krohnhite 31A Manual 电路图.pdf

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1、Model 31A 1Hz to 99kHz Elliptical High-Pass Plug-In Filter Card for Model 3905B/3916B Chassis Operating Manual RadioFans.CN 收音机爱 好者资料库 Service and Warranty Krohn-Hite Instruments are designed and manufactured in accordance with sound engineering practices and should give long trouble-free service un

2、der normal operating conditions. If your instrument fails to provide satisfactory service and you are unable to locate the source of trouble, contact our Service Department at (508) 580-1660, giving all the information available concerning the failure. DO NOT return the instrument without our writte

3、n or verbal authorization to do so. After contacting us, we will issue a Return Authorization Number which should be referenced on the packing slip and purchase order. In most cases, we will be able to supply you with the information necessary to repair the instrument, avoiding any transportation pr

4、oblems and costs. When it becomes necessary to return the instrument to the factory, kindly pack it carefully and ship it to us prepaid. All Krohn-Hite products are warranted against defective materials and workmanship. This warranty applies for a period of one year from the date of delivery to the

5、Original Purchaser. Any instrument that is found within the one year warranty period not to meet these standards, will be repaired or replaced. This warranty does not apply to electron tubes, fuses or batteries. No other warranty is expressed or implied. Krohn-Hite Corporation reserves the right to

6、make design changes at any time without incurring any obligation to incorporate these changes in instruments previously purchased. Modifications to this instrument must not be made without the written consent of an authorized employee of Krohn-Hite Corporation. RadioFans.CN 收音机爱 好者资料库 MODEL 31 SERIE

7、S HIGH- PASS ELLIPTICAL PLUG- IN FILTER MODULES MODEL 31-1 : 1Hz to 99kHz MODEL 31-2: a.1Hz to 9.9kHz MODEL 31-3 : O .OlHz to 990Hz OPERATING AND MAINTENANCE MAlTUAL FILTER MO DULES MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SIN MODEL SI

8、N MODEL SIN MODEL SIN MODEL SIN MODEL SIN MAINFRAME MODEL SIN - MICROPROCES SOR MODEL _SIN _ KROHN- RITE CORPORATION 255 Bodwell Street, Avon, MA 02322-9987 Pr int ed 11/90 US A Tel: (50 8)580-1660; Fax: (508)583-8989 RadioFans.CN 收音机爱 好者资料库 Model 31 Table of Contents Table of Conte ts 1.0 GENERAL D

9、ESCRIP110N 1-1 1.1 INTRODUCTION 1-1 1.2 SPECIFICATIONS 1-1 2.0 OPERATION 2-1 2.1 INTRODUCTION 2-1 2.2 TURN-ON PROCEDURE 2-1 2.3 SELF-TEST FEATURE 2-1 2.4 FRONT PANEL CONTROLS and DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.5F1LTER CHARACfERISTICS . . . . . . . . . . . . . .

10、 . . . . . . . . . . . . . . . . . . . . . . 2-2 2.5 .1 INTRODUCTIO N 2-2 2.5.2 1kHz AMPLITUDE R ESPONSE 2-2 2.6 VARIABLE BANDPASSand BAND REJECT OPERATION 2-3 2.7 PHASE RESPONSE 2-4 3.0 IEEE-488 srn (GPID) PROGRAMMING . . . . . . . . . . . . . . . . . . . 3-1 3.1 INTRODUCTION 3-1 3.2FILTER TYPE . .

11、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.3 MODE OF OPERATION 3-1 3.4 DEVICE CLEAR 3-1 4.0 INCOMING ACCEPTANCE . . . . . 4-1 4.1 INTRODUCTION 4-1 4.2TEST EQUIPMENTREQUIRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.3

12、PRE-FILTER AND POST-FILTER GAIN ACCURACY . . . . . . . . . . . . . . . . . . . . . 4-1 4.4 PASSBANDGAIN AND DISTORTION TESTS 4-1 4.4.1 LOW BANDS RIPPLE R ESPONSE 4-2 4.4.2 HIGH BAND RIPPLE RESPONSE (Model 31-1) 4-2 4.4.3 HIGH BAND RIPPLE R ESPONSE (Model 31 -2) 4-2 4.4.4 HIGH BAND RIPPLE RESP ONSE (

13、Model 31-3) 4-3 4.5 STOPBAND ATTENUATION 4-3 4.5.1 BAND 1 4-3 4.5.2 BAND 2 4-3 4.5 .3 BAND 3 4-3 4.5.4 BAND 4 4-3 4.6CUTOFF FREQUENCY ACCURACY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4.7 NOISE MEASUREMENTS 4-4 Table of Contents Model 31 ii o a. Co) . tJ t: CO .:. :J . ;:; C

14、D : o a. t: CD 1lO iT COlPOMTJON l LOW,PASS EllJPllCAl r tL r EI DE I USA c tOKM.z1 R 7J 7 o T DC l !VEl Al)J ODI., R7 UNIT;OAIN OJ I lOO, IN tc IRi 41 70Hl PI AOJ fU . .r NULL AOJ . , 4 .UL.L AOJ R74. 4 7_ HI Pf A AOJ A14.A t J,h (p-iJ ULl ADJ nT . .:Ml UL.L OJ AU 11 PAKAO 11 HI P EAK AOJ . tMH, NU

15、ll AOJ , .t P!AKAOJ -t i NULL.ADJ AI10 :l -8OdB, and a typical passband ripple of 0.22dB peak-to-peak. The Model 31-1covers the range from 1Hz to 99kHz. TheModel 31-2 operates from 0.1Hz to 9.9kHz and from 0.01Hz to 990Hz in the Model 31-3. With its 115dB/octave rolloff rate, The Model 31 provides a

16、 much narrower transition region than an 8-pole Butterworth,and much less passband attenuation ncarcutoff.The transition region from -3dBto-85dBis38% of fc (cutoff), compared to 71% for the 8-pole Butterworth. From -O.3dB to -85.6dB, it becomes 41% of fc compared to 89%. This means the fast transiti

17、on from passband to stopband of the Model 31 makes it the ideal filter for the rejection of interfering signals near the passband. TheModel 31Series is part of an ever expanding line ofplug-in filtercards for use in theModels 3905 and 3916 Mainframes,which accommodates 5 to 16 filter cards respectiv

18、ely. 1.2 SPECIFICATIONS FILTER CHARACTERISTICS Function: High-pass, 7-pole, 6-zero elliptical. Frequency Range fc: Model 31-1: 1Hz to 99kHz. Model 31-2: 0.1Hz to 9.9kHz. Model 31-3: O.OlHz to 990Hz. Reso lution: Model 31-1 Band Frequency Resoluti on 1 1Hz to 99Hz 1Hz 2 100Hz to 990Hz 10Hz 3 1kHz to

19、9.9kHz 100Hz 4 10kHz to 99 kHz 1000Hz Model 31-2 Band Frequency Resolution 1 0.1Hz to 9.9Hz 0.1H z 2 10Hz to 99Hz 1Hz 3 100H z to 990Hz 10Hz 4 1kHz 0 9.9kHz 100Hz Model 31-3 Band Frequency Resolution 1 0,01Hz to 0.99Hz 0.01Hz 2 1Hz to 9.9Hz 0.1Hz 3 10Hz to 99Hz 1Hz 4 100Hz to 990 Hz 10Hz Relative Ga

20、in at fc: -O.22dB at O.99fc nominal. Cutoff Frequency Accuracy: 2%. Bandwidth: fcto upper3dB cutoff, 500kHz at 1Vrrns with OdBgain. Passband Ripple: 0.22dB poptheoretical, OAdB pop max. Att enuation: 115dB/oct ave. Stopband Attenuation: 8OdB. Stopband Frequency (f8) = 0.59fc. 1-1 Section 1 - General

21、 Description Model 31 GAIN Input (prefilter): OdB, lOdB, 2OdB, 3OdB, 4OdB; 0.2dB. Output (postfilter): OdB, lOdB, 2OdB; 0.2dB. INPUT Coupling: ac in Model 31-1; dc in Models 31-2 and 31-3. Impedance: 1 megohm in parallelwith 100pf. Maximum Input: 10Vpeak at OdB gain in Model 31-1. Combined de plus p

22、eak ac should not exceed 10V peak at OdBgain in Models 31-2 and 31-3. Maximum dc Component: l00V in ac coupled mode. OUTP UT Impedance: 50 ohms. Maximum Voltage: lOV peak into 500 Ohms; 3V peak into 50 ohms. Noise: TotalHum and Noise (Ref. toInput, 2MHz Detector Bandwidth) Input Gain (dB) ,. Ga n O

23、ut ut fc , 40 0 10 20 30 (dB) ,. ,0 0 s 1kHz 100J-lVSOOJ-lV 2OOJ-lV 100J-lV 100J-lV 10 20 99kHz 1mV 100flV 500JlV 5Of1V 5Of1V Harmonic Distortion: 8OdB below full scale at 1kHz. Intermodulation Distortion: 8OdB below fullscale volts at 0.7 and 0.9 ofmax input frequency. DC Offset: Adjustable to zero

24、 volts. DC Offset Drift : 25mV at OdBgain; 15C to 40C. Crosstalk Between Channels: 85dB below full scale with input source 8OdB below fullscale with input source 50 ohms. Phase Match Between Channels: 1typical, 2maxfrom 1.3fcto 10fe;2 typical,4 max from feto 1.3fe.For like Models in same chassis, ot

25、herwise consult factory. Amplitude Match Between Channels: O.ldB typical, 0.2dB max from fe to 1.3fc; O.ldB max from 1.3fe to 10kHz, 0.2dB max to 100kHz. POWER: 15 watts. WEIGHT: 1.75 lbs (0.8kg) net. INPUT/OUTPUT CONNECTORS: BNC. Specifications apply at 25C 5C. NOTE: Model31 Series filter cards mus

26、t be used with theModel 3905(A) and 3916(A) Mainframes. 1-2 Model 31 Section 2 - Operation SECTION 2 OPERATION 2.1 INTRODUCTION The Model 31 Series are high-pass plug-in filter modules covering the frequency range from 1Hz to 99kHz (Model 31-1); a.1Hz to 9.9kHz (Model 31-2); a.OlRz to 990Hz (Model 3

27、1-3). It is one of a series of filter modules available for thefivechannelModel 3905 or the sixteenchannel3916Mainframes.All filter parameters are programmable via the Mainframes front panel or remotely over the IEEE-488 (GPIB) bus. For detailed information of the front panel controls and remote pro

28、gramming, refer to Sections 2 and 3 of the Model 3905/3916 Mainframes Operating and Maintenance Manual. Section 2.4 of this manual briefly describes the operation oftheprincipal front panel controls and data key operation. 2.2 TURN- ON PROCEDURE a.The line voltage range oftheModel 3905/3916 Mainfram

29、es has been preset at thefactory for either115V or 230V operation. This range switch is located internally if a line voltage change is required. Check to see that a fuse with the correct rating is in the fuse receptacle. b . Make certain that the POWER switch on the front panel of the unit is in the

30、 off position. c . Plug the line cord into the unit first, then into an ac outl 1. CAUTION For safety purposes, the line cord must be connected to a grounded 3 terminal ac outlet. Because ofpotentially dangerous voltages that exist within the Mainframe, the coversshould beremoved byqualifiedpersonne

31、l. d. If the Model3905/3916 is remotely programmed via theIEEE-488 OPIE, connect the bus cable to therear panel outlet oftheModel 39/39A microprocessor module at this time.Programminginformation isprovided in Section 3 oftheModel 3905/3916 Operating and Maintenance Manual. e. The POWER switch isa to

32、ggle type, located on the front panel ofthe 3905/3916. After familiarizing yourself with the self-test feature described next, turn on the 3905/3916. NOTE Ifthere is a malfunction in the micro processor, such as a def ective RAM or ROM, the sequence will stop and the word bn d will appear in the dis

33、play follo wed by a number from 1 to 3. Refer to Section 7.6, Digital Circuit Maintenance, to find which RAM or ROM is defective. 2.3 SELF- TEST FEATURE When turnedon, the Model 3905/3916 microprocessor performs a Self-Test routine whereby theentireRAM andROM operation are verified. During the test

34、the front panel LEDs and displaywill light up sequentially. WhentheSelf-Test program iscompl ete, the Model 3905/3916 will return to thelast set-up prior to turning off the unit. The Model 3905/3916 is now ready to be programmed for operation. 2- 1 Section 2 - Operation Model 31 2. 4 FRONT PANEL CON

35、TROLS and DISPLAY Data Keys: Dataentry keyboard controls, OJ-9and (.,and associated 4digitdisplayset the numericvalue oftheparameter selected. If a cutoff frequency of105kHzis required, press the 1.5 data keys and parameterkeys KILO and FREQ. Thefrequency will be indicated in the 4 digit display. (M

36、ODE key: Indicates themodeofoperationin the channel displayed, alternating between high-pass, H.P.-land by-pass, bYP.,which connects the input to theoutput.The-1 indicates the suffixofthe filter module Model3l,i.e. H. P.-1 is the Model 31-1. (Type key: Displays EL-7, indicating a 7-pole Elliptical f

37、ilter. Channel: The two channel controls (it 3 J and associated display increment or decrement the channel setting. When held, the Model 3905/3916 willcycle through all thechannelscontinuously.The Model3905 has a 1digit display, the Modcl 3905A has 2 digits. The Model 3916 has a 2 digit display, the

38、 Model 39l6Ahas 3 digits. Gain Set: Input and Output gain is controlled by the two GAI N SET controls it and associated 2 digit displays in lOdB steps. Input gain OdBto 4OdB. Outputgain OdBto 20dB. Input Overload: With OdBInputgain, the input overload indicator willturn on with approxi mately8Vrms i

39、nput signal. At lOdB, approximately 2.5Vrms. At 2OdB, approximately O .8Vrms. At 3OdB, approximately 0.25Vrms. At 4OdB, ap proximately 80mVrms. Output Overload: With OdBInputandOutputgain, the outputoverload indicator will turn on with approximately 8Vrms output signal. AtIOdB, approximately 2.5Vrms

40、. At 2OdB, approximately O.8Vrms. (CE Clear Entry key: Display will reset to the previous entry or toggle between present and previous settings. (ALL CHANNEL) key: When on, parameterchanges will be made simultaneously to all identical filter channels. 2.5 FILTER CHARACTERISTICS 2.5.1 INTRODUCTION Th

41、eModel 31 is an Elliptical (Cauer) filter used in applications where frequency response (fast rolloff) is the primary objective and phase distortion, transient and passband response are s condary requirements. It is an ideal filter for applications requiring signal conditioning. 2.5.2 1kHz AMPLITUDE

42、 RESPONSE The theoretical 7-pole, 6-zero elliptic high-pass filter response, shown in Figure 2.1, has OdB gain at high frequencies with three peaks and valleys of O.22dB p-p amplitude as the freq uency approaches the cutoff frequency of fc. The cutoff fre quency occurs where the filter response is e

43、qual to the most negative excursion of the ripple amplitude. 2-2 Section 2 - Operation The response of the filler at frequencies lower than the cutoff frequency is attenuated at an average rate of 115dB/octave, and as shown in Figure 2.1 has threepeaks and nulls ofattenuation in thestopband. Minimum

44、 attenuation (A min) occurs at frequency Is(O.59fc)and at three frequencies whereminimum attenuationpeaks in the stopband. 1-ST OP8 ANO-l-PASS8ANO-i IV-./ -40 - 1. 0 H H c, s c, -c 1 -60 0 z o -c z -70 OJ -c OJ -c -eo o c. r A m In - 90 - 100 - 110 .1 . 2 .3 .4. I s .7 . 8 .9 2 :3 -4 .5 6 7 8 9 0 FR

45、EOu E:NCY (k HZ) Figure 2.1 Normalized Ripple Response 2.6 VARIABLE BANDPASS and BAND REJECT OPERATION Variable bandpass response can be obtained easily using a Model 31 high-pass filter in series with a Model 30 low-pass filter and setting the low-pass filter to an equal or higher cutoff frequ ency

46、 than the high-pass filter. Selecting the cutoff frequencies provides the desired bandpass response. Variable band reject response isobviously obtained in a mannersimilar to the variable bandpass response except that the low-pass cutoff frequency is set at a lower cutoff frequency than the high-pass

47、 filter to provide the desired band reject range. Nulloperation isobtained bysetting the low cutofffrequency, oftheModel30 (Curve A ofFigure 2.2), a factor of 0.58 below the desired null frequency and the high cutoff frequency, of the Model 31 (Curve B), a factor of 1.7 above the null frequency. Whe

48、n maximum selectivity (Curve C of Figure 2.2) at a specified frequency is required to obtain minimum bandwidth, theModel 30 and Model 31 should be set to the same cutoff frequency. To prevent thepossibility ofexcessive attenuation dueto calibration error,when both cutoffs aresetto the same frequencyall Krohn-Hite elliptical filters are offset by 1% from the keyboard frequency setting. The low-pass filter at 100Hz cutoff frequency is actually tuned to 101Hz and the high-pass filter to 99Hz to minimize potential amplitude loss in narrowband operation. 0