BK PRECISION 4086 DDS 电路图.pdf

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1、 Function and Arbitrary/Function Generators Model 4084AWG, 4086AWG, 4084, 4085, 4086, 4087 INSTRUCTION MANUAL 4080 Series RadioFans.CN 收音机爱 好者资料库 4080 series Arbitrary/Function Generator with Counter Instruction Manual 2 Safety Summary The following safety precautions apply to both operating and mai

2、ntenance personnel and must be observed during all phases of operation, service, and repair of this instrument. Before applying power, follow the installation instructions and become familiar with the operating instructions for this instrument. Failure to comply with these precautions or with specif

3、ic warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. B When the start frequency is higher than stop frequency, the frequency sweep decreases gradually from the start frequency (high frequency) to stop frequency (low frequency). 40

4、80 series Arbitrary/Function Generator with Counter Instruction Manual 25 The frequency range from start frequency to stop frequency is 1Hz Fmax in linear sweep mode and 1mHz Fmax in log sweep mode. (Fmax see specification section for main waveform) Sweep time “TIME” The time needed to complete one

5、sweep from start to stop frequency is called sweep time. The sweep time range is 1ms 800s in linear sweep mode or 100ms 800s in LOG sweep mode. Trigger mode “TRIG”: A sweep can be triggered internally or externally. The corresponding display values are “1: INT” and “2: EXT”. The default value is INT

6、ernal trigger. In internal trigger mode, the instrument will continuously sweeps from the start frequency to the stop frequency according to the Sweep parameters. An external trigger signal can be generated in one of two ways. a) Press the 【output】 key to trigger a single sweep. The signal frequency

7、 will in/decrease from start frequency to stop frequency, then sweep will stop. b) Apply an input trigger signal to the “EXT Trig” terminal on the rear panel. A rising edge will trigger a single sweep. In external trigger mode, symbols “Trig” and “Ext” are displayed in the status field. Start and st

8、op of sweep The sweep will start automatically once sweep mode is selected. If you dont want to output the sweep signal, simply press the 【output】key to disable the signal output (LED above Output button is OFF). Once all the parameters are set, you can make the sweep signal available at the output

9、by pressing the Output button again. In external trigger mode, the 【Output】key functions only as a single pulse trigger key, the Output On/Off functionality is now disabled and the output LED will always be lit. Sweep configuration example Sweep parameters are as followed: Frequency range 100Hz200kH

10、z, sweep time 10s, linear sweep, internal trigger mode. Set the carrier frequency parameters Press【sweep】 Press【menu】 Select “MODE”, wait, then enter【1】 【N】(linear sweep) Press【menu】to select “START F”, press【1】 【0】 【0】 【Hz】 Press【menu】to select “STOP F”, press【2】 【0】 【0】 【kHz】 Press【menu】to select

11、“TIME, press【1】 【0】 【s】 Press【menu】 to select “TRIG”, press【1】 【N】 Hint: The frequency displayed immediately after pressing Sweep is the start frequency. Any changes to that value will automatically update parameter “START F” 4080 series Arbitrary/Function Generator with Counter Instruction Manual 2

12、6 FM DEVIA FM FREQ FM WAVE FM SOURCE 4.6.2 FM modulation A modulated waveform consists of a carrier waveform and a modulating waveform. In FM, the frequency of the carrier is varied by the amplitude of the modulating waveform. The function generator will accept an internal or external FM modulating

13、signal. Press the 【FM】key to enter into FM mode. The display will indicate the carrier frequency and the “FM” annunciator will be lit. The frequency, amplitude, waveform and DC offset of the carrier signal can be set as described in the previous section. Only the main functions sine or square wave c

14、an be selected as a carrier signal. Press the 【menu】 key repeatedly to cycle through the FM modulation parameters listed below. FM DEVIA Peak frequency deviation FM FREQ: Frequency of modulating signal FM WAVE: Waveform of modulating signal FM SOURCE Toggle between internal or external modulating si

15、gnal Each time you press the menu key, the parameter will flash for 1 second, followed by the value of that parameter. FM modulation parameters can be entered directly or via the knob. Once the parameter is set, press 【menu】 to advance to the next parameter. Peak frequency deviation ”FM DEVIA” Expla

16、nation: The variation in frequency of the modulating waveform from the carrier frequency (center frequency). Range of deviation: For internal FM modulation, the maximum value should not exceed 50% of the carrier frequency. In external FM mode, the maximum deviation is 10% of the carrier frequency. A

17、dditionally, the frequency deviation plus carrier frequency should not exceed the maximum operating frequency of the instrument. (Fc + Fd AM FREQ AM WAVEAM SOURCE modulating signal source “external” is selected, the symbol “Ext” is displayed and parameters FM DEVIA, FM FREQ and FM WAVE do not apply

18、(disabled) Start and stop of FM modulation An FM signal is generated once FM function mode is selected. The instrument will automatically output a signal according to the preset parameters. If you do not want to output the FM signal, simply press the 【output】 key to disable the signal output (LED ab

19、ove Output button is OFF). Once all the parameters are set, you can turn make the FM signal available at the output by pressing the Output button again. FM example: Example configuration: Carrier signal is square, frequency is 1MHz, amplitude is 2V, modulating signal is generated internally. Carrier

20、 waveform is sine (No. 1), Frequency is 5kHz. Peak frequency deviation is 200kHz. Press【FM】 Press【frequency】then【1】 【MHz】 (set carrier frequency) Press【amplitude】, then【2】 【V】 (set carrier amplitude) Press【Shift】and 【square】 (set carrier waveform) Press【menu】, select “FM DEVIA”, enter【2】 【0】 【0】 【kH

21、z】 (set FM deviation) Press【menu】, select “FM FREQ”, press【5】 【kHz】 (set FM frequency) Press【menu】, select “FM WAVE, press【1】 【N】 (set FM waveform as sine) Press【menu】, select “FM SOURCE”, press【1】 【N】 (set FM source as internal) 4.6.3 AM modulation AM stands for amplitude modulation. Press 【AM】 to

22、enable AM modulation. The carrier frequency and the AM annunciator is displayed. Frequency, amplitude, waveform and DC offset of the carrier signal can be set as described in the previous section of this chapter. The parameters carry over from the parameter settings of the main waveforms sine and sq

23、uare. In AM only sine and square waves can be selected for carrier. Press the 【menu】 key repeatedly to cycle through the AM modulation parameters listed below. AM LEVEL: Modulation depth AM FREQ: Frequency of modulating signal AM WAVE: Waveform of modulating signal AM SOURCE: internal or external mo

24、dulating signal In AM mode, to ensure normal signal output at 100% modulation depth, the instrument reduces the peak-to-peak value of the carrier by 50%. Only sine and square waves can be selected as AM carrier. 4080 series Arbitrary/Function Generator with Counter Instruction Manual 28 Modulation d

25、epth “AM LEVEL”: The range of modulation depth is 1% 120%. Modulating frequency “AM FREQ” Frequency of the modulating signal. Range is 100Hz 20kHz. Parameter does not apply when “AM SOURCE” is set to “EXTernal” Modulating signal waveform “AM WAVE”: Waveforms sine, square, triangle, rising and fallin

26、g ramp can be used as the modulating signal. Waveforms are selected by entering the corresponding number, numbers 1 5. Parameter does not apply when “AM SOURCE” is set to “EXTernal” Modulating signal source “AM SOURCE” Select internal signal and external input signal. The number and prompt symbols a

27、re 1: INT, 2: EXT. The default of the instrument is internal signal. The external modulating signal is input through the rear panel “Modulation Input” terminal (with a maximum signal amplitude of 3Vp-p). Enabling and disabling the AM signal: An AM signal is generated once AM modulation is selected.

28、The instrument will automatically output a signal according to the preset parameters. If you do not want to output the AM signal, simply press the 【output】 key to disable the signal output (LED above Output button is OFF). Once all the parameters are set, you can make the AM signal available at the

29、output by pressing the Output button again. AM example: Configuration: carrier signal is square wave, frequency 1MHz, amplitude 2V, internal signal, modulating waveform sine wave (No.1), modulating signal frequency 5kHz, modulation depth 50%: Press【AM】 (activate AM modulation) Press【frequency】, then

30、【1】 【MHz】 (set carrier frequency) Press【amplitude】, then【2】 【V】 (set carrier amplitude) Press【shift】 then【square】 (set carrier waveform) Press【menu】, select “AM LEVEL”, press【5】 【0】 【N】 (set modulation depth) Press【menu】, select “AM FREQ”, press【5】 【kHz】 (set modulating signal frequency) Press【menu】

31、, select “AM WAVE”, press【1】 【N】 (set AM wave as sine) Press【menu】 select “AM SOURCE”, press【1】 【N】 (set AM source to internal) 4.6.4 Burst modulation You can configure the function generator to output a waveform with a specified number of cycles, called a burst. You can output the burst at a rate d

32、etermined by the internal rate generator or an external signal applied to the rear-panel connector. The function generator can produce a burst using sine or square waveforms. Press【Burst】to enter into burst mode. The carrier frequency and the Burst annunciator are displayed. Frequency, amplitude, wa

33、veform and DC offset of the carrier signal can be set as 4080 series Arbitrary/Function Generator with Counter Instruction Manual 29 TRIG COUNT SPACE T PHASE described in the previous section of this chapter. The parameters carry over from the parameter settings of the main waveforms sine and square

34、. Press the 【menu】 key repeatedly to cycle through the burst menu parameters listed below. TRIG: Trigger source COUNT: Number of cycles SPACE T: Burst time spacing PHASE: The starting phase of the burst Select trigger source “TRIG” Three trigger sources are available. Internal trigger and 2 types of

35、 external triggers sources, external gated and single. The corresponding menu parameters are 1: INT, 2: EXT and 3: SINGLE. The default is internal triggering. a) Internal trigger When the internal trigger source is selected, the frequency at which the burst is generated depends on parameter SPACE_T,

36、 burst count and the burst carrier frequency. b) Single trigger mode Generate a single trigger event by pushing the 【output】key once or by applying a single TTL pulse at the “Ext.Trig” input terminal in the rear panel. A single burst with predefined parameters will be generated. c) External gated bu

37、rst mode The TTL signal applied to “Ext. Trig” input terminal in the rear panel will enable or disable the output of the generator. When the TTL level of the gate signal is high, the generated will generate burst pulses according to the parameters of the set carrier frequency. Burst parameters COUNT

38、 and SPACE_T are ignored in this mode. Anunciators “Trig” and “Ext” turn on when this mode is active. Burst count “COUNT”: Definition: The number of cycles to be output per burst. Range: 1 10000 cycles in 1 cycle increments. Additionally, the minimum number of cycles must also satisfy FC/50khz +1。Pa

39、rameter does not apply when “TRIG” is set to “EXTernal”. Burst spacing time “SPACE T”: Definition: Time interval between the 2 consecutive groups of bursts (time interval during which there is no burst signal present) Parameter does not apply when “TRIG” is set to “EXTernal” or “SINGle”. Range: 0.1m

40、s 800s. Starting phase of the burst “PHASE” Burst phase: 0.0 360.0 in 0.1 increments 4080 series Arbitrary/Function Generator with Counter Instruction Manual 30 START F STOP F SPACE T TRIG Enabling/disabling the burst signal The generator outputs a burst as soon as the burst key is pressed. The inst

41、rument will automatically output a signal according to the preset parameters. If you do not want to output the burst signal, simply press the 【output】 key to disable the signal output (LED above Output button is OFF). Once all the parameters are set, you can make the burst signal available at the ou

42、tput by pressing the Output button again. Note that the output on/off function does not apply when single trigger mode is selected. Burst example: Configuration: Burst is sine wave with frequency 20kHz, amplitude 2V, 10 cycles per group, spacing time between each group 10 ms, start phase 90.0 Press【

43、burst】 (enter into burst mode) Press【frequency】, press【2】 【0】 【kHz】 (set wave form frequency) Press【amplitude】, press【2】 【V】 (set waveform amplitude) Press【shift】and【sine】 (set waveform) Press【menu】, select “TRIG”, press【1】 【N】 (set trigger mode as internal) Press【menu】, select “COUNT”, press【1】 【0】

44、 【N】 (set number of bursts/cycles) Press【menu】, select “SPACE T”, press【1】 【0】 【ms】 (set space time) Press【menu】, select “PHASE”, press【9】 【0】 【N】 (set the start phase of burst) 4.6.5 FSK modulation You can configure the function generator to “shift” its output frequency between two preset values us

45、ing FSK modulation. The rate at which the output shifts between the two frequencies (“carrier frequency” and “hop frequency”) is determined by the internal rate generator or the signal level on the rear-panel ext Trig/FSK/Burst terminal. Press【FSK/PSK 】to enable FSK modulation. A preset frequency an

46、d the FSK annunciator is displayed. The preset frequency is identical to the “START F” parameter. Any changes automatically update “START-F” and vice versa. Frequency, amplitude, waveform and DC offset of the carrier signal can be set as described in the previous section of this chapter. In FSK/PSK

47、only sine and square waves can be selected as carrier wave. Press the 【menu】 key repeatedly to cycle through the FSK menu parameters listed below. START F: First frequency or carrier frequency STOP F: Second frequency (hop frequency) SPACE T: FSK rate TRIG: Trigger source Trigger source “TRIG” Selec

48、t internal signal and external input signal, 1: INT or 2: EXT. The default of the instrument is 4080 series Arbitrary/Function Generator with Counter Instruction Manual 31 P1 P2 SPACE T TRIG “internal”. In internal mode, the rate at which the signal shifts between the carrier and hop frequency is de

49、termined by the FSK rate. In external trigger mode, the trigger signal applied to the trigger input terminal on the rear panel determines the FSK rate. Logical “high” of the trigger signal is associated with frequency 2, while the “Low” level of the trigger signal is associated with frequency 1. Frequency 1 “START F” The first frequency or carrier frequency. Frequency 2 “STOP F” Second frequency or