BKPRECISION_4075_4078_manual 电路图.pdf

Model: 4075, 4078 25 MHz Arbitrary Function Generator USER MANUAL RadioFans.CN 收音机爱 好者资料库 2 SERVICE INFORMATION Warranty Service: Please go the support and service section on our website to obtain a RMA #. Return the product in the original packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Non-Warranty Service: Please go the support and service section on our website to obtain a RMA #. Return the product in the original packaging to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Customers not on an open account must include payment in the form of a money order or credit card. For the most current repair charges please refer to the service and support section on our website. Return all merchandise to B press YES to execute the predefined waveform. On the NOISE function a menu of ADD and NEW is prompt to select a new noise waveform or to add noise to the existing waveform. F4: MORE - Displays the following Menu: Morel Display F1: COPY - Displays the Copy menu (see the Copy Function later in this section). F2: CLEAR - Displays the Clear menu (see the Clear Function later in this section). F3: PROT - Displays the Protect menu (see the Protect Function later in this section). 29 F4: SHOW WAVE - Display the Arbitrary waveform in full screen mode on LCD display. This is only an approximated display for quick viewing. It does not represent the exact waveform being generated. To return back to the MENU selection, press any button. Full Display Example Copy Function. Copies an area of waveform memory to another area of waveform memory. F1: FROM - Selects the address of the first point to copy. F2: LENG - Selects the length (number of points) of the waveform to copy. F3: TO - Selects the destination address where the first point is copied. F4: EXEC - Prompts you to confirm whether to copy. Press NO to abort copying, YES to copy. Clear Function. Clears (sets the data values to zero) either a section of or all of waveform memory. F1: FROM - Selects the address of the first point to clear. F2: TO - Selects the address of the last point to clear. F3: ALL - Clears the whole waveform memory. Equivalent to selecting from 1 to 400,000. F4: EXEC - Prompts you to confirm whether to clear. Press NO to abort clearing, YES to clear. Protect Function. Protects (makes read-only) a section of waveform memory. F1: FROM - Selects the address of the first point to protect. F2: TO - Selects the address of the last point to protect. F3: ALL - Protects the whole waveform memory. Equivalent to selecting from 1 to 400,000. Note: You can protect only one segment of waveform memory at a time. F4: ON/OFF - Selects the unprotect mode and resets memory protection so that the whole waveform memory can be written into. 30 3.6.5 PULSE Menu Pulse Menu F2: PULSE - Selects the Pulse parameters entry. And then: F1: FREQ/PERIOD - Selects the parameter definition of the Pulse repetition period. F2: WIDTH - Selects the Width of the generated pulse. F3: EQUAL EDGE - Selects equal Rise (Leading edge) and Fall (Trailing edge) times of the pulse. F4: LEAD-TRAIL - Selects different Rise and Fall times of the Pulse. 3.6.6 UTILITY Key Utility Menu F1: GPIB - (optional) Selects the GPIB remote mode of operation. After selection the GPIB address can be set to any value from 1 to 31 using the rotary knob. The value is kept in a nonvolatile memory and used at power-on. The factory default address is 9. Setting the address to 31 puts the device in the off-bus state (it will not respond to messages on the GPIB bus). F1:RS232 - Selects the RS232 remote control mode. After selection, the baud rate can be selected as 2400, 9600, and 19200. The RS-232 uses 8 bit data, 1 stop bit and no parity. F2: RECALL - Recalls a previously stored front-panel setup from the selected buffer. Change the buffer number by using the rotary input knob. Valid storage buffer numbers are from 0 to 49. Buffer 0 is the factory default setup. 31 F2: STORE - Stores the current front-panel setup to the specified storage buffer. Change the buffer number by using the numeric keypad or the rotary input knob. Valid storage buffer numbers range from 1 to 49. Below is a list of parameters that can be stored in each buffer. Note: Location 50 is for last working setup before power down. List of Stored Parameters Stored Parameters FREQUENCY RATE(ARB) AMPLITUDE FUNCTION OFFSET REPETITION MODE N-BURST START ADRS WAVELENGTH TRIG SOURCE OUTPUT SWEEP MODULATION *The RECALL and STORE function can be used as a tool to store and locate many arbitrary waveforms. Because the 4075 and 4078 are designed with one large memory bank (up to 400,000 points of storage), users can have the freedom to store as many waveforms of different lengths as they desired in a dynamic fashion (with the limit of total points not to exceed memory capacity). Then, by using STORE and RECALL functions to save the starting address and lengths of each created arbitrary waveforms, users can quickly locate (in the memory) and output each of the different waves. These functions can behave like reference points, so users can actually save up to 49 different waveform reference points in the memory. See example illustration below to see how it works: Stored Buffer number Data points of different waveforms 1 400,000 Waveform 1 Waveform 4 Waveform 2 Waveform 3 A pts. B pts. C pts. D pts. A pts. + B pts. + C pts. + D pts. 400,000 pts. Point Point 32 (Start address + length) 1 A pts. 2 B pts. 3 C pts. 4 D pts. From the above illustration, all the points of Waveform 1 can be stored and recalled using buffer #1. Likewise, Waveform 2 can be stored/recalled by buffer #2. Waveform 3 by buffer #3. Waveform 4 by buffer #4. F3: POWER - (Power-on default) Selects the power-on default setting. Select a value using the numeric keypad or the rotary input knob. The selection is effective after a 10 s time-out period. Select zero (0) to have the waveform generator power on with the factory default settings. Select 50 to have the waveform generator power-on with the settings it had at the last power-off. Select any other value in the range from 1 to 49 to have the waveform generator power-on with the settings that you have saved with F2:STORE(see above) in the range of 1 to 49. 3.6.7 SWEEP Key Selects the Sweep Mode and allows the entering of sweep parameters as Sweep Start, Sweep Stop and Sweep Rate. To select the sweep mode, press SWEEP, then press the function key that corresponds to the desired Sweep menu option, as shown: Sweep Menu F1: ON/OFF - Operates the sweep function, selecting between Sweep On or Off. F2: START/STOP - Defines the Sweep Start and Stop frequencies. F3: RATE - Defines the Sweep Rate. F4: LIN/LOG - Selects the Sweep Shape, LIN or LOG. 33 Log Sweep Menu 3.6.7.1 How to Setup Sweep in Different Modes By default, turning ON the sweep function will automatically set to a continuous (CONT) sweep. In order to change to other modes of sweep, do the following: 1. Set sweep to ON FIRST by pressing F1. 2. Then, press the MODE button on front panel. 3. Select between triggered (TRIG), burst (BURST) or gated (GATE) mode. Note: If this is done before turning on sweep, sweep ON selection will automatically reset to default (which sweeps in continuous mode). 3.6.8 MODULATION Key Selects the Modulation mode AM, FM or FSK. To select the output mode, press MODUL key, then press the function key that corresponds to the desired menu option, as shown: Modulation Menu F1: AM If the AM is selected, the following menu is available: AM Menu F1: ON/OFF - Selects the Modulation ON or OFF operating mode. F2: % /SHAPE - Defines the modulation depth (from 0 to 100%) and the modulation shape between SINE, TRIANGLE or SQUARE . 34 F3: MOD-FREQ - Selects the modulation frequency, from 0.1 Hz to 20.00 KHz. F4: EXT/INT - Selects and enables the external modulation by an external signal applied to the Modulation In connector. F2: FM If the FM is selected, the following menu is available: FM Menu F1: ON/OFF - Selects the Modulation ON or OFF operating mode. F2: DEV/ SHAPE - Defines the FM deviation frequency or the modulation shape, between SINE, TRIANGLE or SQUARE. F3: MOD-FREQ - Selects the modulation frequency, from 0.1 Hz to 20.00 KHz. F4: EXT/INT - Selects and enables the external modulation by an external signal applied to the Modulation In connector. F3: FSK If the FSK is selected, the following menu is available: FSK Menu F1: ON/OFF - Selects the FSK ON or OFF operating mode. F2: F-HI/F-LO - Defines the High and Low frequency of the FSK. F3: RATE - Selects the rate of alternation between the low and high frequencies. F5: EXT/INT - Selects and enables the external FSK when the unit frequency is alternating between the low and high frequencies by an external signal applied to the Trig In connector. 35 3.7 ON Key Use these key to control the main output signal. When the output is active, an internal LED will illuminate the button. 3.8 Cursor Movement Keys Use these keys to move the cursor (when visible) either left or right. They are used in conjunction with the rotary input knob to set the step size of the rotary input knob. 3.9 Rotary Input Knob Use this knob to increase and decrease numeric values or to scroll through a list. The cursor indicates the low-order position of the displayed value which changes when you rotate the knob (for straight numeric entries only). For other types of data, the whole value changes when you rotate the knob. 3.10 Power-On Settings At power-on, the waveform generator performs a diagnostic self-test procedure to check itself for errors. If it finds an error, an error code and text will appear in the display window. Other error codes appear when you enter an invalid front-panel setting. For more information on error codes, see the Error Indication section 3.12. When the waveform generator finishes the diagnostic self-test routine, it enters the local state (LOGS) and assumes power-on default settings. Table 3-2 lists the factory default settings. You can program the waveform generator for any settings you want at power on, as described earlier in section 3.6.6. Table 3-2 Power-on Default Settings Key Functions Values Comments FREQUENCY 1.00000000 KHz Wave frequency RATE(ARB) 1 s Sample time per point AMPLITUDE 5.00 V Peak to peak output amplitude FUNCTION SINE Output waveform OFFSET 0.00 V Zero offset REPETITION 10 ms Internal trigger rate MODE CONT Waveform mode N-BURST 2 Waves per burst START ADRS 1 Start memory address WAVELENGTH 1000 Number of points per waveform TRIG SOURCE EXT External trigger source OUTPUT OFF Output disabled SWEEP OFF Sweep execution MODULATION OFF Modulation execution 36 3.11 Memory The waveform generator uses a non-volatile FLASH memory for storing arbitrary waveform data and front panel settings. Up to 400,000 points Arbitrary waveform and 50 front panel settings are stored. These front panel settings can be used to store starting address and lengths of many different waveforms stored in memory as reference points for quick recall. Because it is impossible to guarantee 100% of the time against loss of stored data, you should maintain a record of the data stored in memory so that you can manually restore such data, if necessary. 3.12 Displaying Errors At power-on, the waveform generator performs a diagnostic routine to check itself for problems. If the diagnostic routine finds an error, an error message is displayed. The waveform generator also displays error messages when front-panel settings are either invalid or may produce unexpected results. Error messages for Model 4075and 4078 Message Text Cause Out of range Attempt to set variable out of instrument limits. Setting conflict Cant have this parameter set with some other. Trig rate short Internal trigger rate too short for wave/burst. Empty location Attempt to restore non existent setting. SCALE too high Attempt to set scale too high for current dot value Protected RAM Attempt to write to protected RAM range. Save RAM New firmware installed. Must divide by 4 Predefined wave length must be divisible by 4. Must divide by 2 Predefined wave length must be divisible by 2. 3.13 Using The Model 4075 and 4078 This section explains how to generate various waveforms and modify the output waveforms. 3.13.1 Selecting a Standard Waveform You can select several standard waveforms as: sine, triangle and square. Creating a standard waveform requires selecting the waveform type, parameters, modes, etc., and their settings that define the waveform. Generating a standard waveform requires the following: 37 * Selecting the waveform by pushing any of the waveform buttons (Sine, Ramp, Square, Pulse, or Arb) * Setting the output frequency by using the rotary input knob or numeric keypad to enter the desired frequency. * Setting the output amplitude and offset by selecting the option in the function menu and using the rotary input knob or numeric keyboard to enter the desired amplitude and/or offset. 3.13.2 Setting the Output Mode To set the output mode: 1. Press MODE to display the Mode menu on the display window. 2. Press the function key (Fl to F4) that corresponds to the desired mode. Choose from Continuous, Trigger, Burst, and Gate mode. You can also adjust the Phase in the same menu. 3.13.3 Setting the Output To set the output channel, press the Output ON key. An internal LED is illuminated to indicate that the Output is ON. 3.14 Examples 3.14.1 Creating an Arbitrary Waveform You can create an arbitrary waveform using the following methods: * Enter individual data points * Draw lines between data points * Create a predefined waveform * Export waveform from software * Create data points using SCPI commands * Combine any of these methods The waveforms frequency and amplitude are influenced by the number of data points and their value in the waveform. For further information on how the number of data points influence the frequency and amplitude of a waveform in execution memory, see Setting the Frequency portion (Section 3.14.3) and Setting the Amplitude portion (Section 3.14.4), respectively. 3.14.2 Entering Individual Data Points The most basic way to program an arbitrary waveform is to enter data points for the waveform, one data point at