Tektronix DM 502A User manual

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7~I~ronoc
INSTRUCTION
MANUAL
Tektronix, Inc .
P .O . Box 500
Beaverton,
Oregon

97077

Serial
Number
COMMITTED TO EXCELLENCE
.

D
IVI 50 A
AUTORANGING
DIGITAL
MULTIMETER
070-2693-00

First Printing
FEB 1979

WARRANTY
Tektronix
warrants to the original purchaser
that this product is
free
from defects in materials
and workmanship, under
normal
use, for a period of one
(1) year from the date of
shipment .
Tektronix will, at its
option, repair or replace
the product if
Tektronix determines
it is defective within the
warranty period,
and it is returned,
freight prepaid, to a
Tektronix Service Center .
There is no
implied warranty of
fitness for a particular purpose
.
Tektronix is not liable for
consequential damages .
Es gibt
keine Garantie, da(3 sich das Gerat fair
einen ganz
bestimmten
Zweck eignet . Tektronix kann nicht haftbar
gemacht werden fair
Folgeschaden .
Copyright ` 1979 by
Tektronix, Inc . Atl rights
reserved . Contents
of this
publication may not be reproduced
in anyform without the

Copyright

© 1979 durch
Tektronix, Inc . Alle
permission of
Tektronix, Inc .

Rechte vorbehalten . Der Inhalt dieser
Publika-
tion dart ohne
Genehmigung von Tektronix, Inc .
Products
of Tektronix, Inc . and its
subsidiaries are covered by

nicht wiedergegeben werden
.
U .S .
and foreign patents and/or
pending patents .
Produkte
von Tektronix, Inc . and semen Tochter-
TEKTRONIX, TEK,
SCOPE-MOBILE, and

are
registered

gesellschaften sind
durch US- and Auslands-
trademarks of
Tektronix, Inc .

patente and/oder schwebenden
Patente abge-
deckt .
Printed in U .S .A
. Specification and price
change privileges are
reserved
.
GARANTIE
Les appareils TEKTRONIX,
en condition normale
d'utilisation
sont garantis ~ I'acheteur
d'origine contre tout
defaut de matiere
Les appareils TEKTRONIX,
en condition normale
d'utilisation,
sont garantis ~ I'acheteur
d'origine contre tout defaut
de matiere
ou vice de fabrication, pour une
duree dune annee, e
compter du
jour de livraison .
Durant cette periode, les
pieces defectueuses
sont remplacees,
TEKTRONIX se reservant la
decision de proce-
der snit e la reparation
soar au remplacement
du product . En cas
de retour du materiel
e un centre Tektronix, le
transport alter est
e la charge du client
.

'
II n'y a
pasdegarantie implicate
de ('adaptation e une
application
particuliere . Tektronix nest pas
responsable des dommages
rgsul-
tants .
Copyright
J
1979
TEKTRONIX INC . Tous
droits
reserves . Le contenu
de ce manuel ne peut
etre re-
produit sous
quelque forme que ce soar sans
('accord
de Tektronix
Inc
.
Tous les produits
TEKTRONIX INC sont
brevetes
US et etranger et les
logotypes TEKTRONI
X, TEK,
SCOPE MOBILE, ~
sontdeposes .
Imprime aux U .S .A .
TEKTRONI X se .reserve
le droit
de modifier
caracteristiques et prix dans
le cadre de
developpements
technologiques .
GARANTIE
Tektronix gibt dem Kaufer auf dieses Gerat,
daf3 sich in ein-
wandfreiem
Zustand befindet, eine einjahrige Garantie bei
sachgemaf3er
Behandlung . Die Garantiezeit beginnt mat dem
Tag der Verschiffung . Tektronix
repariert oder ersetzt dieses
Ger~t, wenn eine einwandfreie
Fehlerbestimmung durch
Tektronix
innerhalb der Garantiezeit vorliegt and es frachtfrei
an das n~chste
Tektronix-Service-Centergeschickt ward .
TEKTRONIX, TEK, SCOPE-MOBILE and r~` ; sind
geschiitzte
Warenzeichen von Tektronix, Inc .
Gedruckt
in U .S .A . Spezifikations- and Preis-
anderungen
bleiben vorbehalten .

Section 2

OPERATING
INSTRUCTIONS
English
Version
REV
A OCT 1979
TABLE OF
CONTENTS
Section 1

SPECIFICATION . . .......... ~-
Instrument
Description ........
1-1
Accessories ...... . . ........
1-1
Performance
Conditions .......
1-1
Electrical
Characteristics . ......
1-1
Environmental Characteristics
... 1-8
TM 500 Systems
Environmental
Specifications
......... . .... 1-9
Physical
Characteristics ... ... .
1-9
Installation
and Removal . ......
2-1
Controls, Connectors,
and
Indicators ........... . .... .
2-2
Input
Connections ...........
2-4
Making Measurements ........
2-4
DC
Voltage
Measurements .....
2-4
AC Voltage
Measurements .....
2-4
Decibel Measurements
........ 2-4
Resistance
Measurements ......
2-4
Current
Measurements ........
2-4
Temperature Measurements
.... 2-5
Repackaging
Information . . ....
2-5
German Version
Kapitel2 BEDIENUNGSEINFIJHRUNG
Page

Page
LIST OF
ILLUSTRATIONS

........... . ....

iv

French Version
LIST OF TABLES ...... . . ...........~ ~ ~ ~

v

UTILISATION-FRANCAIS
OPERATOR
SAFETY SUMMARY
.......... . .

vii

Chapitre 2

INSTRUCTIONS D'UTILISATION
SERVICE SAFETY
SUMMARY . . . .......... .

ix
Description de I'appareil

... . . . . .

2-1
Accessoires .......... . . . .....

2-1
Conditions de verification
des perfor-
mances ...........
. . ... 2-1
Instructions
d'installation

......

2-1
Commandes,
bornes d'entrees et
voyants lumineux

..........

2-2
Connexions d'entree

.........

2-2
Realisation des
mesures

........

2-4
Mesures de tension
continue ......

2-4
Mesures de
tension alternative

...

2~
Mesures de
niveaux (decibels)

...

2-4
Mesures de
resistance

..........

2-5
Mesures de
courant

............

2-5
Mesures de
temperature

........

2-5
Instructions de reemballage pour
expedition .... . . . . ... . . . . .
2-5
Einbau-Anleitung .............. .

2-1
Vorbereitung fur
Gebrauch . . . . . .

2-1
Verpackungshinweise ......... .

2-2
Bedienungselemente
and Anschlusse

2-2
Bedienungsanleitung . . ......... .

2-3
Allgemeine
Bedienungsinformation

2-3
Ausgangsverbindungen . . . .....

2-4
Frequenzwahl . ............ . . .

2-6
Ausgangspegelwahl . . . . . . . . . . . 2-6
Intermodulation Test-Signal . . . . .

2-6
Ruckseitige Interface-Signale . . . .

2-7

DM 502A
TABLE
OF
CONTENTS
(cont)
Japanese
Version
Page
Aiz #7Sc a3t aA
~ 2 ~

A~#Tcii3~eA
1~Z'If .~ ~ U )~Z
f#
~"
L
~
;~~
...........
. . ............ .2 - ~
aiha-J~,a~7~~~U~i
h--`x
. . .2_2
J~~ ~ o~#~i'~~
....... . .............. . . .
. .............. .2-q
# ~~A3~eA~
......... . .
. ................ . . ..............
. . .2-q
o c
~r
;®iJ~ .... . ................ . . .............. .. ..
.2_q
AC '~~~®~1 :~-
. .
.............. . . ................ . . ....
.2 _ q
.-T
i^JVi®ilk
. .............. . . ..............
. . .. ...... .2_q
#FE#ni®il~~
. . . ............... . ...............
. . .......... .2_q
~ :®i
.~,
. ................ .
. .............. .. ............
.2 _ q
,~tRi®il,~
.......... ........ . .
.2-5
~~'z~>~~
.......... . . .................. ................
.2-5
WARNING
THE FOLLOWING
SERVICING INSTRUCTIONS ARE
FOR USE
BYQUALIFIED PERSONNEL ONLY
. T O AVOID
PERSONAL INJURY . D ONOT
PERFORM ANY SER-
VICING OTHER THAN
THAT CONTAINED IN
OPERA-
TING
INSTRUCTIONS UNLESSVOUARE
QUALIFIED
TO
DO SO .
Section 4

CALIBRATION
... ........... 4-1
Performance Check ..........
4-1
Introduction . . . . ..........
4-1
Test Equipment
Required .... 4-1
Rear Interface
Accuracy Checks 4-10
Adjustment
Procedure ........ 4-11
Introduction .... . . ........ 4-12
Calibration
Interval ... ...... 4-12
Services Available ... ...... 4-12
Test Equipment Required ....
4-12
Preparation ........ . . ....
4-12
Section s

MAINTENANCE ....... . . .... 5-1
Preventive Maintenance .......
5-1
Corrective
Maintenance ... . ... 5-1
Circuit Board Removal .... . ...
5-1
Heat Sink Removal and
Replacement ...............
5-1
Obtaining
Replacement Parts . . . 5-1
Ordering
Parts ........... . . . 5-1
Troubleshooting Aids .........
5-1
Static-Sensitive
Components . . . . 5-1
Test
Equipment . .......... . . 5-2
Section 6

OPTIONS ... . . . . ..........
6-1
Standard
Instrument . ........ . 6-1
Section 3

THEORY
OF OPERATION ..... 3-1

Option 2 Instrument ..........
6-1
Introduction .............. . .
3-1
Voltage
and dB Input Circuitry
. .

3-1

Section 7

REPLACEABLE
ELECTRICAL
PARTS ......... . . ........
7-1
Ohms Converter .............
3-1
Temperature Measurement

Section 8

DIAGRAMS
AND ILLUSTRATIONS
Circuitry ... ... ............
3-1

Troubleshooting Flowcharts
Current
Measurement Circuitry . . 3-3

Schematic Diagrams
Analog-to-Digital Converter .....

3-3

Parts Location Grids
and Reference
Auto Zero Interval

. . .........

3-3

Tables
Measurement
Interval . . .......
3-3
Decimal Point Logic ..
. . ..,,,,
3_5

Section 9

REPLACEABLE
MECHANICAL
PARTS
...................
9-1
Auto
Ranging Circuitry . . . . ....
3-6
Exploded View
Relay Switching Circuitry
. . .... 3-6

Accessories
dB Offset Current Source
... ... 3-7
Power
Supplies ......... . ...
3-7

CHANGE INFORMATION
REV
A OCT 1979

2-1

Installation and
Removal ...................... . . .... .......

2-1
2-2

Front Panel Controls and Connectors ............ . . .... . ..... .

2-3
3-1

Auto Zero
and Measurement Interval
Timing Sequences
.... ..:. : ..............:. ..... . . . . .... .

3-4
3-2

Data Output Format From U1311 for a Display of 1492 . . .... .......

3-5
8-1

DM 502A Block Diagram
8-2

Analog-to-Digital Block Diagram
8-3

Adjustment Locations
(Main Board)
8-4

Adjustment
Locations (Analog Board)
Troubleshooting Flowcharts
8-5

Power Supply
8-6

DC Volts
&7

DC
Current
8-8

Ohms
8-9

AC
Volts
8-10

AC Current
8-11

Decibels (dB)
8-12 Temperature
8-13

Auto Range
Parts Location
Grids
8-14

Analog Board
{A13)
8-15

Main Board (A15)
8-16

Display Board
(A11)
LIST OF
ILLUSTRATIONS
REVA OCT 1979

iii

DM 502A
IV
LIST OF TABLES
1-1

DC VOLTMETER ..............
............. .... . . .......

1-1
1-2

AC VOLTMETER
(TRUE
RMS) ...... ...

...... .............

1-2
1-3

DECIBELS (dB)-TRUE
RMS ....... . .

........ ... . . .......

1-3
1-4

OHMMETER ........................ ...... . . . . . . ....... 1-5
1-5

DC
AMMETER .....

............ . .

. .

. .

....... . . . .

1-6
1-6

AC AMMETER ........................ ..............
. . . .

1-6
1-7

TEMPERATURE ....................

. .

... . ..... . .
..
. .

1-7
1-8

MISCELLANEOUS ..................... .............. . . . .
1-7
1-9

ENVIRONMENTAL CHARACTERISTICS .... ............... . . . .

1-8
1-10

TM 500 SYSTEM ENVIRONMENTAL SPECIFICATIONS ........ . . . .

1-9
1-11

PHYSICAL CHARACTERISTICS

......... .....

......... . . .

1-9
3-1

RELAY AND ATTENUATOR (01472) LOGIC . . ......

...........

3-2
4-1

TEST EQUIPMENT ..................... ..................

4-1
4-2

FRONT PANEL DC
VOLTAGE LIMITS ........ .................

4-3
4-3

FRONT PANEL AC VOLTAGE LIMITS ......... ................

4-4
4-4

FRONT PANEL dB LIMITS ................. ................

4-5
4-5

FRONT PANEL RESISTANCE LIMITS ......... ................

4-6
4-6

FRONT PANEL DC CURRENT LIMITS ......... ................

4-7
4-7

FRONT PANEL AC CURRENT LIMITS ......... ................

4-8
4-8

FRONT PANEL TEMPERATURE LIMITS ....

... ...............

4-9
4-9

REAR
INTERFACE DC LIMITS ............... . .

...........

4-10
4-10

REAR INTERFACE AC LIMITS .............. ................

4-11
4-11

REAR INTERFACE RESISTANCE LIMITS ........ .....,.........

4-11
5-1

RELATIVE SUSCEPTIBILITY TO
STATIC DISCHARGE DAMAGE .....

5-2
8-1

REAR INTERFACE CONNECTOR
ASSIGNMENTS
COMPONENT
REFERENCE CHARTS
8-2

INPUT
CIRCUITRY

1O
8-3

A/D CONVERTER, dBSCALING,
PWR SUPPLY
8-4

DISPLAY 8~ LOGIC
CIRCUITRY O3
8-5

RANGE LOGIC

4O
REV A OCT 1979

The general safety information in this part of
the summary is for both operating and servicing personnel .
Specific warnings
and cautions will be found throughout the manual where they apply,
but may not
appear
in this summary .
In This Manual
OPERATORS SAFETY SUMMARY
CAUTION statements identify conditions or practices
that could result in damage to the equipment or
other property .
WARNING statements identify
conditions 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 immediately accessible as one
reads the marking .
In This Manual
Q This symbol indicates where applicable
cautionary or other information is to be found .
As Marked on Equipment
DANGER - High voltage .
Protective ground (earth) terminal
.
ATTENTION - refer to manual .
Power Source
TERMS
SYMBOLS
This product is intended to 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 protective ground connection by way of the grounding conductor in the power cord is essential for safe
operation .

Grounding the Product
When installed in the power module, this product is grounded through the grounding conductor of the
power cord . To avoid electrical shock, plug the power cord into a properly wired receptacle before
connecting to the product input or output
terminals . Upon loss of the protective ground connection, all
accessible
conductive parts (including knobs and controls that may appear to be insulating) can render
an electric shock .
Use the Proper Fuse
To avoid fire hazard, use
only the
fuse
specified in the parts list for your product, and which is identical in
type,
voltage
rating, and current rating .
Refer fuse replacement to qualified service
personnel .
Do Not Operate In Explosive Atmospheres
To
avoid explosion, do not operate this product in an atmosphere of explosive gases unless it has been
specifically certified for such operation .
Do 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 avoid personal injury, do not
operate this product without covers or panels installed . Do not apply
power
to
the plug-in via a plug-in extender .

Do Not Service Alone
SERVICING SAFETY SUMMARY
FOR QUALI FIED SERVICE PERSONNELONL Y
Refer also to the preceding Operators Safety Summary
.
Do not perform internal service or adjustment of this product unless another person capable of rendering
first aid and resuscitation is present .
Use Care When
Servicing With Power
On
Dangerous voltages exist at several poi nts i n this product . To avoid personal i nj ury, do not touch exposed
connections and components while power is on .
Disconnect power before removing protective panels, soldering, or replacing components .
Power Source
This product is intended to operate
from
a power source
that will not
apply more
than
250 volts rms
between the supply conductors or between either supply conductor and ground . A protective ground
connection by way of the grounding conductor in the power cord is essential for safe operation .

DM 502A Autoranging
Digital Multimeter .

SPECIFICATION
Instrument Description

Accessories
The DM 502A Digital Multimeter measuresdo and ac

Standard accessoriesincludethisinstructionmanual,a
voltage and current, dBm, dBV, resistance, and tem-

set of test leads, and
the TEKTRONIX P6601 temperature
perature . The ac functions are true rms responding . The

probe . The P6601 temperature probe and temperature
ranges for do voltage, ac voltage, dBm, dBV, and

measurement capabilities are deleted for Option 2 in
resistance are automatically or manually selected as

struments .
desired . The current and temperature ranges are manually
selected .
Rear interface connector input is pushbutton selected
from the front panel . Readout in dBm or dBV is chosen by
an internal jumper .
The unit
is
shipped with the internal
jumper in the dBm position .
Items listed in the Performance Requirements column
of the Electrical Characteristics are
verified
by com
pleti ng
the Performance Check in the Calibration section of this
The readout is a 31/2 digit display using seven

manual . Items listed in the Supplemental Information
segment LED . The decimal point is automatically

column are not verified in this manual
.
They are either
positioned depending on the operating range of the

explanatory notes or performance
characteristics for
instrument . Polarity indication is
automatic
.

which
no
limits are specified .
Accuracy for 200 mV, 2 V, 20 V, 200 V,
and 1000 V ranges (Front Panel and
Rear Interface)
+18° C to +28° C
200 mV to 200 V ranges
1000 V range
0° C to +18° C, +28° C to +50° C
200 mV
to 200
V ranges
1000 V range
Common Mode Rejection Ratio
Normal Mode Rejection Ratio
Performance
Conditions
ELECTRICAL CHARACTERISTICS
Table 1-1
DC VOLTMETER
Section 1-DM 502A
The electrical characteristics are valid only if the
DM 502A has been calibrated at an ambient temperature
between +21 ° C and +25° C and is
operating at an ambient
temperature between 0° C and +50° C .
Characteristics

~

Performance Requirements

~

Supplemental Information
f(0 .1% of reading + 0 .05% of full scale)
f(0
.2% of reading
+
0 .1% of full scale)
t(0 .2%
of
reading + 0 .2%
of
full
scale)
,100dB at dc .
~80dBat50to60Hzt0 .2Hz .
,50 dB at 50 or 60 Hz f0 .2 Hz .
Automatic or manual ranging .
f(0 .1% of reading + 0 .1% of full scale)

Maximum input for
rear interface
is 200 V peak .
Maximum input for rear interface
is 200 V peak .
Verified with a 1 kf2 unbalance in
series with LOW terminal . (I nternal
clock frequency mustbe
20 .48
kHz
t1% .)
(Internal clock
frequency mustbe
20 .48 kHz f1% .)

Specification-DM 502A
Maximum Resolution

~

~
100
Step Response, Time

<1 second within any range .
Add 1 .5 seconds for each range
change in
the AUTO mode .
Input Resistance

10 Mn t0 .5% .
Input
Terminals

Front panel (EXT) or rear
inter-
face (INT)
. Switch selectable .
Maximum Input Voltage
Front Panel Terminals
VOLTS/n to
LOW

1000 V peak .
VOLTS/f2 to Ground

1000 V peak .
LOW to ground

1000 V peak .
Rear Interface
Terminals
Pin
28B
to
Pin 28A

200 V peak .
Pin 28B to Ground

200
V peak .
Pin 28A to Ground

200 V peak .
Table 1-2
Characteristics

~

Performance Req uirements
Accuracy for 200mV, 2 V, 20 V, 200 V,

I

Automatic or manual ranging .
and 500 V ranges :
Front Panel
+18° C to
+28° C
200 mV to 200 V ranges
20 Hz to 40 Hz
40 Hz to 20 kHz
500
V range'
20 Hz to 40 Hz
40 Hz to
20 kHz
0° C to +18° C, +28° C to +50° C
200 mV to 200 V ranges
20 Hzto40Hz
40 Hz to 20
kHz
500 V range
20 Hz to 40 Hz
40 Hz to
20 kHz
Rear interface
Table 1-1 (cont)
Characteristics

~

Performance Requirements

~

Supplemental
Information
AC VOLTMETER (TRUE RMS)
t(1 .5°k
of
reading + 0 .3% of full scale)
f(0 .6% of reading + 0 .3% of full scale)
t(1.5% of reading + 1 .2% of full scale)
f(0 .6% of reading + 1 .2% of full scale)
f(1.8%
of
reading + 0 .35°k of full scale)
f(0 .8% of reading + 0 .35% of full scale)
t(1.8% of reading + 1 .4% of full scale)
t(0 .8°k of reading + 1 .4°~ of full scale)
Supplemen tal Information
Increase above percent of reading
tol-

Maximum rear interaace input is
erances by 0 .5°~
.

200 V peak .

Specification-DM
502A
Table 1- 2 (coM)
Characteristics

Performance Requirements

Supplemental Information
Usable from 20 kHz to 100 kHz
200 mV to 200 V ranges

I

I

Typically St(5% of reading
+ 0 .3% cff full scale) .
500
V range

I

Typically ,+(5°k of reading
+ 1 .2% of full scale) .
Common Mode Rejection
Ratio

I

,60 dB at 60 Hz

I

Verified with 1 kf2 unbalance in
series with the LOW terminal .
Maximum Resolution

I

~

100 pV .
Response
Time

<1 second within any
range .
Add
1
.5
seconds for each range
change in the AUTO mode .
Input
Impedance

I

10
MII
f0 .5%
paralleled by
<60
pF
.
Input Terminals

I

Front panel (EXT) or rear inter-
face (INT) Switch selectable . .
Maximum Input Voltage
Front Panel Terminals
VOLTS/f2 to
LOW

~

~

500 Vrms, not to exceed
1 kV peak .
VOLTS/A to Ground

~

~

500 Vrms,
not to exceed 1 kV peak .
LOW
to
Ground

~

~

500 Vrms,
nottoexceed 1 kV peak .
Rear Interface Terminals
Pin 28B to
Pin 28A

~

~

Not to exceed 200 V peak
.
Pin 28B to Ground

~

~

Not
to
exceed 200 V peak .
Pin 28A to Ground

~

~

Not to exceed 200 V peak .
Crest Factor

4 at full scale on all ranges
except 500 V, 52 on 500
V
range .
Characteristics
Accuracy for -10 dB, +10 dB, +30 dB,
and +50 dB ranges (Front Panel and
Rear Interface)
+18° C to +28° C
Table 1-3
DECIBELS (dB)-TRUE
RMS
Performance Requirements
f0 .5 dB from +50 dB
to -50
dB
from
20 Hz to 20 kHz .
t0 .5 dB from -50 dB to -60 dB from
20 Hz to 2 kHz .
f1 .5 dB from -50 dB to -60 dB from
2 kHz
to 20
kHz .
Supplemental Information
Automatic
or manual ranging .
Front panel shows
maximum
range value with 40 dB
below dynamic range .

Specification-DM
502A
Maximum Resolution

~

I 0 .1 dB .
Response Time

<1 second
within any range .
Add 1 .5 seconds for each range
change in the AUTO mode .
Input Impedance

10 MS2 f0 .5% paralleled by
<60 pF .
Input Terminals

Front panel (EXT) or rear inter-
face (INT) . Switch selectable .
Maximum Input Voltage
Front Panel Terminals
Table 1-3 (cont)
Characteristics

~

Performance Requirements

~

Supplemental Information
0°C to +18°C, +28°C to +50°C

f1 .1 dB from +50 dB to -50 dB from
20 Hz to 20 kHz .
t1 .1 dB from -50 dB to -60
dB from
20 Hz to
2 kHz .
f2 .1 dB from -50 dB to -60 dB from
2 kHz to 20 kHz .
VOLTS/i2 to LOW

~

~

500Vrms, not to exceed 1 kV peak .
VOLTS/S2 to Ground

~

~

500Vrms,nottoexceedlkVpeak .
LOW to Ground

~

~

500 Vrms, not to exceed
1 kV peak .
Rear Interface Terminals
Pin 28B to Pin
28A

~

~

Not
to
exceed 200 V peak .
Pin 288 to
Ground

~

~

Not to exceed 200 V peak .
Pin 28A to Ground

~

~

Not to exceed 200
V peak .
Crest Factor

4 at full scale except ~2 above
40 dB .
Reference Voltage
dBm

0
.7746 V (1 mW dissipated in
600 S2) .
Noise Level

~

~

Typically below -75 dB .

Accuracy
for 200 f2, 2 kf2, 20 kf2,
200
kf2, 2000 kf2, and 20 Mfg ranges .
Response Time
Input
Terminals
Maximum Input Volts
Measuring
Current and Full
Scale Volts
Maximum Resolution
Maximum Open Circuit
Voltage
Characteristics
+18° C to +28° C
200
f2
to
2000 kf2 ranges
20 Mfg range
0° C to +18°
C, +28° C to +50° C
200 f2 to 2000 kf2 ranges
20
Mfg range
Rear Interface
Table 1-4
OHMMETER
Performance Requirements

~

Supplemental
Information
f(0 .5% of
reading + 0 .05% of full scale
+ 0 .2 fl) .
t(1% of reading
+
0 .05% of
full scale) .
t(0 .8%
of reading + 0 .1% of full scale
+ 0 .2 f2) .
f(1 .3% of reading
+ 0 .1% of full scale) .
Add 0 .5 fl to the front-panel accuracies
stated for the 200 f2 to 2000 kfl ranges .
Specification-DM 502A
Automatic or
manual ranging .
<1 second within any range .
Add 1 .5 seconds for each range
change in the AUTO mode .
Front panel (EXT) or rear inter-
face
(INT) . Switch selectable .
130 Vdc or ac rms indefinitely .
230 Vdc or ac rms for 1/2 hour
(200 V peak at rear interface) .
Full
HI-OHMS Scale
Range Current Voltage
200
f2

1 mA

0 .2 V
2 kf2

1 mA

2 .0 V
20 kf2

.1 mA

2 .0 V
200 kf2

10 NA

2 .0 V
2000 kf2

1 NA

2 .0 V
20Mf2

.1 NA

2 .OV
Full
LO-OHMS Scale
Range Current Voltage
200 f2

1 mA

0 .2 V
2 kf2

.1 mA

0 .2 V
20
kf2

10 NA

0 .2 V
200
kf2

1 NA

0 .2 V
2000 kf2

.1 ,tcA

0 .2 V
20 Mfg

.1 uA

2 .0 V
100mfg
.
14 V .

Specification-DM 502A
Accuracy for
200pA, 2 mA, 20 mA,

I

Manual ranging
only .
200 mA
and 2000 mA ranges :
Front Panel only
+18°C to
+28°C

f(0 .2% of reading + 0 .05% of
full scale) .
0°C
to +18°C, +28°C to
+50°C

t(0 .3% of reading
+ 0 .1% of full scale) .
Response Time

<1 second .
Maximum Open Circuit
Input Voltage
mA to LOW
terminals

250 V peak .
Maximum Input Current

2 A on
any range .
Input Terminals

Front panel input only
.
Input
Resistance

Range

Resistance
Maximum Floating Voltage
mA terminal to Ground

1000 V peak .
LOW terminal to
Ground

100 0 V peak .
Characteristics

Performance Re uirements

Su

lemental Information
Accuracy for 200~A, 2 mA, 20 mA, 200
mA

Manual ranging only .
and 2000 mA ranges :
Front Panel
40 to 10 kHz Sine
wave
+18° C to
+28° C

t(0.6% of
reading + 0 .3% of full scale) .

Useable
to 20 kHz .
0°C to +18°C, +28°C to +50°C
t(0.7% of reading + 0 .5% of full
scale) .
Response Time

<1 second
.
Maximum Open
Circuit Input Voltage
mA to LOW terminals

250 V peak .
Maximum Input Current

2 A on any
range .
Input Terminals

Front panel input only .
Input Resistance

Same as for do
ammeter .
Maximum
Floating Voltage
mA
terminal to Ground

1000 V peak .
LOW terminal to Ground

1000 V peak .
Table 1-5
DC AMMETER
Characteristics

~

Performance
Requirements

~

Supplemental
Inf ormation
Table 1-6
AC
AMMETER (TRUE RMS)
200
~A

1 kf2
2
mA

100 !Z
20 m A

10 . 2 S2
200 mA

1 .2 O
2000
mA

0 .4 f2

Characteristics
Accuracy for the -55° C to +200° C range :
+18° C to +28° C
Ambient
Input Terminals
Reading Rate
Warm-up Time
P6601 Probe calibrated to
instrument
Any P6601 probe
0° C to +18° C, +28° C to +50° C
Ambient
Probe calibrated to instrument

f4°C from
-55°C to +150°C .
t5°
C
from +150° C to +200° C
Any probe
Power Consumption
Characteristics
Over-Range Indication
Performance Requirements
t2 .5° C from -55° C to +150° C .
f3 .5° C from +150° C to +200° C .
f4 .5° C from -55° C to +150° C .
f5 .5° C from +150° C to +200° C .
f6° C from -55° C to +150° C .
f7° C from +150° C to +200°C .
Approximately 8 W .
3 per second .
Table 1-7
TEMPERATURE
Table 1-8
MISCELLANEOUS
Description
Manual
ranging only .
Front panel only .
Flashing display except 1000 Vdc and 500 Vac ranges .
Specification-DM 502A
Supplemental Information
30 minutes (60 minutes after storage in high humidity environment) .

Specification-DM 502A
Temperature
Operating
Nonoperating
Humidity
Operating
Nonoperating
Altitude
Operating
Nonoperating
Vibration
Operating
Shock
Nonoperating
Bench Handling
Operating
E . M . C .
Operating
Electrical Discharge
Operating
Transportation
Characteristics
a
See
Table 1-10 for system modifiers .
b With power module .
`Without power module .
ENVIRONMENTAL CHARACTERISTICS
Table 1-9
ENVIRONMENTALa
0° C to +50° C b
-55° C to +75° C
+30°C
and +50°C to 90%, +5 -0% b
Test to MIL-T-288008, class 5 .
4 .5 km
(15,000 ft .) b
15 km (50,000 ft .)
0 .64 mm (0 .025")
disp ., 5-55-5 Hz`s`

Test to MIL-T-288008,
class 3 .
(sine
wave) 75 min . total
50 g's (1/2 sine)
11 mse~`
18
shocks
45° or 4" or equilibrium`,
whichever occurs
first .
30 Hz to 1 GHz °
20 kV
max . b
Description
Test to MIL-T-288008, class 5
with
exceptions d .
Test to
MIL-T-288008, class 3 .
Test to
MIL-T-288008, class 3 .
Test to MIL-T-288008,
class 3 .
Test to MIL-T-288008, class 3 .
Charge applied to each
protruding
area of the product
under test
except the
input terminals . No
MIL-T-28800 equivalent . .
Qualified under
National Transit
Association
Pre-shipment Test
Procedures Project : 1A-B-1 and
1 A-B-2 .
'Temperature :
During low temperature test MIL-T-28800B,
paragraph 4 .5 .5 .1 .3(b) for class 5, steps 4 and 5 shall be performed
before step 2
. Also, the instrument shall not be operating during
step 8, paragraph 4 .5 .5 .1 .3(e), class 5 . While operating,
condensed
moisture shall not be present on class 5
Instruments . Drying of the instrument for this class may be performed in a
suitable
chamber, if necessary .

Temperature
Operating
Nonoperating
Humidity
Operating
Nonoperating
Altitude
Operating
Nonoperating
Vibration
Operating

0 .26 mm (0 .010 in) disp ., 10-55 Hz (sine wave)

0.38mm(0 .015in)
75
min .
total

disp . 10-55 Hz
(sine wave) 75 mi n .
Shock
Operating

20 g's (1/2 sine) 11 ms, 18 shocks

30 g's(1/2sine)
11 ms, 18shocks
Bench Handling
Operating

Meets same test standards as plug-in .
Electric Discharge
Operating

Meets same test standards as plug-in .
Transportation
Vibration
Package Drop
Finish
Net Weight
Overall Dimensions
Characteristics

I

TM 501

TM 503

TM 504

TM 506

TM 515
Characteristics
Table 1-10
TM 500 SYSTEMS
ENVIRONMENTAL SPECIFICATIONS
~2 .5 lbs . (1 .13 kg) .
Meets same
test standards as plug-in .
Meets same test standards as plug-in .
Meets same test standards as plug-in .
Meets same test standards as plug-in .
Table 1-11
PHYSICAL CHARACTERISTICS
Anodized aluminim panel and chassis
Description
Specification-DM 502A
2 .633 in (66
.8
mm) W x 11
.240
in
(285 .3 mm) Dx4 .961 in (125 .9 mm) H
.