Introduction; General Description; Instrument Identification; Specifications - HP 4935A Operating And Service Manual

Model 4935A . t
l-l.

INTRODUCTION

1-2. This Operating and Service manual contains information to install, operate, maintain, and service
the HI' Model 49:{5A Transmission Impairment Measuring Set (TIMS). Figure 1-l shows the HP Model
following information:
SECTION I. GENERAL INFORMATION. Provides identification, specifications, related
manuals, and user-repair information.
SECTION II. INSTALLATION. Contains unpacking and inspection information, power
requirements, packaging, and storage instructions.
SECTION III. OPERATION. Includes an explanation of controls, connectors, indicators, and an
automatic self check procedure. Describes measurement principles and front panel instructions for
making each measurement.
instrument's performance is in accordance with the specifications.
SECTION V. ADJUSTMENTS. Provides adjustment and calibration procedures.
SECTION VI. REPLACEARLE PARTS. Lists and identifies the instrument assemblies and
replaceable parts.
instruments with earlier serial numbers.
SECTION VIII. SERVICE. Includes theory of operation, troubleshooting procedures, flowcharts,
component locators, and schematic diagrams.
1-3.
GENERAL
HI' Model 49XA is a Transmission Impairment Measuring Set (TIMS) which measures wideband
data and voice impairments. The frequency range over which measurements are made is 20 Hz to 110 kHz,
in steps of I, 10, 100, 1000, or 10,000 Hz. There are four permanently stored, fixed frequencies -404, 1004,
2804. and 271:s Hz. Any other four frequencies may be temporarily assigned and stored by the user.
1-5. INSTRUMENT
l-6. A IO character serial number (OOOOAOOOOO) is inscribed on the rear panel. The first four digits and
the letter are the serial prefix. The serial prefix will change only if changes are made to the instrument; a
Manual Change Sheet will be included with the manuals of any instruments affected. Thelast five numbers
form the serial suffix which is unique to each instrument.
1-7.

SPECIFICATIONS

Instrument specifications are listed in Table
SECTION I

GENERAL INFORMATION

IV. PERFORMANCE TESTS. C' xtves test procedures required to verify that the
DESCRIPTION
IDENTIFICATION
t
-1.
I
General Information
l-l