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TM 11-6625-2759-14 & P
TECHNICAL MANUAL
OPERATOR'S, ORGANIZATIONAL, DIRECT
SUPPORT, AND GENERAL SUPPORT
MAINTENANCE MANUAL INCLUDING
REPAIR PARTS AND SPECIAL TOOLS LISTS
SPECTRUM ANALYZER PL-1391/U
(TEKTRONIX MODEL 7L5)
(NSN 6625-01-015-6587)
HEADQUARTERS, DEPARTMENT OF THE ARMY
DECEMBER 1978
WARNING
DANGEROUS VOLTAGES
exist in this equipment. Be extremely careful when working on the power supply circuit or the AC line connections during
line power operation. Serious injury or DEATH may result from contact with these points.
DON'T TAKE CHANCES!
TM 11-6625-2759-14 & P
This manual contains copywrite material reproduced by permission of the Tektronix Company.
TECHNICAL MANUAL HEADQUARTERS
DEPARTMENT OF THE ARMY
NO. 11-6625-2759-14 & P WASHINGTON, DC, 6December 1978
OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT,
AND GENERAL SUPPORT MAINTENANCE MANUAL
INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
SPECTRUM ANALYZER PL-1391/U
(TEKTRONIX MODEL 7L5)
(NSN 6625-01-015-6587)
REPORTING OF ERRORS
You can improve this manual by recommending improvements using DA Form 2028-2 located in the back of the
manual. Simply tear out the self- addressed form, fill it out as shown on the sample, fold it where shown, and drop it in the
mail.
If there are no blank DA Forms 2028-2 in the back of the manual, use the standard DA Form 2028 (Recommended
Changes to Publications and Blank Forms) and forward to the Commander, US Army Communications and Electronics
Materiel Readiness Command, ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ 07703.
In either case a reply will be furnished direct to you.
NOTE
This manual is an authentication of the manufacturer's commercial literature which, through usage, has been found to
cover the data required to operate and maintain this equipment. Since the manual was not prepared in accordance with
military specifications and AR 310-3, the format has not been structured to consider levels of maintenance.
i
PART I TM 11-6625-2759-14 & P
TABLE OF CONTENTS
PAGE
Section 0 INTRODUCTION 0-1
Section 1 General Information
Introduction 1-1
Description 1-1
Specification 1-1
Frequency Characteristics 1-1
Input Characteristics 1-2
Amplitude Characteristics 1-2
Sweep Characteristics 1-3
Output Connectors 1-3
Environmental Characteristics 1-4
Physical Characteristics 1-4
Accessories and Options 1-4
Section 2 Installation
Initial Inspection 2-1
Installation 2-1
Repackaging 2-1
Section 3 Operating Instructions
Introduction 3-1
Functional Block Description 3-1
Front Panel Controls and Connectors 3-3
Calibrating the 7L5 to the Oscilloscope Mainframe 3-7
Operational Checkout 3-8
Preliminary Preparation 3-8
Operational Check of Readout Characters 3-8
Dynamic Range Accuracy 3-10
Reference Level Accuracy 3-11
Input Buffer 3-12
Residual (Incidental) FM 3-12
Residual Response 3-12
Sensitivity Check 3-13
Resolution Bandwidth Accuracy, Amplitude Deviation and Shape Factor 3-13
Using the Analyzer 3-14
Impedance Matching 3-14
Signal Application 3-14
Edge Noise 3-14
Frequency Measurement Technique 3-15
Max Span Operation 3-15
Resolution and Resolution Bandwidth 3-15
Digital Storage 3-15
Applications for Spectrum Analyzers 3-15
TM 11-6625-2759-14 & P
SECTION 0
INTRODUCTION
0-1. SCOPE c. Discrepancy in Shipment Report (DISREP)
This manual describes Spectrum Analyzer PL- (SF 361). Fill out and forward Discrepancy in Shipment
1391/U and provides instructions for operation (Part I) Report (DISREP) (SF 361) as prescribed in AR 55-
and maintenance (Part II). Throughout this manual the 38/NAVSUPINST 4610.33B/AFR 75-18/MCO P4610.19C
PL-1391/U is referred to as the Tekronix Model 7L5. and DLAR 4500.15.
0-2. INDEXES OF PUBLICATIONS 0-4. REPORTING EQUIPMENT IMPROVEMENT
RECOMMENDATIONS (EIR)
a. DA Pam 310-4. Refer to the latest issue of
DA Pam 310-4 to determine whether there are new EIR's will be prepared using SF Form 368,
editions, changes, or additional publications pertaining to Quality Deficiency Report. Instructions for preparing
the equipment. EIR's are provided in TM 38-750, The Army Maintenance
Management System. EIR's should be mailed direct to
b. DA Pam 310-7. Refer to the DA Pam 310-7 Commander, US Army Communications and Electronics
to determine whether there are modification work orders Materiel Readiness Command, ATTN: DRSEL-ME-MQ,
(MWO's) pertaining to the equipment. Fort Monmouth, NJ 07703. A reply will be furnished
direct to you.
0-3. FORMS AND RECORDS
0-5. ADMINISTRATIVE STORAGE
a. Reports of Maintenance and Unsatisfactory
Equipment. Maintenance forms, records, and reports For information concerning storage, refer to section 2.
which are to be used by maintenance personnel at all
maintenance levels are listed in and prescribed by TM 0-6. DESTRUCTION OF ARMY ELECTRONICS
38-750. MATERIEL
b. Report of Packaging and Handling
Deficiencies. Fill out and forward DD Form 6 (Packaging Destruction of Army electronics materiel to prevent
Improvement Report) as prescribed in AR 700- enemy use shall be in accordance with TM 750-244-2.
58/NAVSUPINST 4030.29/AFR 71-13Imco P4030.29A
and DLAR 4145.8.
0-1
TM 11-6625-2759-14 & P
Fig. 1-1. 7L5 Spectrum Analyzer.
1-0
TM 11-6625-2759-14 & P
SECTION 1. SPECIFICATION
Introduction
Frequency Characteristics
To effectively use the 7L5 Spectrum Analyzer,
the operation and capabilities of the instrument must be Range
known This instruction manual covers general operating
information about the instrument. Service information, Input Frequency: 10 Hz through 5 0 MHz.
such as circuit description and calibration are contained
in the Service manual. Dot Frequency: 0 Hz through 4999.75 kHz.
Description Accuracy
-6
20