BK_3010 电路图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 TEST INSTRUMENT SAFETY WARNING Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must often be performed where exposed voltage is present. An electrical shock causing 10 miliamps of current to pass through the heart w

2、ill stop most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous and hazardous since it can produce a lethal current under certain conditions. Higher voltages pose an even greater threat because such voltage can more easily produce a lethal current. Your normal

3、work habitis should include all ac- cepted practices that will prevent contact with exposed high voltage. and that will steer current away from your heart is case of accidental contact with a high voltage. You will significantly reduce the risk factor is you know and observe the following safety pre

4、cautions: Dont expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making test connections in high-voltage circuits. Discharge high- voltage capacitors after removing power. 2. Use an insulated floor material or a large, insulated floor mat to sta

5、nd on, and an insulated work surface on which to place equipment; and make certain- such surfaces are not damp or wet. Where insulated floor surface is not available, wear heavy gloves. 3. Use the time-proven one hand in the pocket technique while handling an instrument probe. Be particularly carefu

6、l to avoid contacting a nearby metal object that could provide a good ground return path. Always use an isolation transformer to power transformerless hot chassis equipment, where one side of the ac power line is connected directly to the chassis. This includes most re- cent television sets and audi

7、o equipment. Without an isolation transformer, the chassis of such equipment may be floating at line voltage (120 V AC, 60 Hz in USA), depending upon which way the 2-wire ac power plug is inserted. Not only does this present a dangerous shock hazard if the chassis is touched, but damage to test inst

8、ruments or the equipment under test may result from connecting the ground lead of some test instruments to a hot chassis. The ground lead of this function generator and most other test instruments with 3-wire power plugs is at earth ground. S. On test instruments or any equipment with a 3-wire ac po

9、wer plug, use only a 3-wire outlet. This is a safety feature to keep the housing or other exposed elements at earth ground. 6. If possible, familiarize yourself with the equipment being tested and the location of its high votage points. However, remember that high voltage may appear at unexpected po

10、ints in defective equipment. 7. Also remember that ac line voltage is present on some power input current points such as on. off switches, fuses, power transformers, etc., even when the equipment is turned off. 8. Never work alone. Someone should be nearby to render aid if necessary. Training on CPR

11、 (cardo-pulmonary resuscitation) first aid is highly recommended. RadioFans.CN 收音机爱 好者资料库 FOR . .6460 W. Cortland Street Chicago, Illinois 60635 RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS PAGE 3 3 5 8 9 10 12 13 13 13 16 18 18 2021 22 23 23 25 27 31 32 36 3738 INTRODUCTION SPECIFICATIONS. PANEL CONTR

12、OLS AND FEATURES. OPERATING INSTRUCTIONS A. Frequency and Waveform Selection, Manual Operation B. DC Output. C. Voltage-Controlled Operation. D.TTLOutput APPliCATIONS A. Amplifier Frequency Response. B. Tone Control Test. .C. Amplifier Overload Characteristic. D. Amplifier Performance Evaluation Usi

13、ng Square Waves E.SpeakerSystemTesting F.AMReceiverAlignment G. Using the 3010 As A Bias and Signal Source. H. Preset Frequency Selection. I. Digital Frequency Selection. J. Communications Receiver Alignment. K.AdditionalApplications THEORY OF OPERATION GeneralCircuitDescription Detailed Circuit Des

14、cription. MAINTENANCE AND CALIBRATION Removal of Rear Case Calibration Procedure LineVoltageConversion WARRANTY SERVICE INSTRUCTIONS. ONE-YEAR liMITED WARRANTY. - INTRODUCTION The B greater than 100: 1 on any frequency range (linear). With FREQUENCY dial set at .1, a 0-to-5.5 V ramp input will produ

15、ce a 100:1 fre- quency change. Frequency increases with positive voltage. :!:20 V peak.Maximum Input Input Impedance 1000 ohms, nominal. SPECIFICAnONS (AU specifications apply with dial scale between 1 and 10) Dial Accuracy5% of full scale to 500 kHz, 8% of full scale from 500 kHz to 1 MHz (includes

16、 dial scale accuracy and range-to-range accuracy). Unit calibrated at full scale. Dial RangeGreater than 100: 1, 600.Q, :1:5%. Output Impedance Output Amplitude 20 V pop open circuit; 10 V pop into 600il. Amplitude ControlContinuously variable, greater than 30 dB range. 3 DC OffsetContinuously varia

17、ble, :tIO V, open circuit; :tS V, into 600Q. Max. V AC + Voc offset without clipping, :1:10 V open circuit; :1:5 V into 600il. Sine Wave DistortionLess than 1%, 1 Hz to 100 kHz; hannonics more than 30 dB down from fundamental, 100 KHz to 1 MHz. Less than 1 %, to 100KHz. Square Wave Non-Symmetry Tria

18、ngle Wave Non-linearity Less than 1%, to 100 KHz. Square Wave Rise/Fall Timeless than 100 nSEC at maximum output amplitude. Sine Wave Amplitude flatness:1:.3 dB to 1 MHz at maximum output amplitude. TTL Square Wave Response Less than 25 nSEC rise/fall time. Fixed TTL level: LO less than .4 V; III gr

19、eater than 2.4 V. Will drive 20 TTL loads. Short-Term Stability .05% Power Requirements Dimensions (HWD) 105 to 130 V AC, 60 Hz. 8 watts max. (105-130/210-260 VAC, 50/60 Hz export version available) 3.2 x 11.3 x 7.7 (8.13x28.70 x 19.56 cm.) Weight 21bs.,9 oz. (1.16 Kg.) without line cord. 21bs., 14

20、oz. (1.31 Kg.) with line cord. HandleFour positions: integral part of case. 4 PANEL CONTROLS AND FEATURES (See Fig. 1) 1. POWER on-off switch. Depressing this button turns the 3010 on. To turn off, push again and release. 2. RANGE selectors. Decade frequency type. Multiplying the range selected time

21、s the FREQUENCY dial (6) indication gives the output frequency, which applies for all functions. For example, if the 100 K RANGE button is depressed and the FREQUENCY dial is at 10, the output frequency is 1 MHz. 3. FUNCTION selectors. Select square (IUU), sine (,), or triangle () output waveform wh

22、ich appears at 600n OUTPUT jack (9). 4. AMPliTUDE control. Controls the amplitude of the output signal, which appears at 600n jack (9). This control does not apply to the DC OFFSET voltage or to the TTL output. S. DC OFFSET control. Adds positive or negative DC component to the signal appearing at 6

23、00n OUTPUT jack (9). Continuously variable for :!:S V (600 ohms) or :!:10 V (open circuit). The DC component added by this control is dependent of the adjustment of AMPLITUDE control (4). 6. FREQUENCY dial. Multiplying the setting of this dial times the frequency of the RANGE switch (2) selected giv

24、es the output frequency of the waveforms at the 600n OUTPUT jack (9) and TTL jack (7). 7. TIL jack. A TIL square wave is available at this jack. The frequency is determined by the RANGE selected and the setting of the FREQUENCY dial. This output is independent of the AMPliTUDE and DC OFFSET controls

25、. 8. -=b(Ground) jack. Common reference for the 1TL and 600n OUTPUT signals. 9. 600Q OUTPUT jack. Waveforms selected by FUNCTION switches as well as the superimposed DC OFFSET voltage are available at this jack. 10. HANDLE. Multiple-position design permits use as a tilt stand or carrying handle. 6 C

26、X) CD, r L!), N (V) +. ,; Ii - jj:B 1119,11 :. :D: .; 0) - 0, - ; rn u E = = = fn 0 = 0 (.) = 0 - ch 11. VCO INPUT jack (rear panel). An external voltage input will vary the output frequency. The change in frequency is directly proportional to input voltage; therefore, the rate of change of frequenc

27、y is proportional to that of the input voltage. 12. LINE CORD RECEPTACLE (rear panel). This receptacle accepts the detachable line cord. (Fixed power cord on 105-130/210-260 V AC, 50/60 Hz export version.) 1112 Fig. 2. Rear panel. 7 OPERATINGINSTRucnONS A. FREQUENCY AND WAVEFORM SELECTION, MANUAL OP

28、ERA nON With the unit plugged into a power source, depress the POWER button (1). 2. Select the frequency range desired by depressing the appropriate RANGE switch. The frequency range obtained as the FREQUENCY dial (6) is varied will be from one-tenth the indicated RANGE value to 10 times this value.

29、 For example, select the 10 K range. When the FREQUENCY dial is at .1, the output frequency is 1 KHz; when at 1, it is 10KHz and when at 10 the frequency is 100 KHz. The frequency obtained applies to the signal at the lTL jack as well as the 60012 OUTPUT jack. 3.Select the waveform desired by depres

30、sing the appropriate FUNCTION button. The phase relationships of the waveforms available are shown in Fig. 3. 4.The amplitude of the selected output signal at the 60012 OUTPUT jack is adjusted by AMPLITUDE control (4). The TTL output is not affected by the AMPLITUDE control. 5,A DC component can be

31、added to the signal at the 600n OUTPUT jack by use of the DC OFFSET control. The DC component introduced is independent of the AMPLITUDE control and does not apply to the TTL output. The level of DC can be varied :tIO volts open circuited or :tS volts across 600 ohms. Fig. 3. Output waveform and pha

32、se relationships. 8 A. ZERO DC OFFSET WITH MAXIMUM SIGNAL. B. OFFSET LIMITS WITHOUT CLIPPING C. EXCESSIVE OFFSET, -5V .- NEGATIVE DC OFFSET POSITIVE DC OFFSET Fig. 4. Use of DC OFFSET control. 6.Remember that the output signal swing of the generator is limited to :1:10 volts (open circuit) or :1:5 v

33、olts into 600 ohms. This applies to the combined signal and DC offset. Clipping occurs slightly above these levels. Fig. 4 illustrates the various operating conditions encountered, when using the DC offset. If the desired output signal is large or if a large DC offset is used, an oscilloscope should

34、 be used to make sure that the desired combination is obtained without undesirable clipping. 7. When using the higher output frequencies and when using the square wave and TTL outputs, terminate the cable in 600 ohms to minimize ringing. Keep the cables as short as possible. B.DC OUTPUT The DC OFFSE

35、T feature can be used to convert the Model 3010 to a bipolar DC power supply with an internal impedance of about 600 ohms. Depress the FUNCTION switches slightly so that all switches are released (all buttons out). This removes all signal components from the output. 2.The output now consists of a DC

36、 voltage which can be varied continuously from -10 volts to + 1 0 volts (open circuit) by use of the DC OFFSET control. 9 A decoupling capacitor (20 mfd or more) can be connected across the 60012 OUTPUT and ground (-=:!:-) terminals to reduce the AC impedance of the output. Always observe polarity w

37、hen using polarized capacitors. c.VOLTAGE-CONTROLLED OPERAnON The 3010 can be operated as a voltage-controlled oscillator (VCO) by using an external control voltage applied to the VCO IN jack at the rear of the unit. A male phono plug is provided for this purpose. The externally applied voltage will

38、 vary the frequency which is preselected by the RANGE switches and the FREQUENCY dial. A positive-going voltage will increase the frequency and a negative-going voltage will decrease the frequency. Please note that the frequency does not change without limit as the input control voltage is increased

39、. The upper dial frequency can be exceeded by about 10 per cent. If the control voltage reduces the lowest frequency available below the frequency corresponding to the low end of the frequency dial (.1), erratic operation results. The desired frequency, output waveforms, DC offset, and the output am

40、plitud .C8)-1 I II DDDDDDDDDD . 0 0- ;r;:1 Amplifier under test -0 -+-i .0D-1 . AC Voltmeter Output Termination A. TEST SET-UP. B. WAVE SHAPE AND AMPUTUDE. Fig. 5. Amplifier frequency response, manual frequency change. 14 . .111. I-u=J -u .101 . L1J II) 1 Z +51 0 Do I ffi 0 a: L1J -5 ij - L1J -10 a:

41、 In +. -a W (/) +5 (/) 0 w w - I -10 +201 .20 -20.1 Fig. 7. Tone control effectiveness. Fig. 6. Plot of amplifier frequency response. FREQUENCY, Hz FREQUENCY. Hz 15 Input Waveform Output Waveform Fig. 8. Amplifier overload characteristics. D. AMPliFIER PERFORMANCE EV ALUAnON USING SQUARE WA YES The

42、standard sine-wave frequency response curves, such as those obtained in Par. A, do not give a full evaluation of the amplifier transient response. The square wave, because of the high harmonic content, yields much information regarding amplifier performance, when used in conjunction with an oscillo-

43、 scope. Use the test set.up of Fig. 9 A. This is that a termination is specified at the; using square waves to eliminate the rise times. Using the triangle output of the 3010, set the AMPliTUDE control so that there is no signal clipping over the range of frequencies to be used. 2. Select the square

44、 wave output and adjust the frequency to several check points within the passband of the amplifier, such as 20 Hz, 1000 Hz and 10 KHz. At each frequency check point the wave form obtained at the amplifier output provides information regarding amplifier performance with respect to the frequency of th

45、e square wave input. Fig. 9B indicates the possible wave forms obtained at the amplifier output and the causes. 4. Square wave evaluation is not practical for narrow band amplifiers. The restricted band width of the amplifier cannot reproduce all frequency 16 similar to that used in Fig. SA except !

46、mplifier input. This is essential when ringing effects generated by the fast components of the square wave in the proper phase and amplitude relation- ships. Dual Trace Oscilloscope preferred rNo DC Offset 1111 -Square wave selected Amplifier under test 0-1- -0 -t TerminationOutput I A. TEST SET-UP.

47、 B. TEST WAVEFORMS. Fig. 9. Amplifier performance evaluation, using square waves. 17 8 . 8- 8- ;:m.rn.- . I SPEAKER SYSTEM TESnNGE. The 3010 can be used to provide information regarding the input impedance of speaker systems vs. frequency. In addition, the low-frequency resonance of the system can b

48、e determined. Because the Model 3010 output impedance is 600 ohms, which is much higher than the impedance of conventional speaker systems, the 3010 can be used as a variable .frequency current source to evaluate the input impedance of.the speaker system. This is shown in Fig. lOB. 1Use the test set

49、-up Fig. lOA. An oscilloscope could be used in this set-up to verify that the 3010 is not being operated in a clipping condition. Vary the frequency of the 3010 over the full range of interest and log the voltage measured at the speaker terminals vs. frequency. The dB scales of the AC voltmeter are convenient for converting this information to standard response units. 2. It will be observed that at some low frequency, a pronounced increase in voltage will occur. This is th resonance frequency of the low-frequency driver in