Page 1: Operating Manual
To buy, sell, rent or trade-in this product please click on the link below: http://www.avionteq.com/IFR-Aeroflex-2944B-Communications-Service-Monitor.aspx www.avionteq.com COMMUNICATIONS SERVICE MONITOR 2944B Operating Manual Document part no. 46892/744 Issue 1 20 March 2006...
Page 2 No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, or recorded by any information storage or retrieval system, without permission in writing by Aeroflex International Ltd. (hereafter referred to throughout the document as ‘Aeroflex’). Printed in the UK Document part no.
Page 3: About This Manual
About this manual This manual explains how to use the Communications Service Monitor 2944B. It applies to instruments fitted with main software version 5.xx or later and cellular software version 5.xx. Intended audience People who need to test mobile radio systems and associated equipment.
Page 4: Table Of Contents
Contents PRECAUTIONS ..............................v Chapter 1 GENERAL INFORMATION ...................... 1-1 Chapter 2 INSTALLATION.......................... 2-1 Chapter 3 LOCAL OPERATION ......................... 3-1 Chapter 4 TECHNICAL DESCRIPTION ....................4-1 Chapter 5 ACCEPTANCE TESTING ......................5-1 INDEX ..............................Index-1...
Page 5 Contents Precautions These terms have specific meanings in this manual: information to prevent personal injury. WARNING information to prevent damage to the equipment. important general information. Hazard symbols The meaning of hazard symbols appearing on the equipment and in the documentation is as follows: Symbol Description...
Page 6 WARNING Electrical hazards (AC supply voltage) This equipment conforms with IEC Safety Class I, meaning that it is provided with a protective grounding lead. To maintain this protection the supply lead must always be connected to the source of supply via a socket with a grounded contact. Be aware that the supply filter contains capacitors that may remain charged after the equipment is disconnected from the supply.
Page 7 If the battery has leaked or vented, it must be replaced immediately. Replace only with an identical battery from the same manufacturer or with a type recommended by Aeroflex. Remove the instrument power lead before removing the battery pack.
Page 8 This equipment has been designed and manufactured by Aeroflex to generate low-power RF signals for testing radio communications apparatus. If the equipment is not used in a manner specified by Aeroflex, the protection provided by the equipment may be impaired.
Page 9 Precautions Les termes suivants ont, dans ce manuel, des significations particulières: contient des informations pour éviter toute blessure au personnel. WARNING contient des informations pour éviter les dommages aux équipements. contient d'importantes informations d'ordre général. Symboles signalant un risque La signification des symboles de danger apparaissant sur l'équipement et dans la documentation est la suivante: Symbole Nature du risque...
Page 10 WARNING Sécurité électrique (tension d’alimentation alternative) Cet appareil est protégé conformément à la norme CEI de sécurité Classe 1, c’est-à-dire que sa prise secteur comporte un fil de protection à la terre. Pour maintenir cette protection, le câble d’alimentation doit toujours être branché à la source d’alimentation par l’intermédiaire d’une prise comportant une borne de terre.
Page 11 Si la batterie a eu une fuite ou une ventilation, il faut la remplacer immédiatement. Utilisez seulement une batterie identique du même fabricant ou avec un modèle recommandé par Aeroflex. Débrancher le câble d’alimentation avant de remplacer le pack batterie.
Page 12 Utilisation Cet équipement a été conçu et fabriqué par Aeroflex pour générer des signaux RF de faible puissance pour le test d'appareils de radio communications. La protection de l'équipement peut être altérée s'il n'est pas utilisé dans les conditions spécifiées par Aeroflex.
Page 13 Vorsichtsmassnahmen Diese Hinweise haben eine bestimmte Bedeutung in diesem Handbuch: dienen zur Vermeidung von Verletzungsrisiken. WARNING dienen dem Schutz der Geräte. enthalten wichtige Informationen. Gefahrensymbole Die Bedeutung der Gefahrensymbole auf den Geräten und in der Dokumentation ist wie folgt: Symbol Gefahrenart Beziehen Sie sich auf die Bedienungsanleitung wenn das Messgerät mit diesem Symbol markiert ist.
Page 14 WARNING Elektrische Schläge (Wechselspannungsversorgung) Das Gerät entspricht IEC Sicherheitsklasse 1 mit einem Schutzleiter nach Erde. Das Netzkabel muß stets an eine Steckdose mit Erdkontakt angeschlossen werden. Filterkondensatoren in der internen Spannungsversorgung können auch nach Unterbrechung der Spannungszuführung noch geladen sein. Obwohl die darin gespeicherte Energie innerhalb der Sicherheitsmargen liegt, kann ein leichter Spannungsschlag bei Berührung kurz nach der Unterbrechung erfolgen.
Page 15 Sollte der Akkusatz auslaufen oder eine mechanische Beschädigung aufweisen, so ist er umgehend zu entfernen. Ersetzen Sie diesen nur durch einen identischen Akkusatz des gleichen Herstellers oder mit einem Typ wie er von Aeroflex empfohlen wird. Stecken Sie vor dem Entfernen des Akkusatzes das Netzkabel aus.
Page 16 Dieses Gerät wurde von Aeroflex entwickelt und hergestellt um HF Signale geringer Leistung zum Test von Kommunikationseinrichtungen zu erzeugen. Sollte das Gerät nicht auf die von Aeroflex vorgesehene Art und Weise verwendet werden, kann die Schutzfunktion des Gerätes beeinträchtigt werden.
Page 17 Precauzioni Questi termini vengono utilizzati in questo manuale con significati specifici: riportano informazioni atte ad evitare possibili pericoli alla persona. WARNING riportano informazioni per evitare possibili pericoli all'apparec-chiatura. riportano importanti informazioni di carattere generale. Simboli di pericolo Il significato del simbolo di pericolo riportato sugli strumenti e nella documentazione è il seguente: Simbolo Tipo di pericolo Fare riferimento al manuale operativo quando questo...
Page 18 WARNING Pericoli da elettricità (alimentazione c.a.) Quest ’apparato è provvisto del collegamento di protezione di terra e rispetta le norme di sicurezza IEC, classe 1. Per mantenere questa protezione è necessario che il cavo, la spina e la presa d’alimentazione siano tutti provvisti di terra. Il circuito d’alimentazione contiene dei filtri i cui condensatori possono restare carichi anche dopo aver rimosso l’alimentazione.
Page 19 Se la batteria gocciola o è forata, va sostituita immediatamente. La sostituzione deve essere fatta solo con analoga batteria, dello stesso costruttore, o con un tipo raccomandato dalla Aeroflex. Prima di rimuovere la batteria, occorre scollegare il cavo di alimentazione elettrica esterna dell'apparato.
Page 20 Caratteristiche d’uso Questo strumento è stato progettato e prodotto da Aeroflex generare segnali RF in bassa potenza per provare apparati di radio comunicazione. Se lo strumento non è utilizzato nel modo specificato da Aeroflex, le protezioni previste sullo strumento potrebbero risultare inefficaci.
Page 21 Precauciones Estos términos tienen significados específicos en este manual: contienen información referente a prevención de daños personales. WARNING contienen información referente a prevención de daños en equipos. contienen información general importante. Símbolos de peligro El significado de los símbolos de peligro en el equipo y en la documentación es el siguiente: Símbolo Naturaleza del peligro Vea el manual de funcionamiento cuando este símbolo...
Page 22 WARNING Nivel peligroso de electricidad (tensión de red) Este equipo cumple las normas IEC Seguridad Clase 1, lo que significa que va provisto de un cable de protección de masa. Para mantener esta protección, el cable de alimentación de red debe de conectarse siempre a una clavija con terminal de masa.
Page 23 Si el paquete de baterías ha sufrido pérdidas a fugas de gases, debe reemplazarse inmediatamente. Reemplázela con una batería idéntica del mismo fabricante o con un tipo recomendado por Aeroflex. Desconecte el cable de alimentación del equipo antes de quitar el paquete de baterías. WARNING Superficies a altas temperaturas Tenga cuidado al tocar el conector de entrada RF tipo N tras la aplicación continuada de altos...
Page 24 Idoneidad de uso Este equipo ha sido diseñado y fabricado por Aeroflex para generar señales de RF de bajo nivel para probar equipos de radiocomunicaciones. Si el equipo fuese utilizado de forma diferente a la especificada por Aeroflex, la protección ofrecida por el equipo pudiera quedar reducida.
Page 25 Chapter 1 GENERAL INFORMATION Contents Purpose and features ........................1-2 Transmitter testing ........................1-3 Receiver testing........................1-4 Duplex testing......................... 1-5 Spectrum analyzer........................1-6 AF testing..........................1-6 Performance data......................... 1-7 Receiver measurements ......................1-7 Audio analyzer........................1-9 Transmitter measurements ....................1-11 RF spectrum analyzer ......................
Page 26: Purpose And Features
GENERAL INFORMATION Purpose and features 2944B is a portable Communications Service Monitor for carrying out production, routine and maintenance testing on radio transmitters, receivers and two way radio communication equipment. The Service Monitor contains modules to provide facilities equivalent to the following...
Page 27: Transmitter Testing
GENERAL INFORMATION Transmitter testing Service Monitor MODULATED RF SIGNAL AF GENERATOR OUTPUT Under Test AF (MODULATION) INPUT C6025 Fig. 1-1 Transmitter test setup The transmitter test procedure uses: The AF generators, to provide a source of modulation for the transmitter under test. The RF power meter, to measure the mean output power level of the transmitter.
Page 28: Receiver Testing
GENERAL INFORMATION Receiver testing Service Monitor MODULATED RF TEST SIGNAL Under DEMODULATED AF SIGNAL Test C6026 Fig. 1-2 Receiver test setup The receiver test procedure uses: The RF generator and the AF generators, to produce a transmission with defined parameters. The AF voltmeter, to measure the level of the demodulated signal from the receiver.
Page 29: Duplex Testing
GENERAL INFORMATION Duplex testing Service Monitor MODULATED RF SIGNAL RF TEST FROM RADIO SIGNAL UNDER TEST Rx/Tx DEMODULATED AF SIGNAL Under Test AF GENERATOR OUTPUT C6027 Fig. 1-3 One port duplex test setup Service Monitor MODULATED RF TEST SIGNAL MODULATED RF SIGNAL Rx/Tx Under DEMODULATED AF SIGNAL...
Page 30: Spectrum Analyzer
GENERAL INFORMATION Spectrum analyzer The SPEC ANA mode allows ‘off air’ and directly coupled RF signals to be studied and monitored. Sideband spread, harmonic levels and RF interference can be examined. The frequency range of the spectrum analyzer is from 100 kHz to 1.0 GHz with the start and stop frequencies of the sweep infinitely variable from within this range.
Page 31: Performance Data
GENERAL INFORMATION Performance data Receiver measurements RF signal generator Frequency Range 400 kHz to 1.05 GHz Resolution 10 Hz Indication 10 digit display Setting Keyboard entry, delta increment / decrement function and rotary control Accuracy As frequency standard Output Level N-Type socket: −141 dBm to −21 dBm Range BNC socket: −115 dBm to +5 dBm (usable to +7 dBm)
Page 32 GENERAL INFORMATION Amplitude Modulation - Internal Frequency range 400 kHz to 1.05 GHz AM depth range 0 to 99 % Resolution Indication 2 digits Setting Keyboard entry, delta increment / decrement function and rotary control Accuracy For carrier frequencies from 1.5 MHz to 400 MHz: ±7% ±1 digit, for mod freq of 1 kHz, ±10% ±1 digit for mod freq of 50 Hz to 5 kHz, ±15% ±1 digit, for mod freq of 50 Hz to 15 kHz...
Page 33: Audio Analyzer
GENERAL INFORMATION Audio analyzer Audio Voltmeter Input Impedance Nominally 1 MΩ in parallel with 40 pF Frequency Range DC and 50 Hz to 50 kHz AC only 50 Hz to 50 kHz Polarized DC (below 1 Hz) Level Ranges 0-100 mV to 0-30 V RMS in a 1,3,10 sequence Digital readout also in mW, dBm, dBV, dBr (user-selectable) External load R selectable compensation for 4, 8, 16, 75, 100, 150, 300, 600 ohm...
Page 34 GENERAL INFORMATION Audio Oscilloscope Operating Modes Single with digital storage on screen or repetitive sweep Frequency Range DC to 50 kHz, 3 Hz to 50 kHz AC coupled Voltage Range 10 mV to 20 V per division in a 1, 2, 5 sequence ±5 % of full scale Voltage Accuracy ±75, 30, 15, 6, 3 and 1.5 kHz deviation full scale, ±10 % accuracy...
Page 35: Transmitter Measurements
GENERAL INFORMATION Transmitter measurements RF Frequency Meter Frequency Range 100 kHz to 1.05 GHz (manual tune) 10 MHz to 1 GHz (auto-tune) Resolution 1 Hz or 10 Hz, up to 1050 MHz, selectable 0.1 Hz, 1 Hz, 10 Hz up to 999 MHz, selectable Indication Up to 10 digits As frequency standard ±resolution...
Page 36 GENERAL INFORMATION Resolution 1% AM Indication 2 digits and barchart Accuracy † ± 5% ±1 digit at 1 kHz ± 8.5% ±1 digit from 50 Hz to 10 kHz Demodulation Distortion † Less than 2 %, at 1 kHz & 30% AM, (CCITT Weighted) Residual AM Less than 1 % (300 Hz to 3.4 kHz) Frequency Modulation...
Page 37: Rf Spectrum Analyzer
GENERAL INFORMATION RF spectrum analyzer Frequency Range 100 kHz to 1.0 GHz Spans Continuously variable, 1 kHz / division to 100 MHz / division. 1, 2, 5, 10 increments. Start / Stop facility allows selection of infinitely variable span width. Resolution Bandwidth 300 Hz, 3, 30, 300 kHz, 3 MHz −50 dBm to +52 dBm...
Page 38: Audio Generators
GENERAL INFORMATION Audio generators Frequency Frequency Range 5 Hz to 33 kHz Setting Keyboard entry, delta increment / decrement function and rotary control Indication 5 digits Resolution 0.1 Hz below 3.25 kHz 1 Hz above 3.25 kHz Accuracy 0.01 Hz below 180 Hz 0.1 Hz above 180 Hz Level Level Range...
Page 39: General
GENERAL INFORMATION General Keyboard and Display Logical color coded keyboard with bright high resolution fast LCD Display size 160 x 85 mm RS232C RS232C interface is provided for printing and remote instrument control. Connector 9 way male 'D' Type Power Requirements AC Supply Voltage 100 V to 240 V~ 108 V to 118 V~...
Page 40: Options And Accessories
±0.5 dB at 200 Hz to 5 kHz, ±2 dB at 100 Hz to 20 kHz Accuracy of 1:1 input:output ratio: ±1% at 1 kHz ± accuracy of 2944B Maximum input: 5 V RMS maximum at 200 Hz to 5 kHz,...
Page 41 GENERAL INFORMATION GPIB (Option 5) For printing, remote instrument control or for programming of user-defined test sequences. Complies with the following subsets defined by IEEE488: Capability SH1, AH1, T6, L4, SR1, RL1, E1, DC1, DT0 SSB Demodulator (Option 8) The SSB demodulator allows signals to be demodulated either via the intenal loudspeaker or via the accessory socket.
Page 42 GENERAL INFORMATION Optional Accessories 44991/145 Microphone with PTT 54431/023 20 dB AF attenuator (BNC) 46884/728 Rack Mounting Kit 54421/001 Antenna BNC 46662/779 Soft carrying case (suitable for all 294x except early units being used with external battery) 46662/571 Soft carrying/operational case 46662/616 Soft carrying/operational case for use with Option 30...
Page 43: Chapter 2 Installation
Chapter 2 INSTALLATION Contents Introduction............................ 2-2 Initial visual inspection of new instruments................... 2-2 Ventilation ............................. 2-2 Operational case (46662/571) shoulder strap................. 2-3 Bail arm option ........................2-3 Power requirements ........................2-3 Fuses .............................. 2-3 Class I power cords (3-core)....................2-4 Connecting to a DC supply and fitting batteries ................
Page 44: Introduction
INSTALLATION Introduction This chapter deals with preparing the Service Monitor for use for the first time and with the checks to be made when the Service Monitor may have been used under unknown conditions. The latter situation could well apply where the Service Monitor is used by several users for differing tasks.
Page 45: Operational Case (46662/571) Shoulder Strap
INSTALLATION Operational case (46662/571) shoulder strap The shoulder strap supplied with the operational case should be attached to the front handles of the Service Monitor. When fitting the strap, always loop the tails of the strap through the buckles in the reverse direction.
Page 46: Class I Power Cords (3-Core)
In the event that a molded plug has to be removed from a lead, it must be disposed of immediately. A plug with bare flexible cords is hazardous if engaged in a live socket outlet. Power cords with the following terminations are available from Aeroflex Ltd. Please check with your local sales office for availability.
Page 47 INSTALLATION Continental Europe EARTH Country IEC 60320-1 plug Aeroflex part number Europe Straight through 23422/006 LIVE Europe Right angled 23422/007 NEUTRAL EARTH CONTINENTAL EUROPE C3512 The Continental European lead is fitted with a right angle IEC83 standard C4 plug (CEE 7/7) which allows it to be used in sockets with either a male earth pin (standard C 3b) or side earth clips (standard C 2b) the latter is commonly called the German ‘Schuko’...
Page 48: Connecting To A Dc Supply And Fitting Batteries
If the Test Set has been supplied with a battery pack, this will have been fitted before shipping. The battery pack should not require any attention over its expected life. If you do suspect a problem with the battery pack contact the nearest Aeroflex regional office.
Page 49: Accessory Socket Connections
INSTALLATION Accessory socket connections ° The accessory socket located on the front panel, is of the 7 pin DIN, 45 configuration. The function of each of the pins on this socket is shown in the following table. The pin numbering is shown in Fig.
Page 50: Table 2-2 Accessory Socket Logic And Applications
INSTALLATION Table 2-2 Accessory socket logic and applications Accessory Pin 1 Pin 3 Pin 6 Nothing connected High High High Microphone (press to talk) High High External power: Auto zero High External power: Peak power High High External power: CW power High High Refer to Chapter 3, Operation, for details of using the socket.,...
Page 51: Remote Control Connections
INSTALLATION Remote control connections RS232 The serial port connection requires a 9 way female ‘D’ Type connector. This should be correctly fitted to appropriate cable and the locking screws should be used to prevent undue strain from being applied to the connector housing. The pin connections are listed below and the pin locations shown in Fig.
Page 52: Gpib
INSTALLATION GPIB When the optional GPIB interface unit has been fitted, connections are made to it using a 24-way IEEE 488 male connector. If a stackable connector is used in order to interconnect more than two pieces of equipment, ensure that no physical damage to the Service Monitor connector will result. The pin connections are listed below and the pin locations shown in Fig.
Page 53: Self Tests And Acceptance Tests
INSTALLATION Self tests and acceptance tests The service monitor incorporates a self test program which allows users to verify its condition at any time. This program is described below. When it is necessary to prove that the performance of the Service Monitor meets the published performance data, the Acceptance tests, described in Chapter 5, should be carried out.
Page 54: Using The Service Monitor
INSTALLATION Test No. 15 FM deviation. 50 kHz This test checks the signal generator FM deviation against the modulation meter reading. Related set-ups. Frequency 10 MHz, level −26 dBm, IF bandwidth 300 kHz, audio bandwidth 0.3 to 3.4 kHz, FM demodulation. The functions verified by the above tests are: Signal generator FM accuracy, modulation meter FM accuracy, modulation generator (audio generator) level accuracy...
Page 55: Routine Maintenance
INSTALLATION Routine maintenance Ventilation fan and filter The ventilator fan on the rear of the Service Monitor is fitted with a filter to prevent the ingress of foreign matter into it. This should be inspected and cleaned at regular intervals. The procedure for this is as follows: Disconnect the Service Monitor from the mains supply and from any DC supply.
Page 56: Routine Safety Testing And Inspection
INSTALLATION Routine safety testing and inspection In the UK the ‘Electricity at Work Regulations’ (1989) section 4(2) places a requirement on the users of equipment to maintain it in a safe condition. The explanatory notes call for regular inspections and tests together with a need to keep records. The following electrical tests and inspection information is provided for guidance purposes and involves the use of voltages and currents that can cause injury.
Page 57: Insulation Tests
The above information is provided for guidance only. Aeroflex Ltd designs and constructs its products in accordance with International Safety Standards such that in normal use they represent no hazard to the operator. Aeroflex Ltd reserves the right to amend the above information in the course of continuing its commitment to product safety.
Page 58: Chapter 3 Local Operation
Chapter 3 LOCAL OPERATION Contents About this chapter .......................... 3-3 Front panel layout .......................... 3-4 Rear panel controls and connectors ....................3-8 Getting started..........................3-9 (Applying power and selecting test modes)................3-9 Test mode screens and menus...................... 3-10 HELP/SETUP ........................3-11 Bar charts .............................
Page 59 LOCAL OPERATION DCS.............................. 3-78 Overview..........................3-78 DCS receiver decoder testing ....................3-79 DCS transmitter encoder testing ................... 3-80 DTMF ............................3-81 Overview..........................3-81 Tx test DTMF tones function....................3-81 Rx test DTMF tones function ....................3-82 Dx test DTMF tones function ....................3-83 AF test DTMF tones function....................
Page 60: About This Chapter
LOCAL OPERATION List of figures Fig. 3-1 Front panel........................3-4 Fig. 3-2 Typical displays....................... 3-5 Fig. 3-3 Rear panel layout, (with optional GPIB fitted..............3-8 Fig. 3-4 AF Filter HELP/SETUP page ..................3-12 Fig. 3-5 Relationship of measurement and number of samples ..........3-18 Fig.
Page 61: Front Panel Layout
LOCAL OPERATION Front panel layout communications service monitor 2944B REMOTE ANTENNA HELP/ LOCAL SETUP FREQ TEST 1W MAX LEVEL TEST TEST dB V D 1W MAX SPEC DELETE RF IN/OUT ENTER DISPLAY SELECT TEST HOLD 150W MAX SINGLE AF GEN...
Page 62 LOCAL OPERATION B6012 Fig. 3-2 Typical displays The various keys on the front panel are grouped according to their use or located adjacent to associated items. Soft keys. To each side of the display screen are six unmarked keys. These are the ‘Soft’ keys referred to in the display description above.
Page 63 LOCAL OPERATION N type RF connector. This is dual function, input and/or output. A 20 dB Delta attenuator is incorporated within the Service Monitor. This interconnects the 'N type' connector with the RF generator output and the measuring receiver input, through the input/output selector switching. WARNING Hot surfaces Take care when touching the RF Input N Type connector after the application of high levels...
Page 64 LOCAL OPERATION DISPLAY HOLD key. To the left of the variable control is the [DISPLAY HOLD] key. Pressing this key at any time will freeze the display and prevent any adjustment to parameters displayed on the screen. The soft key menu changes to show two keys, [Store] and [Print]. The [Store] key, gives access to the screen and menu.
Page 65: Rear Panel Controls And Connectors
LOCAL OPERATION Rear panel controls and connectors CHARGE DC SUPPLY 100W MAX 11-32V T10AH250V AC SUPPLY 100-240V ~ SERIAL EXT MOD DEMOD EXT. STD 50-60Hz PORT 1/2/5/10MHz 108-118V ~ 50-400Hz 190VA MAX T2AL250V C6031 Fig. 3-3 Rear panel layout, (with optional GPIB fitted On the rear panel of the instrument are: AC power supply input connector.
Page 66: Getting Started
LOCAL OPERATION Getting started (Applying power and selecting test modes) In normal operation, the rear panel ON/CHARGE switch is set to the ON position. When the front panel SUPPLY switch is pushed in, the instrument powers up from either an AC supply or a DC supply provided by the optional internal battery.
Page 67: Test Mode Screens And Menus
LOCAL OPERATION Test mode screens and menus The five test modes are selected by pressing the appropriate MODE key. These are light blue, with dark blue lettering. (Item 16 in Fig. 3-1, Front panel). Select each in turn and observe the display presented.
Page 68: Help/Setup
LOCAL OPERATION HELP/SETUP Pressing the [HELP/SETUP] key, at any time, will display the screen shown in fold out diagram (1-0), or a variation of it. Displaying the HELP/SETUP screen does not interrupt any ongoing operation or test. The center panel of the screen lists the following information: Serial number of the Service Monitor Software fitted, with the version codes and part numbers.
Page 69 LOCAL OPERATION AF Filters The AF Low pass and band pass filters available for the Rx TEST mode, for the AF TEST mode and for the modulation meter within the Tx TEST mode can be customized from the setup page accessed from this key.
Page 70: Remote Control
LOCAL OPERATION Band pass filters The four band pass filters can each be customized to your requirements by selecting low pass and high pass elements from the as required. The High pass element can be either 50 Hz or 300 Hz, the low pass element can be any of the four preset low pass filters.
Page 71 LOCAL OPERATION Power Up From Successive presses of this key will toggle through the options available for configuration of the Service Monitor at ‘Power Up’. Last Used Store 0 is loaded with the current settings each time power is removed from the instrument. With Store 0 this selection made, the instrument will power up to the same settings as when power was removed, whether this was by user action or through power failure.
Page 72 LOCAL OPERATION RF Setup page RF Counter Resolution: The RF counter resolution can be set to 0.1 Hz, 1 Hz or 10 Hz. Selecting 1 Hz will slow the screen update rate by a factor of 10:1, selecting 0.1 Hz will slow it by a factor of 100:1. The choice is made by stepping through the three options using the soft key adjacent to the text.
Page 73 LOCAL OPERATION Rx = Tx Offset Freq: A setup option within the Tx TEST mode (Rx=Tx) will set the signal generator used for receiver testing to the measured frequency of a transmitter being tested. An Rx=Tx offset frequency entered here will cause the signal generator frequency to differ from the measured transmitter frequency by the offset frequency.
Page 74 LOCAL OPERATION AF Setup page This page allows the following optional settings to be selected: Audio Level Measured in: Repeated presses of the adjacent soft key will toggle through Volts, dBm, dBV Watts highlight the selection in inverse video. The level of a signal applied to the AF input socket is measured in terms of the selected option. This will then apply to all subsequent measurements.
Page 75 LOCAL OPERATION AF Distn, SINAD, S/N Averages: When distortion or SINAD tests are made to receivers using the Rx TEST mode or AF TEST mode, the results displayed are obtained by averaging the results of a number of measurements. This allows the user to balance the speed of testing against greater repeatability of measurement. The number of measurements made can be set within the range 1 to 20 by entering the required figure using the data input keys.
Page 76: Bar Charts
LOCAL OPERATION Bar charts The bar charts used to indicate signal levels can be set to autorange or to user selected ranges. The current state of each bar chart is shown by either an (for Autoranging) or (for Held range) at the left of it.
Page 77: Using The Test Modes
LOCAL OPERATION Using the test modes Brief descriptions As the Service Monitor is a duplex instrument, the RF signal generator and the receiver circuits are able to operate simultaneously. This allows mobile transceivers to be tested under their normal operating conditions, with both their receiver section and transmitter section functioning. By selecting a particular test mode on the Service Monitor, one or both sections of the transceiver can be studied.
Page 78 LOCAL OPERATION Press To Talk facility A mode switching capability is provided by the ‘Microphone with PTT switch’ optional accessory. Performance data, optional accessories in Chapter 1. With ‘microphone’ selected as the external modulation source and the instrument operating in the Tx TEST mode, pressing the PTT switch causes the instrument to switch to the Rx TEST mode.
Page 79: Tx Test (Transmitter Testing)
LOCAL OPERATION Tx test (transmitter testing) Overview The Communications Service Monitor has been designed to test the performance of mobile communication equipment. This section explains the use of the Tx TEST mode. Typical uses are: • Performance checking following manufacture •...
Page 80: Connections
LOCAL OPERATION Connections VOLTMETER POWER- METER 20dB DISTORTION METER ATTENUATOR MODULATION METER FILTERS COUNTER TONES COUNTER OSCILLOSCOPE SERVICE AUDIO MONITOR RF IN AMPLIFIER ANTENNA ALTERNATIVE CONNECTIONS Tx UNDER TEST C3373 Fig. 3-6 Transmitter test connections The transmitter and the Service Monitor are connected as shown in Fig. 3-6, Transmitter test connections.
Page 81: Setting Up
LOCAL OPERATION The Audio frequency input connection to the transmitter must be to the audio input, in place of the usual microphone input. This connection will vary for differing types of equipment. Points to note are: • The microphone must be disconnected, as any input from it would affect the performance of the test.
Page 82 LOCAL OPERATION Manual frequency setting Range; 100 kHz to 1.05 GHz With the legend highlighted, data can be entered from the keyboard to the Tx FREQ Tx FREQ parameter. As the entry can only be a frequency setting, it is not necessary to select the orange [FREQ] key.
Page 83 LOCAL OPERATION Tx power The [Tx Power] key gives access to RF power measurement functions or associated functions. Broad Band or Narrow Band power The [Broad/Narrow] key selects which of the RF power measurement methods is operative. The selected method is indicated on the display by the letters BB or NB to the right of the digital power reading.
Page 84 LOCAL OPERATION IF bandwidth The IF bandwidth of the Service Monitor receiver circuits can be selected from the following options: 300 Hz 3.0 kHz 30 kHz 300 kHz Press the [IF Filter] key. The right hand soft keys change, to allow selection of IF bandwidth filters as shown above.
Page 85 LOCAL OPERATION Audio distortion measurement The Service Monitor is able to measure signal noise and distortion against the following parameters: Signal to noise SINAD Percentage ratio level distortion Press the [Dist S/N] key. The right hand soft keys change, to allow selection of S/N, SINAD and distortion measurements.
Page 86 LOCAL OPERATION More (FM deviation pk/rms, Inst dBr, dBr Ref, Abs Meas) Press the [More] key. The right hand soft keys change, to allow selection of the FM deviation and AM modulation measurement modes. FM Dev Pk/rms Toggles between measuring FM modulation with RMS or with peak detectors. The measurement mode –...
Page 87 LOCAL OPERATION Audio generator setup Freq. range 5 Hz to 33 kHz Level range 0.1 mV to 4 V rms Shape option Sine or square To set up the audio generators in order to modulate the transmitter, press the [Audio Gen] key. This will display the audio setup menu shown in fold out diagram (2-4).
Page 88: Making Measurements
LOCAL OPERATION Making measurements This section describes the actions needed to make measurements of each parameter associated with transmitter testing. All tests are described individually as ‘one off’ tests, but in practice, once set up, all active parameters will be measured simultaneously with continuous updating and the results displayed using the selected measurement units.
Page 89: External Attenuators
LOCAL OPERATION WARNING Hot surfaces Take care when touching the RF Input Type N connector after the application of high levels of continuous power. If 50 W is applied for a prolonged period, the temperature of the connector can become excessive. With the monitor in the Tx TEST mode, and the transmitter connected to the monitor as described above, key up the transmitter.
Page 90 LOCAL OPERATION Transmitter frequency The digits adjacent to the legend on the Tx TEST display refer to the frequency to which Tx Freq the Service Monitor receiver circuits are tuned. If the frequency of the transmitter is known, this figure can be entered manually. This is done by firstly pressing the [Tx Freq] key in the Tx TEST mode menu and then entering the figure using the data input keys.
Page 91 LOCAL OPERATION Modulation characteristics Modulation frequency response and Companding/limiting The requirements of individual users will vary but the principle of the tests will be the same. A signal having a known level and frequency is applied to the AF input of the transmitter and the level of modulation produced is measured.
Page 92 LOCAL OPERATION *DUPLEX* All of the above information relating to modulation characteristics and frequency response testing also applies to tests made using the Dx TEST mode. The oscilloscope facility is not available when in Dx TEST mode. Modulation distortion Distortion Products Filter Response Signal Noise...
Page 93 LOCAL OPERATION The SINAD level is then calculated according to the formula: SINAD = 20 S N D 20 log To obtain the distortion factor of a signal at the output of a transmitter the output level is measured and noted as for SINAD level measurement. A notch filter as used for SINAD measurement is used to make a second reading, which comprises the same values as for the second SINAD measurement.
Page 94: Rx Test (Receiver Testing)
LOCAL OPERATION Rx test (receiver testing) Overview The Communications Service Monitor has been designed to test the performance of mobile communication equipment. This section explains the use of the Rx TEST mode. Typical uses are: • Performance checking following manufacture •...
Page 95: Connections
LOCAL OPERATION Connections VOLTMETER FILTERS DISTORTION METER 20dB GENERATOR ATTENUATOR TONES COUNTER OSCILLOSCOPE RF OUT SERVICE MONITOR ALTERNATIVE CONNECTIONS Rx UNDER TEST C3374 Fig. 3-8 Receiver test connections Before making any connections between the Service Monitor and the receiver ensure that the RF generator of the Service Monitor is .
Page 96: Setting Up
LOCAL OPERATION When testing the receiver section of a transceiver, ensure that the power output of the transmitter section will not exceed the power handling capability of the connector on the Service Monitor. Also ensure that the transceiver cannot be switched to ‘ ’...
Page 97 LOCAL OPERATION Output level setting Range N-Type connector, − − 135 dBm to 15 dBm; 0.04 mV to 40 mV pd − BNC connector, 115 dBm to +5 dBm; 0.4 mV to 400 mV pd (with uncalibrated overrange to +7 dBm) WARNING Hot surfaces Take care when touching the RF Input Type N connector after the application of high levels of...
Page 98 LOCAL OPERATION Modulation generators Set up one or both of the modulation generators for the required frequency, level and shape by using the soft keys and data input keys. When these and the de-emphasis filter are set to the required settings press the [Return] key to restore the menu.
Page 99 LOCAL OPERATION Pre-emphasis filter The pre-emphasis filter can be switched in or out of circuit after pressing the [Mod Gen] key. Pressing the [Pre-emph] key will toggle the pre-emphasis filter into and out of circuit. The time constant of the filter is 750 µs, giving an increase with frequency of 6 dB/octave. The legend is displayed when the filtering is in circuit.
Page 100: Af Input Level Measurement
LOCAL OPERATION AF input level measurement The measured level of signals applied to the AF INPUT connector can be displayed in volts, dBm, dBV or mW. The selection is made from the AF Setup page, as described under Audio Level Measured in: on page 3 17.
Page 101 LOCAL OPERATION Disables any active distortion measuring function and removes the distortion bar chart from the display. Hint. By disabling this function, the time taken to measure the remainder of the measurement functions is shortened thereby reducing the update time. Selects Signal to noise ratio as the measurement method.
Page 102 LOCAL OPERATION Audio peak hold Press the [Audio Meter] key, followed by the [Audio Pk Hld] key. The highest transmitted audio level is held on the display. An inverse video red 'P' in displayed near to power readings that are peak-held, in receiver, duplex and audio screens. Instrument dBr level, dBr ref Press the [Audio Meter] key, followed by the [More] key.
Page 103: Making Measurements
LOCAL OPERATION Making measurements (Examples of receiver tests). The procedure for making each of the tests listed in the receiver testing overview, above, follows. Some of the tests may require separate operations and others will only require a reading to be made.
Page 104 LOCAL OPERATION 20 dB weighted SINAD sensitivity This test is very similar to the 12 dB SINAD sensitivity test The differences are firstly that the SINAD level specified is 20 dB and secondly that a psophometric weighting filter is included in the test path. This filter imposes a frequency response characteristic to the signal similar to that of the human ear response.
Page 105 LOCAL OPERATION Basic sensitivity test To carry out a basic sensitivity test on an AM receiver: Set the RF generator frequency to that required by the test program. This setting can be entered using the data input keys or set using the Rx=Tx facility discussed under Tx mode. The RF generator can be switched off during the setup operation if required, by pressing the orange [ON OFF] function key.
Page 106 LOCAL OPERATION Selectivity 2041 Signal Generator 'ADJACENT CHANNEL' SIGNAL Coupler Service Monitor 'ON CHANNEL' SIGNAL Under DE MODULATED AF TEST SIGNAL Test C3375 Fig. 3-9 Selectivity test setup Selectivity tests are measurements of the capability of a receiver to differentiate between a wanted signal and an unwanted signal, usually that transmitted on an adjacent channel.
Page 107 LOCAL OPERATION Blocking (or desensitization) Blocking (or desensitization) is an undesirable response by a receiver to a signal whose frequency is spaced from the wanted signal by a frequency difference greater than the adjacent channel spacing. The interfering signal will enter the IF pass band of the receiver with sufficient strength to cause the automatic gain control to operate.
Page 108 LOCAL OPERATION The procedure for measuring the IF rejection ratio is similar to that used to measure image frequency rejection and uses the same setup. The RF reference level is found at the RF frequency to which the receiver is tuned, then the RF generator is retuned to the IF frequency of the receiver under test.
Page 109: Dx Test (Duplex Testing)
LOCAL OPERATION Dx test (duplex testing) TONES GEN. POWER METER METER COUNTER COUNTER DIST- ORTION FILTERS METER SERVICE MONITOR 20dB VOLT- ATTEN. METER BNC RF ANTENNA RF IN IN/OUT TRANSCEIVER UNDER TEST C3376 − Fig. 3 11 One port duplex test setup Overview With the Dx TEST mode selected, the screen and menu shown in fold out diagram (4−0) is displayed.
Page 110 LOCAL OPERATION TONES GEN. POWER METER METER COUNTER COUNTER DIST- ORTION FILTERS METER SERVICE MONITOR 20dB VOLT- ATTEN. METER ANTENNA TRANSCEIVER UNDER TEST SERVICE SERVICE MONITOR MONITOR 20dB 20dB ATTEN. ATTEN. ANTENNA ANTENNA C3377 − Fig. 3 12 Alternative two port duplex setups 3-54...
Page 111: Spectrum Analyzer
LOCAL OPERATION Spectrum analyzer See Fig. 3−13, Spectrum analyzer test setup, and Fig. 3−14, Spectrum analyzer test setup using the tracking generator. LOCAL SWEEP SERVICE OSCILLATOR GENERATOR MONITOR 20dB INPUT/ RECEIVER LOG. OSCILLO- ATTEN. OUTPUT SCOPE CIRCUIT DETECTOR AMPLIFIER SWITCHING 'N' TYPE ANTENNA RF OUT...
Page 112: Overview
LOCAL OPERATION Overview With the SPEC ANA mode selected, the screen and menu shown in fold out diagram (5−0) is displayed. In the SPEC ANA mode, the sweep generator causes the acceptance frequency of the analyzer input circuits to repeatedly sweep over the selected frequency range. The level of RF signal present at the active RF input connector is measured at regular points along the sweep and plotted progressively across the display, thus building up a graph of RF level against frequency.
Page 113: Reference Level
LOCAL OPERATION Start frequency Pressing the [Start Freq] key allows the required start point to be entered using the data entry keys. The variable control is active when the legend is highlighted. Start Note that when using the variable control the span of the display remains constant. Therefore the stop frequency will follow any change to the start frequency.
Page 114 LOCAL OPERATION Vertical scale The vertical scale can be displayed with a range of 10 dB/division or 2 dB/division. To select the vertical range, press the [Vert Scale] key, which will cause the menu shown in fold out diagram (5-2) to be displayed. Repeated presses of the [10 dB/2 dB] key will toggle the options, with the current choice being shown in the display.
Page 115 LOCAL OPERATION Tracking generator facility The tracking generator facility uses the RF generator of the Service Monitor to provide a tracking signal source. This allows the spectrum analyzer to show the frequency response of frequency dependent circuits such as filters. The frequency response of any circuit connected between the tracking generator output and the spectrum analyzer input will be displayed.
Page 116 LOCAL OPERATION Look and Listen LOCAL SWEEP OSCILL- GEN. ATOR OSCILLO- RECEIVER LOG. SWITCH- SCOPE CIRCUITS DET. AMP. AM/FM 20 dB AUDIO ATTEN. DEMOD AMP. C6055 Fig. 3-15 Spectrum Analyzer setup, Look and Listen function The optional Look and Listen facility allows the instrument to be used for ‘OFF-AIR’ monitoring of transmissions while examining the area of radio spectrum on which the transmission being monitored is centered.
Page 117 LOCAL OPERATION Setting up Pressing the [Look & Listen] key from the menu selects this option. The SPECTRUM ANALYZER menu shown in fold out diagram (5-6) is displayed. Center Freq and Span setting When operating in the ‘Look & Listen’ mode, the spectrum display is defined only by the settings.
Page 118 LOCAL OPERATION Resolution bandwidth selection The resolution bandwidth for the display can be selected from the following through the [Res BW] key: Auto 3 kHz 30 kHz 300 kHz Res BW With automatic resolution bandwidth selected, the resolution bandwidth is dependent on the sweep span, as shown below: Span Setting Resolution Bandwidth...
Page 119: Af Test (Audio Frequency Testing)
LOCAL OPERATION AF test (audio frequency testing) Overview TONES COUNTER DIST- ORTION FILTERS METER SERVICE MONITOR VOLT- METER AMPLIFIER UNDER TEST C3380 Fig. 3-16 Audio test setup To enter the AF TEST mode press the blue [AF TEST] key. This will cause the screen and menu shown in fold out diagram (6-0) to be displayed.
Page 120: Setting Up
LOCAL OPERATION Setting up The audio generators are the signal sources for AF testing. Good practice is to disable the source until tests are set up. This is achieved by selecting each of the generators in turn and pressing the orange [ON/OFF] function key to display adjacent to each of the generator's output data on the display.
Page 121: Distortion Measurement
LOCAL OPERATION Distortion measurement The distortion measuring facilities of the monitor are available within the AF TEST mode. Pressing the [Audio Meter] key, to change the soft keys as shown in fold out diagram (6 3), then pressing the [Dist/S-N]soft key, accesses the distortion measurement menu shown in fold out diagram (6-3-2).
Page 122 LOCAL OPERATION Dist’n Selects distortion percentage as the measurement method. The AF generator is set to 1 kHz and the 1 kHz distortion notch filter is switched alternatively in and out of circuit, with the signal level being measured by the AF voltmeter in each state. See Fig. 3-7 a, b, & c, Distortion level and signal to noise level measurements, on page 3-36.
Page 123: Incremental Adjustment Keys
LOCAL OPERATION Incremental adjustment keys General This section provides information on the use of the incremental adjustment keys. Other sections of this chapter have specific references to these keys; this section gives general information. The incremental adjustment keys are located under the variable control, with one pair designated FREQ, [ ] and [ ], the other pair designated LEVEL, [ ] and [ ].
Page 124: Assigning
LOCAL OPERATION Assigning The assignment of the incremental keys is shown in the display, along with the step value. To assign a parameter to a pair of keys, first select the parameter as if to change the value using the data input keys, but rather than entering a new value press the orange [ALT ∆] key. Now enter the value of the step to be incremented at each key press, followed by the correct terminator key.
Page 125: Tones
LOCAL OPERATION Tones Tones sub-mode Audio tones and digital code signals are used for many purposes within radio communication systems. The Service Monitor has a TONES mode accessed from the Tx TEST, Rx TEST, Dx TEST and AF TEST modes. This gives facilities for testing tone calling and control systems of the following types.
Page 126: Signal Routing
LOCAL OPERATION Signal routing The tones sub-mode can be entered from either Tx TEST, Rx TEST, Dx TEST or AF TEST modes. The encoded signal produced by the Service Monitor can be routed to the equipment under test in two ways: •...
Page 127: Sequential Tones
LOCAL OPERATION Sequential tones Overview Sequential tones signaling systems use sequences of audio tones to control various functions of a radio system. There are many systems in operation world-wide, all using up to 15 tones labeled with the hexadecimal digits 0 to E with ‘No Tone’ as F. Some systems make use of extended tones for certain functions.
Page 128 LOCAL OPERATION Fig. 3-18 RF Sequential tones encoder display, main menu Setting the Tones mode The display is divided into three areas. • At the bottom of the display is a table listing the frequencies allocated to the 15 tones, 0 to E. Above the table is shown the system type, i.e.
Page 129 LOCAL OPERATION Creating the tone sequence To create the required tone sequence, first press the [Enter Sequ] key to display the cursor in the tone sequence panel. Enter the required sequence by using any of the data entry keys 1 to 9, zero and the Hex digits A to E.
Page 130: Testing Sequential Tone Transmitters
LOCAL OPERATION Tone ON/OFF control When the screen or the screen is RF SEQUENTIAL ENCODER AF SEQUENTIAL ENCODER displayed, the sequential tones are turned on or off by the orange [ON/OFF] function key. If the sequential tones are ON and the Tx TEST, Rx TEST, Dx TEST or AF TEST mode selected, the tones will continue to be generated.
Page 131 LOCAL OPERATION The underlined tones are listed in the center of the display with an analysis of the parameters of each tone as below: • The measured frequency of each tone. • The percentage error from the true tone frequency. •...
Page 132: Ctcss
LOCAL OPERATION CTCSS The CTCSS tones system uses a continuous tone at a precise frequency, transmitted below the audio pass band, to un-squelch the receiver. Fig. 3-21 RF CTCSS encoder screen and menu Pressing the [CTCSS] key on the TONES selection screen will display the screen shown in Fig.
Page 133 LOCAL OPERATION Tone ON/OFF control When the screen or the screen is displayed, the RF CTCSS ENCODER AF CTCSS ENCODER tone is turned on or off by the orange [ON/OFF] function key. If the CTCSS tone is ON and the Tx TEST, Rx TEST, Dx TEST or AF TEST mode selected, the CTCSS tone will continue to be generated.
Page 134: Dcs
LOCAL OPERATION Overview Digitally Coded Squelch signaling is a system for addressing mobile radio transceivers from their base station by transmitting a code unique to the addressed transceiver for the duration of the transmission. The principles and limitations of the system provide 104 uniquely identifiable codes for use on any one RF channel.
Page 135: Dcs Receiver Decoder Testing
LOCAL OPERATION DCS receiver decoder testing To test the DCS decoder function of a mobile transceiver, set up and connect the Service Monitor with the mobile as described in the Rx testing section earlier in this chapter. Access the DCS facility within the RF tones mode by using the sequence, [Tones], [DCS]. The RF DCS Encoder screen and menu is displayed as shown in Fig.
Page 136: Dcs Transmitter Encoder Testing
LOCAL OPERATION Tone ON/OFF control When the screen or the screen is displayed, the tone is RF DCS ENCODER AF DCS ENCODER turned on or off by the orange [ON/OFF] function key. If the DCS tone is ON and the Tx TEST, Rx TEST, Dx TEST or AF TEST mode selected, the CTCSS tone will continue to be generated.
Page 137: Dtmf
LOCAL OPERATION DTMF Overview Dual Tone, Multi-Frequency. The DTMF tones function will generate and decode sequences, of up to 40 characters corresponding to the standard DTMF frequencies. The encoder allows the user to create characters sequences, which are routed to the AF GEN OUTPUT connector or to the RF generator modulators.
Page 138: Rx Test Dtmf Tones Function
LOCAL OPERATION Rx test DTMF tones function In the Rx TEST mode, with [Tones Out] set to , the encoder output is fed to the RF generator and the tones used to modulate the RF signal. The DTMF decoder within the receiver under test can then be tested.
Page 139: Dx Test Dtmf Tones Function
LOCAL OPERATION Tones modulation level The modulation level produced by each tone of the tone pair can be set independently. Pressing the [Lo Tone Level] key will highlight the legend . The modulation level Lo Tone Level: can then be set using the data entry keys. The modulation level produced by the tones is set using the [Lo Tone Level] or [Hi tone Level] key, followed by use of the data input keys.
Page 140 LOCAL OPERATION Tones ON/OFF control When the screen or the screen is displayed, the tone is RF DTMF ENCODER AF DTMF ENCODER turned by the orange [ON/OFF] function key. If the DTMF tone is and the Tx TEST, Rx TEST, Dx TEST or AF TEST mode selected, the DTMF tone will continue to be generated.
Page 141: Pocsag
LOCAL OPERATION POCSAG Overview The POCSAG system is an international standard for radio pager operation. The system operates by broadcasting digital messages on a common frequency, only alerting the addressed radio pager when the transmitted address matches that of the pager. The signal transmitted consists of two main elements, the address and the message.
Page 142 LOCAL OPERATION The radio identification code ( ) of the radio pager is set by the user. This is entered into the Service Monitor as a seven digit decimal number corresponding to the 21 bit address code of the radio pager. The number is unique to the radio pager and will have a maximum decimal equivalent of 2097151.
Page 143: Testing A Radio Pager
LOCAL OPERATION Testing a radio pager Radio pagers are self-contained units with no external antenna provision, therefore it is not possible to make a direct RF connection between the Service Monitor and the pager. The Service Monitor output can be taken from the BNC RF output connector using the telescopic antenna accessory (part no.
Page 144: Oscilloscope
LOCAL OPERATION Oscilloscope The digital oscilloscope option is available from within the Tx TEST, Rx TEST and AF TEST modes. There are two display functions: The standard display with a viewing area of approximately 38 × 65 mm. The expanded display with a viewing area of approximately 63 × 90 mm. The oscilloscope display may or may not be shown when the Tx TEST, Rx TEST or AF TEST modes are selected.
Page 145: Expanded Display
LOCAL OPERATION Expanded display With the expanded display selected, the area of the display available for digital readings is limited. The following table shows the data that can be displayed in each test mode. Tx Test Rx Test AF Test Tx FREQ OFFSET POWER...
Page 146: Stores, Settings/Results
LOCAL OPERATION Stores, settings/results Overview A section of the non-volatile RAM in the Service Monitor is designated as a user store for instrument settings and results. 'Power Down' and 'Factory Pre-set' settings are also held in this area of memory. There are two routes through which the user memory can be accessed, depending on the action to be performed.
Page 147: Storing
LOCAL OPERATION Storing Storing settings To store settings, make sure that all the parameters, selections, bar chart ranges and other settings, relevant to the intended work, are set as required. Then proceed as follows: Press the orange [MEM] key and the STORE/RECALL screen will be displayed. Ignore the flashing inverse video message.
Page 148: Titling Store Locations
LOCAL OPERATION Deleting store contents To delete the contents of an unprotected store location, proceed as follows: Press the [Delete] key. The inverse video message, 'Delete Store No.' will be displayed. Key in the two digit address of the location to be deleted, using the data entry keys. The contents will be deleted as soon as the second digit is keyed and the location address list will show the location as 'Empty'.
Page 149: Printer
LOCAL OPERATION Printer An RS232 printer can be driven by the Service Monitor when connected to the SERIAL PORT on the rear panel. Complete screen images and hard copy of stored test results can be printed. The serial port must be set to the printer option through the [HELP/SETUP], [Setup] key sequence, followed by the [Remote Control] key.
Page 150 LOCAL OPERATION Accessory port (rear optional) As well as the parallel printer output, this option also provides an accessory port that allows the control of external devices by logic control from the instrument. Fig. 3-28, Rear accessory port socket connections, shows the pin numbering of the socket and Table 3-2, Rear accessory port , shows the function of the socket connections.
Page 151 LOCAL OPERATION Table 3-2 Rear accessory port connections Contact Function +5 V Logic line 3 or logic contact 3(a) Logic line 2 or logic contact 2(a) Logic line 1 or logic contact 1(a) Logic line 0 or logic contact 0(a) logic contact 3(b) Logic contact 2(b) Logic contact 1(b)
Page 152 LOCAL OPERATION HELP/ LOCAL SETUP HELP/ TEST SETUP TEST TEST SPEC TEST SINGLE CHARGE B6032 Test mode screen and menu (1.0). HELP/SETUP with lower levels. 3-97...
Page 153 LOCAL OPERATION HELP/ LOCAL SETUP TEST TEST TEST TEST SPEC TEST SINGLE CHARGE B6033 Test mode screen and menu (2.0). Tx TEST with next levels. 3-99...
Page 154 LOCAL OPERATION HELP/ LOCAL SETUP TEST TEST TEST TEST SPEC TEST SINGLE B6034 Test mode screen and menu (3.0). Rx TEST with next levels. 3-101...
Page 155 LOCAL OPERATION HELP/ LOCAL SETUP TEST TEST TEST TEST SPEC TEST SINGLE CHARGE B6035 Test mode screen and menu (4.0). Dx TEST with next levels. 3-103...
Page 156 LOCAL OPERATION HELP/ LOCAL SETUP SPEC TEST TEST TEST SPEC TEST SINGLE CHARGE Peak Find B6036 Test mode screen and menu (5.0). SPEC ANA with next levels. 3-105...
Page 157 LOCAL OPERATION HELP/ LOCAL SETUP TEST TEST TEST TEST SPEC TEST SINGLE CHARGE B6037 Test mode screen and menu (6.0). AF TEST with next levels. 3-107...
Page 158: Chapter 4 Technical Description
Chapter 4 TECHNICAL DESCRIPTION Contents Overview............................4-2 Power supply .......................... 4-2 The display..........................4-3 Tx test mode........................... 4-7 Modulation sources......................... 4-7 Audio generators......................4-7 Data generator........................4-8 Receiver circuits ........................4-9 Input switching ........................ 4-9 Broad band power meter....................4-9 Overload detection......................
Page 159: Overview
TECHNICAL DESCRIPTION Overview This simple description is provided to give the user an insight into the working of the Service Monitor at the block diagram level. See Fig. 4-2 Simplified block diagram. The power supply and display unit are described first. The functional circuit blocks of each test mode are then described in sequence.
Page 160: The Display
TECHNICAL DESCRIPTION The AC supply enters the instrument through a connector on the rear panel and passes through a fuse and supply on/off switch. The supply then enters the power supply module where it is fed to a bridge rectifier in the AC-DC converter to produce an unregulated DC supply. The voltage of this will depend on the supply voltage as the full range of AC input voltage is covered without range switching.
Page 161 TECHNICAL DESCRIPTION A11/1 SEE FIG. BROADBAND DETAILED POWER BLOCK METER DIAGRAM 1359.3 MHz 79.3 MHz 10.7 MHz (10.625 MHz SSB) MIXER MIXER MIXER TO A/D A11/1 A4/1 A4/1 A4/1 A4/1 A4/1 DISPLAY INPUT/ INPUT OUTPUT SWITCHING 0-60dB 20dB TO SQUELCH ON SYSTEMS 1359.3 TO ONLY PRESENT...
Page 162: Tx Test Mode
TECHNICAL DESCRIPTION Tx test mode When operating in the Tx TEST mode the Service Monitor has to provide a source of modulation for the transmitter being tested and also analyze the RF output signal from the transmitter. Modulation sources The modulating signal is provided by one or both of the audio generators or the data generator and is taken from the AF output connector on the front panel.
Page 163: Data Generator
TECHNICAL DESCRIPTION Each of the circuits function in the following manner: Instruction as to the frequency of the required signal is latched into a programmable array device, which generates a repetitive digital output sequence recurring at the required frequency. The digital output from the programmable array is transferred as a stream of 13 bit parallel data into an EPROM.
Page 164: Receiver Circuits
TECHNICAL DESCRIPTION Receiver circuits Input switching OVERLOAD WARNING CIRCUIT OVERLOAD FROM TO FIRST RF OUT DETECTOR RF GENERATOR FREQUENCY VIA ATTENUATOR CHANGER VIA ATTENUATOR 0/10dB ATTEN. 25kHz POWER LEVEL 9mV FOR +7dBm AT ’N TYPE’ INPUT OVERLOAD WARNING CIRCUIT ’N’ TYPE 20dB 25kHz RF IN/OUT...
Page 165: Overload Detection
TECHNICAL DESCRIPTION Overload detection An overload detection circuit is activated if power in excess of 1.0 W is applied to the BNC antenna connector or to the BNC RF output connector. The overload detect lines are activated and trigger the overload warning message from the microprocessor. A temperature sensor, in physical contact with the 20 dB pad on the ‘N type’...
Page 166: Second Local Oscillator
TECHNICAL DESCRIPTION Second local oscillator The local oscillator signal for the second mixer has a frequency of 1.280 GHz and is generated on the second and third oscillator board A9/1. This oscillator is a phase locked loop device, locked to the instrument's 10 MHz reference oscillator.
Page 167: Ssb Demodulator (Optional)
TECHNICAL DESCRIPTION SSB demodulator (optional) The single sideband demodulator circuits are all contained on the SSB demodulator board A15. When the SSB demodulation function is selected the first local oscillator of the Service Monitor is set to a frequency which will produce a final IF of 10.625 MHz (from an input frequency equal to the carrier frequency) rather than the 10.7 MHz IF produced for all other modes.
Page 168: Distortion/Sinad Filter
TECHNICAL DESCRIPTION Distortion/SINAD filter The 1.0 kHz active notch filter, used to make distortion percentage and SINAD measurements, is also on the audio processor board B1/2. This filter is switched into circuit to make comparison measurements against the unfiltered path. The additional distortion frequencies enabled by Option 29 are provided by an additional board that plugs into the audio processor board B1/2.
Page 169: Modulators
TECHNICAL DESCRIPTION Modulators The Rx TEST signal can be either AM or FM modulated. The selected modulation signal, from either or both of the AF generators, from the data generator or from an external source, is conditioned and level corrected within the modulation control circuits on the audio processor board B1/2.
Page 170: Oscilloscope Function
TECHNICAL DESCRIPTION Oscilloscope function When used in the Rx TEST mode, the oscilloscope displays the AF input signal fed to the AF input connector.. The signal is passed through a sensitivity control circuit for scope calibration before following the same path as used in the Tx TEST mode. Dx test mode The Dx TEST mode uses all the circuit elements described in the proceeding sections.
Page 171: Chapter 5 Acceptance Testing
Chapter 5 ACCEPTANCE TESTING Contents Introduction............................ 5-3 Results tables .......................... 5-3 Before starting ........................5-3 Test equipment........................5-4 RF output tests ..........................5-5 Carrier frequency accuracy..................... 5-5 RF output level ........................5-7 ALC linearity........................5-8 BNC output mode ......................5-8 Attenuator accuracy ......................
Page 172 ACCEPTANCE TESTING List of figures Fig. 5-1 Carrier frequency accuracy ..................... 5-5 Fig. 5-2 RF level set up......................... 5-7 Fig. 5-3 Attenuator accuracy test set up..................5-8 Fig. 5-4 Attenuator functional check .................... 5-9 Fig. 5-5 Carrier harmonics & spurious check ................5-10 Fig.
Page 173: Introduction
ACCEPTANCE TESTING Introduction Test procedures described in this chapter may be simplified and of restricted range compared with those that relate to the generally more comprehensive factory test facilities which are necessary to demonstrate complete compliance with the specifications. Performance limits quoted are for guidance and should not be taken as guaranteed performance specifications unless they are also quoted in the section Performance data in Chapter 1.
Page 174: Test Equipment
ACCEPTANCE TESTING Test equipment Description Minimum specification Example Frequency counter 400 kHz to 1.05 GHz. IFR* 2440 or 1 Hz resolution, external standard In/Out. EIP 25B RF power meter ± 0.1 dB from 10 MHz to 1 GHz. IFR* 6960/A/B + 6912 and 6920 sensor Measuring receiver...
Page 175: Rf Output Tests
ACCEPTANCE TESTING RF output tests Carrier frequency accuracy This check provides a conventional method of checking the signal generator frequency locking circuitry. It will confirm correct operation of phase lock loop and dividers. Overall accuracy is determined by the instrument's internal reference standard. Specification Frequency range: 400 kHz to 1.05 GHz...
Page 176 ACCEPTANCE TESTING Table 5-1 Carrier frequencies Frequency UUT area checked 2440 range 400.000 kHz Oscillator, bottom 1050.00000 MHz Oscillator, top 500.00000 MHz Oscillator, middle   188.88888 MHz 177.77777 MHz   166.66666 MHz 155.55555 MHz  Fractional N  144.44444 MHz 133.33333 MHz ...
Page 177: Rf Output Level
ACCEPTANCE TESTING RF output level Specification Level range: −127 dBm to −21 dBm (N-type socket) Accuracy: ± 2 dB up to 1 GHz Test equipment Description Minimum specification Example RF power meter IFR 6960/A/B + ± 0.1 dB from 10 MHz to 1 GHz 6920 sensor Measuring HP 8902A +...
Page 178: Alc Linearity
ACCEPTANCE TESTING ALC linearity Refer to Results table 5-3 on page 5-37. Connect the sensor to the N-type output socket, as shown in Fig. 5-2. Set the UUT to [RF Gen], [LEVEL] −21 dBm, [∆ INC] 1 dB, [FREQ] 10 MHz. Increment the RF output of the UUT in 1 dB steps down to −38 dBm, ensuring that the indication on the power meter is within ±2 dB of each level set.
Page 179: Alternative Attenuator Functional Check
ACCEPTANCE TESTING Alternative attenuator functional check Spectrum analyzer N TYPE OUTPUT C6042 Fig. 5-4 Attenuator functional check Connect the test equipment as shown in Fig. 5-4. Set the UUT to [Rx TEST], RF IN/OUT [SELECT] N-type output, [RF Gen], [LEVEL] −27 dBm, [∆ INC] 10 dB, [FREQ] 251 MHz. All modulation and noise measurements should be switched OFF.
Page 180: Spectral Purity
ACCEPTANCE TESTING Spectral purity Harmonics, spurious, RF carrier leakage, residual FM. Specification 400 kHz to 1 GHz Carrier range: Harmonics: Better than −20 dBc. Spurious signals Better than −30 dBc (± 10 kHz to 1.5 MHz offset from carrier frequency or over range 600 - 700 MHz).
Page 181 ACCEPTANCE TESTING (5) Refer to Results table 5-7 on page 5-39. Set the UUT to [Rx TEST], RF IN/OUT [SELECT] BNC output, [RF Gen], [LEVEL] 0 dBm, [ FREQ] 0.4 MHz. Use the Spectrum analyzer to check that any spurious signals are < −40 dBc. Repeat for UUT carrier frequencies of 500 MHz and 1000 MHz.
Page 182 ACCEPTANCE TESTING Signal generator VOLTMETER RF OUTPUT INPUT TERMINALS EXT LO INPUT Modulation meter OUTPUT OUTPUT RF INPUT C6045 Fig. 5-7 Residual FM checks (12) Refer to Results table 5-9 on page 5-39. Set the UUT to [Rx TEST], RF IN/OUT [SELECT] BNC output, [RF Gen], [LEVEL] 0 dBm, [ FREQ], 1000 MHz, [Mod Gen], [Gen1/Gen2], to select modulation generator 2, and then [LEVEL], 1 kHz.
Page 183: Amplitude Modulation
ACCEPTANCE TESTING Amplitude modulation Specification Carrier range: 400 kHz to 1.05 GHz Resolution: Accuracy (up to 85% AM) ±7% of setting ± 1 digit for modulation frequency 1 kHz. Carrier frequency 1.5 to ±10% of setting ± 1 digit for modulation frequencies of 50 Hz to 5 kHz. 400 MHz.
Page 184 ACCEPTANCE TESTING Check that the Modulation meter reads within ±7% of setting ± 1 digit. Repeat for UUT AM depths of 10, 20, 30, 40, 50, 60, 70, and 85%. Refer to Results table 5-13 on page 5-41. On the UUT, press [FREQ] 65 Hz to set Mod Gen 2 to 65 Hz.
Page 185: Frequency Modulation
ACCEPTANCE TESTING Frequency modulation Specification Carrier range 400 kHz to 1.05 GHz Accuracy † ±5% ± 10 Hz at 1 kHz modulating frequency. ± 10% for modulating frequencies from 50 Hz to 15 kHz. Less than 1% at 1 kHz for deviation of 5 kHz, CCITT Weighted. Distortion †...
Page 186 ACCEPTANCE TESTING (11) Refer to Results table 5-18 on page 5-42. Set the UUT Mod Gen 2 to provide 10 kHz deviation level at a frequency of 50 Hz. (12) Select the 30 Hz to 50 kHz filter on the Modulation meter. (13) Check that the Modulation meter reads 10 kHz deviation ±10% ±10 Hz.
Page 187: Af Output Tests
ACCEPTANCE TESTING AF output tests Audio generator output level Specification Level range: 0.1 mV to 4 V RMS Accuracy: ±5% ±1 resolution 50 Hz to 15 kHz Test equipment Description Minimum specification Example 1 % accuracy 50 Hz to 15 kHz Solatron 7150+ AF GEN VOLTMETER...
Page 188: Audio Generator Distortion
ACCEPTANCE TESTING Audio generator distortion Specification Distortion: Less than 0.5% at 1 kHz. Less than 1% from 50 Hz to 15 kHz . Test equipment Description Minimum specification Example Distortion Capable of measuring distortion from 1 kHz to IFR 2965 or analyzer 15 kHz down to 0.1%.
Page 189: Audio Generator Frequency
ACCEPTANCE TESTING Audio generator frequency This is a functional check only. The Audio generator frequency is derived digitally and provided that the hardware is operational its accuracy will be maintained. The instrument’s internal reference frequency is checked elsewhere. This check is listed at this point as it is one of the AF generator tests, but it should be carried out after the UUT audio frequency meter has been checked (see AF input tests;...
Page 190: Af Input Tests
ACCEPTANCE TESTING AF input tests Audio frequency meter This test confirms the accuracy of the audio counter hardware. Overall accuracy is governed by the instrument reference frequency. The reference is checked independently elsewhere. Note: If the LF generator is not available then the Audio generator frequency check will confirm that the audio frequency meter is functional.
Page 191: Audio Voltmeter
ACCEPTANCE TESTING Audio voltmeter Specification Level accuracy: ±3% ±3 mV ± resolution 20 Hz to 50 kHz (DC and 20 Hz to 50 kHz when DC coupled) Resolution: 1 mV or 1% of reading. Test equipment Description Minimum specification Example LF generator 50 Hz to 50 kHz 30 mV to 5 V RMS.
Page 192 ACCEPTANCE TESTING LF generator AF INPUT AF GEN OUTPUT VOLTMETER INPUT TERMINALS C6040 Fig. 5-13 Audio voltmeter level accuracy checks Set the UUT AF filter to 50 kHz LP. Set the LF generator to frequency 50 Hz level 1 V RMS (adjust until DVM indicates as close to 1 V as possible).
Page 193: Audio Oscilloscope
ACCEPTANCE TESTING Audio oscilloscope Specification Voltage accuracy: ±5% of full scale DC to 50 kHz (3 Hz to 50 kHz AC coupled). Ranges: 10 mV/div to 20 V/div in a 1, 2, 5 sequence. Graticule: 10 horizontal by 6 vertical. Test equipment Description Minimum specification...
Page 194: Af Distortion & Sinad Meter
ACCEPTANCE TESTING (7) Connect the DC supply in place of the LF generator and adjust its level until the oscilloscope trace sits on the graticule line two divisions down from the top of the display. Check that the DVM indicates a level within the limits shown in the above table. (8) Temporarily remove the DC PSU, set the UUT oscilloscope to 10 V/div and use the front panel SCOPE position control to set the trace onto the bottom graticule line.
Page 195: Rf Input Tests
ACCEPTANCE TESTING RF input tests Modulation analyzer - FM Specification 100 kHz to 1.05 GHz. Frequency range: Modulation frequency range: 10 Hz to 15 kHz. Deviation range: 0 to 75 kHz. 10 Hz below 2 kHz deviation Resolution: 1% above 2 kHz deviation Accuracy (see Note 1) ±5% ±...
Page 196 ACCEPTANCE TESTING Signal generator RF OUTPUT Modulation meter ANTENNA RF INPUT INPUT Splitter C6051 Fig. 5-15 Modulation meter FM Refer to Results table 5-30 on page 5-47. Connect the equipment as shown in Fig. 5-15, connecting the incoming signal to the antenna input socket of the UUT. Set the Modulation meter to monitor FM in a 50 Hz to 15 kHz bandwidth, noise averaging Set the UUT to [Tx TEST], RF IN/OUT [SELECT] antenna BNC input socket.
Page 197 ACCEPTANCE TESTING (14) Set the RF signal generator modulation rate to 10 kHz and the UUT AF Filter to 50 kHz LP. Check that the deviation level indicated on the UUT is within ± 7.5% ± UUT resolution of the deviation indicated on the Modulation meter. (15) Refer to Results table 5-32 on page 5-47.
Page 198: Modulation Analyzer - Am
ACCEPTANCE TESTING Modulation analyzer - AM Specification 100 kHz to 1.05 GHz. Frequency range: 10 Hz to 15 kHz. Modulation frequency range: AM depth range: 0 to 99% (manually tuned) 0 to 90% below 100 MHz 0 to 80% from 100 to 400 MHz Resolution: 1% AM Accuracy...
Page 199 ACCEPTANCE TESTING Refer to Results table 5-36 on page 5-48. Connect the equipment as shown in Fig. 5-16, connecting the incoming signal to the antenna input socket of the UUT. Set the Modulation meter to monitor AM in a 50 Hz to 15 kHz bandwidth, Noise averaging on.
Page 200: Rf Frequency Meter
ACCEPTANCE TESTING RF frequency meter Specification Frequency range: 100 kHz to 1.05 GHz 0.1 Hz, 1 Hz or 10 Hz selectable Resolution: Accuracy As frequency standard ± resolution Sensitivity autotuned 5 mW (N-type), 0.05 mW (antenna port) Sensitivity manual tuned −34 dBm (N-type), −60 dBm (antenna port) Test equipment Description...
Page 201 ACCEPTANCE TESTING Refer to Results table 5-43 on page 5-50. Set the RF signal generator to provide a frequency of 1000 MHz at a level of 0 dBm. (10) Check that the UUT indicates a frequency between 999.999500 MHz and 1000.000500 MHz.
Page 202: Rf Spectrum Analyzer
ACCEPTANCE TESTING RF spectrum analyzer Specification Frequency range: 100 kHz to 1.0 GHz. 300 Hz, 3, 30, 300 kHz, 3 MHz. Resolution bandwidth 80 dB. Display dynamic range: Noise floor Typically 75 dB below top of screen On screen linearity: Typically ±...
Page 203 ACCEPTANCE TESTING Reduce the RF signal generator RF level until the trace sits on the graticule line 2 divisions down from the top line. Check that the level set on the RF signal generator is 20 dB down from reading 1 ±3 dB (functional test only). Reduce the RF signal generator RF level until the trace sits on the graticule line 3 divisions down from the top line.
Page 204: Rf Broad Band Power Meter
ACCEPTANCE TESTING RF broad band power meter Specification Frequency range: 200 kHz to 1.05 GHz. Accuracy: ± 10% ± resolution. 0.1 dB Resolution: Test equipment Description Minimum specification Example Calibrated RF Accuracy better than 2.1%.. See below. power source consisting of:- RF signal 11 MHz to 1 GHz frequency range, RF level IFR 2041...
Page 205 ACCEPTANCE TESTING Set the calibrated power source to provide 100 MHz and 100 mW. Press [SELECT] on the UUT to select N-type input/output, i.e. both LEDs above the N-type socket on. Note the level on the UUT broad band power meter and check that it is within the stated specification. Set the calibrated power source to provide 5 mW(+7 dBm).
Page 206: Acceptance Test Results Tables
ACCEPTANCE TESTING Acceptance Test Results Tables For 2944B, serial number _ _ _ _ _ _ / _ _ _ Results table 5-1 Carrier frequency accuracy Frequency Lower Upper Result limit limit 400.000 kHz 399.999 400.001 _______ 1050.00000 MHz 1049.999999 1050.000001...
Page 207 ACCEPTANCE TESTING Results table 5-3 ALC linearity at 10 MHz Level Lower Upper Result (dBm) limit limit _______ −21 −23.0 −19.0 _______ −22 −24.0 −20.0 _______ −23 −25.0 −21.0 _______ −24 −26.0 −22.0 −25 −27.0 −23.0 _______ −26 −28.0 −24.0 _______ −27 −29.0...
Page 208 ACCEPTANCE TESTING Results table 5-4 ALC linearity at 500 MHz Level Lower Upper Result (dBm) limit limit −21 −23.0 −19.0 _______ −22 −24.0 −20.0 _______ −23 −25.0 −21.0 _______ −24 −26.0 −22.0 _______ −25 −27.0 −23.0 _______ −26 −28.0 −24.0 _______ _______ −27...
Page 209 ACCEPTANCE TESTING Results table 5-6 Carrier harmonic test points at 0 dBm Frequency Second Result Third Result Upper (MHz) harmonic harmonic limit (MHz) (MHz) (dBc) _______ _______ −20 100.0 200.0 _______ 300.0 _______ −20 300.0 600.0 _______ 900.0 _______ −20 500.0 1000.0 _______...
Page 210 ACCEPTANCE TESTING Results table 5-10 AM versus carrier frequency (50% depth at 1 kHz rate) Carrier Lower Upper Result (%) frequency (MHz) limit (%) limit (%) 45.5 54.5 _______ 45.5 54.5 _______ 45.5 54.5 _______ 45.5 54.5 _______ 45.5 54.5 _______ 45.5 54.5...
Page 211 ACCEPTANCE TESTING Results table 5-12 AM linearity (100 MHz, 0 dBm at 1 kHz rate) Am depth Lower Upper Result (%) set (%) limit (%) limit (%) 3.65 6.35 _______ 11.7 _______ 17.6 22.4 _______ 26.9 33.1 _______ 36.2 43.8 _______ 45.5 54.5...
Page 212 ACCEPTANCE TESTING Results table 5-15 FM versus carrier frequency (at 10 kHz deviation 1 kHz rate) Carrier Lower Upper Result frequency (MHz) limit (kHz) limit (kHz) 9.490 10.510 _______ 10.510 _______ 9.490 10.510 _______ 9.490 10.510 _______ 9.490 10.510 _______ 9.490 10.510 _______...
Page 213 ACCEPTANCE TESTING Results table 5-19 Audio generator 1 output level AF generator 1 Level Lower Upper Result frequency (Hz) (mV) limit (mV) limit (mV) 1000 4000 3799 4201 _______ 4000 3799 4201 _______ 4000 3799 4201 _______ 4000 3799 4201 _______ 2000 4000...
Page 214 ACCEPTANCE TESTING Results table 5-21 Audio generator 1 distortion AF generator 1 Level Distortion Result frequency (Hz) (mV) upper limit (%) 1000 4000 _______ 1000 100.0 _______ 2000 4000 _______ 5000 4000 _______ 15000 4000 _______ Results table 5-22 Audio generator 2 distortion AF generator 2 Level Distortion...
Page 215 ACCEPTANCE TESTING Results table 5-24 Audio generator 2 frequency (functional) AF generator 2 Lower Upper Result setting limit limit 10 Hz 9.9 Hz 10.1 Hz _______ 500 Hz 499.9 Hz 500.1 Hz _______ 1.0000 kHz 999.9 Hz 1000.1 Hz _______ 1.1111 kHz 1.1110 kHz 1.1112 kHz...
Page 216 ACCEPTANCE TESTING Results table 5-26 Audio voltmeter accuracy Frequency Result reading coupling lower limit upper limit (mV) (mV) ‡ (mV) † 1 kHz 25.1 34.9 _______ 1 kHz _______ 1 kHz _______ 1 kHz _______ 1 kHz 2000 1917 2083 _______ 1 kHz 4500...
Page 217 ACCEPTANCE TESTING Results table 5-28 Oscilloscope LF generator Result frequency timebase lower limit upper limit 10 Hz 50 ms/div 2.015 V 2.227 V _______ 50 µs/div 10 kHz 2.015 V 2.227 V _______ 50 µs/div 20 kHz 2.015 V 2.227 V _______ Results table 5-29 Distortion &...
Page 218 ACCEPTANCE TESTING Results table 5-33 FM demodulation oscilloscope Carrier Deviation Lower Upper Result frequency (kHz) limit (kHz) limit (kHz) (MHz) _______ 67.5 82.5 Results table 5-34 FM demodulation output socket Carrier Deviation Lower Upper Result frequency (kHz) limit limit (MHz) _______ 4.77 V 5.83 V...
Page 219 ACCEPTANCE TESTING Results table 5-38 AM measurement versus AM depth (1 kHz rate) Depth (%) Lower Upper Result limit (%) † limit (%) † 3.75 6.25 _______ _______ 46.5 53.5 _______ _______ _______ Results table 5-39 AM demodulation oscilloscope Carrier Depth (%) Lower Upper...
Page 220 ACCEPTANCE TESTING Results table 5-42 RF frequency meter (at −13 dBm (0.05 mW) antenna input autotuned) Carrier Lower Upper Result frequency (MHz) limit (MHz) limit (MHz) 1000 999.999999 1000.000001 _______ 499.999999 500.000001 _______ 9.999999 10.000001 _______ Results table 5-43 Internal frequency standard Carrier Lower Upper...
Page 221 ACCEPTANCE TESTING Results table 5-45 RF broad band power meter (N-type input) Frequency (MHz) Input Lower Upper Result level (dBm) limit (dBm) limit (dBm) N-input 19.4 20.5 _______ 19.4 20.5 _______ 19.4 20.5 _______ 19.4 20.5 _______ 19.4 20.5 _______ 19.4 20.5 _______...
Page 222: Index
Index Display ..............4-3 Display hold ............3-7 Display screen ............3-4 AC power supply input......... 3-8 Distortion measurement, transmitter audio ..3-29 AC supply............. 4-2 Distortion/SINAD filter........4-13 Acceptance test results tables ......5-36 DUPLEX ............3-22 Acceptance testing..........5-1 Duplex testing ..........1-5, 3-53 Acceptance tests ...........
Page 223 Keys, increment adjustment ......... 3-6 Receiver test measurements ....... 3-47 keys, orange............3-5 Receiver testing ...........1-4, 3-38 Keys, orange ............3-5 Reference level, spectrum analyzer...... 3-6 Keys, oscilloscope sweep mode ......3-7 Remote control connections ......... 2-9 Keys, soft.............. 3-5 Results tables acceptance tests ......
Page 224 Visual inspection, new instruments...... 2-2 Ventilation ............2-2 Ventilation fan and filter ........2-13 Warning, audible and visual....... 3-32 Index-3...
Page 225 5.3 If during the appropriate Warranty Period the Licensed Software does not conform substantially to the Software Product Descriptions, Data Sheets or Product Specifications Aeroflex will provide: 5.3.1 In the case of Embedded Software and at Aeroflex’s discretion either a fix for the problem or an effective and efficient work- around.
Page 226 Licensed Software at the commencement of this Agreement. 8.3 Aeroflex shall not be liable to the Licensee for any loss of use or for loss of profits or of contracts arising directly or indirectly out of any such infringement of patent, registered design, trademark or copyright.
Page 227 As we are always seeking to improve our products, the information in this document gives only a general indication of the product capacity, performance and suitability, none of which shall form part of any contract. We reserve the right to make design changes without notice. web www.aeroflex.com Email info-test@aeroflex.com November 2005...

Aeroflex 2944B Operating Manual

Table of Contents

Chapter 1 General Information

Chapter 2 Installation

Chapter 3 Local Operation

Chapter 4 Technical Description

Chapter 5 Acceptance Testing

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Table of Contents