krohnhite 30A Manual 电路图.pdf

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1、 MODEL 30A SERIES LOW-PASS ELLIPTICAL PLUG-IN FILTER MODULES MODEL 30A-1: 1Hz to 99kHz MODEL 30A-2: 0.1Hz to 9.9kHz MODEL 30A-3: 0.01Hz to 990Hz OPERATING MANUAL FILTER MODULES MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MOD

2、EL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MODEL_ S/N_ MAINFRAME MICROPROCESSOR MODEL_ S/N_ MODEL_ S/N_ 255 Bodwell Street, Avon, MA 02322-1161 Tel: (508) 580-1660; Fax: (508) 583-8989 E-mail: ; Web: www.krohn- RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Model 30A Table of Contents

3、 TABLE OF CONTENTS 1.0 GENERAL DESCRIPTION .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 2.5 FILTER CHARACTERISTICS .2-3 2.5.1 Introduction .2-3 2.5.2 Normalized R

4、ipple Response.2-3 2.6 VARIABLE BANDPASS and BAND REJECT OPERATION.2-3 2.7 TRANSIENT RESPONSE .2-4 2.8 PHASE RESPONSE.2-5 2.9 DELAY TIME.2-6 2.10 GROUP DELAY .2-6 3.0 IEEE-488 STD (GPIB) PROGRAMMING .3-1 3.1 INTRODUCTION .3-1 3.2 FILTER TYPE .3-1 3.3 MODE OF OPERATION.3-1 3.4 DEVICE CLEAR.3-1 4.0 IN

5、COMING ACCEPTANCE.4-1 4.1 INTRODUCTION .4-1 4.2 TEST EQUIPMENT REQUIRED.4-1 4.3 PRE-FILTER, POST-FILTER AND UNITY GAIN ACCURACY.4-1 4.4 PASSBAND GAIN AND DISTORTION TESTS.4-2 4.4.1 Low Bands Ripple Response .4-2 4.4.2 High Band Ripple Response (Model 30A-1) .4-2 4.4.3 High Band Ripple Response (Mode

6、l 30A-2) .4-3 4.4.4 High Band Ripple Response (Model 30A-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 4.4-4 4.6 CUTOFF FREQUENCY.4-4 4.7 NOISE MEASUREMENTS.4-4 i RadioFans.CN 收音机爱 好者资料库 Model 30A Table of Contents Model 30A Plug-In Filter Module

7、 ii Model 30A Section 1 General Description SECTION 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The Model 30A Series are low-pass, 7-pole, 6-zero elliptical plug-in filters providing 115dB/octave roll-off, a minimum stopband attenuation of 80dB, and a typical passband ripple of 0.22dB peak-to-peak. The M

8、odel 30A-1 covers the range from 1Hz to 99kHz. The Model 30A-2 operates from 0.1Hz to 9.9kHz and from 0.01Hz to 990Hz in the Model 30A-3. With its 115dB/octave rolloff rate, the Model 30A provides a much narrower transition region than an 8-pole Butterworth, and much less passband attenuation near c

9、utoff. The transition region from 3dB to 85dB is 64% of fc (cutoff), compared to 242% for the 8-pole Butterworth. From 0.3dB to 85.6dB, it becomes 70% of fc compared to 404%. This permits lower sampling rates and wider bandwidths, resulting in lower total system costs. The Model 30A Series is part o

10、f an ever expanding line of plug-in filter cards for use in the Model 3905C and 3916C Mainframes, which accommodates 5 to 16 filter cards respectively. 1.2 SPECIFICATIONS FILTER CHARACTERISTICS Function: Low-pass filter, voltage gain amplifier. Type: 7-pole, 6-zero elliptical. Frequency Range fc: Mo

11、del 30A-1: 1Hz to 99kHz. Model 30A-2: 0.1Hz to 9.9kHz. Model 30A-3: 0.01Hz to 990Hz. Resolution: Model 30A-1 Band Frequency Resolution 1 1Hz to 99Hz 1Hz 2 100Hz to 990Hz 10Hz 3 1kHz to 9.9kHz 100Hz 4 10kHz to 99kHz 1000Hz Model 30A-2 Band Frequency Resolution 1 0.1Hz to 9.9Hz 0.1Hz 2 10Hz to 99Hz 1H

12、z 3 100Hz to 990Hz 10Hz 4 1kHz to 9.9kHz 100Hz Model 30A-3 Band Frequency Resolution 1 0.01Hz to 0.99Hz 0.01Hz 2 1Hz to 99Hz 0.1Hz 3 100Hz to 99Hz 1Hz 4 100Hz to 990Hz 10Hz 1-1 Section 1 General Description Model 30A Relative Gain at fc: -0.22dB at 1.01fc nominal. Cutoff Frequency Accuracy: 2%. Stop

13、band Attentuation: 80dB. Stopband Frequency (fs): 1.7fc. Insertion Loss: 0dB; 0.1dB. Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB; 0.2dB Post-Filter Gain: 0dB, 20dB; 0.2dB. Input Coupling: ac or dc. Wideband Noise (RFI): min. gain, 1kHz cutoff, 400V; 99kHz cutoff, 1mV. Max. gain, 20V. Harmonic Disto

14、rtion: -80dB at 1kHz. Intermodulation Distortion: -80dB below full scale volts at 70kHz and 90kHz input frequency. Spurious Components: -80dB below full scale with input source 50 ohms. DC Stability: Typically 10V/C. Crosstalk Between Channels: -85dB below full scale with input source 1MHz min. gain

15、; 400kHz max. gain. Insertion Loss: 0dB; 0.05dB. Gain: 10dB to 60dB in 10dB steps; 0.1dB. Input: Differential or single-ended + (in phase), -(inverted). CMRR: 60dB to 10kHz; 50dB to 99kHz. Sensitivity: 10mV peak with 60dB total gain for 10V peak output. Maximum Input: 10V peak at 0dB gain reduced in

16、 proportion to gain setting. Impedance: 1 megohm in parallel with 100pf. Coupling: ac or dc. Maximum dc Component: 100V in ac coupled mode. Output: Maximum Voltage (o.c.): 7Vrms to 200kHz; 3Vrms to 500kHz; 1Vrms to 1MHz. Impedance: 50 ohms. DC Offset: Adjustable to zero volts. Harmonic Distortion (1

17、V output): -80dB (0.01%) to 10kHz; -60dB (0.1%) to 100kHz. Wideband Noise (referred to input, 2MHz BW detector): 150V min. gain; 25V max. gain. DC Stability (RFI): Typically 10V/C. Crosstalk Between Channels: 85dB below full scale with input source 50 ohms. GENERAL Switch: For select of Input, +(in

18、phase), Differential or (inverted). Input/Output Connectors: BNC. Power: 15 watts. Weight: 1.75 lbs. (0.8kg) net. Specifications apply at 25C 5C. NOTE: Model 30A Series filter cards must be used with the Model 3905B and 3916B Mainframes. 1-2 Model 30A Section 2 Operation SECTION 2 OPERATION 2.1 INTR

19、ODUCTION The Model 30A Series are low-pass plug-in filter modules covering the frequency range from 1Hz to 99kHz (Model 30A-1); 0.1Hz to 9.9kHz (Model 30A-2); 0.01Hz to 990Hz (Model 30A-3). It is one of a series of filter modules available for the vide channel Model 3905 or the sixteen channel 3916

20、Mainframes. 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 programming, refer to Sections 2 and 3 of the Model 3905/3916 Mainframes Operating and Maintenance Manual. Secti

21、on 2.4 of this manual briefly describes the operation of the principal front panel controls and data key operation. 2.2 TURN-ON PROCEDURE a. The line voltage range of the Model 3905/3916 Mainframes has been preset at the factory for either 115V or 230V operation. This range switch is located interna

22、lly 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 the POWER switch on the front panel of the unit is in the off position. c. Plug the line cord into the unit first, then into an ac outlet. CAUTION For safety purposes

23、, the line cord must be connected to a grounded 3 terminal ac outlet. Because of potentially dangerous voltages that exist within the Mainframe, the covers should be moved by qualified personnel. d. If the Model 3905/3916 is remotely programmed via the IEEE-488 GPIB, connect the bus cable to the rea

24、r panel outlet of the Model 39/39A microprocessor module at this time. Programming information is provided in Section 3 of the Model 3905/3916 Operating and Maintenance Manual. e. The POWER switch is a toggle type, located on the front panel of the 3905/3916. After familiarizing yourself with the se

25、lf-test feature described next, turn on the 3905/3916. 2.3 SELF-TEST FEATURE NOTE If there is a malfunction in the micro processor, such as a defective RAM or ROM, the sequence will stop and the word “bAd” will appear in the display followed by a number from 1 to 3. Refer to Section 7.6, Digital Cir

26、cuit Maintenance, to find which RAM or ROM is defective. 2-1 Section 2 - Operation Model 30A When turned on, the Model 3905/3916 microprocessor performs a Self-Test routine whereby the entire RAM and ROM operation are verified. During the test the front panel LEDs and display will light up sequentia

27、lly. When the Self-Test program is complete, the Model 3905/3916 will return to the last set-up prior to turning off the unit. The Model 3905/3916 is now ready to be programmed for operation. 2.4 FRONT PANEL CONTROLS and DISPLAY Data Keys: Data entry keyboard controls, 0-9 and ., and associated 4 di

28、git display set the numeric value of the parameter selected. If a cutoff frequency of 1.5kHz is required, press the 1.5 data keys and parameter keys KILO and FREQ. The frequency will be indicated in the 4 digit display. MODE Key: Indicates the mode of operation in the channel displayed, alternating

29、between low-pass, “L.P.-1” and by-pass, “bYP.”, which connects the input to the output. The “-1” indicates suffix of the filer module Model 30A, i.e. “L.P.-1” is the Model 30A-1. Type Key: Displays “EL-7”, indicating a 7-pole Elliptical filter. Channel: The two channel controls and associated displa

30、y increment or decrement the channel setting. When held, the Model 3905/3916 will cycle through all the channels continuously. The Model 3905 has a 1 digit display, the Model 3905A has 2 digits. The Model 3916 has a 2 digit display, the Model 3916A has 3 digits. Gain Set: Input and Output gain is co

31、ntrolled by two GAIN SET controls and associated 2 digit displays in 10dB steps. Input gain 0dB to 40dB. Output gain 0dB to 20dB. Input Overload: With 0dB Input gain, the input overload indicator will turn on with approximately 8Vrms input signal. At 10dB, approximately 2.5Vrms. AT 20dB, approximate

32、ly 0.8Vrms. At 30dB, approximately 0.25Vrms. AT 40dB, approximately 80mVrms. Output Overload: With 0dB Input and Output gain, the output overload indicator will turn on with approximately 8Vrms output signal. At 10dB, approximately 2.5Vrms. At 20dB, approximately 0.8Vrms. CE Clear Entry Key: Display

33、 will reset to the previous entry or toggle between present and previous settings. ALL CHANNEL Key: When on, parameter changes will be made simultaneously to all identical filter channels. 2-2 Model 30A Section 2 - Operation 2.5 FILTER CHARACTERISTICS 2.5.1 INTRODUCTION The Model 30A is an Elliptica

34、l (Cauer) filter used in applications where frequency response (fast rolloff) is the primary objective and phase distortion, transient and passband response are secondary requirements. It is an ideal filter for A/D conversion (anti-aliasing), D/A conversion (smoothing) and many other applications re

35、quiring signal conditioning. 2.5.2 NORMALIZED RIPPLE RESPONSE The Theoretical 7-pole, 6-zero elliptic low-pass filter response, shown in Figure 2.1, has 0dB gain at low frequencies with three peaks and valleys of 0.22dB p-p amplitude as the frequency approaches the cutoff frequency of fc. The cutoff

36、 frequency occurs where the filter response is equal to the most negative excursion of the ripple amplitude. The response of the filter at frequencies greater than the cutoff frequency is attenuated at an average rate of 115dB/octave, and as shown in Figure 2.1, has three peaks and nulls of attenuat

37、ion in the stopband. Minimum attenuation (A min) occurs at frequency fs (1.7fc) and at three frequencies where the amplitude peaks in the stopband. Frequency Figure 2.1 Normalized Ripple Response 2-3 Section 2 - Operation Model 30A 2.6 VARIABLE BANDPASS and BAND REJECT OPERATION Variable bandpass response can be obtained easily using a Model 30A low-pass filter in series with a Model 31 high-pass filter and setting the low-pass filter to an equal or high cutoff f