BK PRECISION 2630 manual 电路图.pdf

《BK PRECISION 2630 manual 电路图.pdf》由会员分享，可在线阅读，更多相关《BK PRECISION 2630 manual 电路图.pdf（28页珍藏版）》请在收音机爱好者资料库上搜索。

1、INSTRUCTION MANUAL SPECTRUM ANALYZERS MODELS 2165A 2620A 2625 2630 RadioFans.CN 收音机爱 好者资料库 2 TEST INSTRUMENT SAFETY Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must sometimes be performed where exposed voltage is present. An electrical

2、 shock causing 10 milliamps of current to pass through the heart will 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 s

3、uch voltage can more easily produce a lethal current. Your normal work habits should include all accepted practices to prevent contact with exposed high voltage, and to steer current away from your heart in case of accidental contact with a high voltage. You will significantly reduce the risk factor

4、 if you know and observe the following safety precautions: 5. 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. 6. If possible, famil

5、iarize yourself with the equipment being tested and the location of its high voltage points. However, remember that high voltage may appear at unexpected points in defective equipment. 7. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on wh

6、ich to place equipment; and make certain such surfaces are not damp or wet. 8. Use the time proven “one hand in the pocket” technique while handling an instrument probe. Be particularly careful to avoid contacting a nearby metal object that could provide a good ground return path. 9. When testing ac

7、 powered equipment, remember that ac line voltage is usually present on some power input circuits such as the on-off switch, fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the equipment is turned off. 1. Some equipment with a two-wire ac power cord, inclu

8、ding some with polarized power plugs, is the “hot chassis” type. This includes most recent television receivers and audio equipment. A plastic or wooden cabinet insulates the chassis to protect the customer. When the cabinet is removed for servicing, a serious shock hazard exists if the chassis is t

9、ouched. Not only does this present a dangerous shock hazard, but damage to test instruments or the equipment under test may result from connecting the ground lead of most test instruments to a “hot chassis”. To test “hot chassis” equipment, always connect an isolation transformer between the ac outl

10、et and the equipment under test. The B+K Precision Model TR-110 Isolation Transformer, or Model 1653A or 1655A AC Power Supply is suitable for most applications. To be on the safe side, treat all two-wire ac equipment as “hot-chassis” unless you are sure it has an isolated chassis or an earth ground

11、 chassis. 2. On test instruments or any equipment with a 3-wire ac power plug, use only a 3-wire outlet. This is a safety feature to keep the housing or other exposed elements at earth ground. 3. B+K Precision products are not authorized for use in any application involving direct contact between ou

12、r product and the human body, or for use as a critical component in a life support device or system. Here, “direct contact” refers to any connection from or to our equipment via any cabling or switching means. A “critical component” is any component of a life support device or system whose failure t

13、o perform can be reasonably expected to cause failure of that device or system, or to affect its safety or effectiveness. 4. Never work alone. Someone should be nearby to render aid if necessary. Training in CPR (cardio- pulmonary resuscitation) first aid is highly recommended. RadioFans.CN 收音机爱 好者资

14、料库 3 Instruction Manual for Models 2615A, 2620A, 2625, 2630 SPECTRUM ANALYZERS RadioFans.CN 收音机爱 好者资料库 4 TABLE OF CONTENTS Page TEST INSTRUMENT SAFETY .Inside front cover SPECIFICATIONS.5 OPTIONAL ACCESSORIES .6 GENERAL INFORMATION.7 Symbols .7 Tilt handle.7 Safety.7 Operating Conditions.8 Maintenan

15、ce.8 Selecting the Line Voltage.8 INTRODUCTION.9 General .9 Operating Considerations .9 CONTROLS AND INDICATORS.10 CALIBRATION.15 Vertical Calibration.15 Horizontal Calibration.15 Page INTRODUCTION TO SPECTRUM ANALYSIS. 17 General . 17 Types of Spectrum Analyzers. 17 Spectrum Analyzer Requirements.

16、18 Frequency Measurements . 18 Resolution. 18 Sensitivity. 19 Video Filtering. 19 Spectrum Analyzer Sensitivity. 19 Frequency Response. 20 Tracking Generators. 20 APPENDIXdBm CONVERSION . 22 CUSTOMER SUPPORT. 23 INSTRUMENT REPAIR SERVICE . 23 WARRANTY SERVICE INSTRUCTIONS. 24 LIMITED ONE-YEAR WARRAN

17、TY. 25 5 SPECIFICATIONS NOTE: Specifications and information are subject to change without notice. Please visit for the most current product information. Frequency Frequency range: 0.15 MHz to 1050 MHz (3 dB) (Models 2625 and 2630) 0.15 MHz to 500 MHz (3 dB) (Models 2615A and 2620A) Center frequency

18、 display accuracy: 100 kHz Marker accuracy: (0.1% span + 100 kHz) Frequency display resolution: 100 kHz (4 digit LED for Models 2625 and 2630) (4 digit LED for Models 2615A and 2620A) Frequency scanwidth: 100 kHz/div. to 100 MHz/div. (Models 2625 and 2630) in 1-2-5 steps and 0 Hz/div. (Zero Scan) 50

19、 kHz/div. to 50 MHz/div. (Models 2615A and 2620A) in 1-2-5 steps and 0 Hz/div. (Zero Scan) Frequency scanwidth accuracy: 10% Frequency stability: Drift: 150 kHz / hour IF-Bandwidth (3 dB): Resolution: 400 kHz and 20 kHz (Models 2625 and 2630) Resolution: 250 kHz and 20 kHz (Models 2615A and 2620A) V

20、ideo-Filter on: 4 kHz Sweep rate: 43 Hz Amplitude Amplitude range: 100 dBm to +13 dBm Screen display range: 80 dB (10 dB / div.) Reference level: 27 dBm to +13 dBm (in 10 dB steps) Reference level accuracy: 2 dB Average noise level: 99 dBm (20 kHz BW) (Models 2625 and 2630) 99 dBm (20 kHz BW) (Model

21、s 2615A and 2620A) Distortion: 3 MHz apart) Sensitivity: dB above average noise level Log scale fidelity: 2 dB (without attn.) Ref.: 250 MHz IF gain: 10 dB adjustment range Input Input impedance: 50? Input connector: BNC Input attenuator: 0 to 40 dB (4 x 10 dB steps) Input attenuator accuracy: 1 dB/

22、10 dB step Max. input level: +10 dBm, 25VDC (0 dB attenuation) +20 dBm (40 dB attenuation) Tracking Generator (Models 2620A and 2630 only) Output level range: 50 dBm to +1 dBm (in 10 dB steps and variable) Output attenuator: 0 to 40 dB (4 x 10 dB steps) Output attenuator accuracy: l dB Output impeda

23、nce: 50? (BNC) Frequency range: 0.15 MHz to 1050 MHz (Model 2630) 0.1 MHz to 500 MHz (Model 2620A) Frequency response: 1.5 dB Radio Frequency Interference (RFI): 16 Ohms can be connected to this output. When tuning the spectrum analyzer to a spectral line possibly available audio signals can be dete

24、cted. The signal is provided by an AM-Demodulator in the IF-section. It demodulates any available AM-Signal and provides as well one-side FM- Demodulation. The output is short circuit proof. 18. VOLUME. Volume setting for earphone output. 19. PROBE POWER. The output provides a +5 Vdc voltage for the

25、 operation of an PR-261 near field sniffer probe. It is only provided for this purpose and requires a special cable which is shipped along with the PR-261 probe set. 14 CONTROLS AND INDICATORS TRACKING GENERATOR CONTROLS (Models 2620A and 2630) 23. ATTN. (ATTENUATOR). Output level attenuator with fo

26、ur 10 dB attenuators which allow the signal to be reduced prior to reaching the OUTPUT jack. The four attenuators are equal and each is activated by depressing the button. When engaged, each provides a 10 dB attenuation. Any combination of buttons may be used to achieve the desired attenuation. 24.

27、OUTPUT. 50? BNC output of the tracking generator. 21. TRACK GEN. The tracking generator is activated when this button is engaged. When activated, a sine signal can be obtained at the OUTPUT BNC connector at a frequency determined by the spectrum analyzer. In ZERO SCAN mode, the center frequency appe

28、ars at the output. 22. LEVEL. This knob adjusts the level of the tracking generator. Continuously variable from 10 dBm to +l dBm; operates in conjunction with step attenuators for +1 dBm to 50 dBm output level. 15 CALIBRATION Vertical Calibration (Models 2625 and 2630) Prior to calibration, ensure t

29、hat all input attenuators (14) are released. The spectrum analyzer must be in operation for at least 60 minutes prior to calibration. Switch VIDEO FILTER (11) to OFF position. Set BANDWIDTH (10) to 400 kHz. Set SCANWIDTH (15) to 2 MHz/div. Connect calibrated RF signal of 27 dBm 0.2 dB (10 mV) to the

30、 spectrum analyzer input (13). The frequency of this signal should be between 2 MHz and 250 MHz. Set the center frequency to the signal frequency. A: A single spectral line (27 dBm) appears on the screen. The spectral line maximum is now adjusted with the Y-POS. control (12) and placed at the top gr

31、aticule line of the screen. All input attenuators switches have to be released. The following adjustment is only necessary for service purposes and if the check of this settings shows deviations of the correct settings. The y-ampl. control is located on the XY-PCB inside the instrument. In case any

32、adjustment of the vertical amplification is necessary, please refer to the service manual. B: Next, the generator signal must be switched back and forth between 27 dBm and 77 dBm, and the Y-AMPL. control adjusted so that the spectral line peak changes by 5 divisions in the vertical direction. If thi

33、s results in a change of the Y-position, the calibration outlined under A has to be repeated. The calibrations A and B have to be repeated until an ideal adjustment is achieved. Finally, the operation of the input attenuators (14) can be tested at a level of 27 dBm. The spectral line visible on the

34、screen can be reduced in 4 steps of 10 dB each by activating the attenuators incorporated in the spectrum analyzer. Each 10 dB step corresponds to one graticule division on the screen. The tolerance may not exceed 1 dB in all attenuation positions. Vertical Calibration (Models 2615A and 2620A) Prior

35、 to calibration, ensure that all input attenuators (14) are released. The spectrum analyzer must be in operation for at least 60 minutes prior to calibration. Switch VIDEO FILTER (11) to OFF position. Set BANDWIDTH (10) to 250 kHz. Set SCANWIDTH (15) to 2 MHz/div. Connect calibrated RF signal of 27

36、dBm 0.2 dB (10 mV) to the spectrum analyzer input (13). The frequency of this signal should be between 2 MHz and 250 MHz. Set the center frequency to the signal frequency. A: A single spectral line (27 dBm) appears on the screen. The spectral line maximum is now adjusted with the Y-POS. control (12)

37、 and placed at the top graticule line of the screen. All input attenuators switches have to be released. B: Next, the generator signal must be switched back and forth between 27 dBm and 77 dBm, and the Y-AMPL. control adjusted so that the spectral line peak changes by 5 divisions in the vertical dir

38、ection. If this results in a change of the Y-position, the calibration outlined under A has to be repeated. The calibrations A and B have to be repeated until an ideal adjustment is achieved. Finally, the operation of the input attenuators (14) can be tested at a level of 27 dBm. The spectral line v

39、isible on the screen can be reduced in 4 steps of 10 dB each by activating the attenuators incorporated in the spectrum analyzer. Each 10 dB step corresponds to one graticule division on the screen. The tolerance may not exceed l dB in all attenuation positions. Horizontal Calibration (Models 2625 a

40、nd 2630) Prior to calibration ensure that all input attenuators switches (14) are released. The spectrum analyzer must be operated for at least 60 minutes prior to calibration. The VIDEO FILTER push button (11) must be in OFF position. Set BANDWIDTH (10) to 400 kHz. Set the SCANWIDTH (15) to 50 MHz/

41、div. After the center frequency is set to 250 MHz, a generator signal must be applied to the input. The output level should be between 40 and 50 dB above the noise. C: Set generator frequency to 250 MHz. Adjust the peak of the 250 MHz spectral line to the horizontal screen center using the X-POS. co

42、ntrol (16). D: Set the generator frequency to 50 MHz. If the 50 MHz spectral line is not on the second graticule line from left, it should be aligned using the X-AMPL. control (17). Then the calibration as described under C should be verified and corrected if necessary. The calibrations C and D shou

43、ld be repeated until optimum adjustment is achieved. Horizontal Calibration (Models 2615A and 2620A) Prior to calibration ensure that all input attenuators switches (14) are released. The spectrum analyzer must be operated for at least 60 minutes prior to calibration. The VIDEO FILTER push button (11) must be in OFF position. 16 CALIBRATION Set BANDWIDTH (10) to 250 kHz. Set the SCANWIDTH (15) to 50 MHz/div. After the cent