Marconi 2030 Generator
Fabrikant:
Model:
2030
Datum:
1994
Categorie:
Groep:
Omschrijving:
10 kHz to 1.35 GHz Signal Generator
Informatie
The 2030 series Signal Generators cover the frequency ranges 10 kHz to 5.4 GHz with three models: 2030 (10 kHz to 1.35 GHz), 2031 (10 kHz to 2.7 GHz) and 2032 (10 kHz to 5.4 GHz). A dot matrix display with soft key selected screen options allow flexibility of operation and ease of use. The output may be amplitude, phase, or frequency modulated with pulse modulation available as an option. Modulation is available using a combination of up to two external signal inputs and a built-in LF source (a second internal source is optional). Microprocessor control ensures that the instruments are flexible and easy to use and allows programming by the General Purpose Interface Bus (GPIB). The GPIB is designed to IEEE Standard 488.2 and is a means of sending commands to an instrument, via a data bus, from a remote controller or personal computer. The instruments can therefore be used 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 soft keys or the rotary knob. Hard keys have single or dual functions which remain constant throughout, whereas soft keys have functions dependent on the present mode of operation. Parameters may be set to specific values by numeric key entry, while values may be varied in steps of any size using the if/ΊΙ keys or altered by moving the knob, set to a particular sensitivity. The SIG GEN, LF, SWEEP, MEM (memory), A (delta) and UTIL (utility) menus are selectable, at any point of operation, via the keys below the display panel. Within the display, the soft key functions are indicated by labels which appear alongside the keys situated at either side of the display panel. Display The display is a dot matrix liquid crystal panel, with backlighting. Carrier frequency, modulation and RF level are shown in horizontal regions on the principal screen. The display features 11 -digit resolution for carrier frequency, 4-digit for RF level and 3-digit for modulation, with unit annunciators. Contrast may be varied, using the control knob, to optimize the viewing angle. Differing lighting conditions may be accommodated using the backlight intensity function, variable from no backlight to full intensity. A full graphical display test is available, refer to the Service Manual. Frequency selection Carrier frequency is selected via the soft key option on the SIG GEN display and direct entry via the keyboard. Alternatively, selection may be made via the General Purpose Interface Bus (GPIB). Frequency resolution is 0.1 Hz across the band. Carrier frequencies can be stored in a non-volatile memory with complete recall when required. An ON-OFF key is provided to completely disable the output. Output RF output up to +13 dBm can be set by direct keyboard entry with a resolution of 0.1 dB or better over the entire range. A high output option is available to extend the maximum calibrated level to +19 dBm on the 2030 instrument. An extended hysteresis facility allows for extended electronic control of RF output level without introducing mechanical attenuator transients when testing squelch systems. A low intermodulation mode can be selected which disables the RF levelling system and improves the intermodulation performance when combining the outputs of two signal generators. A choice of calibration units is available to the operator and provision is made for the simple conversion of units (for example, dBm to μν). Calibration data for the output level is held in memory and may be altered from the front panel or over the Interface bus. The output level can be offset by up to ±2 dB by keyboard entry. Offsets from the calibrated value may be used to compensate for cable or switching losses external to the generator. This facility can be used as a means of deliberately offsetting the output level to ensure that all generators in an area give identical measurements. While using the offsetting facility, the principal calibration of the Generator is not lost and may be returned to at any time. An electronic trip protects the Generator output against reverse power of up to 50 W, preventing damage to output circuits when RF or DC power is accidently applied. Modulation Comprehensive amplitude, frequency (plus wide bandwidth FM), phase and optional pulse modulation are provided for testing a wide range of receivers. An internal modulation Oscillator is provided, having a frequency range of 0.1 Hz to 500 kHz, with a resolution of 0.1 Hz. A second modulation Oscillator can be included as an option. Two independent BNC inputs on the front panel allow external modulation signals to be mixed with the internal signal(s). Therefore, a maximum of four modulation sources may be available at one time. These sources may be combined to give the single, dual, composite and dual composite modes. The signalling facility allows testing of radio equipment with sequential and sub-audible tone capability. The sequential calling tone system is accessible from the utility menu for all four modulation modes. Sub-audible calling tones are specified within the modulation source select display. Incrementing All major parameters can be incremented or decremented in step sizes entered via keyboard entry or the GPIB. If no step size is entered for a parameter, the steps are preset to 1 kHz for carrier frequency, 1 kHz for modulation Oscillator and LF frequency, 1 kHz for FM deviation, 1% for AM depth and 1 dB for output level. In addition the rotary control can be used to vary the parameter with the sensitivity of the knob being changed by means of the xlO and +10 keys. Sweep The sweep capability of the 2030 Series allows comprehensive testing of systems. Four parameters are used to specify sweep; start, stop, number of steps and time per step. These are specified by the user, with upper and lower limits for the parameter values being dependent on the function. The sweep markers menu is available by soft key selection on the sweep display, allowing the placement of up to five user defined markers. Non-volatile memory The non-volatile memory allows 50 complete instrument settings, 50 partial settings, 100 carrier frequency settings, 20 sweep settings and 20 signalling tone sequences to be stored for later use at any time. 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 a talker and a listener. Software protection To prevent accidental interference with the contents of internal memories, internal data is protected by a secure key sequence. Two levels of protection are offered, appropriate to the function being accessed. The most secure is reserved for features which alter the calibration data of the instrument. Spectral purity With an SSB phase noise performance at of typically -122 dB c/Hz at 470 MHz (20 kHz offset), the 2030 Series can be used for both in-channel and adjacent channel receiver measurements. Harmonically related signals and non-harmonics are better than -30 dBc and - 70 dBc respectively. Calibration The 2030 Series has a recommended two year calibration interval and is calibrated entirely by electronically controlled adjustment. There are no internal mechanically adjustable components to affect the calibration. The calibration display is available via soft key selection at the utilities menu. Date stamping After readjustment the instrument updates the calibration data and records the date of adjustment. The calibration due date can be set and when this date is reached a message advises the operator to return the unit for calibration.

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Gebruikershandleiding
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Gebruikershandleiding
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286
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10.30 Mbytes (10799028 Bytes)
Taal:
english
Herziening:
23
Handleidingen-ID:
46881-978P
Datum:
02 september 1994
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Informatie
Includes information on: Option 001 - Second modulation Oscillator Option 002 - Pulse modulation Option 003 - High output power Option 005 - GMSK Bt 0.3 Option 006 - Avionics Option 008 - RF profiles and complex sweep Option 100- Single fuse version Option 105 - Modified pulse modulator Preface ... iii Operating precautions ... iv Chapter 1 GENERAL INFORMATION ... 1-1 Chapter 2 INSTALLATION ... 1-1 Chapter 3-1 OPERATION ... 3-1-1 Chapter 3-2 GPIB OPERATION ... 3-2-1 Chapter 4-1 BRIEF TECHNICAL DESCRIPTION ... 4-1-1 Chapter 5-1 ACCEPTANCE TESTING ... 5-1-1 App. 5-1-A ACCEPTANCE TESTING SECOND MODULATION Oscillator OPTION ... 5-1-A-l App. 5-1-B ACCEPTANCE TESTING PULSE MODULATION OPTION ... 5-1-B-l App. 5-1-C ACCEPTANCE TESTING HIGH OUTPUT POWER OPTION ... 5-1-C-l Annex A OPTION 005 GMSK Bt &3 ... Annex A-l Annex B OPTION 006 AVIONICS ... Annex B-l Annex D OPTION 008 RF PROFILES AND COMPLEX SWEEP ... Annex D-l Index ... Index 1

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