Alltest MG3681A Operation Manual

Digital modulation signal generator
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A l l t e s t I n s t r u me n t s , I n c .
5 0 0 C e n t r a l A v e .
F a r mi n g d a l e , N J 0 7 7 2 7
P : ( 7 3 2 ) 9 1 9 - 3 3 3 9
F : ( 7 3 2 ) 9 1 9 - 3 3 3 2
a l l t e s t . n e t
s s a l e s @ a l l t e s t . n e t
T h e t e s t & me a s u r e me n t
e q u i p me n t y o u n e e d a t
t h e p r i c e y o u w a n t .
A l l t e s t c a r r i e s t h e w o r l d ' s l a r g e s t s e l e c t i o n o f
u s e d / r e f u r b i s h e d b e n c h t o p t e s t & me a s u r e me n t
e q u i p me n t a t 5 0 % t h e p r i c e o f n e w .
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a v a i l a b l e w i t h c e r t i f i e d c a l i b r a t i o n f r o m o u r i n - h o u s e s t a f f
o f t e c h n i c i a n s a n d e n g i n e e r s .
• 1 0 + f u l l t i me t e c h n i c i a n s w i t h o v e r 1 5 0 y e a r s o f
s p e c i a l i z a t i o n
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• E v e r y u n i t t e s t e d t o O E M s p e c i f i c a t i o n s
• S a t i s f a c t i o n g u a r a n t e e d
Y o u h a v e p l a n s , w e w i l l h e l p y o u a c h i e v e t h e m.
A n y p r o j e c t . A n y b u d g e t .
t
G e t a q u o t e t o d a y !
C C a l l ( 7 3 2 ) 9 1 9 - 3 3 3 9 o r e ma i l s a l e s @a l l t e s t . n e t .

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Summary of Contents for Alltest MG3681A

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 MG3681A Digital Modulation Signal Generator Operation Manual 13th Edition For safety and warning information, please read this manual before attempting to use the equipment. Keep this manual with the equipment. ANRITSU CORPORATION Document No.: M-W1708AE-13.0...
  • Page 3 This indicates a warning or caution. The contents are indicated symbolically in or near the triangle. This indicates a note. The contents are described in the box. These indicate that the marked part should be recycled. MG3681A Digital Modulation Signal Generator Operation Manual 17 April...
  • Page 4 For Safety DANGER NEVER touch parts where the label shown on the left is attached. Such parts have high voltages of at least 1 kV and there is a risk of receiving a fatal electric shock. WARNING 1. ALWAYS refer to the operation manual when working near locations at which the alert mark shown on the left is attached.
  • Page 5 For Safety WARNING Electric Shock 3. To ensure that the instrument is earthed, always use the supplied 3- pin power cord, and insert the plug into an outlet with an earth terminal. If power is supplied without earthing the equipment, there is a risk of receiving a severe or fatal electric shock or causing damage to the internal components.
  • Page 6 For Safety CAUTION 1. Always remove the mains power cable from the power outlet before replacing blown fuses. There is a risk of electric shock if fuses are Fuse Replacement replaced with the power cable connected. Always use new fuses of the type and rating specified on the rear panel of the instrument.
  • Page 7 For Safety CAUTION Replacing Memory This equipment uses a Poly-carbomonofluoride lithium battery to backup Back-up Battery the memory. This battery must be replaced by service personnel when it has reached the end of its useful life; contact the Anritsu sales section or your nearest representative.
  • Page 8 Equipment Certificate Anritsu Corporation certifies that this equipment was tested before shipment using calibrated measuring instruments with direct traceability to public testing organizations recognized by national research laboratories, including the National Institute of Advanced Industrial Science and Technology, and the National Institute of Information and Communications Technology, and was found to meet the published specifications.
  • Page 9 Notes On Export Management This product and its manuals may require an Export License/Approval by the Government of the product's country of origin for re-export from your country. Before re-exporting the product or manuals, please contact us to confirm whether they are export-controlled items or not. When you dispose of export-controlled items, the products/manuals need to be broken/shredded so as not to be unlawfully used for military purpose.
  • Page 10 Crossed-out Wheeled Bin Symbol Equipment marked with the Crossed-out Wheeled Bin Symbol complies with council directive 2002/96/EC (the “WEEE Directive”) in European Union. For Products placed on the EU market after August 13, 2005, please contact your local Anritsu representative at the end of the product's useful life to arrange disposal in accordance with your initial contract and the local law.
  • Page 11 Notice The following actions are strictly prohibited for all of the software installed in this product or otherwise provided by Anritsu: 1. Copying, except for archival purposes. 2. Transferring to a third party separately from this product. 3. Analyzing the incorporated software including but not limited to modifying, decompiling, disassembling, and reverse engineering.
  • Page 12 Council Directive 93/68/EEC to indicate that they conform to the EMC and LVD directive of the European Union (EU). CE marking 1. Product Model Model: MG3681A Digital Modulation Signal Generator Plug-in Units: MU368010A TDMA Modulation Unit MU368030A Universal Modulation Unit MU368040A CDMA Modulation Unit...
  • Page 13 3. Applied Standards • EMC: Emission: EN 61326-1: 2006(Class A) Immunity: EN 61326-1: 2006(Table 2) (Annex A) Performance Criteria* IEC 61000-4-2 (ESD) IEC 61000-4-3 (EMF) IEC 61000-4-4 (Burst) IEC 61000-4-5 (Surge) IEC 61000-4-6 (CRF) IEC 61000-4-11 (V dip/short) *: Performance Criteria A: During testing, normal performance within the specification limits.
  • Page 14 EMC framework of Australia/New Zealand. C-tick marking 1. Product Model Model: MG3681A Digital Modulation Signal Generator Plug-in Units: MU368010A TDMA Modulation Unit MU368030A Universal Modulation Unit MU368040A CDMA Modulation Unit...
  • Page 15 Power Line Fuse Protection For safety, Anritsu products have either one or two fuses in the AC power lines as requested by the customer when ordering. A fuse is inserted in one of the AC power lines. Single fuse: Double fuse: A fuse is inserted in each of the AC power lines.
  • Page 16: About This Manual

    About This Manual This manual (MG3681A Digital Modulation Signal Generator Main Frame Opera- tion Manual) mainly describes operation, maintenance, and remote control of MG3681A Digital Modulation Signal Generator. Basic functions and the outline of operation are described in Section 3 “Opera- tion.”...
  • Page 17: Table Of Contents

    About This Manual ........Section 1 Outline ........Outline of the Product ........... Composition of the Product........... Section 2 For Using MG3681A Safely..Installation ..............Items to be Confirmed before Use ........ Power Connection............Section 3 Operation ........Names of Parts and Turning the Power-Supply On/Off Setting the Key Parameters ..........
  • Page 18 Section 6 Storage and Transportation..Daily Maintenance............Tips on String the Unit for an Extended Period .... Repackaging and Shipping ........... Storing Memory Cards ..........Appendix A Specifications......Appendix B Message Displays ....Appendix C Default Value List ....Appendix D Performance Test Report Form......
  • Page 20: Outline

    Section 1 Outline This section describes the outline and the composition of the product. Outline of the Product ..........Composition of the Product ........1.2.1 Standard Composition........1.2.2 Unit and Options..........1.2.3 Peripheral Equipment........
  • Page 21 Section 1 Outline...
  • Page 22: Outline Of The Product

    1.1 Outline of the Product 1.1 Outline of the Product The MG3681A is a standard digital modulation signal generator equipped with a wide-band quadrature modulator, capable of outputting complex and high-precision signals that are necessary in processes from development to mass-production of digital mobile communication equipment and of related devices.
  • Page 23: Composition Of The Product

    1.2 Composition of the Product 1.2.1 Standard Composition The table below shows the standard composition of the MG3681A. After opening the package, confirm if you have all the products described below. If anything is missing or damaged, contact our company or its agencies.
  • Page 24 1.2 Composition of the Product 1.2.2 Unit and Options Shown in the table below are the extension units of the MG3681A. They are all sold separately. Model Modulation unit Remarks MU368010A TDMA modulation unit Corresponding systems PDC, GSM, etc. MG368030A...
  • Page 25 Section 1 Outline 1.2.3 Peripheral Equipment The table below shows the peripheral equipment for the MG3681A. They are all sold separately. Model/No. Product Remarks J0576B Coaxial cord Approx. 1 m long (N-P, 5D-2W,N-P) J0576D Coaxial cord Approx. 2 m long (N-P, 5D-2W, N-P)
  • Page 26: For Using Mg3681A Safely

    Section 2 For Using MG3681A Safely This section describes items that you should know before using the MG3681A. As it also contains tips for safety and for avoiding failures during use, be sure to read it at least once. Installation..............2-3 2.1.1 Installation place..........
  • Page 27 Section2 For Using MG3681A Safely...
  • Page 28: Installation

    2.1 Installation 2.1 Installation 2.1.1 Installation place Set the MG3681A either horizontally or at an angle using a tilt stand, as shown in the figure below. When it is tilted, do not put any object on the MG3681A. Function Cursor...
  • Page 29: Items To Be Confirmed Before Use

    Section2 For Using MG3681A Safely 2.2 Items to be Confirmed before Use 2.2.1 Safety Protection Labels For safety, WARNING and CAUTION labels shown below are affixed on the back panel. Please observe the instructions on the labels. WARNIG CAUTION NO OPERATOR SERVICE- FOR CONTINUED FIRE ABLE PARTS INSIDE....
  • Page 30: Reverse-Power Protection Circuit

    The maximum value of power for which the reverse-power protection circuit of the MG3681A is effective is DC±50 VDC, 25 W(≤1 GHz), and 50 W(> 1 GHz). Function Cursor...
  • Page 31: Fuse

    Section2 For Using MG3681A Safely 2.2.3 Fuse Confirm if the T6.3A250V fuse is placed inside. When the fuse blows, first elimi- nate the cause, and then replace the fuse by the following procedure. The accesso- ries package contains two T6.3A250V fuses.
  • Page 32 2.2 Items to be Confirmed before Use CAUTION When replacing the fuse, first disconnect the power cord from the socket, and then replace the fuse. If you replace the fuse without disconnecting the power cord, you may re- ceive an electric shock. Note that the new fuse to be re- placed must have the same rate and characteristics as the T6.3A250V fuse.
  • Page 33: Power Connection

    Section2 For Using MG3681A Safely 2.3 Power Connection This section describes the procedures for supplying power. 2.3.1 Power Requirements For normal operation of the instrument, observe the power voltage range described below. Power source Voltage range Frequency 100 Vac system 100 to 120 V 47.5 to 63 Hz...
  • Page 34 2.3 Power Connection CAUTION If an emergency arises causing the instrument to fail or malfunction, disconnect the instrument from the power supply by either turning off the OI switch on the rear panel (switch to the (O) side), or by pulling out the power cord or the power inlet.
  • Page 35 Section2 For Using MG3681A Safely 2-10.
  • Page 36: Operation

    Section 3 Operation This section describes the names of the parts of the MG3681A, the method to set its basic parameters, its operation method for modulation and its convenient functions that you should know in order to actually operate the unit.
  • Page 37 Section 3 Operation APM: Save to Memory ........ 3-46 APM: Recall from Memory ......3-48 APM: Delete Memory........3-49 Setting the Modulation Function ........ 3-50 3.3.1 Analog modulation ......... 3-50 Carry Out Amplitude Modulation (AM) with an External Modulating Signal..3-51 Carry Out Frequency Modulation (FM) with an External Modulating Signal..
  • Page 38: Names Of Parts And Turning The Power-Supply On/Off

    3.1.1 Names of the Parts Names on the front panel The keys and connectors on the front panel are described here. <11> <12> <13> <8> <9> <10> Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz Preset Cancel <7> Level <14>...
  • Page 39 (Contents of the menus displayed on the screen change every time the screen is switched using a soft function key or a main function key.) <9> Main Function Keys Frequency Used to set or execute the main functions of the MG3681A. Level When is pressed, the frequency parameter setting screen appears. Frequency...
  • Page 40 3.1 Names of Parts and Turning the Power-Supply On/Off <11> Shift Key Shift When operating any key to work a function described in blue characters shown above the key, first press this key, and then, after its lamp is illuminated, press the target key.
  • Page 41 Section 3 Operation <17> RF Output Connector Outputs RF signal. 50 Ω <18> AF Output Connector Outputs AF signals. The AF synthesizer of Option 21 needs to be mounted in order to use the AF signals. 600 Ω <19> Modulation Signal Input Connectors Input Pulse FM/φ...
  • Page 42 <1> Reference Frequency Signal Output Connector 10MHz Buff Output Outputs the reference frequency signal (10 MHz) that is inside the MG3681A. Used for synchronizing the MG3681A with other equipment by referring to its reference frequency signal. <2> Reference Frequency Signal Input Connector...
  • Page 43 Auxiliary input connectors of the digital modulation unit. The connector functions vary with each system. Digital Input/Output (TTL) AUX1 (TTL) AUX2 (TTL) <5> OI Switch Main power switch of MG3681A. <6> AC Inlet Inlet for supplying power. <7> Protective Grounding Terminal A protective grounding terminal.
  • Page 44: Turning The Power-Supply On/Off

    <3> Plug in the plug-side of the power cord into the AC power outlet. <4> Switch the OI switch on the back panel to I (On). The MG3681A goes into the power stand-by state, the stby lamp of the power switch lights up and warm up begins.
  • Page 45 Section 3 Operation Initial Screen Turning on the power switch allows all the lamps to turn on, and self-checks of the instrument (Main) and Digital Modulation Units (Unit) to begin. The results of the self-checks are indicated as “Pass” (passed) or “Fail” (failed) on the Self Check screen.
  • Page 46 3.1 Names of Parts and Turning the Power-Supply On/Off After the initial screen is displayed for one second, a frequency setup screen (shown below) appears. Reverse cursor Function menu Reverse Cursor The reverse cursor appears onscreen in reverse video. The reverse cursor does not appear in a remote control state.
  • Page 47: Common Setup Operations

    Section 3 Operation 3.1.3 Common Setup Operations This section describes the basic operation common for all screens, before introducing the setting of detailed parameters. Set Parameters Directly Main function parameters, such as frequency and output level, depth of analog modulation, and certain other parameters can be directly set on the displayed screen without having to open a window.
  • Page 48 3.1 Names of Parts and Turning the Power-Supply On/Off Open a Setup Window to Set the Parameters Point the reverse cursor to the parameter enclosed in [ ] to see an additional item that requires opening another setup window to set it. To open the window, press or turn the rotary knob by one click or press either once.
  • Page 49: Setting The Key Parameters

    Section 3 Operation 3.2 Setting the Key Parameters 3.2.1 Presetting This instrument can be initialized to its default settings listed in Appendix C by Preset pressing Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz Preset key Preset Cancel...
  • Page 50: Setting The Frequency

    3.2 Setting the Key Parameters 3.2.2 Setting the frequency Press front-panel main function key to open the frequency setup screen, Frequency with the onscreen cursor appearing at any digit position in the frequency reading. The key lamp will also light up. Unless otherwise noted in this section, it is assumed that the frequency setup screen is open with being pressed.
  • Page 51: Use The Numeric Keypad To Set Frequency

    Section 3 Operation Using the Numeric Keypad to Set Frequency Follow these steps to use the numeric keypad to set frequency: Sample operation: Set a frequency of 360.3 MHz. <1> Press any key of the numeric keypad (in this example, first) to open the frequency setup window.
  • Page 52: Use The Rotary Knob To Set Frequency

    3.2 Setting the Key Parameters Use the Rotary Knob to Set Frequency Use of the rotary knob makes it possible to increment or decrement the numeric val- ue at the resolution digit position (pointed to by the reverse cursor) selected with .
  • Page 53 Section 3 Operation Using the Step Keys to Set Frequency to vary a frequency in steps of a preset frequency. To use the step keys to set a frequency, follow these steps: Frequency step default: 1 MHz Sample operation: Set a frequency of 360.3 MHz, varying it in steps of 12.5 kHz.
  • Page 54: Set A Frequency Offset

    3.2 Setting the Key Parameters Set a Frequency Offset Frequency offset setting is a feature whereby the frequency that is set from the panel or under external control is shifted by a certain offset frequency for output. This feature addresses the need to set a converted frequency as in a converter test. [Actual output frequency] = [Set and displayed frequency] −...
  • Page 55: Display A Relative Frequency

    Section 3 Operation Display a Relative Frequency Relative frequency display is a feature whereby a frequency is displayed in relation to a base frequency of 0 Hz. [Set and displayed frequency] = [Actual output frequency] − [Frequency displayed as a relative frequency] To set a relative frequency, follow these steps: Sample operation: Display an output frequency in relation to a base fre- quency of 360.3 MHz, incrementing it by 12.5 kHz.
  • Page 56: Setting Output Level

    3.2 Setting the Key Parameters 3.2.3 Setting output level Press the front-panel main function key to open the output level setup Level screen, with the onscreen cursor appearing at any digit position in the output level reading. The key lamp will also light up. Unless otherwise noted in this section, it is assumed that an output level setup screen is now open with being pressed.
  • Page 57: Turn Rf Output On/Off

    Section 3 Operation An invalid output level setting (dependent on the modulation condition; +13.01 dBm or more in CW mode) would cause “Uncal” to be displayed, making successful per- formance unpredictable. Turn RF Output On/Off RF Output RPP Reset Press on the front panel to toggle RF Output between on and off.
  • Page 58: Use The Numeric Key Pad To Set Output Level

    3.2 Setting the Key Parameters Use the Numeric Key Pad to Set Output Level To use the numeric keypad to set output levels, follow these steps: Sample operation: Set an output level of −47 dBm. <1> Press to open the output level setup window. Level <2>...
  • Page 59: Use The Rotary Knob To Change Output Level

    Section 3 Operation Use the Rotary Knob to Change Output Level Using the rotary knob, it is possible to increment or decrement the numeric value at the resolution digit position (pointed to by the reverse cursor) selected with the Re- solution key.
  • Page 60: Use The Step Keys To Change Output Level

    3.2 Setting the Key Parameters Use the Step Keys to Change Output Level to vary an output level in steps of a preset value. To use the step keys to set an output level, follow these steps: Output level step default: 1 dB Sample operation: Set an output level of −47 dBm, varying it in steps of 6 to set an output level of −47 dBm.
  • Page 61: Set An Output Level Offset

    Section 3 Operation Set an Output Level Offset Output level offset setting is a feature whereby the output level that is set from the panel or under external control is shifted by a certain offset. This feature addresses the need to correct the attenuation in a cable connected to an output.
  • Page 62: Display A Relative Level

    3.2 Setting the Key Parameters The output level may also be set using the rotary knob or step keys. The offset setting feature works only if the output level unit of dB (dBm or dBµV) is selected. Display a Relative Level Relative output level display is a feature whereby an output level is displayed in re- lation to a base output level of 0 dB.
  • Page 63: Select A Voltage Display Mode

    Section 3 Operation Select a Voltage Display Mode The voltage units (V, dBµV) are selectable from EMF (Electro Motive Fource) volt- age and terminating voltage display modes. To set either release voltage mode or terminating voltage display mode, follow these steps: Voltage display mode default: emf voltage display Sample operation: Set an output level of 30 dBµV in emf voltage display...
  • Page 64: Use Continuous Mode

    3.2 Setting the Key Parameters Use Continuous Mode This instrument uses a mechanical attenuator to vary the output level. mechanical attenuator is susceptible to momentary signal interruptions or spike noises. Choose Continuous mode when such momentary signal interruptions or spike noises pose a concern during measurement tasks. In Continuous mode, the action of the mechanical attenuator is locked, so that the output level can be continu- ously varied within a range of ±10 dB using the high-resolution setup electronic at- tenuator alone.
  • Page 65: Use Safety Mode

    Section 3 Operation Use Safety Mode When modifications are made to parameters of this instrument, a large signal larger than the output level setting may be outputted depending on the setup procedure used. Safety mode is used if it is feared that such excessive-level signal output may dam- age the device under test.
  • Page 66: Using The Alc

    3.2 Setting the Key Parameters Using the ALC (Automatic Level Control) Off Mode MG3681A normally outputs a level-stabilized signal using the ALC loop circuit. However, the ALC loop circuit does not operate normally when it performs modula- tion for a pulse that has a short RF output time and a long loop interval. Thus, MG3681A sometimes does not output a stable signal.
  • Page 67: Changing The Alc Time Constant

    Section 3 Operation Changing the ALC Time Constant In the ALC On mode, you can set a desired ALC time constant. Normally, set the ALC time constant to “Auto”. When performing external digital modulation (vector modulation), wide-band am- plitude modulation (Wide AM), or pulse modulation, change the ALC time constant as required.
  • Page 68 3.2 Setting the Key Parameters <3> Move the reverse cursor to ALC Time Constant to open the setting window. <4> Select “5 µs,” then press to accept it as the ALC time constant. 3-33...
  • Page 69: Using The Rf High Level Output Mode

    Section 3 Operation Using the RF High Level Output Mode Installing Option 42, RF High Level Output, enables the low-distortion power- amplifier for W-CDMA band to be inserted at the end of RF circuit. RF high level output Step attenuator RF output part RF output Low distortion power amp.
  • Page 70 3.2 Setting the Key Parameters <4> Select “On” and press When the RF High Level Output mode is turned on, “Hi-Lvl Mode (1900-2300M)” appears above the display of output level. It indicates that the RF High Level Output mode is being turned on with the available frequency range displayed. The performance of the RF High Level Output mode is assured only in the range of 1.9 to 2.3 GHz.
  • Page 71: Using Memory Functions

    Section 3 Operation 3.2.4 Using Memory Functions With its memory functions, this instrument enables the user to save, recall, and delete parameters, such as frequency, output level, and modulation. The following memory modes are supported: 1. Save and recall frequencies and output levels (up to 512 sets) 2.
  • Page 72: Bpm (Basic Parameter Memory)

    3.2 Setting the Key Parameters BPM (Basic Parameter Memory) BPM stores up to 512 sets of hardware settings of frequencies and output levels. It allows either frequency or output level settings or both to be recalled selectively, as well as by memory location number or by sweep. BPM: Save to Memory To save data to BPM, press front-panel main function key to enable the...
  • Page 73: Bpm: Recall From Memory

    Section 3 Operation BPM: Recall from Memory To recall stored data from BPM, press front-panel main function key Memory enable the memory facility. Then, enter a memory location number and press Recall ; or turn the rotary knob; or press the step keys. Hz/fW Sample operation: Recall the frequency and output level settings stored at memory location number 10.
  • Page 74: Bpm: Edit Memory Attributes

    3.2 Setting the Key Parameters BPM: Edit Memory Attributes The following two attributes can be set on BPM for each memory location number: 1 Recall pattern (parameters to be recalled) 2 Skip mode (disable recall with the rotary knob or step keys) These two attributes can be set in the Basic Parameter Edit screen that is invoked by the memory facility.
  • Page 75: Bpm: Select A Recall Pattern

    Section 3 Operation BPM: Select a Recall Pattern There are three different ways to recall stored data from basic parameter memory: frequencies only, recall output levels only, and recall both frequencies and output levels. Edit BPM attributes on the Basic Parameter Edit screen to select a recall pattern.
  • Page 76: Bpm: Set Skip Mode

    3.2 Setting the Key Parameters BPM: Set Skip Mode When BPM skip mode is turned on for a given memory location, that location can be skipped from the scope of recall by the rotary knob or step keys. The selected memory location can also be hidden from the scope of a sweep and also from the scope of triggering under external control.
  • Page 77: Bpm: Delete Memory

    Section 3 Operation BPM: Delete Memory To delete BPM, follow these steps: Sample operation: Delete stored data from memory location 10. <1> Press , then (Basic Parameter Edit) to open the Basic Memory Parameter Edit screen. <2> Using the cursor keys, move the reverse cursor in the memory location number field to memory location number 10, and then Memory No.
  • Page 78: Bpm: Sweeping

    3.2 Setting the Key Parameters BPM: Sweeping You can sweep frequencies and/or output levels stored in BPMs. Frequencies and/or output levels are swept between the specified start point and the specified end point in the order of memory numbers. The sweep time is the same to the sweep times specified set for each BPM.
  • Page 79 Section 3 Operation <7> Enter “10” using numeric keys, then press to determine it. <8> Move the reverse cursor to Sweep Mode. <9> Select “Auto” using the step key or rotary knob, then press to determine <10> Pressing Start) starts sweeping. 3-44...
  • Page 80: Apm (All-Parameter Memory)

    3.2 Setting the Key Parameters APM (All-Parameter Memory) With up to 100 memory locations, APM has enough capacity to store all parameters that can be set from the instrument panel (except for memory parameters and remote control parameters). These parameters include the settings of the digital modulation units.
  • Page 81: Apm: Save To Memory

    Section 3 Operation APM: Save to Memory The task of saving all parameter settings to memory can be set in the All Parameter Save screen that is invoked by the memory facility. Sample operation: Save the parameter currently on display to memory loca- tion number 10 under the title name “ABCDEF.”...
  • Page 82 3.2 Setting the Key Parameters <6> Repeat step <5> until character string “ABCDEF” is displayed in Entry, and then press The title name of memory location number 10 is set to “ABCDEF”. <7> Pressing once, The parameter is saved to memory location number 10 at the same time.
  • Page 83: Apm: Recall From Memory

    Section 3 Operation APM: Recall from Memory To recall data that has been saved to APM on the All Parameter Save screen, follow these steps: Sample operation: Recall title name “ABCDEF” of memory location number 10 at which parameters are stored. <1>...
  • Page 84: Apm: Delete Memory

    3.2 Setting the Key Parameters APM: Delete Memory To delete data that has been saved on the All Parameter Save screen, follow these steps: Sample operation: Delete stored data from memory location 10. <1> Press , then (All PRM Save) to open the Basic Parameter Edit Memory screen.
  • Page 85: Setting The Modulation Function

    Section 3 Operation 3.3 Setting the Modulation Function 3.3.1 Analog modulation Press the front-panel main function key to open the analog modulation Analog Mod setup screen, with the key lamp illuminated. Set analog modulation on this screen. Unless otherwise noted in this section,it is assumed that the analog modulation setup screen is now open with being pressed.
  • Page 86: Carry Out Amplitude Modulation (Am) With An External Modulating Signal

    3.3 Setting the Modulation Function Carry Out Amplitude Modulation (AM) with an External Modulating Signal To set amplitude modulation (AM) with external signal input, follow these steps: Connecting an external modulating signal F un ction C urso r E dit M G 3 6 8 1 A S tep S e t...
  • Page 87 Section 3 Operation <6> Using the step keys or the rotary knob, open the window and move the reverse cursor to Ext. <7> Press to accept Ext and close the window. <8> Using the cursor keys, move the reverse cursor to the AM Depth setup pa- rameter.
  • Page 88: Carry Out Frequency Modulation (Fm) With An External Modulating Signal

    Carry Out Frequency Modulation (FM) with an External Modulating Signal To set frequency modulation (FM) with external signal input, follow these steps: Connecting an external modulating signal Function Cursor Edit MG3681A Step Digital Mo dulation Frequency Signal Gene rator 250kHz -3GH z...
  • Page 89 Section 3 Operation <7> Using the step keys or the rotary knob, open the window and move the reverse cursor to Ext. <8> Press to accept Ext and close the window. <9> Using the cursor keys, move the reverse cursor to the FM Deviation setup pa- rameter.
  • Page 90: Carry Out Phase Modulation

    Carry Out Phase Modulation (φ φ φ φ M) with an External Modulating Signal To set phase modulation (φM) with external signal input, follow these steps: Connecting an external modulating signal Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz...
  • Page 91 Section 3 Operation <7> Using the step keys or the rotary knob, open the window and move the reverse cursor to Ext. <8> Press to accept Ext and close the window. <9> Using the cursor keys, move the reverse cursor to the φM Deviation setup pa- rameter.
  • Page 92: Carry Out Analog Modulation

    3.3 Setting the Modulation Function Carry Out Analog Modulation (AM, FM, φ φ φ φ M) with an Internal Modulating Signal An AF synthesizer (option 21) is a prerequisite for carrying out modulation with an internal modulating signal. Remember also to set a frequency and waveform as In- ternal AF Source setup parameters.
  • Page 93 Section 3 Operation <Waveform patterns> • Sine: Sine wave • Square: Square wave • Triangular: Triangular wave • Saw Tooth: Sawtooth wave <Path of modulation> <1> Move the reverse cursor to the path of modulation. <2> Using the rotary knob or step keys, open the window and move the reverse cur- sor in the window to “Int”.
  • Page 94: Carry Out Wide-Band Amplitude Modulation (Wide Am) With An External Modulating Signal

    Carry Out Wide-band Amplitude Modulation (Wide AM) with an External Modulating Signal To set wide-band amplitude modulation (wide AM) with external signal input, follow these steps: Connecting an external modulating signal Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz Preset Cancel...
  • Page 95: Digital Modulation

    Section 3 Operation 3.3.2 Digital modulation Press the front-panel main function key to open the digital modulation Digital Mod setup screen, with the key lamp turned on. Set digital modulation on this screen. Unless otherwise noted in this section, it is assumed that the digital modulation setup screen is now open with being pressed.
  • Page 96 3.3 Setting the Modulation Function I/Q signal outputs and digital modulation status at each setting Setting Output signal Baseband I/Q Mod. Pulse Mod. Digital I/Q Output RF Output [Off], [Int], [Ext] [Off], [Int], [Ext] Digital [Off] [Off] External vector [Ext] [Off] modulation External pulse...
  • Page 97: Carry Out Vector Modulation With External I/Q Signals

    Section 3 Operation Carry out Vector Modulation with External I/Q Signals To set digital (vector) modulation with external I/Q signal input, follow these steps: Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz Preset Cancel Level Resolution...
  • Page 98 3.3 Setting the Modulation Function Sample operation: Carry out digital (vector) modulation with external I/O sig- nal input. <1> Using the cursor keys, move the reverse cursor to the I/Q Mod setup parameter. <2> Using the rotary knob or step keys, open the window and move the reverse cur- sor in the window to “Ext”.
  • Page 99: Carry Out Pulse Modulation With An External Ttl Signal

    Section 3 Operation Carry Out Pulse Modulation with an External TTL Signal To set pulse modulation with external signal input, follow these steps: Connecting an external TTL signal Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz Preset...
  • Page 100 3.3 Setting the Modulation Function <3> Press to accept "Ext" and close the window. <4> Press to light the key lamp and then start the pulse modulation. Digital 3-65...
  • Page 101: Carry Out Modulation With A Digital Modulation Unit

    Section 3 Operation Carry out Modulation with a Digital Modulation Unit To set digital (vector) modulation with a built-in digital Modulation Unit, follow these steps: Sample operation: Carry out digital (vector) modulation by using the built-in MU368040A CDMA digital modulation Unit and installed MX368041A W-CDMA software.
  • Page 102 3.3 Setting the Modulation Function <5> Using the cursor keys, move the reverse cursor to the setup parameter of I/Q Mod. <6> Using the rotary knob or step keys, open the window and move the reverse cur- sor in the window to"Int". <7>...
  • Page 103: Changing Vector Quadurature Ratio

    Section 3 Operation Changing Vector Quadurature Ratio This section shows the procedure for changing the vector quadurature ratio during performing digital modulation using an external modulation signal and digital modulation unit. Sample operation: Adjusting quadurature ratio to correct I and Q phases de- viation when performing digital modulation using an ex- ternal modulation signal <1>...
  • Page 104: Reversing The Rf Spectrum

    3.3 Setting the Modulation Function Reversing the RF Spectrum You can reverse the spectrum of the modulated RF signal by interchanging the I and Q signals. Sample operation: Reversing the RF spectrum <1> Press to open the Configuration Setting screen. Config <2>...
  • Page 105: Setting The Baseband Signal Output

    3.4 Setting the Baseband Signal Output 3.4.1 Outputting I/Q signals I/Q signals generated by the digital modulation unit can be outputted from the I/Q signal connectors on the front panel. Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz Preset...
  • Page 106: Output Differential Signals I/Q

    I/Q signals, or I/Q signals can be outputted. The I/Q signals are available from the front-panel I/Q signal output connectors (which are also used as I/Q input con- nectors). Function Cursor Edit MG3681A Step Digital Modulation Frequency Signal Generator 250kHz -3GHz...
  • Page 107: Adjust I/Q Signal Output

    Section 3 Operation Adjust I/Q Signal Output If the enhanced I/Q signal output option (option 11) is mounted, the output voltage, the DC offset, and guadrature of the I/Q and I/Q signals can be varied. The level is variable in a range of 80 to 120% of the output voltage defined by the setting of the digital modulation unit for the two sets of I, I and Q, Q.
  • Page 108 3.4 Setting the Baseband Signal Output <4> Using the numeric keypad, enter a numeric value of 106 (150 mV (rms)/141 mV (rms) × 100%). <5> Press to accept the numeric value and the units and close the window. MHz/mW <6> Likewise, set the Q Output Level Trimming parameter to 106%. <7>...
  • Page 109: Af Output

    Section 3 Operation 3.4.2 AF output The AF output signal is output with an impedance of 600Ω. An AF synthesizer (option 21) is required to output the AF output signal. <1> Press to open the analog modulation setup screen. Analog Mod <2>...
  • Page 110 3.4 Setting the Baseband Signal Output <8> Select an optional waveform from the item window and press to accept the waveform and then close the window. <Waveform patterns> • Sine: Sine wave • Square: Square wave • Triangular: Triangular wave •...
  • Page 111: Useful Features

    Section 3 Operation 3.5 Useful Features 3.5.1 Locking the panel The panel lock feature disables all the keys, except for the front-panel power switch, the Local key, the Panel Lock key and the Contrast keys. With the panel locked, the user can perform measurement tasks with confidence, because the settings are pro- tected against alteration due to inadvertent pressing of a key.
  • Page 112: Setting Display Features

    3.5 Useful Features 3.5.3 Setting display features Display on/off feature Display Off/On Press on the front panel to turn off the display so that electromagnetic ra- diation from the display surface can be reduced. When the display is off, all the keys are disabled, except for the power switch, the Local key, and the Contrast keys.
  • Page 113 Section 3 Operation <5> Using the rotary knob, move the reverse cursor to “1.0hour”. <6> Press to accept the choice and close the setup window. The setup window can also be opened and the reverse cursor can be moved by using the step keys.
  • Page 114: Turning On/Off The Buzzer

    3.5 Useful Features 3.5.4 Turning On/Off the Buzzer You can turn on/off the buzzer that sounds to alert you to a wrong operation. Sample operation: Turning off the buzzer <1> Press to open Config Parameter Setting screen. Config <2> Press (Common Setup) to open the Common Setup screen.
  • Page 115: Making A Hardcopy Of The Screen

    Section 3 Operation 3.5.5 Making a Hardcopy of the Screen You can store the data displayed on the screen in the ATA flash memory card as a bitmap file. Insert the ATA flash memory card into the memory card slot in the rear panel of this unit.
  • Page 116: Using A Trigger Function To Perform Remote Control

    3.5 Useful Features 3.5.6 Using a Trigger Function to Perform Remote Control Using the trigger function, you can control the following eight operations with the TTL level signals input to the trigger connector on the rear panel of this unit. •...
  • Page 117 Section 3 Operation Set the type of operation to be controlled by assigning to the control selection (C0 to C2) in advance as shown below, and the operation of the selected type is controlled at the falling edge of the trigger input (Trig). Input Operation Trig...
  • Page 118: Changing The Pll Mode

    3.5 Useful Features 3.5.7 Changing the PLL mode By changing the loop characteristics of the PLL synthesizer in the MG3681A, the SSB phase noise characteristics of the RF output can be changed. PLL Mode Normal: The SSB phase noise characteristics at 100 kHz and near off- set frequency is good.
  • Page 119 Section 3 Operation <2> Press (IF/RF Setup) to open IF/RF Setup screen. <3> Move the reverse cursor at PLL Mode, then display the setup window. <4> Select “Narrow”, and press The PLL Mode becomes Narrow, then the SSB phase noise at a few hundred kHz is improved.
  • Page 120: Changing Error Message Display Mode In Remote Control

    3.5 Useful Features 3.5.8 Changing error message display mode in remote control The MG3681A can select one of the following error-message display modes, as shown below. See Section 4 for the remote control and error messages. Remote Error Mode Normal:...
  • Page 121 Section 3 Operation <3> Move the reverse cursor to Remote Error Mode setting parameter. <4> Using the rotary knob or step keys, move the reverse cursor to “Remain”. <5> Press to accept “Remain” and close the set window. 3-86.
  • Page 122: Remote Control

    Section 4 Remote Control This section describes the concepts of the instrument's remote control. Overview..............System Atization ............4.2.1 Connecting devices by a GPIB cable.... 4.2.2 Example of System Atization with GPIB ..4.2.3 Connecting devices by a RS-232C cable..Initialization ..............
  • Page 123 Section 4 Remote Control...
  • Page 124: Overview

    4.1 Overview 4.1 Overview This instrument supports a GPIB interface (IEEE Standard 488.2-1987) and RS- 232C interface so it can team up with an external controller to automate measurement tasks. The remote control facility of this instrument does the following: •...
  • Page 125: System Atization

    Section 4 Remote Control 4.2 System Atization 4.2.1 Connecting devices by a GPIB cable Connect the GPIB connector on the rear panel of this equipment to the GPIB con- nector of an external device with a GIPB cable. Note: Be sure to connect the GPIB cable before turning the equipment power on. Up to 15 devices, including the controller, can be connected to one system.
  • Page 126 4.2 System Atization Set Up GPIB Interface Conditions Press , then (Interface Setup) to open the interface setup screen. Config GPIB interface conditions can be set up on this screen. To set up GPIB interface conditions, follow these steps: <1> Active Port Set “GPIB”.
  • Page 127: Example Of System Atization With Gpib

    When this instrument and the wave analyzer (e.g. MS8608A Digital Mobile Radio Transmitter Tester) are controlled from a host computer via GPIB, a performance test system can be configured. Host Computer Anritsu Mキ3681A This instrument (MG3681A) Thing to be ◎◎ measured Transmitter Tester (MS8608A) Anritsu ...
  • Page 128: Connecting Devices By A Rs-232C Cable

    4.2 System Atization 4.2.3 Connecting devices by a RS-232C cable Connect the RS-232C connector at rear panel of the MG3681A to the RS-232C con- nector of the external device using a RS-232C cross cable. Note: The connection of the RS-232C cable must be performed before turning on the power of the MG3681A.
  • Page 129 Section 4 Remote Control Set Up RS-232C Interface Conditions Press , then (Interface Setup) to open the interface setup screen. Config RS-232C interface conditions can be set up on this screen. To set up RS-232C in- terface conditions, follow these steps: <1>...
  • Page 130: Initialization

    4.3 Initialization 4.3 Initialization IEEE488.2 classifies the process of initializing a GPIB system into three levels and defines them as bus initialization, message exchange initialization, and device ini- tialization. It also requires the devices to be initialized to predefined status when they are powered on.
  • Page 131: Initializing The Bus With

    Section 4 Remote Control 4.3.1 Initializing the bus with IFC commands Explanation IFC commands initialize the interface functions of all the devices connected to the GPIB bus line. Initialization of the interface functions is used for initializing the status (talker, listener, etc.) of the interface functions of the devices that have been configured by the controller.
  • Page 132: Initializing Message Exchanges With Dcl And Sdc Bus Commands

    4.3 Initialization 4.3.2 Initializing message exchanges with DCL and SDC bus commands Explanation Initializes message exchanges on all devices on the GPIB interface having a specified select code or on a selected device. Items of message exchanges that are initialized When this instrument receives DCL and SDC bus commands, it carries out the fol- lowing functions: <1>...
  • Page 133: Initializing Devices With The ∗Rst Command

    Section 4 Remote Control 4.3.3 Initializing devices with the ∗ ∗ ∗ ∗ RST command ∗RST Format One of the IEEE488.2 common commands, the ∗RST (Reset) command gives Level Explanation 3 initialization to a device. The ∗RST (Reset) command is used to initialize the device (this instrument) to a pre- defined status.
  • Page 134: Status In Which The Device (This Instrument) Goes Into When Powered On

    4.3 Initialization 4.3.4 Status in which the device (this instrument) goes into when pow- ered on The device (this instrument), when powered on, goes into the following status: <1> The device is set in the status in which it was when it was last turned off. The device, however, is reset to its defaults (see Appendix C) when it is turned on Preset while holding down...
  • Page 135: Status Structure

    Section 4 Remote Control 4.4 Status Structure The status byte (STB) that is transmitted to the controller is based on the specifica- tions of IEEE488.1. Its component bits are called a “status summary message” and provide a summary description of the current data stored in the registers and queues. 4.4.1 IEEE488.2 standard status model The standard model in the status structure defined by IEEE488.2 is shown below.
  • Page 136 4.4 Status Structure In the status model, an IEEE488.1 status byte is used as the lowest-level status, which consists of seven summary message bits that are supplied from an upper status structure. The status data structure is organized into a register model and a queue model to generate these summary message bits.
  • Page 137: Status Byte (Stb) Register

    Section 4 Remote Control 4.4.2 Status Byte (STB) register The STB register consists of an STB device and an RQS (or MSS) message. ESB and MAV summary messages The ESB and MAV summary messages are described below. ESB summary message The ESB (Event Summary Bit) summary message is a message defined by IEEE488.2.
  • Page 138: Device-Dependent Summary Messages

    4.4 Status Structure 4.4.3 Device-dependent summary messages Bit 0, bit 1, and bit 7 are not used in this instrument, but bits 2 and 3 are used as Event Status register summary bits. The Status Byte register is described below. 4-17...
  • Page 139: Reading From And Clearing The Stb Register

    Section 4 Remote Control 4.4.4 Reading from and clearing the STB register The STB register is read from by serial polling or by using an ∗STB? query. Either way, an STB message as defined by IEEE488.1 is read, but the value that is trans- mitted to bit 6 (position) varies with each method used.
  • Page 140: Service Request (Srq) Enable Operation

    4.4 Status Structure 4.4.5 Service request (SRQ) enable operation Bits 0 to 7 of the Service Request Enable (SRE) register control whether the corre- sponding bits of the STB register will generate an SRQ or not. The SRB register bits are associated with the STB register bits. If the STB register bit associated with a SRE register bit that is 1 is set to 1, the device sets the RQS bit to 1, issuing a service request to the controller.
  • Page 141: Standard Event Status Register

    Section 4 Remote Control 4.4.6 Standard Event Status register Bit definitions of the Standard Event Status register The operations of the Standard Event Status register are shown below. The Standard Event Status Enable (ESE) register specifies which bit of the Event Status register will cause a summary message to become true when it is set.
  • Page 142 4.4 Status Structure Reading from, Writing to, and Clearing the Standard Event Status register Read This register is read from using an ∗ESR? common query. It is cleared when read from. A response message is given as a binary-weighted sum of the event bits to a decimal integer. Write Except for clear, this register cannot be written externally.
  • Page 143: Extended Event Status Register

    Section 4 Remote Control 4.4.7 Extended Event Status register This instrument has bit 1, bit 2, and bit 7 unused and has bits 2 and 3 assigned as an END and an ERR summary bit for use as status summary bits that are available from the extended register model.
  • Page 144 4.4 Status Structure ERR Event Status register bit definitions The operations of the ERR Event Status register are shown below. The ERR Event Status Enable register specifies which bit of the Event Status register will cause a summary message to become true when it is set. Event name Explanation Not used...
  • Page 145 Section 4 Remote Control END Event Status register bit definitions The operations of the END Event Status register are shown below. The END Event Status Enable register specifies which bit of the Event Status register will cause a summary message to become true when it is set. Event name Explanation Not used...
  • Page 146 4.4 Status Structure Reading from, Writing to, and Clearing the Extended Event Status register Read This register is read from using an ESR2? or ∗ESR3? common query. It is cleared when read from. A response message is given as a binary-weighted sum of the event bits to a decimal integer. Write This register cannot be written to externally except that it is cleared.
  • Page 147: Synchronizing This Instrument With The Controller

    Section 4 Remote Control 4.4.8 Synchronizing This Instrument with the Controller Because this instrument handles specified program messages each as a sequential command (completing each command before proceeding to process the next), one-to- one synchronization between this instrument and the controller does not require spe- cial consideration.
  • Page 148 4.4 Status Structure ∗ ∗ ∗ ∗ OPC Service Request Wait This instrument sets the Operation complete bit (bit 0) of the Standard Event Status register when it has executed an ∗OPC command. The controller achieves synchro- nism by waiting for the arrival of an SRQ interrupt. Controller program <1>...
  • Page 149: Device Message Details

    Section 4 Remote Control 4.5 Device Message Details 4.5.1 Program message formats Among all device messages, those that are transmitted from the controller to this in- strument are called “program messages”. Program messages fall into two groups: program commands (commands), which set or specify instrument parameters, and program queries (queries), which request for parameters and measurement results.
  • Page 150 4.5 Device Message Details Program Message Program message unit <Example> PRINT @1; “FREQ 1GHZ; OVLV 0DBM” Multiple commands can be transmitted separately by separating them with semico- lons (;). Program Message Unit Program header Program data The program header of each IEEE488.2 common command begins with an asterisk (∗).
  • Page 151 Section 4 Remote Control Numeric Program Data Numeric program data is grouped into four types: integral (NR1), fixed-point decimal (NR2), floating-point decimal (NR3), and hexadecimal. Integral (NR1) • Integral data can have leading zeros (e.g., 005, +005, −20). • No space is allowed between a sign (+ or −) and the numeric value that follows it. •...
  • Page 152 4.5 Device Message Details Floating-point decimal (NR3) • E denotes raising to the power of 10, or the exponent part. • Spaces are allowed both before and after, only before or only after E/e. • A numeric value is required in the mantissa part. •...
  • Page 153 Section 4 Remote Control Suffix Data The table below lists the suffixes that are used in this instrument. Category Unit Suffix code Frequency GHZ, GZ MHZ, MZ KHZ, KZ Output level dBµV µV µW Deviation (angle) String Program Data ’ <Inserted>...
  • Page 154: Response Message Formats

    4.5 Device Message Details 4.5.2 Response message formats The formats in which the controller transmits response messages from this instru- ment by way of INPUT and other statements are described below. Response message Response message terminator Response Message Terminator Use a TRM command to specify whether a response message or a terminator is used. Response Message Response message unit A response message is composed of one or more response message units to one or...
  • Page 155 Section 4 Remote Control Response Data Character response data Numeric response data String response data Character Response Data Defined strings of data are composed of any of the alphabetical lower case and upper case characters A to Z, the digits 0 through 9, and the underscore (_). Numeric Response Data Integral (NR1) <0to9>...
  • Page 156 4.5 Device Message Details Hexadecimal Data <0to9> String Response Data <Inserted> ’ ’ ’ ’ ’ ’ ASCII character other than " 4-35...
  • Page 157: Common Commands And Supported Commands

    Section 4 Remote Control 4.5.3 Common commands and supported commands The table below lists the 39 kinds of common commands that are defined by the IEEE488.2 standard. The commands marked by a double circle are IEEE488.2 com- mands used with this instrument. Mnemonic Full command name IEEE488.2 default...
  • Page 158: Common Commands Classified By Group Function

    4.5 Device Message Details 4.5.4 Common commands classified by group function The table below lists the IEEE488.2 common commands supported by this instru- ment as classified by group function. Group Group function Mnemonic ∗IDN? System data Provides information dependent on a device connected to the GPIB system (such as its manufacturer's name, type name, and serial number).
  • Page 159: Function Description Of Common Commands

    Section 4 Remote Control 4.5.5 Function description of common commands The table below provides a summary of the common command functions. Command Function ∗IDN? Returns a character string that indicates “manufacturer's name, type name, serial number, firmware version number” ∗RST Gives Level 3 initialization to the device.
  • Page 160: List Of Device Messages By Function

    4.5 Device Message Details 4.5.6 List of Device Messages by Function Command and query messages The header of a command message is expressed in uppercase letters as a reserved word. The header of a query message is ended by a question mark (?). Command and query messages may have multiple arguments delimited from one another by a comma (,).
  • Page 161 Section 4 Remote Control Response Messages A response message is a reply to an incoming query message that is returned to an external controller. A response message is represented by a mix of a response header and response data. A response message may have multiple sets of response data delimited from one another by a comma (,).
  • Page 162 4.5 Device Message Details List of Device Messages by Function <Frequency> Item Device message Control item Command message Query message Response message Frequency value FREQ f FREQ? FREQ f   Step up FRS UP   Step down FRS DN Knob up FRK UP ...
  • Page 163 Section 4 Remote Control <Output Level> Item Device message Control item Command message Query message Response message RF on LVL ON LVL? LVL ON RF off LVL OFF LVL? LVL OFF Output level OLVL l OLVL? OLVL l Step up OLS UP ...
  • Page 164 4.5 Device Message Details <Memory> Item Device message Control item Command message Query message Response message Recall from BPM (Last recalled BPM RECBPM n RECBPM? RECBPM n location number) n : 0 to 511 Step up RBS UP   ...
  • Page 165 Section 4 Remote Control <Memory (continued)> Item Device message Control item Command message Query message Response message BPM Sweep Mode: Single SWPMOD 1 SWPMOD? SWPMOD 1 Sweep Begin BPM location SWPBEG n SWPBEG? SWPBEG n n : 0 to 511 Sweep End BPM location SWPEND n SWPEND?
  • Page 166 4.5 Device Message Details <Analog Modulation> Item Device message Control item Command message Query message Response message Modulation on AMOD ON AMOD? AMOD ON Modulation off AMOD OFF AMOD? AMOD OFF Frequency AF f AF f AF source sine wave AFWAV SINE AFWAV? AFWAV SINE...
  • Page 167 Section 4 Remote Control <Configuration Functions> Item Device message Control item Command message Query message Response message Base frequency and base frequency source  REF? 10 MHz, internal 10MHZ, INT 10 MHz, external 10MHZ, EXT 13 MHz, external 13MHZ, EXT Manual ALC time constant 500ns ALCPT 500NS ALCPT?
  • Page 168 4.5 Device Message Details <Configuration Functions (continued)> Item Device message Control item Command message Query message Response message Safety mode off SAFE OFF SAFE? SAFE OFF PLL mode normal PLLMOD NORM PLLMOD? PLLMOD NORM PLL mode narrow PLLMOD NARR PLLMOD? PLLMOD NARR Remote error display mode normal REMDISP NORM...
  • Page 169 Section 4 Remote Control <Measuring Instrument Common Functions> Item Device message Control item Command message Query message Response message RPP RESET   Display on DSPL ON DSPL? DSPL ON Display off DSPL OFF DSPL? DSPL OFF GPIB Status: END Enable ESE2 n ESE2? n : 0 to 256...
  • Page 170 4.5 Device Message Details < Digital modulation Functions> Item Device message Control item Command message Query message Response message Digital modulation on DMOD ON DMOD? DMOD ON Digital modulation off DMOD OFF DMOD? DMOD OFF I/Q source off IQSRC OFF IQSRC? IQSRC OFF I/Q source internal...
  • Page 171: Device Massage Details In Alpha-Numerical Order

    Section 4 Remote Control 4.5.7 Device massage Details in alpha-numerical order < Example > Header of Message Detail of Header FREQ “ ”(space) is inserted between Frequency command Message and a. Function Sets a frequency Explanation of the value to be inputted Command Message FREQ a value to be inputted.
  • Page 172 ∗ ∗ ∗ ∗ C ∗ ∗ ∗ ∗ CLS Clear Status Command Function Clears the Status Byte register ∗CLS Command Message ∗CLS Use Example ∗CLS all status data (namely, event registers and queues), except for the output Explanation queue and its MAV summary message, and also the associated summary messages. If a ∗CLS command is transmitted after a program message terminator or before a query message unit element, the entire status byte is cleared, In this way, the output queue is cleared along with any unread messages.
  • Page 173 ∗ ∗ ∗ ∗ E ∗ ∗ ∗ ∗ ESE Standard Event Status Enable Command Function Sets or clears the Standard Event Status Enable register. ∗ESE Command Message Explanation Program data equals the sum total of the digit values of the bits that are chosen to be enabled from among 2 = 1, 2 = 2, 2...
  • Page 174 ∗ ∗ ∗ ∗ E ∗ ∗ ∗ ∗ ESE? Standard Event Status Enable Query Function Returns the current value of the Standard Event Status Enable register. ∗ESE? Command Message ∗ESE? returns the current value of the Standard Event Status Enable register in the Explanation NR1 format.
  • Page 175 ∗ ∗ ∗ ∗ E ∗ ∗ ∗ ∗ ESR? Standard Event Status Register Query Function Returns the current value of the Standard Event Status register. ∗ESR? Command Message ∗ESR? returns the current value of the Standard Event Status register in the NR1 Explanation format.
  • Page 176 ∗IDN? returns a response message comprising the four fields described above. <1> Field 1: Product manufacturer's name (in this case, ANRITSU) <2> Field 2: Type name (for this instrument, MG3681A) <3> Field 3: Serial number (10-digit number) <4> Field 4: Firmware version number (for this instrument, 1.0 to 9.99) ∗IDN? returns a response message comprising the above four fields separated from...
  • Page 177 ∗ ∗ ∗ ∗ O ∗ ∗ ∗ ∗ OPC Operation Complete Command Function Sets bit 0 of the Standard Event Status register when the device operation is com- pleted. ∗OPC Command Message ∗OPC sets bit 0, or Operation Complete Bit, of the Standard Event Status register Explanation when the entire device operation that has been selected is completed.
  • Page 178 ∗ ∗ ∗ ∗ R ∗ ∗ ∗ ∗ RST Reset Command Function Performs Level 3 initialization of the device ∗RST Command Message Explanation The RST (Reset) command performs Level 3 initialization of the device. The items of Level 3 initialization are as follows: <1>...
  • Page 179 ∗ ∗ ∗ ∗ S ∗ ∗ ∗ ∗ SRE Service Request Enable Command Function Sets the Service Request Status register bits. ∗SRE Command Message Explanation Program data equals the sum total of the digit values of the bits that are chosen to be enabled from among 2 = 1, 2 = 2, 2...
  • Page 180 ∗ ∗ ∗ ∗ S ∗ ∗ ∗ ∗ SRE? Service Request Enable Query Function Sets Service Request Enable register bits. ∗SRE? Command Message ∗SRE? returns the current value of the Service Request Enable register in the NR1 Explanation format. Response Message Since NR1 = bit 6 cannot be set, the value of NR1 falls somewhere between 0 and 64 and between 128 and 191.
  • Page 181 ∗ ∗ ∗ ∗ S ∗ ∗ ∗ ∗ STB? Read Status Byte Command Function Returns the current value of the status byte, including the MSS bit. ∗STB? Command Message ∗STB? returns the sum of the current value of the status byte register weighted with Explanation binary and the MSS summary message as a response data in the NR1 numeric for- mat.
  • Page 182 ∗ ∗ ∗ ∗ T ∗ ∗ ∗ ∗ TRG Trigger Command Function Requests the execution of a trigger. ∗TRG Command Message ∗TRG executes a triggered action. With this instrument, the contents of the next re- Explanation callable BPM location are recalled. This will produce the same effect as pressing while holding down Memory ∗TRG Controller →...
  • Page 183 ∗ ∗ ∗ ∗ T ∗ ∗ ∗ ∗ TST? Self-Test Query Function Runs an internal self-test to report on the presence or absence of errors. ∗TST? Command Message ∗TST? executes a self-test within the device. The test result is placed on the output Explanation queue to report whether the test has completed successfully without encountering er- rors.
  • Page 184 This is the same as sequential commands. However, since over lap commands are not available with the MG3681A, so this command is not necessary. ∗WAI Controller →...
  • Page 185 Audio Frequency Function Sets the oscillation frequency of the AF source in the analog modulation function. Command Message AF f Value of f 0.01HZ to 400000HZ : 0.01 Hz to 400000 Hz 0.00001KHz to 400KHz : 0.0001 kHz to 400 kHz Query Message Response Message AF a...
  • Page 186 AFOLVL Audio-Frequency-Output Level Function Sets the AF output level of the analog modulation function. Command Message AFOLVL l Value of l 0V to 4V : 0 V to 4 V 0MV to 4000MV : 0 mV to 4000 mV Query Message AFOLVL? Response Message AFOLVL l...
  • Page 187 AFWAV Audio-Frequency Wave Function Sets the AF source waveform for analog modulation. Command Message AFWAV a Value of a SINE : Sine wave SQUARE : Square wave TRIANGULAR : Triangular wave SAWTOOTH : Sawtooth wave Query Message AFWAV? Response Message AFWAV a Limitation This command is functional only if an AF synthesizer (option 21) is mounted...
  • Page 188 ALCPT Manual ALC Parameter Function Sets ALC time constant f. Command Message ALCPT a Value of a AUTO : Time constant is set automatically 500NS : Time constant 500ns 2400NS : Time constant 2.4µs (2400ns) 5000NS : Time constant 5µs (5000ns) 24000NS : Time constant 24µs (24000ns) 50000NS...
  • Page 189 AMCP Amplitude Modulation (AC/DC) Function Selects between AC and DC external AM input coupling of the analog modulation function. Command Message AMCP a Value of a : AC coupling : DC coupling Query Message AMCP? Response Message AMCP a Use Example AMCP DC Amplitude Modulation (ON/OFF) Function...
  • Page 190 AMOD Analog Modulation (ON/OFF) Function Selects between analog modulation on and off. Command Message AMOD a Value of a : Analog modulation On OFF : Analog modulation Off Query Message AMOD a Response Message AMOD? Use Example AMOD ON AMSRC Amplitude Modulation Source Function Selects a source of amplitude modulation (AM) of the analog modulation function.
  • Page 191 ANALOG Analog Modulation Screen Function Displays the analog modulation setting screen. Command Message ANALOG Query Message None Response Message None Use Example ANALOG APMEXP All Parameter Memory Export Function Exports all-parameter memory contents to an ATA card. Command Message APMEXP Query Message None Response Message...
  • Page 192 APMIMP All Parameter Memory Import Function Imports all-parameter memory data stored on an ATA card to the MG3681A’s inter- nal all-parameter memory. Command Message APMIMP Query Message None Response Message None Limitation An execution error occurs if an ATA card is not inserted or a file that has been creat- ed with the APMEXP command is not found.
  • Page 193 BASEBAND Baseband (On/Off) Function Selects On/Off of generating the internal I/Q signal. Command Message BASEBAND a Value of a : On of generating the internal I/Q signal OFF : Off of generating the internal I/Q signal Query Message BASEBAND? Response Message BASEBAND a Limitation This command is functional only if an extension unit is mounted.
  • Page 194 BPMIMP Basic Parameter Memory Import Function Imports basic parameter memory data stored on an ATA card to the MG3681A's in- ternal basic parameter memory. Command Message BPMIMP Query Message None Response Message None Limitation An execution error occurs if an ATA card is not inserted or a file that has been creat- ed with the APMEXP command is not found.
  • Page 195 BPMSKP Basic Parameter Memory SKIP (ON/OFF) Function Selects between skip on and off for a selected Basic Parameter Memory (BPM) loca- tion. Command Message BPMSKP n, ON BPMSKP n, OFF Value of n n=0 to 511 : Basic Parameter Memory (BPM)numbers 0 to 511 : Skip On : Skip Off Query Message...
  • Page 196 Calibration Function Calibrates the level. The bit 1 of END event status register becomes 1. Command Message Query Message None Response Message None Limitation This command is functional only if ALC is off. Use Example CONFBB Config Baseband Setup Screen Function Displays the Baseband Setup screen of the Config screen.
  • Page 197 CONFCO Config Common Setup Screen Function Displays the Common Setup screen of the Config screen. Command Message CONFCO Query Message None Response Message None Use Example CONFCO CONFHW Config Hardware Check Screen Function Displays the Hardware Check screen of the Config screen. Command Message CONFHW Query Message...
  • Page 198 CONFIG Configuration Setup Screen Function Displays the Config screen. The Config screen, in this case, indicates the screen on which a frequency and output level are displayed. Command Message CONFIG Query Message None Response Message None Use Example CONFIG CONFIF Config Interface Setup Screen Function Displays the Interface Setup screen of the Config screen.
  • Page 199 CONFMC Config Maintenance Check Screen Function Displays the Maintenance Check screen of the Config screen. Command Message CONFMC Query Message None Response Message None Use Example CONFMC CONFRF Config IF/RF Setup Screen Function Displays the IF/RF Setup screen of the Config screen. Command Message CONFRF Query Message...
  • Page 200 CONFRP Config Rear Panel Information Screen Function Displays the Rear Panel Information screen of the Config screen. Command Message CONFRP Query Message None Response Message None Limitation This command is available when the digital modulation unit is installed and auxiliary signal is inputted from the rear panel.
  • Page 201 DELAPM Delete All Parameter Memory Function Deletes all-parameter memory contents addressed by an All Parameter Memory (APM) number. Command Message DELAPM n Value of n 0 to 99 : All Parameter Memory (APM) number 0 to 99 Query Message None Response Message None Limitation...
  • Page 202 DIGITAL Digital Modulation Function Moves to digital modulation setting screen. Though the digital modulation setting screen varies depending on the modulation signal source and the selected system, this command displays the screen with fre- quency and output level indication. Command Message DIGITAL Query Message None...
  • Page 203 DSPL Display (ON/OFF) Function Sets the display on or off. Command Message DSPL a Value of a : Display On OFF : Display Off Query Message DSPL? Response Message DSPL a Use Example DSPL ON 4-82...
  • Page 204 ESE2 Event Status Enable Register (END) Function Specifies which bit of the event register associated with the END Event Status En- able register will make ESB summary-message bit 2 true when it is set. Command Message ESE2 n Value of n 0 to 255 Query Message ESE2?
  • Page 205 ESR2? Event Status Register (END) Function Reads the event bits of the END Event Status register converted to a binary-weighted sum total. The END Event Status register is reset to 0 after its read. Command Message None Query Message ESR2? Response Message ESR2 n Value of n...
  • Page 206 Frequency-Incremental-Step Value Function Sets a frequency incremental step value. Command Message FIS f Value of a 0.00000000001 to 1GHZ : 0.00000000001 to 1 GHz 0.00000001 to 1000MHZ : 0.00000001 to 1000 MHz 0.00001 to 1000000KHZ : 0.00001 to 1000000 kHz 0.01 to 1000000000HZ : 0.01 to 1000000000 Hz Query Message...
  • Page 207 FMCP Frequency Modulation /Phase Modulation Coupling (AC/DC) Function Selects external FM/φ M input coupling of the analog modulation function between AC and DC. Command Message FMCP a Value of a : Coupling AC : Coupling DC Query Message FMCP? Response Message FMCP a Use Example FMCP DC...
  • Page 208 FMPHM Frequency Modulation /Phase Modulation (FM/PHM) Function Selects analog modulation between frequency modulation (FM) and phase modula- tion (φ M). Command Message FMPHM a Value of a : FM PHM : φ M Query Message FMPHM? Response Message FMPHM a Use Example FMPHM PHM FMSRC...
  • Page 209 Frequency Offset (ON/OFF) Function Sets frequency offset mode on or off. Command Message FOF a Value of a : Frequency offset mode On OFF : Frequency offset mode Off Query Message FOF? Response Message FOF a Limitation Frequency offset mode may not be set to On depending on the frequency offset value.
  • Page 210 FREQ Frequency Function Sets a frequency. Command Message FREQ f −3 to 3GHZ : −3 to 3 GHz Value of f −3000 to 3000MHZ : −3000 to 3000 MHz −3000000 to 3000000KHZ : −3000000 to 3000000 kHz −3000000000.00 to 3000000000.00HZ : −3000000000.00 to 3000000000.00 Hz Query Message FREQ?
  • Page 211 Frequency-Relative (On/Off) Function Sets relative frequency display mode on or off. Command Message FRL a Value of a : Relative frequency display mode On OFF : Relative frequency display mode Off Query Message FRL? Response Message FRL a Use Example FRL ON FRLR? Frequency-Relative, Reference Value...
  • Page 212 FRLV? Frequency-Relative, Displayed Value Function Returns the displayed frequency when the relative-frequency mode is On. Command Message None Query Message FRLV? Response Message FRLV f −3000000000.00 to 3000000000.00HZ : −3000000000.00 to 3000000000.00 Hz Value of f Use Example FRLV? 4-91...
  • Page 213 Frequency-Resolution Function Sets a frequency setup resolution. Command Message FRR a Value of a 0.01HZ : 0.01 Hz 0.1HZ : 0.1 Hz : 1 Hz 10HZ : 10 Hz 100HZ : 100 Hz 1KZ, 1KHZ : 1 KHz 10KZ, 10KHZ : 10 kHz 100KZ, 100KHZ : 100 kHz...
  • Page 214 Frequency-Incremental-Step (Up/Down) Function Ups and downs a frequency in increments of a preset frequency step. Command Message FRS a Value of a : Incremental step frequency Up : Incremental step frequency Down Query Message FRS? Response Message FRS a Use Example FRS UP 4-93...
  • Page 215 HEAD Response Message Header (On/Off) Function Sets On/Off of the addition of the response message header. Command Message HEAD a Value of a : Adds the response header and the unit. OFF : Adds no response header and unit. Query Message None Response Message None...
  • Page 216 IBOUTOS I Output Offset Function Sets an I-output (differential I signal) offset. Command Message IBOUTOS l −0.5 to 1.5V : −0.5 to 1.5 V Value of l −500.0 to 1500.0MV: −500.0 to 1500.0 mV (0.5 mV step) Query Message IBOUTOS? Response Message IBOUTOS l Limitation...
  • Page 217 IOUTOS I Output Offset Function Sets an I-output offset. Command Message IOUTOS l3 −0.5 to 1.5V : −0.5 to 1.5 V Value of l3 −500.0 to 1500.0MV: −500.0 to 1500.0 mV (0.5 mV step) Query Message IOUTOS? Response Message IOUTOS l Limitation This command is functional only if the additional function of I/Q signal output op- tion (option 11) is mounted.
  • Page 218 IQOOS I/Q Output Offset Function Sets an I/O output level offset. Command Message IQOOS l −0.5 to 1.5V : −0.5 to 1.5 V Value of l −500.0 to 1500.0MV: −500.0 to 1500.0 mV (0.5 mV step) Query Message IQOOS? Response Message IQOOS l Limitation This command is functional only if the additional function of I/Q signal output op-...
  • Page 219 IQOQSK I/Q Output I/Q Quadrature Skew Function Adjusts the I/O Quadrature Skew of the I/Q signal output terminal. Command Message IQOQSK n −5.0 to 5.0DEG : −5.0 to 5.0 deg (0.5 deg Step) Value of n Query Message IQOQSK? Response Message IQOQSK n Limitation This command is functional only if the additional function of I/Q signal output op-...
  • Page 220 Level (ON/OFF) Function Sets the RF output level on or off. Command Message LVL a Value of a : RF output level On OFF : RF output level Off Query Message LVL? Response Message LVL a Use Example LVL ON 4-99...
  • Page 221 MEMAPMREC Memory All Parameter Memory Recall Function Opens the All Parameter Memory (APM) recall screen of the memory function. Command Message MEMAPMREC Query Message None Response Message None Use Example MEMAPMREC MEMAPMSAV Memory All Parameter Memory Save Function Opens the All Parameter Memory (APM) save screen of the memory function. Command Message MEMAPMSAV Query Message...
  • Page 222 MEMBPMED Memory Basic Parameter Memory Edit Screen Function Opens the Basic Parameter Memory (BPM) edit screen of the memory function. Command Message MEMBPMED Query Message None Response Message None Use Example MEMBPMED MEMBPMSWP Memory-Basic Parameter Memory Sweep Screen Function Displays the Basic Parameter Memory Sweeping screen of the memory function. Command Message MEMBPMSWP Query Message...
  • Page 223 OCNT Output-Continuous (ON/OFF) Function Sets output-level continuous mode on or off. Command Message OCNT a Value of a : Continuous mode On OFF : Continuous mode Off Query Message OCNT? Response Message OCNT a Limitation When ALC is Off, or output-level unit system is W or V; the continuous mode be- comes Off.
  • Page 224 OLDBM Output-Level Unit to dBm Function Switches the output level unit to dBm. Command Message OLDBM Query Message None Response Message None Use Example OLDBM OLDBU Output-Level Unit to DBU Function Switches the output level unit to dBµV. Command Message OLDBU Query Message None...
  • Page 225 Output-Level Rotary-Knob (Up/Down) Function Ups and downs the output level in increments of a preset output level resolution. Command Message OLK a Value of a : Up by preset output level resolution : Down by preset output level resolution Down Query Message OLK? Response Message...
  • Page 226 Output-Level-Incremental-Step Up/Down Function Ups and downs the output level in increments of a preset step. Command Message OLS a Value of a : Up by incremental step output level : Down by incremental step output level Query Message OLS? Response Message OLS a Use Example OLS DOWN...
  • Page 227 OLVL Output Level Function Sets an output level. Command Message OLVL l −193 to 67DBM : −193.00 to 67.00 dBm Value of l 5.0AW to 50.1MW : 5.0 aW to 50.1 mW −79.99 to 180.01DBU : −79.99 to 180.01 dBµV : 0.016 µV to 1.58 V 0.016UV to 1.58V : 0.032 µV to 3160 mV...
  • Page 228 Output-Level-Offset (ON/OFF) Function Sets output level offset mode on or off. Command Message OOF a Value of a : Output level offset mode On OFF : Output level offset mode Off Query Message OOF? Response Message OOF a Limitation With output level unit W or V, output level offset mode is fixed at off. (If output level offset mode has been set to on, it is set at off automatically.) Use Example OOF OFF...
  • Page 229 Output-Level-Relative (ON/OFF) Function Sets relative output level display mode on or off. Command Message ORL a Value of a : Relative output level display mode On OFF : Relative output level display mode Off Query Message ORL? Response Message ORL a Limitation With output level unit W or V, relative output level display mode is fixed at off.
  • Page 230 ORLV? Output-Level-Relative, Displayed Value Function Returns the output level displayed on the screen when the relative output level dis- play mode is ON. Command Message None Query Message ORLV? Response Message ORLV l −160 to 160DB : −160.00 to 160.00 dB Value of l Use Example ORLV?
  • Page 231 Phase Modulation Function Sets a phase modulation (φ M) deviation. Command Message PHM l −12.56 to 12.56RAD : −12.56 to 12.56 rad (0.01 rad steps) Value of l −720 to 720DEG : −720 to 720 deg (1 deg step) Query Message PHM? Response Message PHM l...
  • Page 232 Pulse-Modulation (ON/OFF) Function Sets pulse modulation (PM) signal source of digital modulation function. Command Message PMO a Value of a : External pulse-modulation signal source OFF : Pulse modulation Off : Internal pulse-modulation signal source EXT : External pulse-modulation signal source Query Message PMO? Response Message...
  • Page 233 QBOUTOS Q Output Offset Function Sets a Q output (differential Q signal) offset. Command Message QBOUTOS l −0.5 to 1.5V : −0.5 to 1.5 V Value of l −500.0 to 1500.0MV: −500.0 to 1500.0 mV (0.5 mV steps) Query Message QBOUTOS? Response Message QBOUTOS l...
  • Page 234 QOUTOS Q-Output Offset Function Sets a Q output offset. Command Message QOUTOS l −0.5 to 1.5V : −0.5 to 1.5 V Value of l −500.0 to 1500.0MV: −500.0 to 1500.0 mV (0.5 mV steps) Query Message QOUTOS? Response Message QOUTOS l Limitation This command is functional only if the additional function of I/Q signal output op- tion (option 11) is mounted.
  • Page 235 Recall Basic Parameter Memory UP/Down Function Increments or decrements the basic parameter memory location number to read the stored data. Command Message RBK a Value of a : Basic Parameter Memory (BPM) number Up : Basic Parameter Memory (BPM) number Down Query Message None Response Message...
  • Page 236 RECAPM Recall All Parameter Memory Function Recalls the stored data from a specified all-parameter memory location. Command Message RECAPM n Value of n 0 to 99 : All Parameter Memory (APM) number 0 to 99 Query Message RECAPM? Response Message RECAPM n Limitation If the digital modulation unit in use is not mounted when the data is...
  • Page 237 REF? ? ? ? Reference Frequency Source Function Retrieves information about the reference frequency signal for this instrument. Command Message None Query Message REF? Response Message REF a1, a2 Value of a1 10MHZ : 10 MHz 13MHZ : 13 MHz Value of a2 : Internal reference oscillator EXT : External reference oscillator...
  • Page 238 RFHIGH RF high level output On/Off Function Sets a RF high level output mode. Command Message RFHIGH a Value of n : RF high level output mode On : RF high level output mode Off Query Message RFHIGH? Response Message RFHIGH a Limitation This command is functional only if an RF high level output (option 42) is mounted.
  • Page 239 SAFE Safety-Mode (ON/OFF) Function Sets safety mode on or off at the time of output level setup. Command Message SAFE a Value of a : Safety mode On OFF : Safety mode Off Query Message SAFE? Response Message SAFE a Use Example SAFE OFF SAVAPM...
  • Page 240 SAVBPM Save Base Parameter Memory Function Saves a parameter to a specified Basic Parameter Memory location. Command Message SAVBPM n Value of n 0 to 511 : Basic Parameter Memory (BPM) number 0 to 511 Query Message SAVBPM? Response Message SAVBPM n Limitation If data already exists at the specified Basic Parameter Memory (BPM) number, it is...
  • Page 241 SCPEXP Screen Copy Export Function Outputs the screen copy (Bit Map file) to the ATA card. Command Message SCPEXP Query Message None Response Message None Limitation This command is available when the ATA card is installed. Use Example SCPEXP SCRSAV Screen Saver Function Sets a period of time that should expire before the screen saver is launched.
  • Page 242 SPREV RF Spectrum Reverse Function Sets RF spectrum reversing (Exchange I phase for Q phase.) Command Message SPREV a Value of a : Spectrum reverse : Spectrum normal NORM Query Message SPREV a Response Message SPREV? Use Example SPREV ON Sweep Control Function Controls the Basic Parameter Memory Sweeping function.
  • Page 243 SWPBEG Sweep Begin Function Specifies the number of the Basic Parameter Memory with which a sweep starts. Command Message SWPBEG n Value of n 0 to 511 : Basic Parameter Memory number 0 to 511 Query Message SWPBEG ? Response Message SWPBEG n Use Example SWPBEG 62...
  • Page 244 SWPMOD Sweep Mode Function Sets the sweep mode when the Basic Parameter Memory is sweeped. Command Message SWPMOD a Value of a : Auto (Repeated sweeping) : Single (Single sweeping) Query Message SWPMOD? Response Message SWPMOD a Use Example SWPMOD 0 SWPPAT Sweep Pattern Function...
  • Page 245 SWPTIM Sweep Time Function Sets the interval to read the specified Basic Parameter Memory number being swept. Command Message SWPTIM a1 a2 Value of a a1=0 to 511 : Basic Parameter Memory number a2=1MS to 600S : Interval (1ms to 600s, 1ms steps) Query Message SWPTIM? SWPTIM? a1...
  • Page 246 GPIB Terminator Function Switches the response message terminator. Command Message TRM a Value of a : LF : CR/LF Query Message TRM? Response Message TRM? a Use Example TRM 1 4-125...
  • Page 247 VDSPL Volt Unit for Display Function Switches the voltage unit. Command Message VDSPL a Value of a : EMF (emf voltage display) TERM : TERM (Terminating voltage display) Query Message VDSPL? Response Message VDSPL a Use Example VDSPL EMF 4-126...
  • Page 248 Wide Band Amplitude Modulation (ON/OFF) Function Sets wide-band amplitude modulation (W-AM) of analog modulation function on or off. Command Message WAM a Value of a : W-AM On OFF : W-AM Off Query Message WAM ? Response Message WAM a Limitation When the digital modulation is On, the W-AM is fixed to Off.
  • Page 249 4-128.
  • Page 250: Calibration And Performance Test

    Calibrating frequencies with an oscilloscope ........Performance Test ............5.2.1 Performance test ........... 5.2.2 Test apparatus for MG3681A ......5.2.3 Testing the output frequency ......5.2.4 Testing the output level frequency response .. 5.2.5 Testing the output level accuracy ....5-10 5.2.6...
  • Page 251 Section 5 Calibration and Performance Test...
  • Page 252: Calibration

    5.1 Calibration 5.1 Calibration 5.1.1 Calibration Even if the unit is functioning normally, calibrate it periodically to keep its perfor- mance from being degraded. Calibrating the unit once or twice a year is recommended. If the unit fails to meet specifications after calibration, contact our service depart- ment.
  • Page 253: Calibrating Frequencies With An Oscilloscope

    The flow of calibration using an oscilloscope is described below. Reference oscillator frequency Ext Trig In Buff Out Frequency standard Oscilloscope MG3681A RF Output RPP Reset <1> Keep turned off. <2> Connect the reference signal output (Buff Output) on the rear panel of the unit to the Y-axis terminal of the oscilloscope.
  • Page 254 5.1 Calibration <6> If synchronism is not achieved, turn the trimmer in the reference oscillator fre- quency calibration hole on the unit’s rear panel with a screwdriver until the in- put waveform appearing on the oscilloscope comes to rest. If a 10 MHz standard signal is applied from this unit to the X-axis terminal of the os- cilloscope, a Lissajous waveform will be generated.
  • Page 255: Performance Test

    Section 5 Calibration and Performance Test 5.2 Performance Test 5.2.1 Performance test Perform the performance test of the unit as preventive maintenance to keep its per- formance from being degraded. Carry out the performance test if verification of the unit performance is required, such as after an inspection, after a scheduled inspection, or after a repair period.
  • Page 256: Test Apparatus For Mg3681A

    5.2 Performance Test 5.2.2 Test apparatus for MG3681A The apparatuses used for testing the unit are shown below: Recommended apparatus name Performance test Performance requirement* (Anritsu model name) Output frequency 100 kHz to 3 GHz, Frequency counter resolution 10 mHz...
  • Page 257: Testing The Output Frequency

    Ref Output Anritsu MF2412A RF Input RF Output MG3681A Frequency counter <1> Connect the reference signal output (10 MHz) of the frequency counter to the external reference input terminal (Ref Input) of this unit to achieve frequency synchronism. <2> Set the frequency counter to 10 mHz measuring resolution.
  • Page 258: Testing The Output Level Frequency Response

    Anritsu Mキ3681A Anritsu POW ER METER ML4803A Sensor Input RF Output MG3681A Power meter Preset <1> Press to preset the unit. <2> Calibrate the sensor (zero point, sensitivity). <3> Connect the power sensor directly to the unit's RF output connector.
  • Page 259: Testing The Output Level Accuracy

    Anritsu ML2530A Anritsu Mキ3681A RF Output RF Input MG3681A Calibration receiver <1> Connect the unit's reference signal output (Buff Output) to the external referen- ce input terminal (Ref Input) of this unit to achieve frequency synchronism. Preset <2> Press to preset the unit.
  • Page 260: Testing The Harmonic Spurious Output

    The sequence of testing the harmonic spurious output is described below. Anritsu  Anritsu MS2661C Mキ3681A RF Output RF Input MG3681A Spectrum analyzer Preset <1> Press to preset the unit. <2> Set the spectrum analyzer to a +10 dBm reference level. Also, set the unit to a 0 dBm output level.
  • Page 261: Testing The Amplitude Modulation Frequency Response

    MODULATION ANALYZER MS616B Output AM In RF In Output Oscillator MG3681A Modulation analyzer Preset <1> Press to preset the unit. <2> Set the low-frequency oscillator to 2 V (p-p) output (600Ω terminating voltage). <3> Set the unit to a 0 dBm output level and the source of amplitude modulation to external (Ext), and then turn on amplitude modulation.
  • Page 262: Testing The Frequency Modulation Frequency Response

    MODULATION ANALYZER MS616B Output RF In FM/φM In Output Oscillator MG3681A Modulation analyzer Preset <1> Press to preset the unit. <2> Set the low-frequency oscillator to 2 V (p-p) output (600Ω terminating voltage). <3> Set the unit to a 0 dBm output level and the source of frequency modulation to external (Ext), and then turn on frequency modulation.
  • Page 263: Testing The Phase Modulation Frequency Response

    MODULATION ANALYZER MS616B Output RF In FM/φM In Output Oscillator MG3681A Modulation analyzer Preset <1> Press to preset the unit. <2> Set the low-frequency oscillator to 2 V (p-p) output (600Ω terminating voltage). <3> Set the unit to a 0 dBm output level and the source of phase modulation to ex- ternal (Ext), and then turn on phase modulation.
  • Page 264: Testing The Vector Modulation Frequency Response

    M キ 3681A I In Q In RF In Output Two-channel synthesizer MG3681A Spectrum analyzer Preset <1> Press to preset the unit. <2> Set the two-channel synthesizer to 1 V (p-p) output (50Ω terminating voltage) and a phase gap of 90° between CH1 and CH2.
  • Page 265 Section 5 Calibration and Performance Test <7> Vary the frequency setting of the two-channel synthesizer and measure and re- cord the sideband signal level with the spectrum analyzer. X dB +50MHz -50MHz Path of the image Path of the sideband <8>...
  • Page 266: Consumables

    5.3 Consumables 5.3.1 About Consumable Supplies The following parts installed in MG3681A have the lifetimes according to the num- ber of times of the operation or the electrified time. Pay attention to the lifetimes of the parts when using the equipment continuously.
  • Page 267: Checking On The Maintenance Screen

    Section 5 Calibration and Performance Test 5.3.2 Checking on the Maintenance Screen Using the Maintenance screen, you can check the operation time of this unit and the operation count of the step attenuator (consumable supply). The procedure to open the Maintenance screen is as follows: <1>...
  • Page 268: Storage And Transportation

    Section 6 Storage and Transportation Before daily maintenance of the unit, be sure to turn it off and unplug it from the AC outlet. Daily Maintenance ............. Tips on Storing the Unit for an Extended Period ..Repackaging and Shipping........Storing Memory Cards..........
  • Page 269 Section 6 Storage and Transportation...
  • Page 270: Daily Maintenance

    6.2 Tips on Storing the Unit for an Extended Period 6.1 Daily Maintenance Before daily maintenance of the unit, be sure to turn the power off and unplug it from the AC outlet. Unit surface dirt When surface dirt is noticeable, after the unit has been used in a dusty environment, or when the unit has not been used for an extended period of time, wipe its surface with a cloth moistened in detergent.
  • Page 271: Repackaging And Shipping

    Section 6 Storage and Transportation 6.3 Repackaging and Shipping When shipping the unit, consider these instructions: Recapping Repack the unit in the packing material (box) in which it had been delivered. If the packing material has been scrapped or damaged, repack the unit in the following manner: <1>...
  • Page 272: Appendix A Specifications

    Appendix A Specifications Appendix A Specifications Basic Performance <Frequency> Item Specification Range 250 kHz to 3000 MHz (setting range: 0 to 3000 MHz) Resolution 0.01 Hz Accuracy Based on the reference oscillator accuracy Accuracy during frequency modulation: Accuracy of reference oscillator ± (5% of FM deviation + 5 Hz) Internal reference oscillator −6...
  • Page 273 Appendix A Specifications <Output Level> Item Specification −143 to +13 dBm (setting range: −143 to +17 dBm) Range Unit Power units (−143.00 to +17.00 dBm) (5.01 to 999 aW, 1.00 to 999 fW, 1.00 to 999 pW, 1.00 to 999 nW, 1.00 to 999 µW, 1.00 to 50.1 mW) Voltage units (Terminating voltage display: −36.01 to +123.99 dBµV) dBµV...
  • Page 274 Appendix A Specifications <Output Level (continued)> Item Specification ALC mode • ALC On Application : Used to generate a continuous wave or a pulse modulation wave (burst wave) whose RF On time is 10 µs or longer. ALC time constant: Auto/500ns/2.4 µs/5 µs/24 µs/50 µs/240 µs/500 µs In the Auto mode,the ALC time constant is selected automatically according to the frequency,amplitude modulation state,and vector modulation state (when a digital modulation unit is used).
  • Page 275 Appendix A Specifications Modulation Function <Amplitude Modulation (AM)> Item Specification Range 0 to 100% (INT AM and EXT AM cannot be set separately when they are modulated at the same time.) Resolution 0.1 % ≤ 0 dBm, ALC On, reference modulation frequency = 1 kHz, ±1.5 dB bandwidth: Modulation frequency response Lower frequency limit : DC (INT AM or EXT AM DC Coupling)
  • Page 276 Appendix A Specifications <Frequency Modulation (FM)> Item Specification 0 to 1000 kHz (≥10 MHz, ≤1010 MHz) Range 0 to 2000 kHz (>1010 MHz) (INT FM and EXT FM cannot be set separately when they are modulated at the same time.) Resolution 10 Hz (0 to 10 kHz deviation) 100 Hz (10.1 to 100 kHz deviation)
  • Page 277 Appendix A Specifications <Phase Modulation (φ φ φ φ M)> Item Specification 0 to 6.28 rad (≥10 MHz, ≤1010 MHz) Range 0 to 12.56 rad (>1010 MHz) (INTφM and EXTφM cannot be set separately when they are modulated at the same time.) Unit rad, deg...
  • Page 278 Appendix A Specifications <High-Speed Analog Modulation (Wide AM)> Item Specification External modulation, input level = 0.9 V (p-p), carrier frequency ≥ 100MHz, output Modulating frequency level ≤ 0 dBm, reference modulation frequency = 1 kHz: response DC to 15 MHz (±2 dB) DC to 30 MHz (±3 dB) Internal modulation Depends on the attached digital modulation unit...
  • Page 279 Appendix A Specifications <Vector Modulation> Item Specification External modulation, input level = 0.5 V (rms), carrier frequency ≥ 100 MHz, and Modulating frequency output level ≤ 0 dBm, reference modulation frequency = 1 kHz: response DC to 15 MHz (±2 dB) DC to 30 MHz (±3 dB) External modulation, input level = 0.5 V (rms), carrier frequency ≥...
  • Page 280 Appendix A Specifications <AF Signal Output> ∗ ∗ ∗ ∗ Only when the AF synthesizer (option 21) is installed Item Specification Level Depends on the installed AF synthesizer Output signal source Depends on the installed AF synthesizer Output connector Impedance : 600Ω...
  • Page 281 Appendix A Specifications Other Functions <Memory Function> Item Specification Basic parameter memory • Kinds of items stored Frequency and level • Memory capacity 512 sets • Memory recall modes • Frequency only : Only frequencies are recalled and set. • Output level only : Only output levels are recalled and set.
  • Page 282 Appendix A Specifications <Offset Display> Item Specification Parameters Frequency and output level (dB unit only) Setting and display in Entered and displayed as offset values. offset value display mode [Current setting] = [Entered and displayed value] − [Offset value] Offset range •...
  • Page 283 Appendix A Specifications External Control <GPIB> Item Specification Controlled items All functions, except for the power switch, the Local key, the Panel lock key, and the Contrast key, can be controlled. Interface SH1, AH1, T5, L4, TE0, SR1, RL1, DP0, PP0, DC1, DT1, C1, E2 Connector Rear panel <RS-232C>...
  • Page 284 Appendix A Specifications Protective Circuit <Reverse Power Protection> Item Specification Protective means The RF output circuit is cut off upon application of External Electric power to the RF output, to protect the internal circuit. The RF output circuit is released by reset input from the panel or under external control.
  • Page 285 Appendix A Specifications Options <Reference Crystal Oscillator, Option 01> Item Specification Frequency 10 MHz −9 ±5 × 10 Aging rate /day −7 ±1 × 10 Startup characteristics (after 10 minutes of operation, relative to 24 hours after power was turned on) −8 ±3 ×...
  • Page 286 Appendix A Specifications <AF Synthesize, Option 21> Item Specification Summary Can be used as an AF output facility and as a source of internal modulating signals for analog modulation Frequency • Range 0.01 Hz to 400 kHz • Resolution 0.01 Hz •...
  • Page 287 Appendix A Specifications A-16.
  • Page 288: Appendix B Message Displays

    Appendix B Message Displays Appendix B Message Displays Error Messages Filing Errors Error message Explanation No ATA PC Card Invalid ATA PC card Down Load Failure Download failure Invalid File Version Unmatched version number (Download failure) Invalid File Format Invalid file format No Spaces In PC Card Not enough space Card Removed During Access...
  • Page 289 Appendix B Message Displays Internal Errors Error message Explanation Backup Failure, All Parameter Initialized Corrupted SRAM (Backup failure) REMOTE: Response Failure Remote message response failure Unlock Hardware error...
  • Page 290 Appendix B Message Displays Status Messages Operation in progress Status Messages Explanation Wait A Moment: File Downloading File being downloaded Wait A Moment: Memory Storing Writing to internal memory Wait A Moment: File Exporting File being exported Wait A Moment: File Importing File being imported Wait A Moment: Calculating Pattern being calculated...
  • Page 291 Appendix B Message Displays B-4.
  • Page 292: Appendix C Default Value List

    Appendix C Default Value List <Frequency Functions> Screen display frequency 0.250 000 00 MHz Offset frequency 0.00 Hz Offset On/Off Relative On/Off Resolution digit (reverse digit) 0.01 Hz (least significant digit) Incremental step frequency 0.01 Hz <Output Level Functions> RF On/Off −143.00 dBm Output level Display unit...
  • Page 293 Appendix C Default Value List <Analog Modulation Functions> Analog modulation on/off Internal AF source oscillation frequency * 1,000.00 Hz frequency resolution digit * 0.01 Hz digit Internal AF source waveform * Sine Internal AF source output on/off * Internal AF source output level * 0.000 V (p-p) Internal AF source output offset * 0.000 V (p-p)
  • Page 294 Appendix C Default Value List <Configuration Functions> RF output quadurature ratio adjustment RF spectrum reverse I/Q output on/off * I/Q output quadurature ratio adjustment 0 deg I/I-output level adjustment * 100.0 % Q/Q-output level adjustment * 100.0 % I-output offset * 0.00 V I-output offset * 0.00 V...
  • Page 295 Appendix C Default Value List C-4.
  • Page 296: Appendix D Performance Test Report Form

    Appendix D Performance Test Report Form Appendix D Performance Test Report Form Test Location Report No. Date Test Officer Instrument Name MG3681A digital modulation signal generator Serial No. Ambient °C Temperature Power Relative Frequency Humidity Remarks: Output Level Frequency Responses (Section 5.2.3)
  • Page 297 Appendix D Performance Test Report Form Output Level Accuracy (Section 5.2.5) Result Output Minimum Maximum Measurem Level Rating Rating Setting 10 MHz 100 MHz 300 MHz 600 MHz 1000 MHz Uncertainty −1.0 dB +13 dBm +1.0 dB −1.0 dB +10 dBm +1.0 dB −1.0 dB +5 dBm...
  • Page 298 Appendix D Performance Test Report Form Harmonic Spurious Output (Section 5.2.6) Settings Result Maximum Rating Measurement Frequency Output level 2nd harmonics 3rd harmonics Uncertainty −30 dBc 1 MHz −30 dBc 10 MHz −30 dBc 100 MHz −30 dBc 300 MHz −30 dBc 600 MHz 0 dBm...
  • Page 299 Appendix D Performance Test Report Form Phase Modulation Frequency Responses (Section 5.2.9) Settings Minimum Result Maxim Measure ment Frequency Output Rating Rating Uncertai 1 kHz 3 kHz 10 kHz 20 kHz level φM 1rad / 5rad φM 1rad / 5rad φM 1rad / 5rad φM 1rad / 5rad 10 MHz...
  • Page 300: Index

    Index External I/Q Signal 3-60 《 《 《 《 Index》 》 》 》 External TTL Signal 3-62 Adapter Address 3-51 Amplitude Modulation 3-49 Frequency 3-15,4-41,5-8 Analog Modulation 3-48 Frequency Modulation 3-51,4-41,5-13 3-72 2-3,5-17 All Parameter Memory 3-43 Function menu 3-11 3-49 Fuse 1-4,2-5...
  • Page 301 Index Quadurature 3-66 Recall 3-36,3-46 Recalling pattern 3-38 Relative 3-20,3-27 Release voltage Reverse cursor 3-11 Rotary Knob 3-12 Safety Mode 3-30 Save 3-35,3-44 Screen Saver Delay 3-75 Self Check 3-10 Service request 4-19 Set up Window 3-13 Skip 3-39 Status 4-14 Step attenuator 5-17,5-18...

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