Tektronix 791AD User manual

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7912AD
CALIBRATION KIT
067-0854-00
TEKTRCNI~

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Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
First Printing MAY 1978
COMMITTEDTO EXCELLENCE
7912AD
CALIBRATION KIT
067-0854-00
INSTRUCTION MANUAL
Serial Number
070-2490-00

WARRANTY
All TEl(TRONIX instrtJments are warranted against
defective materials
'cc;•··.,~orkmanship for one
Any questions with f'i'R~!ct to the warranty snc>u1ci.
betaken up with y~yrJiEl(TRONIX Field Engineer
representative.
vy~~"
All requests·~~fottr ·~i~~~~ ... and replacement parts
should be direC'tes o the TEKTRONIX Field Office
or representative ip.your area. This will assure you
the fastest ~si~le •;'~~flice: Plea~f~'rich.ide th~~·
instrument e Nomb~.tlbr Part Nuriltferand Serictl;1
Number wit · U.;~eqo~llt{flor parts dP~ervice.
• ···~
0
$~"C.2g~
1
~~~~~':.:~J·;~'i7~;z.itj~~VTektronix, Inc., Beaverton,
, .• ·oreganf'Printed in. the United States of America. All
rights reserved. Contents of this publication may not
be reproduced in any form without permission of
Tektronix, Inc.
U.S.A. and foreign Tektronix products covered by
U.S. and foreign patents and/or patents pending.
TEKTRONIX is a registered trademark of Tektronix,
Inc.

7912AD CALIBRATION KIT
TABLE OF CONTENTS
SAFETY SUMMARY
SECTION 1 - OPERATION
Calibration Aid
Controls and Connectors
Specifications
Cables and Connectors
Extender Boards
SECTION 2 - SERVICING
Circuit Description
Cathode Blanking
Preamp
Resolution Check
Maintenance
Preventative
Troubleshooting
Corrective Maintenance
Calibration
Introduction
Calibration Procedure
SECTION 3 - ELECTRICAL PARTS LIST
SECTION 4 - DIAGRAMS
SECTION 5 - MECHANICAL PARTS LIST
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1-1
1-1
1-2
1-5
1-6
2-1
2-1
2-2
2-3
2-3
2-4
2-4
2-5
2-5
2-5
2-7

7912AD CALIBRATION KIT
SAFETY SUMMARY
This manual contains safety information which the user must follow to
ensure safe operation of this instrument. WARNING information is intended
to protect the operator. The following are general safety precautions
that must be observed during all phases of operation and maintenance.
WARNING
The following servicing instructions are for use
by qualified personnel only. To avoid personal
injury, do not perform any servicing other than
that contained in operating instructions unless
you are qualified to do so.
Ground the Instrument
To reduce electrical-shock hazard, the 7912AD chassis must be properly
grounded. Refer to the 7912AD Service Manual for grounding information.
Do Not Operate in Explosive Atmosphere
Do not operate this instrument in an area where flammable gases or fumes
are present. Such operation could cause an explosion.
Do Not Service or Adjust Alone
Do not service or make internal adjustments to this instrument unless
another person, capable of giving first aid and resuscitation, is
present.
Disconnect Power Before Servicing
To avoid electrical shock, disconnect the instrument from the power
source before soldering.
To avoid electrical shock, disconnect the instrument from the power
source before replacing components.
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7912AD CALIBRATION KIT
2384-01
The 7912AD Ca1ibration Kit
iii

7912AD CALIBRATION KIT
SECTION 1
OPERATION
The TEKTRONIX 7912AD Calibration Kit provides signals and makes
signal connections for calibration and repair of the TEKTRONIX 7912AD
Programmable Digitizer. For these purposes, the kit contains a
calibration signal source, cables, and extender cards. The calibration
signal source is the same one supplied with the R7912 Calibration Kit;
however, new cables and extenders have been substituted as necessary.
Calibration Aid
The Calibration Aid is a calibration signal source that is used
during several steps in the 7912AD calibration procedure. Also called the
Video Calibrator, it provides special-purpose signals used to adjust the
7912AD video preamplifier and processor and to check the horizontal
resolution of data acquired by the 7912AD. Specific operating
instruct~ons for the Calibration Aid are not given in this manual because
these instructions are part of the 7912AD calibration procedure. More
general operating information is given here, however, to describe the
controls and connectors and to specify performance of the Calibration
Aid.
Controls and Connectors
Power Connector: Mates with the 7912AD PROBE POWER outlet to power
the Calibration Aid.
VIDEO CALIBRATION Connector: Provides either the CATHODE BLANKING or
PREAMP signal (selected by switch).
CATHODE BLANKING: A negative-going pulse used to blank a small area
in the center of the 7912AD scan converter target.
PREAMP: A standard-amplitude signal to check the gain of the 7912AD
video preamplifier.
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7912AD CALIBRATION KIT
RESOLUTION CHECK Connector: Provides a fast-rise signal as selected
by the VERTICAL DELAY switch. This signal is used to check the 7912AD
data resolution. When the VERTICAL DELAY switch is set to the IN
position, the signal is delayed by about 1.25 nanoseconds from the
triggering signal.
TRIG OUT Connector: Provides a triggering signal for the other
outputs. The CATHODE BLANKING/PREAMP switch must be set to PREAMP to get
either the PREAMP or RESOLUTION CHECK triggering signal.
CAL Connector: Provides input for a clock signal from the 7912AD.
SYNC IN Probe: Provides input for a sync signal from the 7912AD.
Specifications
The electrical specifications listed in Table 1-1 are valid within
the environmental limits in Table 1-2. Also, the Calibration Aid must be
calibrated within each 1000 hours of operation or each six-month period
if operated infrequently; it should be calibrated at an ambient
temperature of +20 to +30 degrees C after a five-minute warm-up.
Statements in the Performance Requirements column are verified by
performing the calibration procedure. Statements in the Supplemental
Information column are not to be construed as performance requirements,
but indicate expected performance.
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