Marconi NOISECOM NC6107 电路图.pdf

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1、 v v ti jI, ;t - ,.oJ .,Ii .,.J v t ) SiN: 9613 DATE: Jun 1994 (.,.J r.,.i NOISE GENERATING INSTRUMENT NC610 USER MANUAL Noise Com, Inc. Paramus, NJ 07652 (201)261-8797 2ND Copy RadioFans.CN 收音机爱 好者资料库 CONTENTS SPECIAL INSTRUCTIONS SPECIFICATIONS PARTS LIST OPERATION DBSCRIPTION BLOCK D :IAGRAM TBCB

2、NJ:CAL REFERENCE CALIBRATION j;J rev.97jan NOISE COM, INC. Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Pages 7 - 10 Page 11 Page 1.2 RadioFans.CN 收音机爱 好者资料库 INSTRUCTIONSh SPECIAL SBL.BCTIoN OF L:IHI VOLTAGE AND PUSES 1. Remove Power Cord. 2. Open access door to power entry module with a small :; . . s

3、crewdrJ. ver. : ; ;:!.:; i 3. Pull fuse carrier out. Replace fuse with required one. i; ; (:Puse size marked on rear panel) . ,:; . . . 4. Pull voltage select wheel out and rotate until correct voltage appears in the window when access door is closed. ,. (DO NOT attempt to rotate wheel in place.) S.

4、 Replace fuse carrier into right hand side slot (this is the only active side) with the white arrow facing to the right. Close access door. THIS mSTRCMBNT IS SUPPLIED WITH A !CSB JOR TIm VOLTAGE SELEClBD NOISE COM,INC. RadioFans.CN 收音机爱 好者资料库 2. SPECIFICATIONS: - FREQUENCY RANGE NOISE OUTPUT POWER N

5、OMINAL IMPEDANCE OUTPUT CONNECTOR FLATNESS STORAGE TEMPERATURE OPERATING TEMPERATURE RELATIVE HUMIDITY NOISE ATTENUATION POWER REQUIREMENTS POWER DISSIPATION SIZE WEIGHT RE-CAL I BRAT ION. . i ti NOISE COM, INC. 100 Hz - 100 MHz : 20 mW 50 Ohms . . : BNC (F) :+/ 1.0 dB -O_, to +85 Degrees C -10 to +

6、60 Degrees C 95 peIcent 110 dB 120 VAC Less than 10 Watts 8.6 x 5.2 x 12.5 14 Lbs Max. 1 Year . . . . : . . . . : . . : . . . . PERIOD : o.J 3. PARTS LIST - TYPE POWER SUPPLY NOISE SOURCE ATTENUATOR t1 (1 dB/Step) ATTENUATOR 12 (10 dB/Step) SWITCH LENS SWITCH LAMP FUSE AC RECEPTACLE/EMI FILTER LINE

7、CORD OUTPUT CONNECTOR v 1; .,.J ; .I NOISE COM, INC. PART NUMBER HB-28-1.0 NC6107A SOR-019 50R-043 31-951.9 31-963.1 0.75 Amp 6EDL4 17250 BNC (F) h QPERATION The NC6000 series is all solid state noise instrument. When the unit is turned on, it gaussian noise over the full band specified The front pa

8、nel attenuator allows adjustment of the noise output in 1 dB steps. (0.1 dB steps if your instrument is ordered with this .option). Termination of the output is non-critical; the instrument will tolerate any VSWR. NOISE COM, INC. generating supplies, white in section 2. 4 5. DESCRIPTION- The NC 6000

9、 series is an all solid state instrument in which noise is generated by means of a semiconductor noise diode. The diodes output is then amplified to the instrument output level. All amplification is accomplished by means of linear stages, operated to allow white gaussian noise output. The instrument

10、 enclosure is of rugged design. The panels are made of diecast aluminum. Structural integrity is assured by means of internal support which include pull down feet. The circuit (see block diagram) consists of module powered by means of a lightly loaded The noise power goes to a step attenuator(s) rea

11、ching the output connector. NOISE COM, INC. side beams the noise power supply. before 5 i ! ! ; . c t- w:) (/)0. -t- o:) Zo u 0 N 5 CI) I 0 Z 7- TECBNI CAL REFERENCE Noise plays an important role in the RF and Microwave environment because it is virtually a universal test signal. Noise is produced b

12、y random fluctuations of electrons traveling through a resistor, and the average power and amplitude of the noisenoise power) is proportional to the temperature of the resistor. Noise diodes are used to produce noise levels above thermal noise. This thermal noise is white and may have a Gaussian amp

13、litude distribution. Noise/Coms noise diodes are manufactured and screened for performance characteristics that make them useable for broadband noise generation with flat response. All Noise/Com diodes deliver symetrical White Gaussian Noise and flat output power density over the specified frequency

14、 range. Each diode is burned-in for 168 hrs., meets MIL-STD-202, and is hermetically sealed. Noise/Com diodes are available in a wide variety of package styles, frequencies, and in special configurations upon request. NOISE COM, INC. NOISE: What Is It ? 7 NOISE: Where and How is it used? Noise can b

15、e used to systems and can be applied to a variety of measurement applications. It is used to evaluate the performance of ! communications systems, for EMI testing, as a source for built-in test equipment (BITE), and for secure communications systems. Noise can also be used in military jamming system

16、s to confuse enemy radar or communications, and in threat- simulation systems to imitate signals from enemy transmitters. In a radar, noise can obscure returns from an enemy target, and limit the effective range of the radar. In digital communications, excessive noise can cause a high Bit-Error Rate

17、 (BER) , resulting in the transmission and reception of false information. By using noise as a test signal, systems can be evaluated for dynamic range and sensitivity, and calibrated for maximum performance. NOISE COM,INC. both components andcharacterize 8 Noise Factor is def by a receiving system!.

18、 .,.J Noise Factor- ,.,.I Noise Figure is the most widely measured noise parameter. It is defined as 10 x log(noise factor). An ideal receiver would be capable of detecting a signal at -174 dBm/Hz at room temperature, and would have no additive noise. Its noise figure would therefore be 0 dB. It is

19、desirable to maintain the lowest possible noise figure so that the transmitted power can be minimized. Y-factor method is the ratio of resultant noise powers at the output of DUT (device under test) when applying two known levels of noise to the input. It is used with calibrated input noise levels t

20、o calculate noise figure or effective input noise temperature. ,. INC.NOISE COM, NOISE PARAMETERS DEFINED ed as the additive noise producedin Signal-to-noise ratio at input Signal-to-noise ratio at output - ENR (Excess Noise Ratio) is the ratio of the output noise power relative to thermal noise of

21、the termination at 290K. It is given by: T1 - TO ENR(dB) - 10 x log TO where T1 is the effective noise temperature of the energized noise source, and TO is the reference termination at 290 K. The power spectral density of white noise is constant over frequency. This implies that noise power is propo

22、rtional to bandwidth. Therefore, if the measurement bandwidth is doubled, the detected noise power will double (an increase of 3 dB). Noise voltage increases as the square root of bandwidth. For this reason, noise is usually described in dBm/Hz or Voltage over sqr root of frequency. The Total power

23、in a measurement bandwidth (BW) is; . . ;tl ? P(dBm in SO Ohms systems; 10 log(P)= 20 NOISE COM, INC. (dBm/Hz) + 10 log (BW) . Noise VxV (rms) . x 1000 (SO) P(milliwatt 1;00,0 log (Vrms) + 10 log SO + 13 P(dBm) . 20 log (Vrms ) 10- h CALIBRATION .i. SERVICE Noise Com, Inc. certifies that its product

24、s meet published specifications at the time of shipment from the factory. Noise Com, Inc. further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the institutes calibration facility, and to the ca

25、libration facilities of other International Standards Organization members. Your Noise Generating Instrument should be returned to Noise Com, Inc. periodically for adjustment and calibration. One year after purchase, and at least once a year thereafter is highly recommended to re-assure your instrum

26、ents accuracy. Your instrument is shipped back to you calibrated, usually the same day it is received by our Calibration Laboratories. Favorable 3-years Calibration Service Contracts are available. For further information, * * * Ca11 Noise Com, rnc. Your Nose Generating Instrument may be returned to

27、 Noise service.for Com, Inc. (201) 261-8797 for details. NOISE COM, INC. at (201) 261-8797 * * * sending, please call us atPriorto 11 h WARRANTY All Noise Com products are warranted against defects in materials and workmanship for a period of one year from the date of shipment. Noise Com, Inc. will,

28、 at its option, repair or replace products that prove to be defective during the warranty period, provided they are returned to Noise Com. Repairs necessitated by misuse of the product are not covered by this warranty. NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. NOISE COM IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES. NOISE COM,INC. 1.2-