Información del equipo:

Marconi 2023 Generador
Fabricante:
Marconi
Modelo: 2023
Fecha: 1995
Categoría: Los instrumentos de medición
Grupo: Generador
Descripción: AM/FM Signal Generator
Información:
                                    Introduction

The 2023 and 2024 are portable and lightweight synthesized signal 
generators covering the frequency range 10 kHz to 1.2 GHz (2023) and 10 
kHz to 2.4 GHz (2024). A dot matrix display with a comprehensive set of utility 
menus allow flexibility of operation and ease of use. The RF output can be 
amplitude, frequency, phase or pulse modulated. An internal programmable 
AF source is capable of generating simultaneous two-tone modulation.

All parameters can be entered from a front panel keyboard and a rotary 
control can be used to adjust most settings. Microprocessor control ensures 
that the instruments are flexible and easy to use and allows programming by 
either the General Purpose Interface Bus (GPIB) or by RS-232. The GPIB is 
designed to IEEE Standard 488.2. The interfaces allow remote control of all 
functions except the supply switch, and allow the instruments to be used 
either manually or as part of a fully automated test system.

Main features

Operation

Selection of parameters on the screen may involve one or more of the 
numeric, hard or menu selection keys or the rotary control knob. Parameters 
may be set to specific values by numeric key entry, while values may be 
varied in steps of any size using the DOWN/UP keys or altered by moving the 
control knob, set to a particular sensitivity.

Display

The display is a dot matrix liquid crystal panel, with backlighting. Display 
contrast may be varied to accommodate differing lighting conditions and the 
setting saved in memory. A graphical display test is available to the user.

Frequency selection

Carrier frequency is either selected directly via the keyboard or remotely via 
the interfaces. Frequency resolution is 1 Hz across the band* A series of 
carrier frequencies can be stored in non-volatile memory for recall when 
required.

Output

RF output up to +13 dBm can be set by direct keyboard entry with a resolution 
of 0.1 dB over the entire range. For instruments fitted with the high power 
option, RF' output is increased to +25 dBm (+19 dBm above 1.2 GHz). A 
carrier ON/OFF key is provided to completely disable the output.

A choice of level units is available to the user and provision is made for the 
conversion of units (for example, dBm to ¡aV) by a simple keypress.

An electronic trip protects the Generator output against reverse power of up 
to 50 W. This prevents damage to output circuits when RF or DC power is 
accidentally applied to the RF OUTPUT connector.

To facilitate testing of receiver squelch systems, an attenuator hold function 
allows control of the RF output without introducing RF level drop-outs from the 
step attenuator.

Modulation

Comprehensive amplitude, frequency and phase modulations are available. 
Pulse modulation can be applied to the carrier from an external pulse source. 
The instrument also accepts one or two logic level inputs to produce a 2-level 
or 4-level FSK modulated output. An internal modulation Oscillator is provided, 
having a frequency range of 0.01 Hz to 20 kHz. The Oscillator is capable of 
generating one or two modulation tones simultaneously in one modulation 
channel An independent BNC input on the front panel allows external 
modulation signals to be combined

with the internal signal(s). These sources can be combined to give a number 
of modulation modes. The pulse modulation can be used in combination with 
the other forms of modulation.

The frequency modulation range provides a Î dB bandwidth of typically 100 
kHz and provides FM deviation up to a maximum of 100 kHz. AC or DC 
coupled FM can be selected. Phase modulation is also available with a 10 kHz 
bandwidth up to a maximum of 10 radians.

Amplitude modulation with a 1 dB bandwidth of typically 30 kHz and with 
modulation depths of up to 99.9% is available with a resolution of 0.1%. Pulse 
modulation is available as standard with typical rise and fall times of less than 
10 |is and 40 dB on/off ratio.

The external input voltage required for 100% modulation is I V RMS (1.414 V 
peak). To accommodate other signal levels, Automatic Level Control (ALC) 
can be selected which provides correctly calibrated modulation for inputs 
between 0.75 and 1.25 V RMS.

A MOD ON/OFF key simplifies the testing of signal to noise ratio.

Incrementing

All major parameters can be incremented or decremented in step sizes 
entered via keyboard entry or remotely. If no step size is entered for a 
parameter, the steps are preset to I kHz for carrier frequency, 1 kHz for 
modulation oscillator, 1 kHz for FM deviation, 0.1% for AM depth, 0.01 rad for 
$M and 1 dB for output level.

In addition, the rotary control knob can be used to vary the parameter with 
the sensitivity of the knob being changed by means of the xlO and -*-10 keys.

Frequency sweep

The sweep capability of the instrument allows comprehensive testing of 
systems. Four parameters are used to specify sweep; start, stop, step size 
and time per step, all of which may be specified by the user. The sweep can 
be paused at any time. During the sweep the RF level can be altered using the 
rotary control. Sweep triggering can be single shot or continuous and can be 
initiated directly or on the detection of a trigger. The triggering signal may 
either be programmed or from a TTL signal applied to the rear panel 
TRIGGER input.

Memory

The instrument provides both non-volatile and volatile memory for storing 
instrument settings. The non-volatile memory provides 100 instrument 
settings and 100 settings of carrier frequency only. The volatile memory 
(RAM) also provides 100 instrument settings. Any one of the nonvolatile 
instrument settings can be selected as the power-up setting for the 
instrument.

Memory cloning

The stored settings in one instrument can be easily transferred (without the 
use of a controller) to another instrument using the RS-232 interface, or to 
several other instruments using the GPIB Interface.

Memory sequencing

A Software facility allows sequences of stored instrument settings to be 
defined. The incrementing facilities can then be used to cycle through the 
settings in manually operated test systems.

Programming

A GPIB Interface is fitted so that all functions are controllable via the Interface 
bus which is designed to the IEEE Standard 488.2. The instrument can 
function both as talker and listener. The instrument also has an RS-232 
Interface which uses the common GPIB command set. The interfaces enable 
the instrument to be remotely controlled as well as being used to transfer 
settings (cloning) from one instrument to another.
Software protection

To prevent accidental interference with the contents of internal memories, 
internal data is protected.
Calibration data

All alignment data is digitally derived. Realignment can be undertaken, 
without removing covers, by protected front panel functions or via the GPIB 
interface.
Spectral purity

With an SSB phase noise performance of typically -121 dBc/Hz at 20 kHz 
offset from a 1 GHz carrier, these instruments can be used for both in-
channel and adjacent channel receiver measurements. Harmonically related 
signals and non-harmonics are typically better than -25 dBc and -60 dBc 
respectively.

Calibration

This instrument has a recommended two year calibration interval after which 
it should be returned for recalibration (for addresses refer to 'Addresses' 
section at end of manual).

Estos manuales están disponibles para el equipo anterior:

Tipo de manual: Manual del usuario Marconi-11672-Manual-Page-1-Picture
Páginas: 204
Tamaño: 7.56 Mbytes (7930887 Bytes)
Idioma Inglés
Revisión: 2
Manual-/ número de identificación: 46882-225U
Fecha: 01 mayo 1995
Calidad: Documento Scaned, todo legible.
Fecha de carga:
MD5: b54fb622e7fd2dd0e28a66fb2a3079d3
Descargas: 151 desde 06 enero 2019
Información:
This manual explains how to use the 2023 and 2024 AM/FM Signal 
Generators. Persons engaged on work relating to equipment who have a 
need for accurately generated signals in the VHF and UHF spectrum.


Chapter 1

Main features and performance data.

Chapter 2

Installation details.

Chapter 3

Operation for the experienced user.

Chapter 4

Detailed operation including first time usage. Chapter 5

GPIB operation with keywords and sample programs. Chapter 6

Brief technical description.

Chapter 7

Instructions for doing acceptance testing.
Marconi-11672-Manual-Page-1-Picture


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