Tektronix TM500 User Manual

070-2088-02

Tektronix, Inc.

P.O.Box 500 Beaverton, Oregon 97077 Phone 644-0767

First

Printing NOV

1975

SECTION 1

INTRODUCTION

The TEKTRONIX TM 500 line of modular instrumentation offers a new approach to electronic tests and measurements. In the past, monolithic signal sources such as function generators, sine-wave oscillators, pulse generators, ramp generators, and dc power

supplies were often interconnected to oscilloscopes for accurate electrical set-ups or measurements of frequency, period, pulse width, rise and fall times, ac-dc currents, and voltages. The front panel interconnections between these monolithic instruments can often become a

and cables

that obscures one's view of displays and interferes with

convenient operation of front panel controls.

The promise of a better way is here today in the rear interconnecting

interface system of

TM

500 modular instrumentation. No one except

TEKTRONIX offers such an easy-to-interconnect-and-use system.

DMMs, digital counters, and

confusing

maze

of wires

In almost

all TM 500 plug-in instruments, a duplication of front panel input and output connections appears on the plug-ins' rear edge circuit board connector. Since each plug-in connector is located inside the power mainframe on a common rear interface circuit board,

plug-ins can be interfaced to

connecting wires and cables easily installed by the user.

FIGURE

1-1. The number of possible interfacing schemes is only

limited by the imagination. For example, the DM 502

"talk to" one another by way of inter-

SEE

DMM

rear input terminals can be interconnected to an alongside PS 503A power supply for accurately setting power supply voltages.

permanently connected to the power

supply because a special

The DMM is not

INT-EXT front panel switch can be pressed; thereby returning the

DMM to external full function capability. The operation of external

circuits under test can now be measured by the use of standard probes or external wire connections. Another similar example could include interfacing the DC 505A universal counter-timer's dc trigger level output to the

DMM

for setting up the counter's channel A and B LEVEL

controls. Accurate time measurements can now be made by setting the

LEVEL control to DMM-displayed dc voltages representing 10 to 90% amplitude points

for rise times and 50% amplitude points for pulse

widths. The list can go on and on. However, sooner or later one

"HOW

gets around to asking the question,

ments together to form my own viable instrument package?"

do I connect these instru-

This rear

interface manual will suggest some ideas on interconnected systems

and provide readily-accessible reference data so that you can easily

design your own special purpose test set.

REV

A,

The APPLICATIONS INDEX describes some of the already-in-use interconnect

application ideas. The section on BACKGROUND INFORMATION presents ways to obtain the most useful interface scheme. The MODULE DATA section

provides signal input and output pin numbers for all

JUN

1978

TM

500 plug-ins.

Introduction-Rear Interface Data Book

By the way, presently illustrated, just drop us a pencil sketch and a sentence describing your unique idea. addressed as follows:

if you have a new way to interconnect

Information should be

TEKTRONIX

TM

500

P.O. Box 500

Beaverton,

,

INC

M/S

94-396

Oregon 97077

.

TM

500

not

REV

A,

JUN

1978

Section 2-Rear Interface Data Book

APPLICATIONS INDEX

AND

DESCRIPTION OF THE APPLICATIONS INDEX

The following APPLICATIONS INDEX was intended to be used as a quick reference guide to a more complete description of

applications. These applications fall into two generalized categories, consisting of multi-instrument applications. In the first case, most users are aware of generalized instrument applications. As a result, only the

unusual single instrument applications are mentioned in the

index. Single instrument applications requiring lengthy descriptions are located under the specific instrument MODULE DATA section. In the second case, multi-instrument applications may be either located in the MODULE DATA section under the primary important instrument or as an application note made available from the

TEKTRONIX TM 500 Advertising Dept. See address below.*

DESCRIPTION

(1)

single instrument applications, and

APPLICATIONS INDEX

TM

500

(2)

NOTE:

*

See fo

DC 505A Trigger Level Output Network Attenuation or Gain Measurement PS 503A Voltage Regulation via Remote Sensing PS 503A Output Voltage Controlled by External Resistance Programming PS 503A Output Voltage Controlled by External Voltage Programming Waveform Generation System Integration through V to Function Generator Swept Frequency Applications Power Supplies Driven by Signal Sources AC Microvoltmeter

TEKTRONIX,

P.

0. Box 500

l

lowing pages for app Zication descriptions.

INC.

Advertising Dept., M/S Beaverton, Oregon 9 70

76-260

7

F

Conversion

REV

A.

JUN

1978

Applications Index and Description-Rear Interface Data Book

1.

DC 505A TRIGGER LEVEL OUTPUT CONNECTION

TO AN ALONGSIDE DMM

Any

TM

500

DMM

can be used to read out the A and B trigger "level

DC

outff of the facing feature

A

interval

-+

505A is

B

measurements.

universal counter. The benefit of this inter-

improved accuracy in making width B and time

These features are acquired by using a

the

DC

505A

gate lamp,

to measure the

DMM,

+E

in conjunction with

peak and the

-E

peak levels of the pulse train to be counted. The peak-to-peak measurement then used to determine the correct setting of the level controls for the measurement of interest.

The actual connections between the

DMM

and

DC

505A

are made as

illustrated below:

DMM

28B

28A

2.

NETWORK ATTENUATION OR GAIN MEASUREMENT

+

signal

ground

The dBm or dBV measurement capability of the

DC

505A

-+

22A

-+

17A

'

DM

502

can be used to measure the attenuation or gain of a network under test when driven by an SG

502

audio generator. Audio network analysis can be

performed on networks such as filters and amplifiers.

is

Upon completion of interface connections (see below), operation

consists of pressing

Press back to

loss in dB

EXT

is

obtained by subtracting the input and output levels.

DM

502

INT

button to read network input level.

for network output level. The network gain or

The actual connections between instruments to be interfaced follow:

3.

The

plus or minus

502

SG

28A

(SIG OUT)

27A

(SIG GND)

FRONT PANEL

BNC

OUT

-

PS

503A VOLTAGE REGULATION VIA REMOTE SENSING

20

V

NETWORK

-

INPUT (SIG) INPUT OUTPUT OUTPUT

(GND)

(SIG)

(GND)

DM

502

28B (HI)

28A

(LO)

-

FRONT PANEL

FRONT PANEL (LO)

(HI)

power supply regulation can be improved by

REV

A,

JUN

1978

Applications Index and Description-Rear Interface Data

Book

remote sensing DATA section.

4.

at

the load. For more details see PS 503A MODULE

PS 503A OUTPUT VOLTAGE CONTROLLED

BY

EXTERNAL

RESISTANCE PROGRAMMING

The plus or minus 20 V power supply can be controlled via resistance programming through the program resistance values and interconnections may be found in the

PS 503A MODULE DATA section.

5. PS 503A OUTPUT VOLTAGE CONTROLLED

rear

interface. Specific details on

BY

EXTERNAL

VOLTAGE PROGRAMMING

The plus or minus 20 V power supplies can be controlled via an external voltage source through the rear interface.

supplies can now be independently swept from

slew

interconnection and external voltage control information may be

found in the PS 503A MODULE DATA section.

rate depends on the load and the output voltage d~/dt. Specific

6.

GENERATING COMPLEX WAVEFORMS WITH TM 500 INSTRUMENTS

0 to 20 volts. The

One or both

The generation of a variety of differently-shaped signals can be produced by an RG 501 Ramp Generator, two PG 505 Pulse Generators, and an

such

provide a means of determing signal periods, durations,

fall For complete details on this Waveform Generation System, write the TM 500 Advertising Dept. for application note #75M 1.0.

Measurement transducers are often used to produce a voltage that

is

liquid, or electrical energy. But, frequently

to know the total number of units that have been measured by the

transducer during some

it

particular TM 500 instruments can be configured together to provide

this voltage to frequency conversion. The transducer output

first processed by a signal conditioning Amplifier. The resulting output

frequency conversion in a function generator such as an FG 501 or

FG 502. The output frequency

counter. For more complete information on this application, write the TM 500 Advertising Dept. for application note #75M 2.0.

AM

501 Operational Amplifier.

as

the SC 501 or SC 502 can be used along with this system to

times,

proportional to the

is

to know the

delay

7.

times

INTEGRATION THROUGH V TO F CONVERSION

rate

as

well as peak-to-peak signal amplitudes.

rate

time

at any particular point in

of flow of something like a gas, a

interval like a second or a day, than

is

An alongside TM 500 oscilloscope

rise

and

it

is

more important

time.

AM

501 or

is

applied to produce an analog to

displayed on an alongside digital

AM

Three

is

502 Operational

REV

A,

JUN

1978

Applications Index and Description-Rear Interface Data Book

8.

FUNCTION GENERATOR SWEPT FREQUENCY

AND TWO-TONE APPLICATIONS

Although this application was written specifically for the FG 501,

the underlying principles apply equally function generators such as the FG 502 and FG 503. generator can be made to change

by the instantaneous applied voltage appearing at the VCF input

connector. For example, a voltage ramp applied to the VCF input

will

be used for FSK applications where the FG 501 dial setting mark frequency and the positive amplitude For more complete information on this application, write the TM 500 Advertising Dept. for the application note entitled "FG 501 Swept Frequency

provide a linear change in output frequency.

tage will provide two output tones, the output frequency of which determined by the specific levels of the top and bottom portions of the square wave. For example, the two-tone output capability could

application^.^'

its

well

output frequency as determined

to the more recent

A

function

A

square-wave vol-

is

the space frequency.

is

BNC

the

is

9.

POWER SUPPLIES DRIVEN

Any of the analog programmable power supplies such as PS 501, PS 503, or PS 503A plug-ins can be driven by an adjacent signal or function generator to provide a low source impedance suitable for delivering higher currents into load examples would include drive relays, lamps, small motors, loudspeakers, output frequency and Specific information on voltage driving power supply sense inputs

can be found in the MODULE DATA section under Power Supply

Notes.

The

AM

502 and

When the

interface SIGNAL to the

DM

the display on the 2-volt ranges. This measurement application can be

used in setting up low audio signal output levels from an adjacent audio signal source such as the SG 502.

AM

DM

501

etc.

DM

501

501's rear

will

The power supply

risetime

10.

501 can provide ac and dc microvolt measurements.

is

set

for a gain of 1000 (dc-coupled) and

OUT

(28A) and SIGNAL OUT GROUND (27A) are connected

HI

INPUT (28B) and LO INPUT (28A), respectively,

provide a 2 millivolt dc or ac full scale digital

up to

MICROVOLTMETER

BY

SIGNAL SOURCES

a

low impedance load. Some

will

its

follow the signal sources

slew rate limitations.

Interface

its

rear

REV

A,

JUN

1978

Section 3-Rear Interface Data Book

REFERENCE INFORMATION

This section contains the following topics: Interface Circuit Boards, Interface Compatibility, Family Barrier Keys, Interfacing the Standard

Mainframe, Interfacing the Option 2 Mainframe, Quick Change Interfacing,

7

External Interfacing, Option and a Table of Plug-in and Mainframe Power Requirements.

Mainframes, Product Modification

INTERFACE CONNECTIONS

Kits,

The plug-in rear interconnections are made

mainframes module interface circuit board.*

this board are mounted double edge plug-in modules.

--

OF BOARD

COPJNECTORS

Each 28-pin connector mainframe bottom and ending with number 28 near the top. However,

only pin numbers starting with 14 through 28 are used for signal line data interfacing.

mainframe power to the instruments. In the section on module data,

a rear view of only signal line contacts user applications. Since each plug-in connector has a double row of

contacts, the left column (as viewed from the rear of the mainframe or instrument) actual interface connection techniques are described in the remaining

portions of this section.

-.

is

/REAR

is

Pins

designated as B and the right column as

1

OF

numbered starting with number

through 13 are used for connections from

28 pin connectors for accepting

at

the rear of the power

See Figwe

14 through 28

3-1. On

TM

504

REAR INTERFACE CIRCUIT BOARD

1

near the

is

given for

A.

The

REV

A,

JUN

*NOTE:

1978

The

TM

525

rear interconnections are made at the front of the

interface circuit board.

Reference Information-Rear Interface' Data Book

INTERFACE COMPATIBILITY

An

important feature of the instruments in a mainframe to each other, or to external equipment, via the "rear interface". Physically, the rear interface consists of upper 30 edge-card connections at each plug-in compartment, (2) optional

connectors on the mainframe rear panel, and to make connections from plug-in to plug-in, or from plug-in to rear connector, and hence to external equipment.

TM

500-Series

is

the ability to interconnect

(3)

any wiring or cabling used

(1)

the

The wiring or cabling portion of most tomer installed.

A

large number of unique interconnections are possible.

Because of the variety of instruments

TM

500 interconnect systems

comprising the

TM

500 family,

is

cus-

it

was decided to make the interface a custom system with no factory installed bus lines or truly "standard" pin assignments. However, instruments are grouped

I/O

into families with similar

which permits physical lockout of plug-ins from other families.

characteristics and an optional keying system

Use of the optional keying system (with barrier keys) minimizes the possibility of introducing the wrong plug-in into a mainframe compartment when the mainframe has been wired for specialized rear interface connections. However, the assignment of family keys

not intended to make sure that a system

will

be

is

fully functional when plug-ins are installed, only that nothing destructive of hardware (internal or external)

will

stalled. In other words, the main compatibility rules

occur if the wrong plug-in

are:

is

in-

Instruments having dissimilar input/output characteristics are grouped into different families. system,

it

is

possible that installing a plug-in of the wrong family

may be destructive of hardware.

If the rear interface

Install family barrier keys in the

is

wired to configure a

mainframe to avoid possible damage to equipment.

Although family members have similar input/output characteristics, their basic functions may differ drastically.

Only a keying system with a unique key or combination for every individual instrument type would assure system operation.

Therefore,

it

is

only required that family members are neither conducive nor susceptible to hardware failure (destructive)

if plugged into a compartment wired for a different

member of the same family.

FAMILY BARRIER KEYS

A

barrier key contact pins located in the power module circuit board edge connector. See Fig.

ules that are electrically incompatible. result of inserting plug-in modules into a mainframe that has been prewired

for a different classified into family categories.

ments are listed in the following table.

20 barrier keys, order Tektronix Part Number 214-1593-02 from your local

TEKTRONIX

is

a special plastic part designed to be inserted between

3-1.

Its

function

set

Field Office.

of

is

to prevent possible damage to plug-in mod-

TM

500 instruments.

Incompatability can arise as the

Compatible plug-in modules are

The categories and barrier key assign-

If you require an extra set of

REV

A,

JUN

1978

TM 500 FAMILY KEY LOCATIONS

IEEE

BUS

PINS 13-14

488

(GPIB)

DMM

or

TR 502

'INS 17-18

POWER

SUPPLIES

INS 19-20 IPINS 21-22

MEASUREMENT

(COUNTERS

)

INS 23-24

SIGNAL SOURCES

LOGIC

ANALYZERS

WR

501

(LA 501W)

OSCILLO-

SCOPES

RESERVED

PINS 14-15 PINS 15-16 PINS 16-17 PINS 18-19 PINS 20-21 PINS 22-23 PINS 26-27 PINS 27-28

*DM 501 NOTE-Pins 22-23 before

*DM 502 NOTE-Pins 22-23 before

serial

number B072150.

number B024510

Reference Information-Rear Interface Data Book

With a barrier in place in the mainframe connector,

instruments belonging to one of the above-listed families cannot

be inserted into the mainframe wired for a different plug-in

is

family. The key to this lockout feature of the barrier key into the double edge 28-pin connector. plug-ins belonging to a specific family can be inserted into the

module compartment containing the desired family key because of

a corresponding slot cut into the mating plug-in circuit board at the family key location.

INTERFACING TM 500

the actual placement

plug-in

All

THE STANDARD MAINFRAME

The standard mainframe purchased without any options comes without square pin connectors. can be accomplished by hand soldering interconnecting wires or coaxial cables between pin locations at the rear* of the mainframe rear interface circuit board. insulated wire varying in sizes according to current-carrying capabilities can be used for low frequency or dc circuits. Miniature 50Q coaxial cables should be used in high frequency signal environments to eliminate potential crosstalk problems.

Any interfacing between plug-in compartments

See Figure

3-2.

A

good quality

SPECIAL NOTES ON ORDERING COAXIAL CABLES

NOTE #l.

NOTE #2.

Small 50R coaxial cable by the foot.

If

you require a quantity of small diameter 50R

coaxial cab le, order TEKTRONIX part nwnber 1 75- 1020-00

by the foot. Small 50R coaxial cable with pre-installed special

PeZtoZa connectors on each end.

Some plug-in

instruments do not have all inputs or outputs factory-wired to the rear and thus require special internal connections prior to rear interface use. In special cases of this nature, the required information can be fomd under the MODULE DATA section

pertaining to the plug-in of interest.

small diameter 50R coakal cable with special PeZtoZa connectors on each end, then measure and order the optimwn length from the following list

If you require

of

cables.

*NOTE:

Front

in

the

TM

-

515

T~aveler mainfmme.

REV

A,

JUN

1978

Reference Information-Rear Interface Data Book

IWORTANT NOTE:

50f2 COAXIAL CABLES

PELTOLA CONNECTORS

Length

6

inches

8 inches 10 inches 12 inches

14

inches 16 inches 18 inches

Part Number

ON

WITH

EACH

END

If you intend to interconnect your mainframe

as a dedicated system, then the standard mainframe may be purchased as a cost-saving measme. However, if you plan to make numerous rear interconnections throughout the mainframe

life, you should give serious consideration to

2

purchasing an Option

mainframe with pre-installed

square-pin connectors. These connectors offer a way to eliminate hand soldering to circuit board

runs, thereby extending your instrument life and

investment.

THE OPTION 2 MAINFRAMES

The Option 2 mainframes can be purchased in all the standard series except for the rear panel 50-pin male connector, mating cable connector, one connector per plug-in compartment, square pin connectors on the rear interface circuit board, and a special wire kit consisting of standard wires and coaxial cables with mating square-pin receptacles. The actual quantity and length of wires and coaxial cables depend on the number of mainframe compartments. The square-pin connectors are intended to provide a way to make numerous interconnections throughout the mainframe life without causing circuit board damage resulting from numerous hand-soldered connections to the interface circuit board. several interface alternatives, one of which may be more desirable than another depending upon your actual application.

Change Interfacing and External

"NOTE: The

pins at the interface board and a wire kit for easy internal

interconnections. however, the

connector at the rear.

TM

515.h The Option 2 mainframes are supplied with a

See Figure

3-3.

The remaining components offer

Interfacing.

TM

515 Traveler mainframe, Option

Unlike Option

TM

515

has

no

provision for BNCs or a 50-pin

See Quick

5,

provides square

2

on the other mainframe,

BNC

REV

A,

JUN

1978

Reference Information-Rear Interface Data Book

QUICK CHANGE INTERFACING

The quick change interfacing feature makes use of a special set of male-female multi-pin connectors located at the rear of the

mainframe.

See Figure

3-4. The female multi-pin connector may be thought of as a programmer connector. change interfacing technique can prewire as many programmer connectors as required for each individual instrumentation set-up.

After inserting the desired plug-ins into preselected mainframe

compartments, the prewired programmer connector is inserted into the counterpart male muli-pin connector on the rear of the mainframe.

See Figure

3-5. The prewired interconnections on the programmer connector now interconnect the desired plug-ins so that they can "talk" to one another.

The quick change interfacing technique

allows the user to quickly change instrumentation set-ups by

(1)

selecting the new plug-in configuration, and (2) choosing the correct prewired programmer connector for that specific instrumentation set-up

.

The user of the quick

The photograph of Figure

3-6

illustrates how the Option 2 mainframe can be wired to permit use of the quick change interfacing technique. These connectors are not factory-wired in order to give a system designer as much flexibility as possible. Instead, prepared

jumper wires, coaxial cables, a rear 50-pin connector, and associated hardware are included along with each Option 2 mainframe.

Hence, there are no pin assignments for rear panel connectors because of the wide variety of possible connections.

The external programmer connectors for quick change programming can be ordered from the list of hardware materials below.

--

50-PIN

FEMALE

PROGRAMMER

HARDWARE

Part Number Description Quantity

1

131-1319-00 Cover, conn; molded plastic

each

wlhardware

131-1345-00 Conn, rcpt, elec: 50 contact female

1

each

EXTERNAL INTERFACING

The external interfacing technique makes use of the Option

2-

supplied 50-pin rear male connector as a means to interface with equipment external to the

TM

500 system.

See Figure

3-7.

Users

can order additional hardware to make up a completed plug-on external connector from the Following parts list.

REV

A,

JUN

1978

Reference Information-Rear Interface Data Book

Part Number

131-1319-00

131-1345-00

WTE:

The number of wires contained within the external connector cable depends upon the specific user's requirements.

EXTERNAL

Cover, conn; molded plastic wlhardware

Conn, rcpt, elec: 50 contact female

CABLE CONNECTOR

50-PIN FEMALE

Description

HARDWARE

CONNECTOR

Quantity

1

each

1

each

The external multi-conductor cable should be obtained from a ZocaZ multi-conductor cab Ze supplier or vendor.

CAUTION:

Center for service, please notify the service center that the mainframe has been 'interfaced. return of your instrument.

module and plug-in(s) to the service center.

In the event your mainframe

This

It

will

is

advisable to return both power

is

sent to a TEKTRONIX Service

save money and expedite the

THE OPTION 7 MAINFRAMES

The following described bus wires and barrier keys are added to the

'EM

rear interface connector boards in the following

modules in order to provide rear interface connections between the

DC

508 Option 7 Counter (or other Option 7 counters), TR 502 Tracking

Generator, and SW 503 Sweep Generator.

Bus Wires. Six-conductor ribbon cable (Tektronix Part Number

00)

TM

is

used to make bus runs between the

503,

TM

504,

TM

506, TM 515

following points.

B14 on J10, 520, and 530 B15 on J10, 520, and 530 J10, 520, and 530

B16 on J10, 520, and 530 are plug-in connectors.

B17 on

J10, 520, and 530 See Power Module instruction

I318 on J10, 520, and 530 Manual. A18 on J10, 520, and 530

Plastic barrier keys (Tektronix Part Number 214-1593-02) are inserted between pins 21 and 22 on J10 (Counter slot), between pins 23 and 24 on 520 (Sweep Generator slot), and pins 17 and 18 on 530 (Tracking Generator slot).

500-series power

175-0829-

Once the above bus connections are made and barrier keys inserted, the three connectors so changed are system dedicated and the three slots

should be used only for system-dedicated

plug-En modules.

REV

A,

JUN

1978

PRODUCT MOD1 FICATION KITS

Reference Information-Rear Interface Data Book

Product rnodificta.&ion kits are available to modify the following

series

tion kit by

instruments for the indicated reasons. Order a product modifica-

its

part number.

All

TM

503,

REAR

TM

504, TM 506,

INTERFACE

WIRING.

RTM

506, and

TM

Modification kit provides parts and instruc-

tions to install two Bergstick connectors

(mounted in plastic)

and custom wiring between two or more compart-

515.

14, -025 inch square pins

serial numbers.

ments in a standard mainframe. This kit also allows the user of an

TM

Option 2 mainframe (Option 5 for a

515) to wire three compartments in parallel by installing right-angle connectors on one end of the bus

wires.

frame to an Option

Digital Counters except Option 4 counters.

This modification kit does not convert a standard main-

2

or Option 5 mainframe. Order PN 040-0846-00.

DC

501,

DC

502, and

DC

503.

All

serial numbers

DECIMAT., modification to make the above listed counters compatible with the TEK 21 or TEK 31 Calculator. Order PN 040-0713-00.

All

Leveled Sine-Wave Generator SG 503.

AND

BCD

AMPLITUDE CONTROL

OUTPUT. Order PN 040-0717-00.

LA 5011~~ 501 CONVERSION TO LA 501W.

serial numbers. REMOTE

All

serial numbers. This modification kit provides parts and instructions to modify the Logic Analyzer LA 501 and the Word Recognizer When modified, the system

6 compartment

TM

500 mainframe dedicated to Logic Analyzer operation.

This kit does not provide instructions

TM

LA 501W with a

500 oscilloscope through the rear interface. Order

(LA

501~)

will

to connect the LA 501 or

WR

501 to a LA 501W.

operate in any 3, 4, 5, or

PN 040-0806-01.

TM

500-

REV

The

following table for way to determine the power required for each instrument. and maximum value in WATTS of LOW LINE (108 VAC), NORMAL LINE (120 VAC) and

TM

500 plug-ins

is

given for three line voltage values

is

provided as a convenient

A

HIGH

LINE (132 VAC). The minimum and maximum values arise as a result of different front panel control settings of individual plug-ins and varying external

loads connected to power supplies and signal sources. To calculate the

total power which

will

be drawn by a system, add the appropriate instrument requirements to the mainframe requirement at the bottom of the table.

A,

JUN

1978

minimum

Reference Information-Rear Interface Data Book

POWER REQUIREMENTS FOR

Low Line - 108

VAC

Instrument Min.Watts Max. Watts

'I'M

500

PLUG-INS

Nominal Line - 120

Min.

Watts Max. Watts Min. Watts Max. Watts

AND

MAINFRAMES

VAC

High Line

-

132

VAC

TM

RTM

TM

501 503 504 506 506 515

REV A,

JUN

1978

Reference Information-Rear Interface Data Book

POWER WQUIIXEXENTS

L-

Low Line - 108

VAC

FOR

TM

500 PLUG-INS

Nominal Line - 120

AND

VAC

MAINFRAJ!ES

High Line - 132

Instrument Min. Watts Max. Watts Min. Watts Max. Watts Min. Watts Max. Watts

VAC

REV

A,

JUN

1978

Reference Information-Rear Interface Data Book

TM

500

PLUG-IN WEIGHTS, NET, APPROX.

(LESS EXTERNAL CABLES/ACCESSORIES)

1.8 lb.

1.8

.o

2

1.8

2.1 la4

2.3

2.5

1.5

2 a0

2.3 lb.

3.6

1.6

1.9

1.1

1.3

2.1

5.6

5.5

6.0

2.0

2.6

3-1

*

4

Includes

Inclucies

LA

1.8

2.0

501,

501

WR

501, and connection cables.

WR

501

&

connection

cables.

WR

501

TM 501

TM 503 TM 504 TM 506

RTM 506

TM 515

3.3

2.0

7.1

7.3

2.6

5.4

9.5

20.5

29.0

31.5 22,5

REV

A,

JUN

1978

Section

5-Rear

SIGNAL PROCESSORS

Interface Data Book

REV

A,

JUN

1978

Signal Processors-Rear Interface Data Book

REV

A,

JUN

1978

Signal Processors-Rear Interface Data Book

AF

501

Plug-In or Power Module

ASSIGNMENTS

FUNCTION

Ground (Amplifier Output)

Tri gger Output

I

1

28B

cONTAcTs

-,

l

1

-

25B 25A

Rear

ASSIGNMENTS

CONTACTS FUNCTION

28A

Amplifier Output

27A

Ground (Trigger Output)

26A

View

REV

A,

JUN

1978

CAUTION

When a Power Module compartment has been selected for the

AF

502

and wired for a speciaZized interface system, a

pZas

kit

barrier (Tektronix Part Number

be insta2Zed in a key slot between contacts

the Power Module.

Do not insert any ModuZe and do not use excessive force when inserting the plug-in.

TM

500

Series phg-in in a live Power

224-

2593-02) should

23

and

24

on.

Signal Processors-Rear Interface Data Book

AF

501

INTERFACE

Amplifier

Contact

when switch S210 (internal Output)

specifications for contact front-panel connector.

Tri gger

Contact 27B connector when switch S310 (internal Trig out) The specifications the front-panel connector.

Ground

Contacts is

switched to ground at the same time the to the rear interface by S310, while contact at the same time

by

S210.

Output

28A

is

Output

is

(Tri gger

27A

and

placed in parallel with the front-panel OUTPUT connector

28A

placed in parallel with the front-panel

for contact 27B are the same as those stated for

Output

28B

the

and

Amp1

are both switched to chassis ground.

Amplifier Output

IIOTES

is

set to Int position.

are the same as those stated for the

i fier

Output)

Trigger Output

is

switched to the rear interface

is

28B

The

TRIG

set to Int position.

is

switched to ground

OUT

Contact

is

switched

27A

REV

A,

JUN

1978

Signal Processors-Rear Interface Data Book

AM

501

Plug-In

ASSIGNMENTS

FUNCTION CONTACTS

(+)

signal in

-

Signal In

or Power

Ground

28~

25~

24B

221321s

-!

Module

CONTACTS

14-

28~

-

27~

+-

26A

25~

21A

-

20A

Rear

ASSIGNMENTS

Signal

View

FUNCTION

Out

Ground

19A

-

18A 17A

16A

15E

14B

CAUTION

When a Power Module compartment has been selected

AM

for the face system, a plastic barrier (Tektronix Part Nwnber 224-2593-021 slot between contacts

502 and wired for a specialiaed inter-

should be installed in a key

23

5A

14~

and 24 on the Power Module.

None of these assignments are factory wired. See INTERFACE

NOTES for wiring instructions.

NOTE

REV

A,

JUN

Do not insert any TM 500 Series plug-in in a live Power Module and do not use excessive force when

inserting the plug-in.

1978

Signal Processors-Rear interface Data Book

AM

501

Introducti on

None of the rear pin connectors (except power supply connections)

are factory wired.

28B

have their own solder pads

wire his own input and output connections to the rear interface. The

pin assignments compatibility with other TM

Instead, pins 21A through

listed on page

I

NTERIACE

500

NOTES

(holes)

1

are suggested in order to ensure

Series instruments.

28A

and

21B

through

to allow the user to hard

Signal

for signals obtained from a specific point in a simple or complex operational amplifier feedback circuit. not always the same point that output connectors. solder pin point may be located on the circuit board or at one of the front panel output connectors, depending on your circuit requirements. you can disconnect an undesirable front panel output connection.

Using pin

Circuit Board.

not be desirable to connect pin

27A

connected to the rear interface must take this

Out

(contact

28A

at the rear connector should be thought of as an output terminal

#22

or

#26

28A

to the desired point in the operational amplifier circuit.

#22

or

#26

27A

to the large foil area marked

would be a "floating" connection and the design of external circuitry

28A)

To connect pin

wire (of the proper length) from the solder pad for

wire, solder the proper length from the solder pad for

In some types of operational amplifier circuitry,

and Ground (Contact

A

specific output terminal

is

connected to one of the front panel

28A

to the specific output terminal,

GND

on the

27A

to

GND

(chassis); in those cases pin

27A)

If

necessary,

"A"

side of the Main

fact under consideration.

is

This

it

Making Signal Input and Ground Connections

Use

$22

or

#26

wire to hard wire the - Signal In (inverting input) from

the solder pad (hole) for

22B

to the large foil area labeled Circuit Board. inverting input)

GND

the

22B.

cable instead of standard gauge wire.

connections for pin

High frequency signals may require the use of miniature coaxial

Perform the same operations for the

from pin 24B to the input of your circuit and hard wire

21B

to the input of your circuit.

GND

on the

25B

in the same manner as stated for pin

"A"

side of the Main

+

Signal In (non-

Hard wire

may

NOTE

If

more than a foot or two of coaxial cable is connected

to the rear interface output contact (pin

28AI,

an isolation resistor equal in value to the coaxial cable impedance should be inserted in series with the center

conductor of cable.

is to reduce ringing effects due to

The purpose of the series resistor

loading factors.

REV

A,

JUN

1978

Plug-in or Power Module Rear View

ASSIGNMENTS

FUNCTION CONTACTS

278 26B

+

Signal In Ground

+

Signal In

-

Signal In Ground

258

248-

23B 22~

4

--'

-.

--,

-

Signal

Processors-Rear Interface Data Book

--

-

ASSIGNMENTS

CONTACTS FUNCTION

1-

27A

Signal

Out

Ground

AM

502

-

Signal In

When a Power Module compartment has been selected

for the

system, a plastic barrier (Tektronix Part Nwnber 224-1593-02) should be installed in a key slot between contacts

AM

218,

7A

-

16~

15E

CAUTION

502

wired for a specialized interface

23

and 24 on the Power Module.

1

5A

Signal Out and aZZ grounds are factory wired. See the INTERFACE NOTES for Signal

In wiring instructions.

NOTE

REV

A,

JUN

1978

Do not insert any TM Power Module and do not use excessive force when

inserting the plug-in.

500

Series plug-in in a live

Signal Processors-Rear Interface Data Book

AM

502

INTERFACE

Signal

Pins

27A Out from the front panel bnc connector to use the output signal on pin

Signal

These input connections must be user wired. Use the center conductor of a miniature

(solder) the from the associated solder pads at the rear connector pins to the appropriate coaxial cable shields chassis ground connections (pin

-

Signal In).

Out

(Contact

28A

and

27A

is

chassis ground.

28A.

28A)

and Signal

are factory wired to rear interface contacts. Pin

It

is

Input Connections (contacts

50

S2

coaxial cable (about

+

Signal In (pin

+

and - front panel bnc connectors. Solder the associated

(braids) to the associated solder pads for the

NOTES

Out

Ground (Contact

not necessary to disconnect the Signal

24B,

21B,

24B)

and the - Signal In (pin

25B

for + Signal In and pin

25B,

and

11

inches long) to hard wire

27A)

22B)

21B)

22B

for

NOTE

The addition of coaxiai! cable connections

to the front pane2 bnc connector increases the input

capaci tance

.

REV

A,

JUN

1978

Signal Processors-Rear Interface Data Book

AM

503

Plug-In

ASSIGNMENT$

FUNCTION

or

Power

CONTACTS

Module

1

ASSIGNMENTS

CONTACTS

-

28~

Signal Output

Rear

FUNCTI

View

ON

-

19A

Signal Out and Ground are factory wired.

17A

nal input assignments.

-

16A

Each Rear Interface Connection shown has its nection pad. See Interface Notes.

CAUTION

When a Power Module compartment has been selected for the

AM

503

and

wired for a specialized interface sys-

a

tem, should be installed in a key slot between contacts

and Do not insert any

Module and do not use excessive force when inserting the plug-in.

plastic barrier (Tektronix Part Nwnber 224-1593-02)

24

on the Power Module.

TM

500 Series plug-in in a live Power

NOTE

There are no sig-

own

through-hole-plated con-

23

REV

A,

JUN

1978

Signal Processors-Rear Interface Data Book

AM

503

I

NTERFACE

NOTES

Signal

Pins rear interface. To provide the output signal on

necessary to disconnect the coaxial lead from the rear of the

front panel bnc connector the coaxial connector, interface pin located for the

Output (contact

28A

and

27A

are the only pins that are factory wired to the

28A.

AM

28A)

5480. 5480

No other input/output assignments are al-

503 at this time.

and Ground (contact

(OUTPUT INTO

50

R) and insert it into

is located close to rear

27A)

28A,

it is

Impedance Matching

The output from the provides this load at the rear interface when the signal output from

600

disconnect

manual)

28A

is connected to a device with an input resistance of

R, or greater.

R480. R480

.

AM

503 requires a 50 R load.

If

the device has an input impedance of is located next to

5480

R480 (49.9

(see instruction

R)

50

R,

REV

A,

JUN

1978

Signal Processors-Rear Interface

Data

AM

Book

511

Plug-In

ASSIGNMENTS

FUNCTION

or

Power

CON

rACTS

Module

ASSIGNMENTS

CONTACTS

Rear View

FUNCTION

REV

Each Rear Interface Connection shown has its own through-hole-plated connection pad.

CA

UTION

When a Power Module compartment has been selected for the

AM

512 and wired for a specialized interface system, a plastic barrier (TekCronix Part Number 214-2593-02) should be installed in a key slot between

23

and

24

contacts Do not insert any

on the Power Module.

TM

500 Series plug-in in a live Power Module and do

not we excessive force when inserting the plug-in.

A,

JUN

1978

Section 6-Rear Interface Data Book

DIGITAL COUNTERS

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

NOTES

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

General Counter Information

GENERAL

TTL

Voltage

The words rear contacts under specific conditions. TTL specifications are as follows: exists from

LO

voltages between

+2.0

maximum value.

V

and

Time-Ladder

All of the counters use time-slot pulses derived from a Scan Clock

signal to select a particular decimal digit front-panel LED display. the basic time relationships between waveforms discussed under the

INTERFACE

forms available at the rear interface. The waveforms are to be used only as a guide when interpreting the individual data discussed for each Counter.

Levels

"HI"

and

A

TTL

+2.4

+.

5.0

Di

agram

NOTES

"LO"

LO

output exists from

V to

0.0

V.

Where

for each Counter. No one Counter has all of the wave-

COUKIER

refer to TTL voltage levels present on the

+5.0

V.

V

and

TTL

The following

INFORMATION

0.0

V

to

0.4

V.

A TTL

Rear interface inputs will accept TTL

+0.8

V.

TTL

HI

inputs must be between

currents are given, the quantity is a

that is displayed on a

time-ladder diagram illustrates

HI

-

output

NOTE

fiorough understanding

Q

f

the schematic diagrams

and the exact internaZ connections for input/output

lines to the rear contacts

TM

will

500

interface system.

instruction manuaZsl your speciaZized

ffound

be an aid in designing

in individual

REV

A.

JUN

1978

Digital Counters-Rear Interface Data Book

General Counter Information

TYPICAL

FRONT- PANEL

DISPLAY

DECIMAL POINT SCANNED

----

I

111

Ill

~efe7 to

m

V,

m

0

j

GENERALIZED TIME-LADDER DIAGRAM

INTERFACE

NOTES

for

each

individual Counter

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

Plug-In or Power Module Rear View

DC

501

Decimal Point

MHz

light or

(Dl)

Output

External

Internal Output

Scan

MSD

ASSIGNMENTS

FUNCTION CONTACTS

(D2)

Decimal

Scan

Clock

Qverf

(TS-1)

BCD

Data

Output

Point

Clock

low Output

Good Output

(2)

(8)

Input

(2

kHz)

Output Output

Output

288

26B

27B

23B

'"

228-1 p2zA 21~4 k21A

20B- 20A

18B 18A

178

CONTACTS

-1

1-

,

3

-+

"1

-4

1

,

1-

ASSIGNMENTS

28~ 27~

26~ 25~

19A

17A

Internal Scan Clock Disable Input

Reset

TS@

BCD

Signal Input Ground

FUNCTION

Input/Output

(Time Slot Zero) Output

(4)

Output

(1)

Output

Decimal

(Optional

When a Power Module cornpartmerat has been selected for the

wired for a specialized interface system,

Part Nder 214-2593-08).skould

contacts Do not insert any

do not use excessive force when inserting

REV

A,

JUN

Point

29

1978

(03)

Output

-

See

Notes)

and 22 on the Power ModuZe.

TM

550

15~4

Series plug-in in a live Power Module

)C15A

4

Avk

CAUTION

ba

installed in a key slot between

14A

a

the

Clock-In/Clack-out

(Optional

plastic barrier (Te'ektronix

plug-in.

-

DC

See Notes)

502

and

Digital Counters-Rear Interface Data Book

DC

501

I

FS[ERlACE

BCD

Outputs

Contacts 20B, interface. The count (front-panel display) digit method, with the decimal digit sequence being from left to right (MSD to

LSD

as observed on the front-panel display). The binary levels for each

decimal digit use positive-true logic

is

capable of driving

(8,

4,

2,

1

Code)

20A, 21B and 19A provide

6

TTL

loads (10

NOTES

BCD

data directly to the Power Module

is

(HI

=

1,

mA).

transmitted in a serial-by-decimal

LO

=

0).

Each output data line

Decimal

TTL

on contacts switch and front-panel decimal point location. from left to right on the front-panel display, levels are caused by a switch contact closure to chassis ground, except for an Option

be above chassis ground by about

Poi nt/Front-Panel Status

logic levels are transmitted directly to contacts 27B and 28B.

27B

and

28B

is

related to the position of the MEASUREMENT

2

instrument where

CONTACT DISPLAY

LIGHT

MHz MHz kHz kHz GATE

Outputs

AUTO

0.4

ON

Decimal points are numbered

(See Table below.)

gate operation can cause the

volt.

MEASUREMENT

I

DECIMAL POINT

.oooo

.ooooo

.OOO

.oooo

000

(D2) (Dl

)

(D3)

(~2)

(None)

INTERVAL

MANUAL (Start

LO

The data

INTERVAL

All

LO

levels to

Sec

Sec Sec

NOTE

If a direct active-Zow level output is desired for

(.ODD),

03

stranded wire be connected from the switch end of

R284

with your externaz equipment.

to an unassigned rear contact that is compatible

suggested.

it

is suggested that a

#22

or

#26

AE

Rear contact Z5B is

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

501

Data

A

at each updating of the

MHz clock,

MHz

1.2 microseconds. The Data Good output (19B) goes internal gate AUTO gate selection period (option 2). The storage register

HI

This contact be used as either a Reset Input or Reset Output function. Contact 26A normally at a positions of the MEASUREMENT INTERVAL switch),

other count.

Good

positive-true Data Good pulse

clock (option 1) produces a pulse duration that varies between 0.2 and

the positive-going edge of the Data Good pulse. Rear contact 19B also goes

and remains

(totalize) position.

Reset

tions (when changing the MEASUREMENT INTERVAL switch positions). Rear contact 26A does not go

Output

the pulse duration varies between 0.5 and 1.5 microseconds; a

Input/Output

(Contact

time

selected by the MEASUREMENT INTERVAL switch position or

HI

as long as the MEASUREMENT INTERVAL switch

(contact

is

directly wired to the front panel RESET pushbutton and can

HI

level and goes LO when the RESET button

LO

when the

19B)

transmitted directly

is

DC

501 storage register.

This output

will

26A)

DC

501 clears

to

rear

For an instrument with a

HI

immediately after the

is

drive at least 6 TTL loads.

is

pushed

or between switch detent posi-

its

own internal circuitry for an-

contact 19B

1

5

updated on

in the MANUAL

is

(for any

it

To use 26A as a counter Reset Input function, external switch contact closure to ground or driven LO by an open-collector

9

logic gate capable of sinking

Scan

These three functions

wave) Internal Scan Clock signal

a nal Scan Clock Disable)

to LSD, with the rising edge of each Scan Clock period selecting the decimal digit to be displayed.

BCD

Internal Scan Clock). Scan Clock period. Using the Internal Scan Clock signal

millis&conds for a complete display scanning cycle.

This requires that an external the Scan Clock signal.

Setting rear contact 27A to a TTL low disables the Internal Scan Clock and allows the application of an External Scan Clock signal to rear contact The External Scan Clock should be a TTL signal, with a maximum frequency of

1

Clock

continuous output to the rear interface as long as rear contact 27A (Inter-

output lines for one complete Scan Clock period (500 microseconds for

Output,

Input,

and

are

all wired directly to rear contacts.

is

held

The binary levels

All

the

BCD

data

is

(decode)

MHz

and a fall

2

kHz, if desired). Consequently, the time of a complete display scan and

time-slot pulse duration will change accordingly.

time

during the negative half of

of less than 100 nanoseconds (frequency may be less than

TTL current loads

Disable

HI.

of the time-slot pulses have a duration equal to a

BCD

(Contacts

(TTL)

is

applied to rear contact 24B, providing

The decimal digits are scanned from MSD

for a selected digit remain on the

decoder be driven by the falling edges of

can be

(15

24B,

set

to a LO by an

mA).

25B, and 27A)

A

2 kJ3z (square

it

takes about The ideal the Scan Clock period.

time

4

to read

25B.

REV

A,

JUN

1978

6-7

Digital Counters-Rear Interface Data Book

DC

501

One advantage of the External Scan Clock and Internal Scan Clock Disable inputs

is

to allow the user to design a data at a faster or slower rate than frequency External Scan Clock be applied continuously to rear contact 25B, although BCD

the time-ladder diagram for an example of using the External Scan Clock and

Internal Scan Clock disable pulse.

it

could be done.

data capture, but could also cause false front;panel displays.

BCD

A

continuous

data capture system that extracts

It

is

2

kHz.

1

MHz

not intended that a high-

External Scan Clock would allow

Refer to

the

Time-Slot

TS@

on rear contact 25A to a Scan Clock period and occurs is

a pulse that predicts

and 19A

a

synchronizing pulse for external equipment, used as a latch pulse, or to

clear/reset external digital circuitry.

The MSD (TS-1) also has a duration equal to a Scan Clock period and occurs once per complete display scanning cycle. Some users may prefer to use the MSD pulse for synchronizing external equipment, rather than using the TS@ pulse.

TS@

and TS-1 are the only time-slot pulses directly wired to rear contact.

Overflow Indication (Contact

Rear contact conditions;

the storage register the next input count;

by increasing the overflowing the display). OVERFLOW light

Zero

will

be

23B

(1) when the

(TSP) and MSD

equivalent to the MSD during TS-1,

output on rear contact 22B

(TS-1).

is

a TTL negative-going pulse that has a duration equal

that the next BCP output data on contact 20B, 20A, 21B

(contacts

once per complete display scanning cycle.

is

a

238)

is

normally at a LO level.

DC

is

full of nines

(2)

MEASUREMENT

is

on.

501

is

operated in the

(9999999

when making high-resolution frequency measurements

INTERVAL

Contact

by a factor of 10 or greater

23B

is

This contact goes

HI

and time that the front-panel

25A

and

22~)

This pulse may be used as

TTL

positive-going pulse that

(left-side digit)

HI

under two

MANUAL

display), contact 23B goes

(Totalize) mode and

(deliberately

HI

It

on

Signal Input (contact

Rear contact 16A signals to be counted or measured are applied to contact

switch must be in the INT position. load (~101) and miniature

to this contact on the Option 2 Power Module interface. Connect the coaxialcable shield to rear contact cations apply when signals are applied to contact 16A.

end of

RlOl

converts the input resistance to

is

16A

and

17A)

directly wired to the front-panel

1

is

MQ.

50

Contact 16A

ohm

RF

cable should be used to connect signals

17A

for a Signal Input Ground. Input specifi-

EXT

-

INT switch.

16A,

terminated into a

Lifting the ground

the

front-panel

REV

50

A,

When

ohm

JUN

1978

NOTES

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

Plug-In or Power Module Rear View

DC

502

ASSIGNMENTS

FUNCTION CONTACTS

Decimal Point

MHz

light

(Dl)

Output

External Scan Clock Input

Internal Scan Clock (2

Output

or

Data Good Output

(D2)

Output

Dechal Point

Overflow Output

BCD

(2)

Output

BCD

(8)

Butput

kHz)

288

-,

I

26B 25B

4

238-

24B

I

21

4

208

+

9B-

ASSIGNMENTS

CONTACTS FUNCTION

-

27~

,

26A

+

25A

-

17A

-

16A

Internal Scan Clock Disable Input Reset Input/Output TSQ (~irne Slot Zero) Output

Signal Input Ground Signal Input See Notes

Decimal Point (~3) Output

(Optional

When a Pomr ModuZs compartment has been seZected for the wired for a spscialized interface system, a pZastio barrier (Tektronix Part Number

contacts Do

not

do not use sxcessive force when inserting the plug-in.

-

214-2593-02)

22

and

insert

See Notes)

22

on

any

TM

550

the

,

5B

,

14B

CAUTION

should

Powsr

Series plug-in in a live Power Module

be

instaZZed in a key slot between

ModuZe,

-

14A

Clock-In/Clock-out

(Optional

-

See Notes)

DC

502

and

md

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

502

INTERFACE

BCD

Outputs

Contacts

Module interface. The count (front-panel display)

serial-by-decimal digit method, with the decimal digit sequence being from left to right The binary levels for each decimal digit

(HI

=

1,

(10

mA).

Decimal

TTL logic levels are transmitted directly to rear contacts data INTERVAL switch and front-panel decimal point location,

Decimal points are numbered from left to right in the display.

tables are applicable to standard

LO

on

levels are caused

(8,

4,

2,

1

Code)

20B,

LO

Poi

these contacts

20A, 21B and 19A provide

(MSD to LSD as observed on the front-panel display).

=

0).

Each output data line

nt/Front-Panel Status Outputs

is

related to the position of the

by

a switch-contact closure to chassis ground.

NOTES

DC

502

BCD

data directly to the Power

is

transmitted in a

are

expressed in positive logic

is

capable of driving 6 TTL loads

27B

and

MEASUREMENT

(See Table below.)

or an Option 1 instrument.

28B.

The following

The

All

DIRECT INPUT

I

CONTACT

I

PRESCALE INPUT

DISP

LIGHT ON

MHz MHz

kHz kHz

Gate

MHz MHz

MHz

kHz

Gate

AY

DECIMAL POINT

.OOOO (D2)

.OOOOO (Dl)

.OOO (D3)

.OOOO

000

.OOO (03)

.OOOO (DZ)

,

.OOOOO (Dl)

i

I

.OOO

i

000

(D2) (None) MAN (Start)

(D3)

(None)

I

1

I

!

MEASUREMENT

INTERVAL

.O1 Sec

Sec

.I

1

Sec

10

Sec

.O1 Sec

.I

Sec

1

Sec

10

Sec

MAN (Start)

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

NOTE

If

a direct active-low level output is desired

03

(.

for

0001,

wire from the switch end of

connect

a

#22

or

R248

#26

AWG

stranded

to an unassigned rear contact that is compatibZe with your external equipment.

Rear contact

15B

is suggested.

DC

502

Data

A at each updating of the

1

5

1.2 microseconds. The Data Good output goes gate time selected by the MEASUREMENT INTERVAL switch position. register

Rear contact 19B also goes

INTERVAL switch

will

Reset

This contact be used as either a counter Reset Input or Rest Output function.

26A

detent positions. circuitry for another count.

To by

collector logic gate capable of sinking

Good

Output

positive-true Data Good pulse

MHz

clock,

MHz

clock (Option 1) produces a pulse duration that varies between 0.2 and

is

updated on the positive-going edge of the Data eood pulse.

drive at least 6 TTL loads.

Input/Output

is

normally at a HI

(for any position of the MEASUREMENT

use 26A as a counter Reset Input function, an external switch contact closure to ground or driven LO

(contact

the pulse duration varies between 0.5 and 1.5 microseconds;

is

in either of the

(Contact

is

directly wired to the front-panel RESET pushbutton and can

26A does not go LO when the

198)

is

transmitted directly to rear contact

DC

502 storage register.

HI

immediately after the internal

HI

and remains

MAN

HI

as long as the MEASUREMENT

(~otalize) positions.

%A),

level and goes LO when the

INTERVAL

9

switch),

DC

it

TTL current loads (15

For an instrument with a

RESET

502

can be set to a

button

or between switch

clears

its

by

19B

The storage

This output

Contact

is

pushed

own internal

LO

level

an open-

mA).

a

Scan

These thsree functions are all wired directly to rear contacts.

wave) Internal Scan Clock signal (TTL)

a continuous output to the rear interface as long as rear contact 27A

MSD to LSD,

decimal digit to be displayed. remain on the

microseconds for Internal Scan Clock).

a duration equal to a Scan Clock period. signal, The ideal time to read a Scan Clock period. This requires that an external

by the falling edge of the Scan Clock signal.

REV

A,

Clock

(~nternal Scan Clock Disable)

JUN

1978

Output,

with the rising edge of each Scan Clock period selecting the

BCD

it

takes about 4 milliseconds for a complete display scanning cycle.

Input,

output lines for one complete Scan Clock period (500

and

(decode) the

Disable

is

held

The binary levels for a selected digit

(Contacts

is

applied to rear contact 24B, providing

HI.

BCD

The decimal digits are scanned from

All

Using the Internal Scan Clock

data

24B,

of the time-slot pulses have

is

during the negative half of

258,

and

BCD

decoder be gated

27A)

A

2

kHz

(square

6-1

3

Digital Counters-Rear Interface Data Book

DC

502

Setting rear contact allows the application of an External Scan Clock signal to rear contact 25B. The External Scan Clock should be a TTL signal with a maximum frequency of

MHz

and a fall

2

Hz,

time-slot pulse duration will change accordingly.

One advantage of the External Scan Clock and Internal Scan Clock Disable inputs

is

at a faster or slower rate than External Scan Clock signal be applied continuously to rear contact 25B,

it

capture, but can also cause false front-panel displays,

Time

Time Slot Zero has a duration equal to a Scan Clock period and occurs once per complete display cycle.

contacts 20B, 20A, 21B, and 19A will be equivalent to the most: significant digit during TS-1. This pulse can be used as a synchronizing pulse for external equipment,

digital circuitry.

if

to allow the user to design a

can be done.

Slot

time

desired).

Zero

and

(TsQ) on rear contact 25A

TS@

used

27A

to a

of

less

Consequently, the

A

continuous

MSD

(Contacts

is a pulse that predicts that the next

as a larch

TK

LO

disables the Internal Scan Clock and

than 100 nanoseconds (frequency may be less than

2

1

MHz

pulse,

time

BCD

data capture system that extracts the data

kHz.

External Scan Clock signal allows

25A

and

or

a

of a complete display scan and

It

is

not intended that a high-frequency

22B)

is

a TTL negative-going pulse that

clearlreset pulse for external

BCD

data

BCD

to

appear on

1

although

data

The

MSD

(TS-1) output on rear contact 22B

has

also display scanning cycle. digit) pulse for synchronizing external equipment, rather than using the TSO) pulse. rear contacts.

Overflow

Rear contact 23B conditions: storage registers on the next input count;

by

increasing

23B

Signal

a duration equal to a Scan Clock period and occurs once per complete

Some users

Ts~ and MSD (TS-1) are the only time-slot pulses directly wired to the

Indication (Contact

is

HI

Input

(1)

the

any

time

(Contacts

It

problems attention

continuities along a high- frequency signal path.

is

normally

when the

are

full of nines

MEASWME,NT

that the front-panel

16A

is

important to consider

238)

at

DC

502

(2)

when making high-resolution frequency measurements

INTERVAL

and

at

high

$0

lead dress,

may

a LO level.

is

operated in a

(9999999

17A)

NOTE

frequencies.

is

a TTL positive-going pulse that

prefer to use the

This contact goes

MAN

display), contact

by

a

factor of 10 or greater.

OVERFLOW

VSWR

terminations,

light

and cross-talk

Pay particuZar

MSD

(left-side

HI

under two

(Totalize) mode and the

23B

goes

HI

Contact

is

on

and

dis-

Rear

contacts

16A

and

17A

are

not

directly

wired

to

the input and ground

REV

A,

JUN

1978

Digital Counters-Rear Interface Data

Book

NOTES

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

502

Option

7

Plug-In

ASSIGNMENTS

FUNCTION

Decimal Point (~2) Output

MHz light or Decimal Point

(Dl) Output

External Scan Clock Input

Internal Scan Clock (2 kHz) Output

Overflow Output

(TS-1) Output

MSD

BCD

(2) Output

BCD

(8)

Output

or

Power

CONTACTS

Module

ASSIGNMENTS

CONTACTS

Internal Scan Clock Disable Input Reset lnput/Output

TS@

BCD

Rear

(Time Slot Zero) Output

(4)

View

FUNCTION

Output

Opt

BCD

Data Good Output

7

Opt

7

Track. Gen. Identify

Start Count Counter Identify Opt

7

Phase Lock

7

Opt

Non-Sweep

CAUTION

When a Power Module compartment has been selected for the

(1) Output

Opt

7

GATE

Signal Input Ground Signal Input

clock-In/Clock-Out

-

(Optional

See Notes)

DC

1

502 and wired for a specialized interface system, a plastic barrier (Tektronix Part Number

contacts

22

224-1593-02)

and

22

on the Power Module.

should be installed in a key slot between

See Notes

REV

Do

not insert any

TM

500

Series plug-in in a live Power Module and

do not use excessive force when inserting the plug-in.

B,

OCT

1978

Digital Counters-Rear Interface Data Book

DC

502 Option

7

Option 7 (Contacts

These contacts are factory wired for a DC

DC

502

Option 7 is an Option 1 instrument to which an additional logic

circuit board has been added plus some circuit modifications. The DC

18A, 188, 17B, 16B, 15B,

502

and

14B)

Option 7 instrument. The

502

Option 7 was designed to operate with a spectrum analyzer and a tracking generator to provide an accurate readout of the spectrum analyzer's center frequency. When the DC this system it must be installed in a specific compartment of a Series Option

502

DC

Digital Counter and TR

--

7

Power Module. Refer to the instruction manuals for the

502

Option 7 instrument is used with

TM

502

Tracking Generator for more information.

500-

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

Plug-In or Power Module Rear View

DC

503

ASSIGNMENTS

FUNCTION CONTACTS

Opt 4 Decimal Point

Opt

4

Decimal Point

Remote Start

Internal Scan Clock Out

External Scan Clock In

Overflow Out/Overflow Display Disable In

BCD

(2)

BCB

(8)

Data Good

Opt

4

Decimal Point

Channel B Input

Channel

Opt

4 4

B

Input Ground

Decimal Point Decimal Point (D5)

(Dl)

(~2)

Output Output

(D3)

(~4)

288

26B

-1

-4

ASSIGNMENTS

CONTACTS FUNCTION

1-

28A

Internal Scan Clock Disable

26A

25A

-

24A

20A

19A 18A

E

16A

15* 14A

Reset, In/Out

Time Slot Zero

BCD

(4)

Output

BCD

(1)

Output

7A

Channel A Input Ground Channel A Input

Opt 4 Decimal Point

1

MHz

Clock Out

(TSfl)

(~6)

REV

CAUTION

When a Power ModuZe conpartment has been se Zected for the

a

p

wired for a specialized interface system, Part Number

contacts

Do not insert any

do not use excessive force when inserting the plug-in.

A,

JUN

1978

214-1593-021

21

and

22

should be installed in a key slot between

on the Power ~odule,

TM

500

Series plug-in in a live Power Module and

Zas tic barrier (Tektronix

DC

503

and

Digital Counters-Rear Interface Data Book

DC

503

INTERFACE

BCD

Outputs

Contacts 20B, Module interface. serial-by-decimal digit sequence. The decimal digit sequence

to right levels for each decimal digit use positive-true logic

Each output data line

Decimal

There are

from left to right in the readout. dependent on the positions of two front-panel switches (FUNCTION and N/CLOCK

UTE)

Decimal point output data

4

front-panel decimal point

.

instrument.

(8,4,2,1

(MSD

20A,

to

Code)

21B, and 19A provide

The count (front-panel display)

LSD

as observed on the front-panel readout).

is

capable of driving 6 TTL loads

Point Output Data

six

decimal points associated with the frant-panel display, numbered

A

rear contact

is

factory wired to rear contacts only for an Option

is

active.

NOTES

BCD

data directly to the Power

is

transmitted in

is

from left

The binary

(HI

=

1,

LO

=

0).

(10

mA).

An

active decimal point location

at a TTL low level when the associated

is

4,

To obtain decimal point output data for instruments other than Option unit can

instructions included with Product Modification 040-0713-00.

Data

A

positive-true Data Good pulse at each updating of the minimum of 0.2 microseconds to a maximum of 1.5 microseconds, dependent on

the clock option. of the Data Good pulse. internal gate time selected by the FUNCTION or N/CLOCK rate switches

(dependent on the operating mode). as long as the FUlJCTION switch positions. This output will drive at least 6 TTL loads.

Reset input/Output (Contact

The counter

accomplished when the front-panel switch during an automatic power-up reset period. when

be

hard-wired by performing the decimal modification section of the

Good Output (Contact

DC

The storage register

The

is

cleared to zero when a

is

between detent positions.

the

DC

503

internal circuitry clears itself for another count.

19B)

is

transmitted directly to rear contact 19B

503

storage register.

is

Ilata Good pulse goes

Contact 19B also goes

is

in either the TIME

26A)

LO

is

RESET

button

Contact

Kit,

updated on the positive-going edge

appled to contact

is

26A

This contact does not go LO

Tektronix.Part Number

Pulse duration

HI

immediately after an

HI

MANUAL

or TOTALIZE

is

and remains

26A.

pushed, or when the FUNCTION

also goes LO momentarily

a

from a

HI

A

This

is

To use

6-20

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

503

26A as a Reset Input function, contact closure to ground, or capable of sinking 15

Scan

A

microseconds for Internal Scan Clock signal). Using the Internal Scan

Clock

Contacts 24B/25~ are hard-wired together at the rear edge connectors.

2

kHz

contacts as long as contact 27A (~nternal Scan Clock Disable)

LO

applied to contact 27A allows contacts 24B/25B to be used as an

External Scan Clock Input. The decimal digits are scanned from

panel display), with the rising edge of each Scan Clock period selecting the decimal digit to be displayed. The binary levels for a selected digit remain on the

Clock signal cycle. portion of the Internal Scan Clock period.

risetime of an External Scan Clock signal applied directly to 24B/25B

The should toggling a divide by period changes the time-slot duration and the time of one complete display scanning cycle. to

the

Scan Clock, has no TS-1 through TS-7 output to the rear interface.

Output/Input and Disable (Contacts 24B/25B and

(square wave) Internal Scan Clock signal

BCD

it

takes about 4 milliseconds for one complete display scanning

The ideal time to read (decode) the

be

less than 100 nanoseconds. Signal inversion does not occur before

time-ladder diagram for waveform relationships between the Internal

TS@

pulse, and Internal Scan Clock Disable pulse. The

mA,

output lines

8

counter circuit. Note that changing a Scan Clock

Maximum External Scan Clock frequency

it

can be set to a

LO

driven

by an open-collector logic gate

LO

by an external switch

27A)

is

applied to these two

MSD

to LSD (as observed on the front-

for one complete Scan Clock period

BCD

data

is

during the negative

is

1

MHz.

is

held

(500

Refer

DC

A

HI.

503

REV

Time

Time Slot Zero (TS~) on rear contact has a duration equal to a Scan Clock period and occurs once per complete display scanning cycle. TS@ data to appear on the significant digit during TS-1. pulse for external equipment.

Overflow and Leading

Rear contact an overflow condition,

A,

JUN

Slot Zero (Contact 25A)

BCD

Zero

23B

goes

LO

1978

25A

is

a pulse which predicts that the next

output lines

This pulse can be used as a synchronizing

will

Suppression (Contact

and

HI

and about a 3 Rz rate when the

A

LO

corresponds

to "display blanked" and

a TTL negative-going pulse that

be equivalent to the most

23B)

DC

503

HI

BCD

is

in

Digital Counters-Rear Interface Data Book

DC

503

corresponds to "display on". front-panel display. When the display LO

1

MHz

will

exist during periods of leading zero suppression.

Clock

Out/Clock

In

23B

can be driven

(contact 14A)

LO

externally to blank the

is

not in an overflow condition a

Rear contact 14A can be used as a contact 17A as a reference ground. When contact 14A Clock In function, remove U250 from the circuit board (standard instrument), or remove

Signal Inputs (Contacts 16A

Rear contact 16A ground. When for counter operation, the appropriate channel must be selected by the frontpanel SOURCE switches. nominal interface.

50

Q

resistors may be lifted.

push-pull input-output switches at the front panel.

Remote Start (Contact 26B)

Grounding this contact terminates the measurement interval gate when operating in the TIME

IN

START

to function. This contact represents one TTL load

an appropriate active device.

U251 for an Option

is

17B

is

assigned for Channel B input, with 16B

it

is

desired to apply input signals to these rear interface contacts

50

ohm load impedance to match coaxial-cable connections to the rear

For high impedance

OUT

STOP switch must be in the START position for this contact

and

assigned for Channel A input, with

The internal signal inputs are terminated into a

MANUAL

1

MHz

1

instrument.

Clock 0ut/clock

In

function.

is

used as a more accurate

17B)

17A

its

reference

its

reference ground.

(~MQ)

The resistors are physically located at the

or TOTALIZE

rear inputs, one end

A

functions.

The front panel

and

can be switched by

of

either or both

Use

REV

A,

JUN

1978

Plug-In or Power Module Rear View

ASSIGNMENTS ASSIGNMENTS

FUNCTION CONTACTS CONTACTS FUNCTION

Gate Out (Also see Notes) Decimal Point Scanned Out27B

28B

Digital Counters-Rear Interface Data Book

DC

504

-

28~

+

1-

-

Count

27A 26A

Reset ~nput/~utput

oldo off

Input

Int Scan Clock Output Overflow Output

BCD

(2)

Output

BCD

(8)

Output

Data Good (Latch) Output

25B 25A

24A 23A

-

22A 21A

20A

19A 18A

17A

16A 15A

22B

20B

19B-

17B

16B 15E

--,

-

TS-1 (MSD) Digit Select Output TS-2 Digit Select Output

TS-3 Digit Select Output TS-4 Digit Select Output

TS-5 (LSD) Digit Select Output

BCD

(4)

Output

BCD

(1) Output

Internal Input Ground Internal Signal Input

REV

A,

CAUTION

When a Power Module compartment has been selected for the

and wired for a specialized interface system, a plastic barrier

(Tektronix Part hmber 214-1593-02) should be installed in

22

slot between contacts 21 and Do not insert any TM 500 Series plug-in in a live Power ~odule and

do not use excessive force when inserting the plug-in.

JUN

1978

on the Power Module.

DC

a

504

key

Digital Counters-Rear Interface Data Book

DC

504

INTERFACE

BCD

Output

These contacts provide Module interface. The count (front-panel display)

serial-by-decimal digit sequences. The decimal digit sequence

from left to right (MSD to LSD as observed on the front-panel display). The binary levels for each decimal digit use positive-true logic LO

=

0).

Decimal Point Scanned

Three decimal points are numbered from left to right in the front-panel display.

(made active) during remains has been scanned. switch function),

a

LO

level.

Data (contacts

Each output data line

20B,

BCD

data (8,4,2,1 code) directly to the Power

Output

A

decimal point to the left of a selected digit

its

particular

HI

for one Scan Clock period to indicate that a decimal point

When the

the decimal points are not active and 27B remains at

This data line

NOTES

20A,

is

capable of driving 6 TTL loads (10

(Contact

DC

504

will

drive 24 TTL loads

21B,

and

278)

time

slot.

is

used in the

19~)

is

Contact

RPM

(38

transmitted in

is

(HI

is

scanned

27B

goes

HI

mode (internal

mA).

=

mA).

and

1,

Digit Select Outputs (Contacts

These output lines provide positive-going time-slot pulses TS-1 (MsD)

through TS-5 (LSD) to the rear interface. the front-panel decimal digits from left to right.

pulse duration

seconds). on the

(6.4

Scan

This output line provides a square-wave signal of about 4 kHz to the

rear interface. on each rising edge of the Scan Clock waveform. read (decode) the falling edge of the Scan Clock signal.

Manual for waveform relationships.

only

BCD

mA).

Clock

1

TTL load (1.6

is

equal to one Scan Clock period (about 0.25

is

There output lines.

Output

no

(Contact

A

different front-panel digit

BCD

output data for a selected digit

mA)

TS~

Each Digit Select line will drive

.

25A

through

pulse that occurs before the

21A)

The time-slot pulses scan

Each time-slot

24B)

is

selected to be displayed

A

ideal time to externally

Refer to the

This output data line will drive

DC

milli-

MSD

data appears

4

TTL loads

is

on each

504 Instruction

REV

A,

JUN

1978

Data

Good Output (Contact 19B)

Digital Counters-Rear Interface Data Book

DC

504

This output line provides a positive Data Good

interface. The pulse duration as each updating mode (internal switch function), contact 19B remains

selected measurement interval. This data line will drive 10 TTL loads

mA).

(16

of

the display storage register.

is

about 10 microseconds and occurs

(~atch)

pulse to the rear

In a Latch Override

HI

during a

Overflow Output (Contact 23B)

Contact

counter

time

will

Reset

The counter

accomplished from the front-panel by pushing the

the FUNCTION switch between detents.

will

power-up reset, when the counter prepares itself for operation.

does not go low when the internal circuitry clears itself for another

count

23B

is

normally at a LO level and goes

is

in an overflow condition. Contact

that

drive 8 TTL loads (12.8

the

front-panel

OVERFLOW

Input/Output (Contact

is

cleared to zero when a

drive 6 TTL loads (10

.

mA).

26A)

mA).

HI

to indicate that the

23B

is

at a

HI

light

26A

is

on.

LO

is

applied to

When used as an output, this line

also goes LO momentarily during

This output data line

26A.

RESET

button or setting

level any

This

is

26A.

When contact must be able to drive

sinking

15

26A

is

mA

can be used.

used as a Reset Input function, the external circuit

9

TTL loads; a discrete transistor capable of

Gate Out/TOTALIZE Stop (Contact 28B)

Contact 28B has Two assignments.

It

1.

2.

provides a Gate Out signal that an internal gate the decade counter units). This output line loads

When the

pulled as an input line, the external circuitry must be capable of sinking transistor without a pull-up resistor 28B to a LO.

(9

mA).

DC

504

LO

to inhibit the gate (stop the counting).

5

mA

(3

is

open (while an input signal

is

operated in the TOTALIZE mode, 28B can be

TTL).

Open-collector logic or a discrete

is

HI

during the time that

is

gated into

will

is

recommended to set

drive 5 TTL

When used

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

504

If contact

will

mined

Your external circuit to 28A must be able to drive 3 TTL loads

stop and the front-panel display

by

gate to remain open

Count

This input line drives

TTL

into a hold mode. The counter take another count only after the switch

Holdoff Input (Contact

logic gate. The application

Internal Signal Input (Contacts 16A and

Input signals can be applied through the rear interface via contact 16A,

with 17A serving as a ground reference (coaxial-cable shield connection).

To select input signals via contact lGA,set the front-panel SOURCE switch to the dependent upon the selected position of an internal switch.

is

terminated with a nominal 50-ohm load impedance.

to convert the input impedance to

28B

is

pulled

the DISPLAY TIME control. Forcing

LO

in any mode other than

in

all operating modes.

will

go to zero after a time deter-

28B

28A)

the base of a transistor and one input line to a

of

a

HI

level to 28A forces the

will

is

rotated, or when the Count Holdoff signal to

hold the latest measurement and

RESET

button

is

17A)

INT

position. The input signals are dc or ac coupled,

1

Mil,

if desired.

TOTALIZE,

to a

HI

pushed,

RlOO

the counting

causes the internal

DC

504

will

the

FUNCTION

28A

goes

LO.

a an

In).

Contact 16A

can 'be removed

External Clock Input (Contact

An

External Clock signal can be

by

applying the input to shield. Int/Ext switch to the between the solder pads marked

The External Clock input recommended that the positive portion of this input signal have a duty cycle of at least 15%, but not more than 70%. Refer to the Instruction Manual for more information. connection to any rear contact to provide a

To use the External Clock signal, set the internally located

14A

EXT

is

14A

and

17A)

used

and using

position and use a shielded cable

EO

somewhat duty-cycle sensitive.

instead of

17A

to ground a coaxial-cable

on the circuit board.

At

the internal

present, there

1

MHz

Clock signal output.

1

MHz

clock

to connect

It

is

DC

504

is

no direct

REV

A,

JUN

1978

Plug-In or Power Module Rear View

ASSIGNMENTS ASSIGNMENTS

FUNCTION

Opt

4

Decimal

Manual Start/Stop

Internal Scan Clock

Point

(Dl)

Out

CONTACTS

27~

4

)-

27A

-

26~

25~

-

24A

Digital Counters-Rear Interface Data Book

DC 5051DC 505A

FUNCTION

Internal Scan Clock Disable Reset Input/Output

Time Slot Zero

(TsP))

Overflow

BCD

(2)

BCD

(8)

Data Good

Opt

4

Decimal Point (~2)

$

Channel B Signal Input

'<

Opt Opt

Channel B Ground

4

Decimal Point (~3)

4

Decimal Point (D4)

Output

I~B

23A

22~

21A

20A

19A 18A

c-

17A

-

16A 15A

14A

Trigger Level

BCD

(4)

Output

BCD

(1)

Output

Channel A Ground Channel A Input

Opt

4

Decimal Point (D5)

1

MHz

Clock

Out

Out/Ext

.

Clock Input

REV

A,

JUN

1978

CAUTION

When a Power Module compartment has been selected for the

DC

505

and wired for a specialized interface system,

a

plastic barrier

should be installed in a key slot between contacts 22

and 22 on the Power Module, Do not insert any

Module and do not use excessive force when inserting

the plug-in,

(Tektronix Part Nwnber

lM

500

Series plug-in in a live Power

214-1

593-

02)

Digital Counters-Rear Interface Data Book

DC 505lDC 505A

INTERFACE

BCD

Outputs

Contacts 20B, 20A, 21B, and 19A provide interface. The count (front-panel display) digit sequence. observed on the front-panel readouti). The binary levels for each decimal digit use positive-true logic (HI driving

Decimal

There are five decimal points associated with the front-panel display, dependent upon the position of the front-panel controls (see Instruction Manual). An active decimal point location panel readout.

Decimal point output data Option front-panel decimal point

4

(8,4,2,1

6

TTL

loads (10,mA).

Point Output

instrument.

Code)

The decimal digit sequence

Data

A

=

1,

is

factory wired to the rear contacts only for an

rear contact

is

active.

NOTES

BCD

data directly to the Power Module is

transmitted in serial-by-decimal

is

from left to right (MSD to LSD ad

LO = 0). Each output data line

numbered from left to right in the front-

is

at

a

TTL LO level when the associated

is

capable of

To obtain decimal point output data for instruments other than Option can be user wired instructions included with Product Modification

040-0713-00.

Data

A

updating of the

minimum of

the clock option. the Data Good pulse.

time

remains

Reset

The accomplished when the front-panel RESET button

switch

up reset period.

circuitry clears itself for another

an open-collector logic gate capable of sinking 15

Good

Output

positive-true Data Good pulse

0,2

as selected by the front-panel controls.

HI

as long as the

Input/Output (Contact

set

counter

it

is

between detents.

to a LO by an external switch closure to ground, or drive

by

performing the decimal point modification section of

Kit,

Tektronix Part Number

(Contact

DC

5Q5/Dc 5Q5A

microseconds to a maximum of 1.5 microseconds, dependent upon

The storage register

19B)

is

transmitted directly to contact 19B at each

storage register.

Contact 19B goes

DC

505/DC.505A

Pulse duration

is

updated on the positive going edge of

HI

immediately after an internal gate

Contact 19B also goes

is

operated in the TOTALIZE A mode.

is

26A)

cleared to zero when

Contact

This contact does not go LO when the

a

LO

is

applied to contact

is

pushed, or when the FUNCTION

26A

also goes LO momentarily during a power-

DC

505/DC 505A internal

taunt.

To use

26A

as a Reset Input function,

mA.

26A.

it

4,

from a

HI

and

This

LO

by

a unit

the

is

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC 505lDC 505A

Int Scan Clock Output/Int Scan Clock Disable (Contacts

Contacts 24B/25B are hard wired together

In Scan Clock signal

27A (~nt Scan Clock disable the apply an External Scan Clock signal to 24~/25~ when disabling the Int Scan Clock.

The decimal digits are scanned from MSD to LSD (as observed on the front-panel

display), with the rising edge of each Scan Clock period selecting the decimal digit to be displayed.

BCD

output lines for one complete Scan Clock period (500 microseconds). An ideal portion of the Internal Scan Clock period.

time

Irit

Scan Clock circuit.

to externally read

Time Slot Zero (Contact

Time Slot Zero has a duration equal to a Scan Clock period and occurs once per complete display

scanning cycle. on the

TS-1. This pulse can be used as a synchronizing pulse for external equipment.

BCD

(TSO)

output lines

(2 kHz square wave)

is able)

The binary levels for a selected digit remain on the

is

(decode) the

25A)

on rear contact 25A

is

TS@

a pulse which predicts that the next

will

be equivalent to the most significant digit during

held

at is

HI

(or open).

At

present,

is

the rear edge connectors. The present on 24B/25B as long as

it

BCD

data

a TTL negative-going pulse that

24B/25B

A

LO

applied to 27A

is

not recommended to

is

during the negative

and

BCD

data to appear

27A)

will

Overflow and Leading Zero Suppression (contact

Rear contact 23B rate when the

23'8

on". digits). during periods

1

MHz

An internal switch position determines whether contact 14A provides a 1 MHz

Clock Output or

coaxial

shield ground).

can be driven

When the display

Clock

Out/Ext

cable

Signal Inputs (Contacts

Selection of Channel A (16A) or Channel B (17B) signal inputs are controlled by front-panel LEVEL/SOURCE switches.

terface are terminated into a nominal 50-ohm load impedance to match coaxial cable connections. connections. R210 or'

1

1152,

if

desired.

is

normally at a

DC

505

is

in an overflow condition.

LO

to completely blank the front-panel display (all

is

of

leading zero suppression.

Clock Input (Contact

is

used as a more accurate Ext Clock Input.

should be used for this connection (using contact 17A as a

16A-17A

Use

contacts 17A and 16B as coaxial-cable shield ground

RlOO

can be removed to convert the input impedance to

HI

level and goes LO and

not in an overflow condition, a LO

14A)

and

17B-16B)

Signals applied through the rear in-

23B)

A

HI

at about a

LO

corresponds to ''display

will

exist

In either case,

3

Hz

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC 505lDC 505A

Manual

Contact

will

and used in the TOTALIZE

not locked out and

-

variety of erroneous

Trigger

This contact has a dc voltage range (-2 V to +2

(with a panel switch determines whether the dc output on contact or does not have this feature, you can

Modification

Start/Stop (Contact

26B

is

normally at a TTL

open an internal gate to allow counting. Contact

if

a

26B)

HI

level.

A

mode only. In other modes of operation,

LO

applied for thesemodes; the result

is

A

TTL

displays.

CH

Level

DVM)

B.

Out

(Contact

the triggering level of signals applied to

For the

Kit

DC

505A this output

Number 040-0757-02.

22A)

is

order

V)

factory wired. For a

and install a Trigger Level Out

LO

applied to this contact

which allows monitoring

26B

should be wired

CH

A

or

CH

22A

is

for

DC

26B

is

will

be a

B.

A

CH

A

505 that

front-

REV

6,

OCT

1978

Digital Counters-Rear Interface Data Book

DC

508

Plug-In

ASS1

FUNCTION

Gate Output

Decimal Point Scanned Output

Internal Scan Clock Output

Overflow Output 238-

BCD (2) Output

BCD

(8) Output

or

GNMENTS

CONTACTS

Power

r

i

288

-1

278

26B

25B

248

21

B

208

-

Module

ASSIGNMENTS

CONTACTS

+-

26A

Reset Input or Output

25A

TS@

23*

Counter Identify Output

22A

21

A

20A

BCD

Rear

Output

(4)

Output

View

FUNCTION

Data Good (Latch) Output 1 9B

Start Count Output

Ctr

Identify Output-+pt.

00 k~z Resolution ~nput--opt.

Sweep Input--Opt.

Source Identify Input-Opt

When a Power Module compartment has been selected for the

a

for 214-1593-02) should be installed in the key slot between contacts 21 and 22 on the Power Module.

Do not insert any TM 500 Series plug-in in a live Power Module and do not use excessive

specialized interface system, a plastic barrier (Tektronix Part Number

forcewhen inserting the plug-in.

.

7 7 7

7

-

188

I

168 !

5E

1

48

CAUTION

BCD

8A

t

-

Gate Output - Opt.

17A

Ground

6A

Direct Input (non prescale)

14A

External Clock Input

(1)

Output

7

DC

508 and wired

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

508

Time Slot Zero Output (contact 25A)

This line provides a reference time indication for proper demultiplexing of the display bcd information. This pulse is negativegoing and equal in width to one scan-clock period. going leading edge is time coincident with the rising edge of the scan-clock line. The next rising edge of the scan-clock line places the first (msd) digit of output lines. This connection will drive five TTL loads

I

NTERFACE

NOTES

bcd information on the four bcd

The negative-

(8

mA).

BCD Output Data (contacts 20B,

These contacts provide bcd data (8, the rear interface. The count (front-panel display) is transmitted in serial-by-decimal digit sequences. quence is from left to right (msd to lsd) as observed on the panel display. The binary levels are positive-true logic. Each output data line is During time slot zero

capable of driving five TTL loads

(TSg), all four bcd lines are high.

ZOA,

21B, and 19A)

4,

2,

1,

code) directly to

The decimal digit se-

(8

front-

mA).

Decimal Point Scanned Output (contact 27B)

A

decimal point to the left of a selected digit is scanned (made active) during its particular time slot. Contact and remains high for one scan-clock period, indicating that a decimal point is scanned. This data line will drive nine TTL loads (15 mA).

27B

goes high

Scan Clock Output (contact 24B)

This output line provides approximately 5 kHz squarewave signal at

A

the rear interface. each rising edge of the scan-clock waveform. from time slot zero (TS~) to the most significant digit, and then through the digits in sequence, succeeding scan clock cycles.

different front-panel digit is displayed on

The display scans

to the least significant digit on

The corresponding bcd information is transferred to the output on each scan-clock positive-going edge. lays, the data should be transferred to external memory on the following negative-going edge of the scan clock signal. line will drive two TTL loads (3.2

To allow for propagation de-

This output

mA).

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

508

Data Good

This output line provides a low data good (latch) pulse. The pulse

duration time and occurs after each updating of the display storage latches.

The accumulated count

is

high and

not be acquired until after the falling edge to avoid errors. This

data line

Overf 1 ow

Contact 23B

that the counter a high level any time that the front-panel OVERFLOW light This output data line

Reset Input-Output (contact

The counter

is

accomplished from the front panel by pushing the RESET button or

moving the RESOLUTION control between detents. When used as an out-

put, this line goes low momentarily during power-up reset, when the counter prepares itself for operation. This contact does not go low when the

internal circuitry clears itself for another count. This output drive two TTL loads (3.2

Output

is

determined by the measurement interval plus the display

is

will

Output

is

(contact

actually latched on the falling edge. Data should

drive one TTL load (1.6 mA).

(contact

normally at a low level and goes high to indicate

is

in an overflow condition. Contact 23B

19B)

is

transferred to the latches when this line

238)

is

will

drive two TTL loads (3.2

mA).

is

26A)

is

cleared to zero when a low

will

drive two TTL loads (3.2

is

applied to 26A. This

mA).

Contact

26A

mA).

at

on.

also

will

REV

A,

JUN

When contact 26A

cuit must be able to drive

24

Out

(8

mA).

mA

(contact

ble of

Gate

This contact provides a gate out signal that

that the internal gate the decade counter units). This output line loads

1978

is

used as a reset input function, the external cir-

can be used.

288)

is

15

TTL loads; a discrete transistor capa-

open (while an input signal

is

high during the time

is

gated into

will

drive five TTL

Digital Counters-Rear Interface Data Book

DC

508

Internal Signal Input (contacts

Direct input signals (non prescaled) can be applied through the

rear interface via contact 16A, with 17A serving as a ground reference (coaxial-cable shield connection). To select direct input signals via contact 16A, depress the front-panel SOURCE switch to the INT position. The input signals are ac coupled. Contact 16A is terminated in a nominal 50

be made using a 50

for maximum bandwidth operation.

R

coaxial cable with leads as short as possible

External Clock Input (contacts

An external clock signal can be used instead of the basic internal

10

MHz

clock by applying the input to 14A and using 17A to ground a coaxial-cable shield. To use the external clock signal, set the internal jumper to the EXT position. The internal frequency selection jumper must be properly placed for 1, 5, or 10

pending on the choice of external clock frequency. nal should be a TTL level signal capable of driving an ac coupled

ki2

load.

1

16A

and

17A)

i2

load impedance. Connections should

14A

and

17A)

MHz

de-

The input sig-

Start Count Input (contact

For instruments without Option measurement cycle by an external trigger signal. When the SOURCE

switch is depressed and a signal is present at the rear interface

(pins 16A and

asserting a high level on contact

made if 18B is pulled low before the gate and display times have

elapsed. If 18B is held high, the counter makes continuous readings. The load is one TTL (1.6

In Option 7 equipped instruments a high on contact 18B starts the

measurement cycle and directly initiates the low level on contact

18A (Gate Output).

Counter Identi

This line goes low when the SOURCE switch is depressed (internal)

for instruments without Option 7. This indicates that the instru-

ment is in the count-on-command mode as explained in the Start Count

Input description. This output provides 16

TTL loads. Contact 23A is disconnected in Option

struments.

17A), a measurement may be started on command by

fy

Output

18B)

7,

(contact

this line initiates the DC

18B. A single measurement is

mA).

23A)

mAy

equivalent to 10

7

equipped in-

508

REV

A,

JUN

1978

Digital Counters-Rear Interface Data Book

DC

Counter Identi fy Output-Option 7 (contact 178)

When this contact is low and the instrument is equipped with Option

7, the counter operates continuously; when high, the instrument counts only when contact

bility is

1.6

mA, equivalent to one TTL load. This contact is not

18B

(Start Count) goes high. Output capa-

wired in instruments without Option 7.

Source Identify Input-Option 7 (contact 148)

When this contact is low, all Option 7 functions are enabled; when

this contact is high, the counter operates normally. This input requires

wired in instruments without Option 7.

4.8

mA, equivalent to three TTL loads. This contact is not

508

Gate Output-Option 7 (antact

18A)

This contact goes low during the measurement interval in instruments

equipped with Option 7. Output capability is

15

mA,

equivalent to nine TTL loads. There is no connection to this contact in instruments without Option 7.

REV

A,

JUN

1978

Section 7-Rear Interface Data Book

DIGITAL DELAY

UNITS

REV

A,

JUN

1978

Digital Delay Units-Rear Interface Data

Book

REV

A,

JUN

1978

Digital Delay Units-Rear Interface Data

DO

Book

501

Plug-In

ASSIGNMENTS

FUNCTION

or

Power

I

CONTACTS

Module

ASSIGNMENTS

CONTACTS

c-

28A

-

27A

+

26A

c-

25A

-

24A

-

23A

-

22A

21A

t

20A

Rear

FUNC7

View

ION

19A

-

18A

-

17A

-

16A

-

15A

14A

-

Each Rear Interface Connection shown has its own through-hole-plated

connection pad.

When a Power Module compartment has been selected for the

wired for a specialized interface system, (Option

(Tektronix Part Nwnber 224-2593-02) should be installed in a key slot

22

between contacts

21 and

on the Power Module.

7)

a plastic barrier

DD

502

and

Do not insert any not use excessive force when inserting the plug-in.

REV

A,

JUN

1978

TM

500 Series plug-in in a live Power ~odule and do

Digital Delay Units-Rear Interface Data

DD

501

DLY'

D

TRIG OUT (Suggestion)

At the present time, no pin assignments are available for the

DD

501. ted to the rear interface, the coaxial cable should be disconnected from the rear of the front-panel bnc connector and a new 50

28B

OUT signal must be terminated into

maintain the risetime and falltime characteristics of the sig-

nal.

If the user desires the

R

coaxial cable routed to contact

(coaxial-cable shield ground). Note that the

Book

I

NTERFACE

NOTES

DLY'D

TRIG OUT signal connec-

27B

(signal out) and

DLY'D

a

50 load in order to

TRIG

EVENTS INPUT (Suggestion)

The EVENTS INPUT can be applied through the rear interface by

24B

using contact Route a new cable from the rear interface to the bnc connector

(EVENTS INPUT) on the front panel.

START INPUT (Suggestion)

The START INPUT can be applied through the rear interface by using contact 21B (signal input) with contact Route a new cable from the rear interface to the bnc connector

(START INPUT) on the front panel.

(signal input) with contact

25B used as ground.

22B

used as ground.

NOTE

Wiring the rear interface and front panel

2

connectors in paraZZe capacitance. The EVENTS

INPUT

have compensation adjustments that

increases the input

IIVPUT

and START

may alter the calibration procedure.

REV

A,

JUN

1978

Digital Delay Units-Rear Interface Data

DL

Book

502

Plug-In

ASSIGNMENTS-

FUNCTION

or

Power

------I

CONTACTS

Module

ASSIGNMENTS

CONTACTS

Rear

View

FUNCTION

At

this printing, the

When a Power Module compartment has been selected for the

for a specialized interface system, a plastic barrier (Tektronix Part Number 214-1593-02) should be installed in a key slot between contacts 24 and 25 on the Power Module.

Do not insert any TM 500 Series plug-in in a live Power Module and do not use excessive force when inser-ting the plug-in.

REV

A,

JUN

1978

DL

502 has no pin assignments for the rear interface.

CAUTION

DL

502 and wired

Section 8-Rear Interface Data Book

DIGITAL METERS

REV

A,

JUN

1978

Digital Meters-Rear Interface Data

Book

NOTES

REV

A,

JUN

1978

Digital Meters-Rear Interface Data

DM

Book

501

Plug-in

FUNCTION

.

Decimal Point, 10 Open Collector, 15

Low Power

BCD

Output, Serial

Digit, Source 360

Sink 400 Data Transfer,

PA

or

ASSIGNMENTS

Hi

Input

rnA

Sink,

V

Max.

by

PA,

8

6

TTL Loads

Power

28B-(

26B

-

20B-

1

9B

-1

Module

CONTACTS FUNCTION

I

c-

28A

-

26~

-

25A{

-

24A

-

23A

t

?\A

-

20A

-

188

Rear

ASSIGNMENTS

Lo Input

Scan Clock, See Text.

Least Significant Digit,

Source 50

Temp Out 10

Low Power

4

BCD

Digit, Source

I

Sink 400

View

PA,

mV/ C at

Output, Serial

Sink

PA

0

1.1

260

mA

-

5

by

PA,

Max.

mA

Max.

One Output, 10 TTL Loads

Polarity,

When a Power Module compartment has been selected wired for a specialized interface system, a plastic barrier (Tektronix Part Nwnber 224-2593-02) should be instalzed in the key slot between

contacts

may have the key slot between contacts 21 and Do not insert any

do not use excessive force when inserting the plug-in.

REV

A,

JUN

27

1978

1

and

TTL Load

18

on the Power Module.

TM

500 Series plug-in in a live Power Module and

1

5E

7

14~--4

$

CAUTION

f0i3

the

Early production

22.

DM

502

502 's

and

Digital Meters-Rear Interface Data

DM

501

Introduction

Display logic, temperature readout simultaneous with the front panel output and external

Display Details

Book

input are available at the rear interface connector.

The display cant digit and ending with the second most significant digit.

most significant digit and polarity signs are not scanned in time

sequence. They are determined when the count latches and are not updated until the next data transfer. display numbers from 0 through cant digit.

is

sign

most significant digit have

segments are driven from a

BCD

data

is

sequentially scanned starting with the least signifi-

9

with the exception of the most signifi-

1

This digit displays either a

also included within this digit module.

similar

BCD

is

available at the rear interface connector.

segments connected together.

to seven segment decoder driver.

or 0.

is

transferred to the

All

The plus or minus

All

digits except the

The

digits

Buffering Output Terminal s

The assignments diagram

terminal the load requirements.

per chip may suffice.

as a CD4050. a transistor such as the 2N2222A.

is

capable of driving. Buffers may be required depending on

If buffering

lists

A

For a non-inverted output use a CMOS buffer such

the loads each rear interface output

74L04 low power TTL chip with six inverters

is

required on only one output line, use

These

The

Assignments Description

Hi

and Lo Input (28B and 28A). When the front panel INPUT switch

pushed in, the

to the rear interface connections. These contacts are floating. Maxi-

mum voltage on either input should not exceed 350

Decimal Point (27B). This terminal connects directly to the collector of 4340. This terminal is

high when the displayed digit requires a decimal point to

Scan Clock (26A). throught the digit sequence as described earlier. See Fig. 2. Buffer this output with a non-loading device (CMOS).

HI

and LO inputs are transferred from the front panel

V

measured from ground.

kC2

Connect a 5.1

is

This

a 4 kHz signal used to step the display

resistor from this pin to +5

its

is

V.

left.

REV

A,

JUN

1978

Digital Meters-Rear Interface Data

DM

Book

501

Least Significant Digit (25A).

BCD

on the

BCD

Output Lines (19A, 20A, 20B, 21B). These lines present the data

lines applies to the least significant digit.

This terminal goes high when the data

in bit parallel character serial fashion.

Data Transfer (19B). This line goes high when the count accumulated in the cascaded counters transfers to the five 4-bit latches. The first lsd pulse (high) after Data Transfer goes low may be used to start the display sequence.

One Output (15B).

This line goes low when the

1

in the msd module

illuminated.

Polarity (14B).

This connection

is

low when the vertical bars in the

polarity sign are illuminated.

Temperature Readout (24A and 24B Ground). These connections are in parallel with the front panel TEMP

is

able

10 m~/degree.

OUT

terminals.

The voltage avail-

is

REV

A,

JUN

1978

+-

(SCAN DIRECTION)

FIG.

1

,-0

Digital Meters-Rear Interface Data

DM

501

Book

(old BCD data present)

I

DATA TRANSFER SIGNAL

U330

Pin No's (11 & 20) SCAN CLOCK (2.5 pS wide every 250 ,US)

-

.-

-

I

(8)

(7)

(17!

(22)

(21)

ENABLE LSD

I

1

I

1

I

I I

I

_I

-

I

>

1

I

6

ENABLE

(this pulse not actually used)

DIGIT 1 DRIVE (1 off)

4

CL

I

ENABLE 3

I

I I

I

a

I

(

I

I I

I

-

7

L

(new BCD data present)

Fall occurs when count is complete.

-

I

1

I

ENABLE 2

(1 on) From Pin 6 U320A via 18 U330

I

1

I

ENABLE 1

#

LC

i

I

ENABLE LSD

I

n

w

d

I

,

I

-

I

r

-\

FIG.

2

REV

A,

JUN

1978

CLOCK

ZNZZZZH

-,-

OR

sf4

LSD

*-p-

74L04

DECIMAL

POINT

Digital

SUGGESTED DATA INTERFACE FOR DM

-

5.1K

0

Meters-Rear Interface

501

7493p

EL

Data

Book

DM

501

DATA

READY

DECl MAL POI

N7

FIG.

3

BCD "1"

BCD "2"

BCD

BCD "8"

'5

-

''

-

BCD

1

I

ooooooooooooooooeooeooe~moooooooooooooooo

:

OUTPUT

a

TERMINAL

DEFGH

(ABC

outputs not used)

ASSIGiV'NTS

REV

Registers are cleared when "STORE

"STORE DATA" goes

high.

A,

JUN

1978

low.

Valid Data is available when

NOTES

DATA"

is high.

Storage begins when

"DATA

READYrr goes

Digital Meters-Rear Interface Data

Book

NOTES

REV

A,

JUN

1978

Digital Meters-Rear Interface Data

DM

Book

502

Plug-In

ASS1

GNMENTS

FUNCTION

Hi

Input

*(H) Decimal Out

Digit

i

Temp Output Gnd (chassis)

*(H) MSD Out

*

(H)

2nd SD Out

*(H)

BCD

*

(H)

BCD

Out 2 Out

or

Power

CONTACTS

8

Module

ASSIGNMENTS

CONTACTS

c-

28A

-

27A

-26A

c-

25A

c-

24A

t

23A

-

22A

t

20A

Lo Input Floating Common (all Data Outputs)

3rd

LSD Out

Temp

BCD

Rear

SD Out (H)*

Output

Out 4 (H)*

View

F-UNCTION

(H)*

Select

-

19~

*(H=+)

*Optional

using them to drive external inputs. Letter in

When a Power Module compartment has been selected for the wired for a specialized interface system, a plastic barrier (Tektronix Part Nwllber 224-2593-02) should be installed in the key slot between contacts

Polarity Out

-

see Interface Notes. These outputs must be buffered before

CAUTION

27

and

28

on the Power Module.

BCD

Out 1 (H)*

(

)

indicates active level.

DM

502 and

REV

Do not insert any not use excessive force when inserting the plug-in.

A,

JUN

1978

TM

500

Series plug-in in a Live Power Module and do

Digital Meters-Rear Interface Data

DM

502

Book

INTERFACE

NOTES

General

The

HI

Input (contact 28B), LO Input (contact 28A), Temp Output (contact

-

24A), and Temp Output Gnd (contact 24B

DM

502 input/output functions that are factory wired to the rear-interface

contacts. Tf

module interface the connections to the rear-interface contacts must be

user wired. Suggested instructions for obtaining digital data from the

DM

502

is

HI Input and

Measurement signals, except temperature

directly through the rear interface contacts. Comparisons can be made between front panel and rear interface measurement sources by using the EXT-INT pushbutton switch on the front panel of the

When using the rear interface

from earth ground (dc plus peak ac) should not exceed 350 volts, or +50 dBm in the dB mode.

dependent on the position of the front-panel range/function switch (type of measurement being made). For further details related to input pedance and input limitations refer to the Electrical Specifications section of the

it

is

desired to transmit digital data through the power

included in these Interface Notes.

LO

Input (Contacts

DM

502.

The impedance between the

DM

502 instruction manual.

28B

and

HI

and LO contacts, the maximum deviation

chassis ground) are the only

28A)

(TEMP

(28B) and LO (28A) circuit board

PROBE), can be applied

HI

and LO contacts

is

im-

Temp

Output

These contacts can be used to monitor a dc voltage proportional to

temperature measurements when using a P6430 probe connected to the

front-panel TEMP PROBE input connector. The output impedance at contact

is

24A from this point. Sensitivity (for a properly calibrated system) 10 by

(2

ed on the

If

ture while using the front-panel rangelfunction control to perform other

measurement functions, the user can modify the internal circuitry in

the following manner (refer to Fig. 1):

quite low and a 10,000 to 20,000

~v/'c

a

front-panel switch and

volts maximum)

it

is

and Temp

or 10

desired to monitor the dc voltage (at 24A) related to tempera-

~v/OF.

DM

502 front panel.

Output

In normal operation

is

directly related to the temperature value display-

Gnd (Contacts

the dc voltage measured on contact 24A

24A

and

248)

Q/v

meter can be driven directly

0

C

or

OF

mode

is

selected

is

REV

A,

JUN

1978

Digital Meters-Rear Interface Data

DM

Book

502

1.

For monitoring in the C mode, disconnect either end of R285.

2. For monitoring in the F mode, connect a jumper

wire

between the center terminal of potentiometer

R268 (OF) and the solder pad as shown.

The

DM

502 Option 2 instrument does not have the temperature measure-

ment or monitoring capability and contact 24A for an Option 2 instru-

is

ment

grounded to the chassis.

0

Digital Data Output (Optional Contacts)

The

DM

502 front-panel readout

segment

with the least significant digit (LSD) at the extreme right of the

display. The digits are numbered the LSD being digit

The internal circuitry for the 1, 2, and then digit

2,

LED&.

3,

4 sequence. The scan sequence

The most significant digit (MSD)

1

and the MSD being digit 4.

4

(MSD) for one complete scan of all the digits.

is

a

3%

digit display using four seven-

1,

2,

3,

4

DM

502 does not scan

is

digit 1 (LSD), digit

is

at the extreme left

(from right to left) with

the

digits in a

3,

digit

In order to obtain digital data through the rear interface, the optional contacts must be user wired to specific data points on the

2

cuit board.

the solder pad connections for the rear-interface contacts.

All

Refer to Fig.

digital data outputs and the

(front and rear) of the

floating common (contact

If

to Fig.

2.

the data outputs are wired to a periph-

for the specific data point locations and

CAUTION

LO

input terminaZs

DM

502

is referenced to a

27A)

when wired according

DM

502 cir-

eral instrument with a chassis ground reference, the

DM

502

circuitry must also be referenced to chassis

If

the

DM

502

ground.

little as

0.2

volts away from chassis ground, the re-

circuitry is left floating as

sult is a possibZe loss of data and just a few volts

DM

502

more than this can result in damage to the

DM

502

the peripheral instrument.

The

floating common

and

can be referenced to chassis ground by connecting a

LO

jumper between the

and chassis ground terminaZs

on the front panel.

If the

puts (signal lines) must be buffered to prevent excessive loading on

the illustrated in Fig. 2. 2 - 4) remains the same as the front panel scan sequence. When using

the transistor type of buffer circuit the

put logic level format

DM

502

is

DM

502 data lines.

user wired according to Fig. 2 the digital data out-

A

typical transistor buffer circuit

Note that the digit scan sequence

BCD

and Digit Select out-

is

changed from active high true to active

(1

is

-

also

3

-

REV

A,

JUN

1978

Digital Meters-Rear Interface Data

DM

502

low true. The output logic level format for the Transfer signal line

is

(contact 19B) require a buffer circuit of opposite polarity than the circuit suggested in Fig. 2. drive additional inverter circuits

format as the

It

is

not recommended that TTL devices be connected directly to the digital data lines at the rear interface. face alternatives should include low current load devices such as

CMOS,

or the isolation circuitry similar to that shown in Fig. 3.

When

any

it

might be necessary to perform Step 3 of the Internu2

true in the low state and this signal line might

DM

502.

DM

Adjustment Procedure in order to AGust Integrator Zero. Refer to the

The isolation circuitry shown in Fig. 3 performs two major functions.

It

allows digital data to be transmitted through the rear interface

when the

specified limitations, 3 - 2 on an auxiliary board mounted on the cam switch. If this connect the specific data points to the input of the isolators and the output terminals to the designated rear-interface contacts. The output signal lines are TTL compatible. so that the outputs of the isolators are not loaded. The circuit requires two quad-nand-gates, one hex-inverter, on CA3083 transistor packages and ten optical isolators. When connecting the

mixed between the isolator and driver circuits and that the substrate

for each package

DM

502

is

-

4

to a

CA3083 transistors be certain that the transistor packages are not

1

-

is

Book

It

is

suggested that the transistor buffer circuits

to retain the same logic level

As

a result, external inter-

NOTE

502

interface system has been completed,

DM

502

instruction manual.

floated above ground (chassis) reference, within

and changes the digit scan sequence from

2 - 3

-

tied to

4

sequence. This circuit could be built

All

of the

its

individual signal ground reference.

Ic's

should be CMOS devices

J-K

flip-flop, four

is

1

done,

-

A

time-ladder diagram for the circuit illustrated in Fig. 3

DM

in Fig. 4. Note that the

0.4

ms

duration with the

being approximately 1.56

sequence by enabling one pair of the nand gates for digits for one gates for digits 3 and flip-flop a result, the complete period for the

is

The 3100 even though the numeral for digit

limited to the numeral at the count of 2000 and the numeral 2 or 3 will not appear on the display. By applying a logic low level to the two nand gates for binary

bits

ability to provide valid counts up to 3000 even though the display may

be blinking.

DM

502 scan period and then enabling the other pair of nand

4

is

clocked by the negative-going edge of the MSD pulse.

increased to about 3.12

DM

502 internal circuitry has the ability to count to approximately

1.

4

and 8 during the MSD time slot, the interface circuitry has the

502 Digit Select pulses are approximately

-

3

DM

ms.

during the next

ms.

The

scan period (1

502

The

J-K

DM

502 front-panel display starts blinking

flip-flop changes the digit scan

1 - 2 - 3

DM

502 scan period. The

(MSD) on the front panel

4

- 2 -

-

4

digit select sequence

is

4

sequence)

1

and 2

shown

J-K

is

As

DM

REV

502

A,

JUN

1978

FET

input

jumper position

10

MQ

jumper position

Input

Digital Meters-Rear Interface Data

DM

Connect jumper on reverse side of board as shown to hard wire in

OF

range.

\

Book

502

REV

A,

JUN

1978

dBm jumper

position

FIG.

\

dBV jumper position

1

Digital Meters-Rear Interface Data

DM

502

Book

LOCATIONS FOR USER WIRED

REAR

INTERFACE CONNECTIONS

I.@

,

+,,...

o

,.,,,,

TO 27A FLOATING

COMMON

FIG.

2

FRONT PANEL

-----

IEXT. JUMPER,

1

l

N PUT

2N3565 OR OTHER TRANSISTOR

WITH MINIMUM BETA OR 150

REAR CONTACT

27A WHEN USER

27A WHEN USER WIRED.

WIRED.

6

FLOATING COMMON

TYPICAL BUFFER CIRCUIT FOR REAR CONNECTOR DATA OUTPUTS.

45

V

UP TO 20MA MAY BE USED FORM THE DM 502

SUPPLY.

REV

A,

JUN

1978

BCD DATA FROM

DM 502

BCD

2

7A

2

21B

-

4

20~

-

8

20B

-

DM

I

502

+5v SUPPLY

9

I

SOLATOR

CIRCUIT

B = 2100

i

NIL

I

OR 112 MCT6

Z

I

fi

I

SOLATOR DRIVER

-

l SOLATOR DRIVER 4

;

l SOLATOR DRIVER

Digital Meters-Rear Interface Data Book

-

I

--

A

11'

](UP

J

ALL OUTPUTS

HIGH EXCEPT

'TRANSFER

1

I

ALL GATES CMOS

.

-

r

TO 5 TTL

LOADS)

TRUE

DATA

BCD DATA OUT

MSD

=

1,2, OR

3

DI

GlT

SELECT

LINES

FROM

DM

502

1-3-2-4

SEQUENC

I

DIGIT

26B

I

CI

+33v

MODULE

4

-

,

I

SOLATOR

M SD

DRIVER

J

DIGIT SELECT

LINES OUT

1-2-3-4

SEQUENCE

DECl MAL

REV

TRANSFER

6,

OCT

11

978

-27B

lgB

-

*

1

SOLATOR

I

SOLATOR

5v SUPPLY

*

FIG.

3

DRIVER

-

1

OOK

'

DECl MAL

I

NT

PO

TRANSFER

Digital Meters-Rear Interface Data

DM

Book

502

DIGIT

I

SELECT

DIGIT

2

SELECT

DIGIT

3

SELECT

DIGIT

4

SELECT

ENABLE DIGIT

#

1

DISPLAY

ENABLE DIGIT

#

2

DISPLAY

ENABLE DIGIT

#

3

DISPLAY

ENABLE DIGIT

#4 DISPLAY

J-K

FF

ENABLE DIGITS # 1

-

DISABLE DIGITS

<

-1.56

MS

#

&

#

2

3

&

#

4

DI SABLE DIGITS # 1 ENABLE DIGITS

#

&

#

3

2

&

#

4

'I

+

\

FIG. 4

REV

A,

JUN

1978

Section 9-Rear Interface Data Book

FUNCTION GENERATORS

REV

A,

JUN

1978

Function Generators-Rear Interface Data Book

REV

A,

JUN

1978

Tektronix TM500 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

INTRODUCTION

APPLICATIONS INDEX

DESCRIPTION OF THE APPLICATIONS INDEX

NETWORK ATTENUATION OR GAIN MEASUREMENT

INTEGRATION THROUGH V TO F CONVERSION

MICROVOLTMETER

REFERENCE INFORMATION

INTERFACE COMPATIBILITY

FAMILY BARRIER KEYS

INTERFACING TM 500

THE STANDARD MAINFRAME

THE OPTION 2 MAINFRAMES

QUICK CHANGE INTERFACING

EXTERNAL INTERFACING

THE OPTION 7 MAINFRAMES

SIGNAL PROCESSORS

Amplifier Output

Trigger Output

Introducti on

Making Signal Input and Ground Connections

Plug-in or Power Module Rear View

Impedance Matching

DIGITAL COUNTERS

General Counter Information

GENERALIZED TIME-LADDER DIAGRAM

Plug-In or Power Module Rear View

Plug-In or Power Module Rear View

Plug-In or Power Module Rear View

Remote Start (Contact 26B)

Plug-In or Power Module Rear View

Gate Out/TOTALIZE Stop (Contact 28B)

Plug-In or Power Module Rear View

Time Slot Zero Output (contact 25A)

Decimal Point Scanned Output (contact 27B)

Scan Clock Output (contact 24B)

Counter Identi fy Output-Option 7 (contact 178)

EVENTS INPUT (Suggestion)

START INPUT (Suggestion)

DIGITAL METERS

Introduction

Display Details

Buffering Output Terminal s

Assignments Description

General

Digital Data Output (Optional Contacts)

FIG. 4

FUNCTION GENERATORS