Apparecchiature informatiche

Marconi 2955A Communications Test Set
Modello: 2955A
Data: 1989
Categoria: Strumenti di misura
Gruppo: Communications Test Set

Radio Communications Test Set 2955A provides comprehensive test facilities for AM, FM and ΦΜ mobile radio transceivers operating up to 1000 MHz. The 2955A is a combination of the following instruments:- RF power meter. DC and AF voltmeter. RF Counter. AF Counter. RF Generator. AF generators (two). Modulation meter. AF distortion meter. S/N and SINAD meter. Sequential tones decoder and encoder. DTMF decoder and encoder. DCS decoder and encoder. POCSAG radio pager encoder. Digital Oscilloscope. These are automatically connected to the appropriate socket w'hen an operating mode is selected. A large CRT display shows all the generated and measured information for each test and a direct indication of the control settings being used. The 2955A can be used to check a wide range of equipment including simplex and duplex radio telephones and mobiles using selective calling and cross-band repeaters. Push-button selection makes all the necessary interconnections for each measurement, eliminating the need for the many interconnections required when separate instruments are used. Function selection and data entries are made on a colour-coded keyboard with the operating sequence logically arranged from left to right. Instrument operation is greatly facilitated by means of CRT displays which provide prompts during data entry and guidance during operating sequences while also showing the instrument settings and the measurement results. The measurement results are displayed by digital readouts and also by either autoranging bar charts or by a storage Oscilloscope which has repetitive sweep, single shot and freeze facilities. Radio Communications Test Set type 2955R is identical to the 2955A except that the 2955R also contains a sensitive receiver for off-air monitor testing of transmitters. Frequency meters. As there are two frequency counters, simultaneous AF and RF frequency readings can be displayed. Ranges and resolutions are respectively from 20 Hz to 20 kHz at 0.1 or 1 Hz and from 1.5 to 1000 MHz at 1 or 10 Hz. Either an internal or an external Frequency Standard can be used. Signal Generator. The signal Generator can be amplitude, frequency, or phase modulated, internally or externally, the internal modulating signal being obtained from the AF generators. Amplitude modulation is variable up to 99% for carrier frequencies from 0.4 to 500 MHz. FM deviation can be set from 0 to 25 kHz and <£M deviation from 0 to 10 radians. Transmitter and receiver RF signals use N and BNC connectors which are selected by means of a key. Reverse power overload is indicated by a visual warning and an audible alarm. When a reverse power overload is applied to the BNC socket, an automatic trip circuit operates. Modulation meter. Automatic frequency tuning and levelling of the modulation monitor provide accurate measurements of AM, FM and <i>M. Because of the independent tuning, modulation measurements can be made on duplex systems. The modulation can be observed on an Oscilloscope and its symmetry checked from the peak and trough values displayed on a dual bar chart. The demodulated output is available at a rear panel socket. Provision is made for audible monitoring using the built-in loudspeaker or by an external loudspeaker or headphones. RF power meter. The absorption RF power meter measures up to 75 W continuously or up to 150 W for short periods over a frequency range of 1.5 to. 1000 MHz. The connection of the RF Directional Power Head (available as an optional" accessory) extends the capability of the instrument by enabling measurements of ¡forward power, reverse power and VSWR to be made. AF generators. The two AF generators provide a range of frequencies from 20 Hz to 20 kHz for single-tone or two-tone testing. The audio output is available at a front panel socket and the generators also provide the internal AM, FM and <I>M for the RF signal Generator. A combined 600 £2 Balanced to Unbalanced Convertor and 20 dB Attenuator is available as an optional accessory. AF voltmeter. Operating in the range 20 Hz to 20 kHz, the true RMS voltmeter has provisions for measuring AF or AF plus the DC component. Band-pass and low-pass filters can be selected. : Distortion, S/N (signal to noise) or SINAD (signal to noise and distortion) meter. The AF distortion and noise meter operates at 1 kHz which is supplied by one of the AF generators. The bar chart displays are autoranged at 10% and 30% (for distortion), at 30 and 100 dB (for S/N) or at 18 and 50 dB (for SINAD). The Psophometric Filter Units (available as optional accessories) enable CCITT and C-message weighted measurements to be made. Sequential tones decoder and encoder. For testing selective calling tones encoding and decoding equipment, the instrument is capable of receiving and generating five defined tone frequency standards plus a user-defined standard. Provision is made to receive and to send sequences of up to 33 tone frequencies. For transmitter testihg, each received tone is compared with the standard frequency allocations which is held in memory and, if it is within the limits, its tone number and % frequency error are displayed. For receiver testing, the tones can be generated in single step, tone burst or continuous cycle. There is a revertive tones facility whereby tones are sent to a receiver and the the answering sequence is decoded. DTMF decoder and encoder. There are similar facilities for testing DTMF encoding and decoding equipment. DCS decoder and encoder. There are similar facilities for DCS encoding and decoding equipment. POCSAG radio pager encoder. The instrument can be used to check the response of a pager to an RF signal modulated with the pager’s address and an appropriate message. Deliberate errors can be created in the outgoing signal. GPIB Interface unit. This unit allows the instrument to form part of an automatic test system. The GPIB additionally enables a display to be configured to the user’s own requirements using a comprehensive character set. The GPIB also enables the 24 Column Printer (available as an optional accessory) to be used.

Questi manuali sono disponibili per l'attrezzatura di cui sopra:

Tipo manuale: Manuale d'uso Marconi-7808-Manual-Page-1-Picture
Pagine: 52
Dimensioni: 1.67 Mbytes (1749128 Bytes)
Lingua: Inglese
Manuale-ID/numero: 46881-986A
Data: luglio 1989
Qualità: Documento scansionato, tutto leggibile.
Data di aggiunta:
MD5: 080b38203db36201dbf4b4e70454e683
Downloads: 288 dal 28 maggio 2016

Introductory Guide About this guide 3 Introduction 4 Preliminary actions 6 Tests on a transmitter 7 Tests on a receiver 15 Duplex tests 29 Audio tests 37 Signalling codes tests 43 Oscilloscope 49 Summary of indicators, controls and connectors 51


Tipo manuale: Manuale di servizio Marconi-7810-Manual-Page-1-Picture
Pagine: 433
Dimensioni: 15.32 Mbytes (16060200 Bytes)
Lingua: Inglese
Revisione: Issue 4
Manuale-ID/numero: 46881-954A
Data: gennaio 1991
Qualità: Documento scansionato, la lettura in parte male, non in parte leggibile.
Data di aggiunta:
MD5: deb0f3ab8da2d88739e59a7e066d84a2
Downloads: 811 dal 29 maggio 2016

The following amendments are incorporated in this manual : 1 Apr. 90 2 Sep. 90 3 Jan. 91 Preface Servicing precautions Chapter 4-2 TECHNICAL DESCRIPTION Chapter 5-0 MAINTENANCE Chapter 5-1 PERFORMANCE TESTING Chapter 5-2 ADJUSTMENT AND CALIBRATION Chapter 5-3 FAULT DIAGNOSIS Chapter 6 REPLACEABLE PARTS Chapter 7 SERVICING DIAGRAMS


Tipo manuale: Manuale d'uso Marconi-11668-Manual-Page-1-Picture
Pagine: 174
Dimensioni: 4.72 Mbytes (4950405 Bytes)
Lingua: Inglese
Revisione: 5
Manuale-ID/numero: 46881-952B
Data: 01 gennaio 1989
Qualità: Documento scansionato, la lettura in parte male, non in parte leggibile.
Data di aggiunta:
MD5: a29951d1a08a7650e397f5fd027be877
Downloads: 135 dal 05 gennaio 2019

Preface v,* Operating precautions vi Compatibility with 2955 viii Chapter 1 GENERAL INFORMATION 1-1 Introduction 1-1 Special features 1-4 Performance data 1-5 Accessories 1-20 Chapter 2 INSTALLATION 2-1 Unpacking and repacking 2-1 Mounting arrangements 2-2 Rack mounting 2-2 Fitting the battery option 2-2 Safety testing 2-3 Power requirements 2-3 Acceptance testing 2-4 General purpose Interface bus 2-5 Accessory socket 2-6 RF in/out socket 2-7 Chapter 3-1 INTRODUCTION TO OPERATION 3-1-1 General 3-1-1 Initial settings 3-1-1 Self testing 3-1-1 Selecting the measurement mode 3-1-2 Front panel 3-1-2 Rear panel 3-1-4 Accessories 3-1-5 Chapter 3-2 TRANSMITTER TESTING 3-2-1 AF generators 3-2-2 RF power meter 3-2-6 Modulation meter 3-2-8 Distortion and noise meter 3-2-10 Applications 3-2-12 Chapter 3-3 RECEIVER TESTING 3-3-1 RF generator 3-3-2 AF voltmeter 3-3-9 Distortion and noise meter 3-3-11 Chapter 3-4 DUPLEX TESTING 3-4-1 Controls and connectors 3-4-2 Operation 3-4-3 Tones menu 3-4-4 Modulation and AF setup 3-4-5 Chapter 3-5 AUDIO TESTING 3-5-1 AF generators 3-5-2 AF voltmeter 3-5-7 Distortion meter 3-5-9 Chapter 3-6 SIGNALLING CODES TESTING 3-6-1 Controls and connectors 3-6-2 Sequential tones operation 3-6-4 Revertive sequential tones operation 3-6-13 DTMF (dual-tone multi-frequency) operation 3-6-15 DCS (digitally-coded squelch) operation 3-6-18 POCSAG radio pager testing 3-6-21 Chapter 3-7 HELP KEY OPERATION 3-7-1 Help key 3-7-2 Operating summaries 3-7-2 Parameters 3-7-4 Self testing 3-7-6 Chapter 3-8 TRANSMITTER MONITORING (2955R only) 3-8-1 Controls and connectors 3-8-1 Operation 3-8-3 Chapter 3-9 Printer OPERATION 3-9-1 Introduction 3-9-1 Power supplies , 3-9-1 GPIB connections 3-9-1 Operation 3-9-1 Chapter 4 GPIB OPERATION 4-1 GPIB functions 4-1 GPIB address 4-1 Display 4-2 GPIB commands 4-2 Chapter 5 BRIEF TECHNICAL DESCRIPTION 5-1 Introduction 5-1 RF signal generator 5-2 AF voltmeter 5-3 AF generators 5-4 RF power meter 5-5 Modulation meter 5-6 Distortion and noise meter 5-8 Sensitive receiver 5-10 Chapter 6 ACCEPTANCE TESTING 6-1 Testing 6-3 Oscilloscope 6-3 Modulation meter 6-7 Voltmeter 6-12 RF frequency meter 6-14 AF frequency meter 6-16 AF generators 6-17 DTMF encoder and decoder 6-22 Distortion and noise meter 6-22 RF power meter 6-23 Sequential tones 6-25 RF generator 6-26 2955R sensitive receiver 6-36 Appendix 1 German RFI Declaration for Class B Self-certification App. 1 Index Ind. 1


Tipo manuale: Manuale d'uso Marconi-11675-Manual-Page-1-Picture
Pagine: 26
Dimensioni: 956.51 Kbytes (979471 Bytes)
Lingua: Inglese
Revisione: 2
Manuale-ID/numero: 46881-953K and/or H 52955-910L
Data: 01 gennaio 1989
Qualità: Documento scansionato, tutto leggibile.
Data di aggiunta:
MD5: 0eab0cf9a9718be04aa62b7d1a84f0ee
Downloads: 55 dal 06 gennaio 2019

Programming Manual Chapter 1 PROGRAMMING Chapter 2 COMMAND CODES Chapter 3 WRITING A PROGRAM


Comments (2)

Robert Senkyrsays...

I’m going to be home in about five hours and I’ll have to try it then

merci pour l'aide que vous apportez aux passionnés et professionnels dans cette profession.

Add Comment

* Required information
Captcha Image
Powered by Commentics