Keithley 775A Manuale utente

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Instra

Instruction Manual

Model 775A

Programmable Counter / Timer

Any unauthorized reproduction, photocopy, or use the information herein, in whole or in part, without the prior written approval

of Keithley Instruments, Inc. is strictly prohibited.

All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments, Inc.

Other brand names are trademarks or registered trademarks of their respective holders.

Cleveland, Ohio, U.S.A.

Document Number: 775-901-01 Rev. B / February 1987

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WARRANTY

Keithley instruments, Inc. warrants this product to be free from defects

in material and workmenship for a period of 1 year from date of ship-

ment. During the warranty period, we will, at our option, either repair

or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley represent-

ative, or contact Keithley headquarters in Cleveland, Ohio. You will be

given prompt assistance and return instructions. Send the instrument,

transportation prepaid, to the indicated service:facility. Repairs will be

made and the instrument returned, transportation prepaid. Repaired

products are warranted for the balance of the original warranty period,

or at least 90 days.

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from unauthorized

modification or misuse of any product or part. This warranty also does

not apply to fuses, batteries, or damage from battery leakage.

This warranty is in lieu of all other warranties, expressed or implied, in-

cluding any implied warranty of merchantability or fitness for a par-

ticular use. Keithley Instruments, Inc. shall not be liable for any indirect,

special or consequential damages.

STATEMENT OF CALIBRATION

This instrument has been inspected and tested in accordance with

specifications published by Keithley Instruments, Inc.

The accuracy and calibration of this instrument are traceable to the

National Bureau of Standards through equipment which is calibrated at

planned intervals by comparison to certified standards maintained in

the Laboratories of Keithley Instruments, Inc.

KEITHLEYINSTRUMENTS,INC.

INSTRUMENTDIVISIONI 29775 Aurora Road / Cleveland. Ohio 44139 / U.S.A. / 1216) 246-0400 / Telex: 99.5469

WESTQERMANY:

Keithley Instruments GmbH / Heiglhofstr. 5 / 6000 Munchen 70 / 10691 710020 / Telex: 52.12160

aREA BRITAIN:Keithlay Instruments, Ltd. / 1, Boulton Road / Reading, Berkshire RG 2 ONL / 10734) 66-l 2.67/66 / Telex: 94.7047

FRANCE Keithlsy Instruments SARL / 2, Bis Rue L&n Blum / 9.P. 60 / 91121 P$laiseau Cedex / 16101 l-51 -55 /Telex: 600-933

NETHERLAND%

Kelthley Instruments BV / Arkelsedijk 4 / Postbus 559 / 4200 AN Gorinchem / 1011930.25577 / Telex: 24-664

SWITZERLAND:

Kelthley Instruments SA / Kriesbachstr. 4 / 9600 Oibendorf / 01/821-94-44 / Telex: 57-536

AUSTRI*:

Keith@ lnatruments Ges.m.b.H. / Doblinger Haupstr. 32 / 1190 Wien / 314 299 / Telex: 13-4500

ITALY:

Kelthley Instruments, SRL / Viale S. Gimignano 4/A / 20100 Milano, Italy / 4120360

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SPECIFICATIONS

INPUT CHARACTERISTICS PERIOD A

Channel A, B; each channel

RANGE:

0 to l20MHz, dc coupled.

30Hz to IZOMHz, ac coupled.

SENSITIVITY (d):

25mV rms, <lOMHz.

50mV rms, > 1OMHz.

RANGE:

Mns to 10” seconds.

LSD DISPLAYED: 1Ons to O.lms.

ACCURACY:

*l LSD *(Time Base Error x Period) f Trigger Error.

PERIOD AVERAGE A

DYNAMIC RANGE (xl): 50mV to 5V pk-pk, <ZOMHz.

14OmV to 2.5V pk-pk, >20MHz.

COUPLING: ac or dc, switchable.

IMPEDANCE: lMR nominal, shunted by <60pF.

ATTENUATOR: xl or xl0 nominal, switchable.

LOW PASS FILTER: -1OdB

1OOkHz nominal, switchable.

SIGNAL OPERATING RANGE (xl): -2.55V dc to t2.55V dc.

TRIGGER LEVEL: -2.55V dc to +2.55V dc, xl.

:25.5V dc to +25.5V dc, x10.

TRIGGER LEVEL RESOLUTION: lGmV, xl.

Mo”v, xx?

RANGE: 1Onsto 10sec.

LSD

DISPLAYED: (10ns x l’eriod)/Gate Time.

RESOLUTION:

fl LSD f (1.4 x Trigger Error + Zns) x Period

Gate Time

ACCURACY:

f Resolution *(Time Base Error x Period)

NUMBER OF PERIODS AVERAGED: Gate Time/Period

TIME INTERVAL A-B

RANGE: 1011sto

lo4 seconds.

LSD DISPLAYED: 1Ons to O.lms.

ACCURACY: fl LSD *(Time Base Error x Time Interval)

f Trigger Error * Trigger Timing Error -t2ns.

TRIGGER LEVEL SElTING ACCURACY:

*(35mV + 2% of setting), xl.

*(35OmV + 2% of setting), x10

TRIGGER LEVEL SETTING OUTPUT: via rear panel BNC,

not adjusted for attenuators.

SLOPE: + or - slope, switchable.

DAMAGE LEVEL:

xl: dc-2kHz 250V dc + peak ac

2kHz-100kHz 5 x 1OsV rms*Hz/frequency

> 1OOkHz

5v rms

x10: dcZOkHz 250V dc + peak ac

20kHz.100kHz 5 x 10%’ rms.Hz/frequency

> 1OOkHz

5oVrms

Channel C (with Model 7751 option)

RANGE: 5OMHz to 1.3GHz.

SENSITIVITY: l5mV, 50MHz to l.OCHz;

25mV, l.OGHz to 1.2GHz;

75mV, 1.2GHz to 1.3GHz

DYNAMIC RANGE: 25mV rms to 1V rms.

COUPLING: ac.

IMPEDANCE: 500.

DAMAGE LEVEL:

dc-100kHz

>.lOOkHz l5V dc + peak ac

5v rms

FREQUENCY A, B

RANGE: O.lHz to l20MHz.

LSD DISPLAYED: (101~sx Frequency)/Cate Time

RESOLUTION:

*l ,.SD -t (1.4 x Trigger Error + 2ns)x Frequency

Gate Time

ACCL RACY:

*Resolution *(Time Base Error x Frequency)

DIGITS DISPLAYED: 8 per second of Gate Time, minimum.

PULSE WIDTH A (Positive or Negative)

RANGE: Mns to lo4 seconds.

LSD DISPLAYED: lOns to O.lms.

ACCURACY: fl LSD *(Time Base Error x Pulse Width)

f Trigger Error f Trigger Timing Error f2ns.

mALIZE A

MODES: Cumulative or A gated by B

RANGE: 0 to lo”-1

REPETITION RATE: lZ0MHz “ax.

LSD DISPLAYED: 1 count up to lOLo-1, then 9 most signifi-

cant digits.

ACCURACY: kl LSD

GATE/DELAY

INTERNAL GATE TIME: Variable from loops to IOsec in 45

increments, or one period of the input, whichever is longer.

May be used in Frequency and Period Average

measurements.

EXTERNAL GATE TIME: Continuously variable from loops

to Klsec, or one period of the input, whichever is longer.

EXTERNAL GATE DELW: 10~s + one period of the

input signal, maximum.

INTERNAL DELAY TIME: Variable from lOO@ to 10s~ in 45

increments. May be used in Period, Time Interval and Pulse

Width measurements.

EXTERNAL DELAY TIME: Continuously variable from loops

to >l hour.

EXTERNAL GATE/DELAY INPUT: Positive TTL signal via

rear panel BNC.

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TIME BASE

FREQUENCY: 1OMH.z.

AGING RATE: 55 x lo-‘/month.

TEMPERATURE: f5 x lo-! 0’ to 40°C, ref 25’C.

TCXO (with Model 7752 option)

FREQUENOI: l!&II-Iz

AGING RATE: <l x IO-‘/month.

TEMPERATURE: *I x 10-q 0 to 4O’C, ref 25’C.

LINB VOITAGE: < 1 x lO-’ for 10% change.

IEEE-488 INTERFACE

MULTILINE COMMANDS: DCL, LLO, SDC, Gm, GTL,

UNT, UNL, SPE, SPD.

UNILINE COMMANDS: IFC, RBN, EOI, SRQ, NN.

INTERFACE FUNCTIONS: SHl, AHl, T6, TEO, IA, LEO, SRl,

PPO, DCl, DTI, CO, El.

PROGRAMMABLE PARAMETERS: AI1 front panel controls

(except POWER) plus Reading Rate, Data Format, Trigger,

EOI, Terminator, Service Request, Self Test, Display, Stahu.

READING RATES: one shot, normal (3/second), fast

(ZYsecond), or dump (14O/second).

GENERAL

DISPLAY:

Nine

LED digits with decimal point and exponent.

BENCH READING RATES: One shot, or normal (3/second).

ARMING nRIGGER): Each channel is armed by it’s own

signal; or RESET button 01EXT ARMING input when in one

shot (HOLD) mode.

ARMING DELAY: 30~ in Frequency and Period Average;

lOas in Period, Tie Interval and Pulse Width.

EXTERNAL ARMING INPUT: positive edge ‘IX signal via

rear panel BNC.

EXTERNAL TIME BASE INPUT: lOMHz ‘ITL signal via rear

panel BNC

TIME BASE,OUT: 2V minimum @ MMHz, 1OODoutput resis-

tance, via rear panel BNC.

GATE: LED ,indicator lights when gate is open.

WARMUP: 2 hours to rated accuracy and stability

OPERATING TEMPERATURE: 0” to 4O”C, 0% to 80% relative

humidity

STORAGE TEMPERATURE: -25” to 65°C.

POWER: lO?-l25V or 2lO-250V (rear panel switch selected),

50-6OHz. 35VA max. 90-1lOV available.

DIMENSIONS, WEIGHT: l27mm high x 2l5mm wide x

359mm deep (5”~ 8’X’x 14r).

Net weight 3.5kg (8 lbs).

Specifications subject to change without notice.

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TABLE OF CONTENTS

SECTION l-GENERAL INFORMATION

1.1 INTRODUCTION. ........................................................................... l-l

1.2 MODEL775 FEATURES...................................................................... l-1

1.3 WARRANTY INFORMATION ................................................................. l-l

1.4 MANUAL ADDENDA ....................................................................... l-1

1.5 SAFETY SYMBOLS AND TERMS ............................................................. l-1

1.6 INSPECTION ............................................................................... l-2

1.7 USING THE MODEL 775 MANUAL .......................................................... l-2

1.8 ACCESSORIES .............................................................................. 1-2

SECTION Z-BASIC COUNTER/TIMER OPERATION

2.1 INTRODUCTION ........................................................................... 2-l

2.2 FRONTI’ANEL FAMILIARIZATICJI’J .......................................................... 2-4

2.2.1 Controls .................................................................................. 2-4

2.2.2 Terminals ................................................................................. 2-5

2.2.3 Display and Indicators ..................................................................... 2-6

2.2.4 TiltBail ................................................................................... 2-6

2.3 REAR PANELFAMILIARIZATION ............................................................ 2-6

2.3.1 Connectors and Terminals .................................................................. 2-6

2.3.2 Line Voltage Selector Switch ................................................................ 2-6

2.3.3 IEEE-488Address Switches ................................................................. 2-6

2.3.4 Line Fuse ................................................................................. 2-6

2.4 POWER-UP PROCEDURE .................................................................... 2-6

2.5 DISPLAYMESSAGES ........................................................................ 2-7

2.5.1 No Option Message ...................................................................... ...2- 7

2.6 CONTROL SELECTION ..................................................................... 2-8

2.6.1 Function .................................................................................. 2-8

2.6.2 Selecting GateTime ....................................................................... 2-8

2.6.3 User Gate Function ........................................................................ 2-9

2.6.4 Using Delay ............................................................................... 2-9

2.6.5 User Delay Function ...................................................................... 2-10

2.6.6 Selecting Measurement Rate ............................................................... 2-10

2.6.7 Selecting the Number of Displayed Digits. .................................................. 2-10

2.6.8 Input Condition Controls Setting., ......................................................... 2-11

2.6.9 Setting Trigger Levels ..................................................................... 2-11

2.7 ARMING.. ................................................................................ 2-12

2.7.1 Continuous Arming....................~ .................................................. 2.12

2.7.2

Front Panel Arming

....................................................................... 2-12

2.7.3 External Arming .......................................................................... 2-13

2.7.4 Alarm Conditions ......................................................................... 2-13

2.8 APPLICATIONS ............................................................................ 2-U

SECTION 3-IEEE-488 OPERATION

3.1 INTRODUCTION .. . .. . . . . . .. . . . . . . . . .. . . . . . . . .. . . . .._..._.................................. 3-l

3.2 BUS DESCRIPTION .. . . .. . . . . .. . . . . . . .._...............................................,,... 3-l

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TABLEOF CONTENTS

3.3

3.3.1

3.3.2

3.3.3

3.4

3.4.1

3.4.2

3.4.3

3.4.4

3.4.5

3.5

3.6

3.6.1

3.6.2

3.6.3

3.7

3.7.1

3.7.2

3.7.3

3.8

3.8.1

3.8.2

3.8.3

3.0.4

3.9

3.9.1

3.9.2

3.9.3

3.9.4

3.9.5

3.9.6

3.9.7

3.9.8

3.10

3.10.1

3.102

3.10.3

3.10.4

3.10.5

3.10.6

3.10.7

3.108

3.10.9

3.10.10

3.10.11

3.10.12

3.1o.u

3.10.14

3.10.15

3.10.16

3.10.17

3.11

3.11.1

3.11.2

3.11.3

3.u.4

3.:A

IEEE-488BUS LINES . . 3-2

Bus Management Lines.. .................................................................. 3-2

HandshakeLines .......................................................................... 3-2

Data Lines ................................................................................ 3-3

BUS COMMANDS .......................................................................... 3-3

Uniline Commands

........................................................................ 3-4

UniversalCommands ...................................................................... 3-4

Addressed Commands ..................................................................... 3-5

Unaddressed Commands .................................................................. 3-5

Device-Dependent Commands .............................................................. 3-5

COMMAND CODES ........................................................................ 3-5

COMMAND SEQUENCE. .............................................. .<................... 3-6

Addressed Command Sequence ............................................................ 3-6

Universal Command Sequence ............................................................. 3-6

Device-Dependent Command Sequence ..................................................... 3-6

HARDWARE CONSIDERATIONS ............................................................ 3-6

Typical Controlled Systems. ................................................................ 3-6 1~

BusConnections.. ........................................................................ 3-8

Primary Address Programming ............................................................ 3-10

SOFTWARE CONSIDERATIONS I

.............................

............................... 3-10. ...

Controlled Interface Routines .............................................................. 3-10

HP-8 BASIC Statements .................................................................... 3-11

Interface Function Codes . . . 3-L?

Model 775 Interface Commandr

;

............................................................ 3-13

GENER,

AL BUS COMMAND PROGRAMMING .............................................. 3-13

REN (Remote Enable) ..................................................................... 3-13

IFC (Interface Clear) ..,,,...,,,,.......................................................... 3-14

LLO‘(Local Lockoui) .............................. .: ...................................... 3-14

GTL (Go To Local) ........................................................................ 3-14

DCL(Device Clear) ....................................................................... 3-15

SDC (Selective Device Clear) .............................................................. ,3-15

GET (Group Execute Trigger) .............................................................. 3-15

Serial Polling (SPE,

SPD)

.................................................................. 3-16

DEVICE-DEPENDENT COMMAND PROGRAMMING ........................................ 3-16

Execute (X). .............................................................................. 3-19

Function(F) .............................................................................. 3-19

Channels A, d Coupling (AC, BC) ......................................................... 3-19’ ’

Channels A, B Attenuator (AA, BA) ....................................................... 3-20

Channels A, B Filter (AF, BF) ............................................................. 3-20

Channels A, B Slope (AS, BS). ............................................................ 3-20

Channels A, B Trigger Level (AL,

BL)

...................................................... 3-20

Rate(S) ................................................................................. 3-21

Gate Time(G) ........................................................................... 3-22

Delay Time(W) .......................................................................... 3-22

Delay(I) .................................................................................

Displayed Digits(N) 3-23 I

...................................................................... 3-23

Triggering (T) ............................................................................ 3-23

EOI(K) ................................................................................. 3-23

SRQ Mode (M) and Serial Poll Status Byte Format .......................................... 3-24

Displayed Modes (D) ..................................................................... 3-26

Self-Test

(J) ...............................................................................

3-27

READING FROM THE MODEL 775 ......................................................... 3-27

Data Control Commands (B) .............................................................. 3-28

Status Word

(U)

.......................................................................... 3-29

Terminator (Y) ........................................................................... 3-30

Prefix(P) ................................................................................ 3-31

Dump Mode (53 Rate Mode) .............................................................. 3-31

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TABLEOFCONTENTS

3.12

FRONT PANEL PROGRAhJ.MING ...................................................................... 3-34

3.x2.1 IDDCError ......................................................................................... 3-34

3.12.2 IDDCO Error ....................................................................................... 3-34

SECTION G-PERFORMANCE VERIFICATION

413

‘~ 4.4

4.5

4.5.1

4.52

‘4.5.3

.,- 4.5.4

4.5.5

4.5.6

a 4.5.7

. +,4.5.8

4.5.9

INTRODUCTION ........................................................................... 4-l

ENVIRONMENTAL CONDITIONS ........................................................... 4-l

RECOMMENDED TEST EOUIFMENT ........................................................ 4-l

INITIAL CONDITIONS -

... ...........................................................

VERIFICATION PROCEDURES ......................................................

Channels A, B and C Inputs Sensitivity. .............................................

Period Measurement Accuracy Check ...............................................

Period Averaged Measurement Accuracy Check ......................................

Tie Interval A-B Measurement Operation Check., .................................

Pulse A Measurement Operation Check.. ...........................................

Delay Operation Check ............................................................

External Gate Operation Check .....................................................

Arming Operation Check

............................................................

Model7752TCXO Accuracy Check ..................................................

SECTION 5-THEORY OF OPERATION

5.1

5.2

5.3

5.3.1

5.3.2

5.3.3

5.3.4

5.3.5

5.3.6

5.3.7

* 5.4

5.4.1

5.4.2

5.4.3

54.4

5.4.5

INTRODUCTION ........................................................................... 5-l

OVERALL FUNCTIONAL DESCRIPTION ...................................................... 5-l

ANALOG CIRCIJITP.Y. ....................................................................... 5-3

Input Circuits A and B .................................................................... 5-3

Input C~cuitC

............................................................................ 5-3

1OMHz Standard Reference Oscillator ....................................................... 5-3

1OMHz ICXO Reference Oscillator .......................................................... 5-3

100MHzMultiplier ........................................................................ 5-3

Measurement Section ...................................................................... 5-4

Power Supply ............................................................................. 5-4

DIGITAL CIRCUITRY ....................................................................... 5-D

Microcomputer Block Diagram ............................................................. 5-13

Memory Mapping ........................................................................ 5-13

Address Decoding ........................................................................ 5-13

Keyboard/Display Interface ................................................................ 5-14

IEEE Interface ............................................................................ 5-14

SECTION 6-MAINTENANCE

INTRODUCTION .................................................................. 6-l

LINE VOLIAGE SELECTION ........................................................ 6-l

FUSE REPLACEMENT ....................................................................... 6-l

USING AN EXTERNAL TIME BASE,,

........................................................

6-2

MODEL 7751 CHANNEL C OPTION INSTALLATION ......................................... 6-3

MODEL 7752 TCXO OPTION INSTALLATION ................................................ 6-4

CALIBRATION ............................................................................. 6-5

Environmental Conditions. ................................................................. 6-5

Warm-Up Period .......................................................................... 6-5

Recommended Test Equipment ............................................................. 6-5

Calibration Procedure ...................................................................... 6-5

Multiplier Adjustment ..................................................................... 6-7

6.1

6.2

243

6.5

6.6

6.7

6.7.1

6.7.2

6.7.3

6.7.4

6.7.5

iii

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TABLEOF CONTENTS

6.7.6

6.7.7

6.7.8

6.7.9

6.7.10

6.8

6.9

6.10

6.10.1

6.10.2

6.10.3

6.10.4

6.10.5

6.10.6

6.10.7

6.10.8

6.10.9

Trigger Level Adjustment

................................................................... 6-7

Channels A and B Sensitivity Adjustment ................................................... 6-7

Inputs A and B Attenuator Compensation ................................................... 6-7

Tune Base Adjustment (Standard 5 PPM Tune Base) .......................................... 6-7

Time Base Adjustment (Optional 1 PPM Tie Base) .......................................... 6-7

SPECIAL HANDLING OF SEATIC SENSITIVE DEVICES ....................................... 6-8

DISASSEMBLY INSTRUCI’IONS. ............................................................. 6-8

TROUBLESHOOnNG ...................................................................... 6-10

Recommended Test Equipment. ............................................................ 6-10

Power-Up Self Diagnostics ................................................................. 6-10

Power Supply Checks

..................................................................... 6-10

Reference Oscillator and Clock Checks ...................................................... 6-11

Digital Circuitry and Display Checks ....................................................... 6-11

Signal Conditioning and Input Circuit Checks. .............................................. 6-11

Multiplier Circuit Checks .................................................................. 6-11

Trigger Level Checks ...................................................................... 6-11

Measurement Section Checks.. ............................................................ 6-11

SECTION 7-REPLACEABLE PARTS

Zl INTRODUCTION ............................................................................ 7-1

7.2 PARTSLIST.. ............................................................................... 7-l

7.3 ORDERING INFORMATION ................................................................. 7-l

7.4 FACTORY SERVICE .......................................................................... 7-1

7.5 SCHEMATIC DIAGRAM AND COMPONENT LOCATION DRAWINGS .......................... 7-l

A APPENDIX.. ............................................................................... A-l

I INDEX ...................................................................................... I-l

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LIST OF ILLUSTRATIONS

2-l

2-2

2-3

2-4

2-5

3-l

3-2

3-3

3-4

3-5

3-6

3-7

3-8

3-9

3-10

5-l

5-2

5-3

5-4

5-5

5-6

5-7

5-8

6-l

6-2

6-3

6-4

6-5

7-l

7-2

7-3

7-4

7-5

7-b

7-7

7-8

7-9

7-10

Model775

Front Panel

....................................................................... 2-2

Model775RearPanel ........................................................................ 2-3

FallTime Measurement ..................................................................... 2-14

Using Delay to Measure Contact Dwell Time .................................................. Z-15

High Frequency Multiplexed Measurements ................................................... 2-15

IEEE Bus Configuration ................................... 3-2

IEEE Handshake Sequence ................................ 3-3

Command Codes ........................................ 3-7

System Types ............................................ 3-8

IEEE-468 Connector ...................................... 3-8

IEEE-488 Connections., ...................................

..,...

3-9

Rear Panel of Model 775 Showing IEEE connector ...........

.,..,.

3-9

Contact Assignments ..................................... 3-9

Typical IEEE-488 Bus Driver (One of 16) ................... 3-10

IEEE-488 Display Error Messages ..........................

.,....

3-35

Model775 Simplified BlockDiagram .......................................................... 5-2

Frequency A Measurement Block Diagram. .................................................... 5-6

Frequency B Measurement Block Diagram ..................................................... 5-7

Frequency C Measurement Block Diagram ..................................................... 5-8

Period A Measurement Block Diagram ........................................................ 5-9

Time Interval A-B Measurement Block Diagram .............................................. 5-10

Pulse Width Measurement Block Diagram. .................................................... 5-11

Microcomputer Block Diagram ............................................................... 5-12

Model 775Standard 5ppm Timebase .......................

Model 7751 Installation ...................................

Model 7752 Installation ...................................

Model 775 Calibration Adjustments ........................

Model 775 Exploded View ................................

Mother Board, Component Location Drawing .......................................

Mother Board, Schematic Diagram .................................................

Display Board, Component Location Drawing ........................................

Display Board, Schematic Diagram ..................................................

Model 7751, Component Location Drawing ..........................................

Model 7751, Schematic Diagram ....................................................

Model 7752, Component Location Drawing ..........................................

Model 7752, Schematic Diagram ....................................................

5 ppm Oscillator, Component Location Drawing. .....................................

5 ppm Oscillator, Schematic Location Diagram .......................................

6-2

b-3

b-4

6-6

6-9

7-11

7-13

7-26

7-27

7-29

7-30

7-31

7-32

7-33

7-34

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