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3

Signal Generator

Analog Modulation
Operation

The chapter introduces the analog modulation
operation of the signal generator in detail.

The contents of the chapter are as follows:



Configure analog modulation



Configure AM (Amplitude Modulation)



Configure FM (Frequency Modulation)



Configure PM (Phase Modulation)



Configure pulse modulation



Configure LF (Low Frequency) output

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Summary of Contents for Gratten GA1483

Page 1: ......

Page 2: ...e company All rights reserved Under the international copyright ordinance any entity and individual cannot copy or spread the content of this manual including electronic manuals as well as translat e...

Page 3: ...ration before completely understanding or satisfying the conditions pointed by the warning identifier CAUTION It represents that dangers may occur It notices the user to pay attention to certain opera...

Page 4: ...irtual terminal can be used for display control and remote network access The signal generator can be widely applied to various fields such as science of education enterprise research and development...

Page 5: ...l 11 1 5 Keys and menu operation 13 1 6 Parameter input 16 1 7 On line help system 18 2 Basic Operation 19 2 1 Use table editor 19 2 2 Configure RF output 23 3 Analog Modulation Operation 33 3 1 Confi...

Page 6: ...nu Mapping Image 47 5 1 AM 47 5 2 AMPT 48 5 3 FM 49 5 4 FREQ 50 5 5 LF 50 5 6 PULSE 51 5 7 RECALL 51 5 8 SAVE 52 5 9 SWEEP 53 5 10 SYSTEM 54 6 Performance Index 55 7 Appendix 59 Appendix A accessories...

Page 7: ...ation method of radio frequency signals of the signal generator 3 Analog Modulation Operation The chapter introduces the analog modulation function and application method of the signal generator by ex...

Page 8: ...s and general technical specifications of the signal generator 7 Appendix The chapter provides accessory details of the signal generator Related user s documents of the product The user s documents of...

Page 9: ...rear panels the user interface and first use announcements of the signal generator The contents of the chapter are as follows Preparation before use Characteristics of the front panel Characteristics...

Page 10: ...le of the product is reliably connected with the protective ground wire before connecting any input or output terminal of the product Check the rated values of all terminals In order to prevent a fire...

Page 11: ...check the vents and fans Please do not operate in wet environment In order to prevent short circuit of the internal circuit of the instrument or danger of electric shock please do not operate the ins...

Page 12: ...following steps 1 Check whether there is damage caused by transportation Please keep the damaged freight packages or vibration proof materials until the goods are completely checked and the instrumen...

Page 13: ...chapter of Characteristics of back panel Caution In order to avoid electric shock please make sure that the instrument is grounded rightly 1 1 4 Booting check Turn on the main switch on the back pane...

Page 14: ...requency and amplitude settings and error information The detailed information of the interface is introduced in the next section 2 Soft function key The soft function key triggers the function indica...

Page 15: ...tch key Audio LF signal output on off control key 9 Audio LF output interface The BNC joint is an audio signal output interface 10 Modulation MOD main switch key Control the modulation main switch The...

Page 16: ...l one decimal point key one symbol key and four unit keys The symbol keys are numerical value symbol and delete reuse key 17 Return key Return to the menu by using the hard function key 18 Power stand...

Page 17: ...layed in this part of the display screen When the frequency reference is run by using frequency offset or frequency multiplication the value will be also displayed in the display region in this area 2...

Page 18: ...egion defines the function of the soft function key close to the right of the label and the soft function key label could be changed according to the selected function 6 Message display region The reg...

Page 19: ...t the RF carrier wave is modulated MOD ON or the modulation is stopped MOD OFF One status of the identifier will be displayed on the display screen all the time PM ON OFF PM ON is displayed only when...

Page 20: ...wire box Connectable AC power source type AC 100 V 240 V 47 Hz 420 Hz Specification of the fuse wire 5 20mm rated value 1A 250V 2 10MHz OUT Reference clock output is implemented by connection of a BN...

Page 21: ...rface The signal generator can be connected with an external USB device as Driven Device 11 LAN connector The signal generator supports communication based on LAN by an LAN Local Area Network connecto...

Page 22: ...e soft function keys list the functions that are lastly accessed via the keys on the front panel which also depend on the currently selected menu If the function value of the soft function key can be...

Page 23: ...nction switch parameter input Select the corresponding menu item to switch sub options of the menu item Change the parameter value by inputting digit via the keyboard after switching to a specific sub...

Page 24: ...ch as AM which represents an amplitude modulation function key Soft function key Format menu character character background corresponding to the menu soft keys such as AM Depth which represents a modu...

Page 25: ...as follows Numeric keys 1 The numeric keys 0 9 are used for directly inputting digits Decimal point key 2 It is used for inputting a decimal point Symbolic key 3 The symbolic key is a numerical value...

Page 26: ...are used for progressively increasing or decreasing the parameters according to certain stepping when inputting the parameters 7 The up arrow represents progressive increment and the down arrow repres...

Page 27: ...n the center of the screen 2 Close the help system Press the Help key again to close the help system at the condition that the help system is already open 3 Get help Press any hard function key or sof...

Page 28: ...Generator Basic Operation The chapter introduces the basic operation of the signal generator in detail The contents of the chapter are as follows Use table editor Configure RF output Configure remote...

Page 29: ...introduces the basic function of the table editor by taking a list mode value table editor as an example The operation steps are as follows 1 Press the PRESET key to make sure that the system is rest...

Page 30: ...table item so as to conveniently perform selection and editor operation Interface Menu Menu system used for selecting table items presetting tabular value and changing the table structure Table items...

Page 31: ...s used for inserting a same table item row above the current selected row Delete Row It is used for deleting the current selected row Goto Row It is used for opening the soft function key menu used fo...

Page 32: ...The existing table items can be modified by performing the following detailed steps 1 Use the arrow keys or knobs to move the cursor to the needed items As shown in figure 4 the first item in the Fre...

Page 33: ...tor leaves factory 2 Observe the FREQUENCY region it is in the left upper corner of the display screen in the display screen The value displayed is the specified highest frequency of the signal genera...

Page 34: ...adjust the frequency back to 700MHz 2 2 1 2 Set reference frequency and frequency offset By the following procedure the RF output frequency is set as reference frequency All the other frequency parame...

Page 35: ...by the hard function key to subtract the reference frequency 700MHz and at the moment the frequency of the RF OUTPUT is changed into 701MHz 6 Pres the Freq Offset soft function key and input 1MHz It...

Page 36: ...y screen will be 0dB namely the value formed by using the power output by the hard function key to subtract the reference power Although the display content will be changed the output power will not b...

Page 37: ...activated status and the power of the RF OUTPUT connector is still 1dBm 2 2 2 Configure sweep RF output The signal generator includes two sweep types step sweep and list sweep This section explains t...

Page 38: ...range is from 500MHz to 600MHz Amplitude range is from 20dBm to 0dBm Dwell time of each point is 500ms Detailed operation steps are as follows 1 Press PRESET 2 Press SWEEP It will open a sweep soft fu...

Page 39: ...function key can be selected to return to the last menu and run the sweep function 13 Press RF On Off The status of the indicator on the display screen will be changed from RF OFF into RF ON 14 Press...

Page 40: ...e process the step sweep points are utilized and the sweep information is changed by editing a plurality of points in the List Mode Values table editor The detailed content related to use of the table...

Page 41: ...in the table namely the frequency value of point 2 at this condition becomes a highlighted item after you press the end mark soft function key 6 Use the arrow keys to highlighted the frequency value...

Page 42: ...90 MHz 11 Press the Insert Item soft function key and input 2 5 dBm It will insert a new power value at point 8 and move the original power values of point 8 and point 9 to the next row 12 Highlight t...

Page 43: ...dulation operation of the signal generator in detail The contents of the chapter are as follows Configure analog modulation Configure AM Amplitude Modulation Configure FM Frequency Modulation Configur...

Page 44: ...Table 8 Analogue modulation waveform Waveform Description Sine wave It has adjustable amplitude and frequency Dual sine wave It has respectively adjustable frequency and peak value amplitude percenta...

Page 45: ...340kHz At the moment the FREQUENCY Frequency region of the display screen will display 1 340 000 0MHz 3 2 2 Set RF output amplitude Press the AMPT hard function key and input 0dBm At the moment the AM...

Page 46: ...lue of the AM waveform soft function key The amplitude modulation signal is output according to the following steps 1 Press the MOD Off On key At the moment the MOD ON indicator is activated to show t...

Page 47: ...wave frequency 1 Press PRESET 2 Press the FREQ hard function key and input 1 GHz At the moment the FREQUENCY Frequency region of the display screen will display 1 000 000 0GHz 3 3 2 Set RF output ampl...

Page 48: ...wave is a sine wave in waveform 3 3 4 Run frequency modulation Output the frequency modulation signal according to the following steps 1 Press the MOD OFF ON key At the moment the MOD ON indicator is...

Page 49: ...FREQ hard function key and input 3 GHz At the moment the FREQUENCY region of the display screen will display 3 000 000 0GHz 3 4 2 Set RF output amplitude Press the AMPT hard function key and input 0d...

Page 50: ...the modulation rate is 10 kHz and the carrier wave is a sine wave in waveform 3 4 4 Run phase modulation 1 Press MOD Off On MOD display indicator will be opened to point out that you have already run...

Page 51: ...et carrier wave frequency 1 Press the PRESET 2 Press the FREQ hard function key and input 2 GHz At the moment the FREQUENCY Frequency region of the display screen will display 2 000 000 0GHz 3 5 2 Set...

Page 52: ...t value of the modulation source Pulse Source soft function key 3 5 4 Activate pulse modulation 1 Press the Mod Off On key At the moment the MOD ON indicator is activated to show that modulation on of...

Page 53: ...nction key and input 1kHz Thus the LF output frequency is set as 1kHz 1 000kHz will appear below the LF Output Freq soft function key 4 Press the LF Out Amplitude soft function key and input 1Vp Thus...

Page 54: ...URN Thus return to the low frequency output menu The waveform will be displayed below the LF Output Waveform soft function key 3 6 3 Run LF Output 1 Press the MOD Off ON key At the moment the MOD ON i...

Page 55: ...4 Signal Generator Remote Control The chapter introduces the method for remotely controlling the signal generator...

Page 56: ...ing control on the instrument PC software The user can write computer software independently and send a command to remotely control the signal generator Besides the user also can use Measurement Autom...

Page 57: ......

Page 58: ...5 Signal Generator Menu Mapping The chapter introduces menu mapping corresponding to each function key on the front panel of the signal generator according to the alphabetical order...

Page 59: ...provides the function mapping image related to the menu keys on the front panel of the signal generator according to an alphabetical order A Z and specifically the meaning of each menu refers to the o...

Page 60: ...48 5 2 AMPT...

Page 61: ...49 49 Signal Generator 5 3 FM...

Page 62: ...50 5 4 FREQ 5 5 LF OUT...

Page 63: ...51 51 Signal Generator 5 6 PULSE 5 7 RECALL...

Page 64: ...52 5 8 SAVE...

Page 65: ...53 53 Signal Generator 5 9 SWEEP...

Page 66: ...54 5 10 SYSTEM...

Page 67: ...6 Signal Generator Performance Index The chapter lists the technical indexes and general technical specifications of the signal generator...

Page 68: ...requency Frequency Frequency range 250kHz 4GHz 250kHz 4GHz 250kHz 3GHz Resolution 0 1Hz Internal Reference Frequency 10MHz Temp 0 to 45 C Accuracy 0 1ppm 1ppm 0 1ppm Aging 1ppm year Output amplitude 0...

Page 69: ...harmonics 50dBc Modulation characteristics Amplitude Modulation Modulation Depth Resolution Modulation freq Accuracy Distortion 0 100 Temp 0 to 45 C 0 1 20 Hz 20 kHz set value 5 0 2 2 1kHz modulation...

Page 70: ...ulation rate 5rad offset Pulse Modulation On off ratio 80 dB 60 dB 80 dB Rise Fall time 50ns 60ns 50ns Pulse Width 400ns 1s Pulse Period 1us 2s Time resolution 100ns LF Function source Waveform Type S...

Page 71: ...58 Size 426 133 450 mm H x W x D Working temperature 0 C 40 C Storage Temperature 40 C 70 C Date Storage Internal 2M Date Storage External Support USB 2 0 Compatible memory devices...

Page 72: ...7 Signal Generator Appendix The chapter provides the relevant information of accessory details services and support of the signal generator...

Page 73: ...cessories Category Name Description Standard accessories Power cord One piece User s manual One copy Programming manual One copy Postscript to know more selectable components or accessories please con...

Page 74: ......

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