Tektronix YT-1 User manual

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Instruction Manual
YT-1 / YT-1S
Chart Recorder
070-9947-00
ST905-AD-MMC-010
0910-LP-024-4850
NOTE: This manual is intended for YT-1/YT-1S
Chart Recorders serial numbers B030500 and
higher, or units that have been upgraded to that
level (to identify upgrade, see page 8-5 and note
frame cutout next to print head). For instruments
with serial numbers B030499 and lower that have
not been upgraded, please contact your local
Tektronix Customer Service Representative for
information regarding module exchange service.
First Printing: Oct. 1998

Copyright E Tektronix, Inc. 1998. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and
pending. Information in this publication supercedes that in all
previously published material. Specifications and price change
privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX, TEK, and YT-1 / YT-1S are registered trademarks of
Tektronix, Inc.

WARRANTY
Tektronix warrants that this product will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If any such
product proves defective during this warranty period, Tektronix, at its option,
eitherwillrepairthedefectiveproductwithout chargefor parts andlabor,orwill
provide a replacement in exchange for the defective product.
Inordertoobtainserviceunderthiswarranty,CustomermustnotifyTektronixof
the defect before the expiration of the warranty period and make suitable
arrangements for the performance of service. Customer shall be responsible for
packagingandshippingthedefectiveproducttotheservicecenterdesignatedby
Tektronix,withshippingchargesprepaid.Tektronixshallpayforthereturnofthe
product to Customer if the shipment is to a location within the country in which
theTektronixservicecenteris located. Customershallberesponsible for paying
allshippingcharges,duties,taxes,andanyotherchargesforproductsreturnedto
any other locations.
Thiswarrantyshallnotapplytoanydefect,failure,ordamagecausedbyimproper
use or improper or inadequate maintenance and care. Tektronix shall not be
obligatedtofurnishserviceunderthiswarrantya)torepairdamageresultingfrom
attempts by personnel other than Tektronix representatives to install, repair, or
service the product; b) to repair damage resulting from improper use or
connection to incompatible equipment; or c) to service a product that has been
modifiedorintegratedwithotherproductswhentheeffectofsuchmodificationor
integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO
THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES,
EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS
DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE
PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED
TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE
VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.

YT-1 / YT-1S Chart Recorder v
Table of Contents
General Safety Summary
Operator Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation and Repacking
Unpacking and Initial Inspection ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Source and Power Requirements ix. . . . . . . . . . . . . . . . . . . . . . .
Repacking for Shipment ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Instructions
Instructions for Use 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Replacement 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information and Specifications
Product Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standards, Documents, and References Used 2-1. . . . . . . . . . . . . . . . . . .
Characteristics and Specifications 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Performance Checks
Head Alignment Chart Diagnostic and Chart Quality 3-1. . . . . . . . . . . . .
Accessories and Options
Standard and Optional Accessories 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operations
Introduction 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Individual Write Command Operation 5-3. . . . . . . . . . . . . . . . . . . . . . . . .
Individual Read Command Operation 5-5. . . . . . . . . . . . . . . . . . . . . . . . .
Protocol 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Information 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration
LCD Chart Diagnostic 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Check 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
vi YT-1 / YT-1S Chart Recorder
Maintenance
Required Tools 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part Removal/Replacement 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical 7-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 7-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping Instructions 7-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts
Parts Ordering Information 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Replaceable Parts 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Replaceable Parts 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exploded View Diagram 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

YT-1 / YT-1S Chart Recorder vii
General Safety Summary
CAUTION. Do not operate this product without paper installed, or, if
operating when the paper runs out, shut the power off immediately.
Printing without paper might burn out the printhead.
Operator Safety Summary
Power Sources
This product is intended to operate from a power source supplied by
the parent instrument. Do not attempt to power this module by any
other means.
Grounding the Instrument
This product is grounded through the parent instrument. A protective
ground connection is essential for safe operation.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all accessible
conductive parts (including knobs and controls that appear to be
insulating) can render an electric shock.
Refer to connector changes to qualified service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an explosive
atmosphere unless it has been specifically certified for such
operation.

General Safety Summary
viii YT-1 / YT-1S Chart Recorder
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels.
Do not operate the product without the covers and panels properly
installed.
Service Safety Summary
CAUTION. For qualified service personnel only. Refer also to the
preceding Operator Safety Summary.
Do Not Service Alone
Do not perform internal service adjustment of this product unless
another person capable of rendering first aid and resuscitation is
present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product. To avoid
personal injury, do not touch exposed connections and components
while power is on.
Disconnect power before removing protective panels, soldering, or
replacing components.

YT-1 / YT-1S Chart Recorder ix
Installation and Repacking
Unpacking and Initial Inspection
Before unpacking the YT-1/YT-1S from its shipping container or
carton, inspect for signs of external damage. If the carton is
damaged, notify the carrier. The shipping carton contains the basic
instrument and its standard accessories. Refer to the replaceable parts
list for a complete listing.
If the contents of the shipping container are incomplete, if there is
mechanical damage or defect, or if the instrument does not meet
operational check requirements, contact your local Tektronix Field
Office or representative. If the shipping container is damaged, notify
the carrier as well as Tektronix.
The instrument was inspected both mechanically and electrically
before shipment. It should be free of mechanical damage and meet or
exceed all electrical specifications. Procedures to check operational
performance are in the parent instruction service manual. Procedures
to check electrical and mechanical specifications are in the
Calibration section of this manual.
Power Source and Power Requirements
The YT-1/YT-1S is intended to be operated from the parent
instrument’s power supply. A protective ground connection by way
of proper installation in the parent instrument is essential for safe
operation.
Further information on the YT-1/YT-1S power requirements can be
found in the Operator Safety Summary and in the Operator section.
Repacking for Shipment
If the YT-1/YT-1S is to be shipped to a Tektronix Service Center for
service or repair, attach a tag showing the name and address of the
owner, name of the individual at your firm that can be contacted,
complete serial number, and a description of the service required. If

Installation and Repacking
xYT-1 / YT-1S Chart Recorder
the original packaging is unfit for use or is not available, repackage
the instrument per the instructions near the end of the Maintenance
section in this manual.

Operating Instructions

YT-1 / YT-1S Chart Recorder 1–1
Operating Instructions
Instructions for Use
Making permanent records with the 1500-series is easy with the
Tektronix YT-1/YT-1S Digital Chart Recorder.
CAUTION. Do not operate this product without paper installed, or, if
operating when the paper runs out, shut the power off immediately.
Printing without paper might burn out the printhead.
1. Make sure the desired waveform (or waveforms) is displayed on
the LCD.
2. Slide back the protective cover on the recorder. Push PRINT on
the front panel of the chart recorder.
3. When the chart recorder has finished, tear off the paper
recording, pulling the paper to the left. You may prefer to close
the door prior to tearing off the chart to facilitate a cleaner tear.
Making chart recordings with the YT-1/YT-1S will reduce the
charge of the battery pack (if so equipped) in the parent instrument.
Read the appropriate battery information in the parent instrument
Operator section.
Paper Replacement
1. Turn the knurled knob on the front panel of the chart recorder
counter-clockwise until it loosens. Pull the unit from the parent
instrument. Set the YT-1/YT-1S with the front panel to the right.
2. With your thumbs, push the frame surrounding the motor pulley.
Push until the motor assembly latch locks the motor assembly to
the side frame. This loosens the tension in the paper path,
allowing any remaining paper to be removed.
3. Remove the paper retaining knob. Remove any paper and the
empty paper core.

Operating Instructions
1–2YT-1 / YT-1S Chart Recorder
4. Following the diagram on the top of the recorder, place a fresh
roll of paper in the recorder so the paper unwinds off the right
side of the roll into the paper path (looking down on the recorder,
the paper unrolls clockwise). Tearing the end of the paper roll on
a slant will facilitate placing the paper in the slot.
5. Assure that the paper drops down into the paper path without
binding, and the paper protrudes through the slot in the front of
the instrument. Release the keeper from the frame, and the paper
drive mechanism will return to the operating position.

General Information and
Specifications

YT-1 / YT-1S Chart Recorder 2–1
General Information and Specifications
Product Description
The Tektronix YT-1/YT-1S Chart Recorder is an optional accessory
for a parent instrument (e.g., the 1500B/C-series Metallic Time
Domain Reflectometers). It is designed to plug into the instrument in
the option port.
The YT-1/YT-1S has a water resistant door that covers the record
paper slot.
A chart recording is a permanent record. It can be of great service in
fault interpretation (e.g., a chart recording of a fault can be compared
to that of an acceptable test).
Standards, Documents, and References Used
Terminology used in this manual is in accordance with industry
practice. Abbreviations are in accordance with ANSI Y1.1-1972,
with exceptions and additions explained in parentheses in the test.
Graphic symbology is based on ANSI Y32.2-1975. Logic symbology
is based on ANSI Y32.14-1973 and manufacturer’s data books or
sheets. A copy of ANSI standards may be obtained from the Institute
of Electrical and Electronic Engineers, 345 47th Street, New York,
NY 10017.
Characteristics and Specifications
The tables on the following pages list the electrical characteristics
and features that apply to the Tektronix YT-1/YT-1S Chart Recorder
when it is installed in a Tektronix 1500B/C-series TDR instrument
and after a 20 minute warm-up.
The Performance Requirement column describes the limits of the
characteristic and Supplemental Information column describes
features and typical values or information that might be helpful.

General Information and Specifications
2–2YT-1 / YT-1S Chart Recorder
Printing Specifications
Characteristic Performance Required Supplemental Infor.
Writing method Direct thermal
Chart paper Roll type, 50 mm. Outside
dia. 50 mm max. Accept
15 mm spindle. Thermal
coating facing inside roll.
Will allow recorder to meet
print density spec.
Example: See Tektronix
part number in Accessories
section.
End-of-roll warn-
ing
Shall be marked by a red
line beginning 5 ft. from the
end of the roll.
Print color Black
Print density Solid black print pattern
shall measure at 1.1D on
Kodak Gray Scale.
Pattern created by printing
40 element blocks three
times each until a 360 bit
wide by at least 200 bit long
(45 mm by 25 mm min.)
image is formed. Density
measurement made with an
appropriate Densitometer.
Patten print at 25°C ±5°C.
Background den-
sity
Less than 0.2 D when
stored at 70°C for 24 hours.
Print drop-outs No more than 1% of the
elements to be printed shall
fail to print. Adjacent fail-
ures shall number three or
less.
Print element
width
0.12 5mm
Addressable print
elements
384 (48 8-bit bytes)
Print field width 48 mm
Alignment of print
field
Entire print field must lie on
paper.

General Information and Specifications
YT-1 / YT-1S Chart Recorder 2–3
Printing Specifications (Cont.)
Characteristic Supplemental Infor.Performance Required
Orthogonality of
print field
A line printed across the
paper shall be perpendicu-
lar to the edge of the paper
within 1.0 degrees.
Paper movement
per ADVANCE
command
0.125 mm, ±0.01 mm
Record length 10.87 to 12.76 inches Algo-
rithm dependent
Print time Typical 20 seconds Algo-
rithm dependent.
Power Specifications
Characteristic Performance Required Supplemental Infor.
+5 Volts +5 V ±5%, 500 mW max Power is applied to recorder
only while it is operating.
+16 Volts +16 Volts ±10%. Average
Power = 12 W max. Peak
current not to exceed 1.7 A.
Mechanical Characteristics
YT-1/YT-1S plugs into the parent instrument Option Port.