
+lB°C to +28OC
200 !J range
200 fl range
reading $ 0.15% of full scale
Supplemental Infwrnation
I00 pV
<I .5 seconds, within specified
accuracy on measurements within
any one range.
200 V peak.
200 V peak.
200 Y peak.
Characteristics
Maximum Resolution
Response Time
Maximum l nput voltage
Pin 288 to Pin 2814
Pin 288 to Ground
Pin 28A to Ground
Maximum Volt-Hz Product lo7 V~HZ.
Performance Requirements

Table 1-9
MISCELLANEOUS
ENVIRONMENTAL CHARACTERISTICS
Table 1-10
DM 505 ONLY"
Operating
Operating
i-30°C and +50°C at 90%, 1-5 -O%I~
-T-28800B, class 5 with
Operating
0.64 mrn (0.025") disp., 5-55-5 H?
Test to MIL-t-28&00B, class 3.
(sine wave) 75 min. total.
Non-operating
50 g (1/2 sine) 11 ms*
Test to MIL-T-288OOB, class 3.
Operating
45O or 4" or equilibrurn,"'
Test to M l t-T-28800B, class 3.
Supplemental lnformatlon
Approximately 8 W.
Characteristics
Power Consumption
Performance Requlrements
Reading Rate
Over-range
Cali
bration Interval
Warm-up Tirna
3 per second.
Flashingdisplay (except 1000 V dcand
500
Y ac ranges).
fOOQ hours or six months, whichever
occurs first.
30
minutes (60minutesaFterstorage in
high humidity environment).

Table 1-10 (cont)
'See Table 1-11 for system envfronmentalcharacterlstlcs.
Characteristics
E.M.C.
Operating
Electrical Discharge
Operating
Transportation
with power module.
Description
30 Hz to 1 GHZ~
Test to MI L-T-288008, class 3.
20 kV rna~.~
Charge applied to each protruding area of
the product under test except the input
terminals.
Qualified under National Safe Transit
Association Preshipment Test Procedures,
Project
1 A-B-1 and Project t A-B-2.
'without power module.
d~ernperature: Durlng $ow temperature test MIL-T-28800B, paragraph 4.5.5.1.3(b) for dass 5, steps 4 and 5 shall be per-
formed before step 2, Also, the instrumentshall not be operating durhg step 6, paragraph 4.5.51.3(e), class 5.
Whlle aperating, condensed molsture shall not be present on class 5 Instruments. Drying of the instrument
for thFs class may be performed in a suitable chamber, if necessary.
CHumldlty: The 20 V ac and 200 Y ac ranges shall be derated to f 25% of readlng +2 counts. Note: All performance
requirements are met while operating at w95% relativehumldlty at f 30°C and f 50°C with on hour wnrmup.
Table 1-11
TM 500 SYSTEMS
I
Characteristics
Temperature
TM 501 TM 503 TM 504 TM 506 TM 515
Operating
Non-operating
Meets
same test standards as plug-in.
Meets
same test standards as plug-in.
Humidity
Operating Meets same Zest standards
as plug-in.
Non-operating
Altitude
Meets
same test standards as plug-in.
Operating Meets
same test standards as plug-in.
Non-operating
I Meets same test standards as plug-in.