Section IV. PERFORMANCE TESTS

TM 11-6625-2781-14&P-2

Section IV

SECTION IV

PERFORMANCE TESTS

Paragraph

Test Description

4-1. INTRODUCTION

4-23

Input Impedance

4-24

Scan Width Accuracy

4-2. This section contains performance tests for the

4-25

Tuning Dial Accuracy

8553B Spectrum Analyzer RF Section. A display

4-26

Frequency Response

section and IF section are required for performance

4-27

Average Noise Level

tests. Tests for performance of the display section and

4-28

Spurious Responses

IF section are contained in separate manuals and should

4-29

Residual Responses

be performed prior to checking the RF section. Perform

4-30

Noise Sidebands

tests in this section in procedural order with the test

4-31

Local Oscillator Stability and

equipment called for, or with its equivalent.

Residual Frequency Modulation

4-3. Specifications of test equipment and accessories

4-10. Each test is arranged so that the specification is

required to performance-test the RF section are given in

written as it appears in the Table of Specifications in

Table 4-1; a complete list of accessories and test

Section I. Next, a description of the test and any special

equipment, including those required for alignment,

instructions or problem areas is included. Each test that

adjustment, and service, are given in Tables 1-3 and 1-

requires test equipment has a test setup drawing and a

list of required equipment. Step 1 of each procedure

gives control settings required for that particular test.

4-4. Front panel checks for routine inspection are given

in Table 4-2.

Procedures for verifying that the

4-11. Required specifications for test equipment are

instrument meets specifications are given in Paragraphs

detailed in Table 4-1. If substitute test equipment is to

4-23 through 4-31, and a test card in able 4-3 contains

be used, it must meet the specifications listed in order to

data spaces for recording test results.

performance-test the analyzer.

4-5. FRONT PANEL CHECKS

4-12. FRONT PANEL CHECK PROCEDURE

4-6. Before proceeding to the performance tests, the

4-13. Preset Adjustments

instrument must be adjusted and all controls set as

specified in the preset adjustment instructions in

Paragraph 4-13. After the instrument is set up, proceed

4-14. Apply power to the analyzer and while the

with the checks. The instrument should perform as

instrument is warming up, make the following control

called out in the procedure before going on to the

settings:

performance tests (Paragraphs 4-23 through 4-31).

RANGE MHz . ................................ .................. 0-110

FREQUENCY ................................ ................ 40 MHz

4-7. PERFORMANCE TESTS

FINE TUNE ................................ ................... Centered

BANDWIDTH ................................ ................ .300 kHz

SCAN WIDTH ................................ .......... .0-100 MHz

4-8. The performance tests given in this manual are

SCAN WIDTH PER DIVISION ...................... .10 MHz

suitable for incoming inspection, troubleshooting, or

INPUT ATTENUATION ................................ ..... .10 dB

preventive maintenance. During any performance test ,

TUNING STABILIZER ................................ .............On

all shields and connecting hardware must be in place

BASE LINE CLIPPER ................................ ........ . ccw

and the RF section and IF section must be installed in

SCAN TIME PER DIVISION .......... 5 MILLISECONDS

the display section.

LOG REF LEVEL ................................ ......... .-10 dBm

LOG REF LEVEL Vernier ................................ ..... ccw

The tests are designed to verify published instrument

LOG/LINEAR ................................ ...................... LOG

specifications. Perform the tests in the order ,given,

VIDEO FILTER ................................ ................ 10 kHz

and record data on test card (Table 4-3) and/or in the

SCAN MODE . ................................ .................... .INT

data spaces provided in each test.

SCAN TRIGGER . ................................ ........... AUTO

4-9. The tests are arranged in the following order:

4-1