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1、Model 3901 GPIB Programmable Elliptical Filter 115dB/Octave Slope 1Hz to 99kHz HP, LP, BP, BR 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 serviceandyouareunabletolocatethesourceoftrouble,contactourService Department at (508) 580-1660, giving all the information available concerning the failure. DO NOTreturn the instrument without our written or verbal au
3、thorization to doso.Aftercontactingus,wewillissueaReturnAuthorizationNumberwhich shouldbereferencedonthepackingslipandpurchaseorder.Inmostcases,we will be able to supply you with the information necessary to repair the instru- ment, avoiding any transportation problems and costs. When it becomes nec
4、- essarytoreturntheinstrument tothefactory,kindlypackitcarefullyand ship it to us prepaid. AllKrohn-Hiteproductsarewarrantedagainstdefectivematerialsandwork- manship.Thiswarrantyappliesforaperiodofoneyearfromthedateofdeliv- erytotheOriginalPurchaser.Anyinstrumentthatisfoundwithintheoneyear warrantyp
5、eriodnottomeetthesestandards,willberepairedorreplaced.This warranty does not apply to electron tubes, fuses or batteries. No other war- ranty is expressed or implied. Krohn-HiteCorporationreservestherighttomakedesignchangesatanytime without incurring any obligation to incorporate thesechanges in ins
6、truments previously purchased. Modificationstothisinstrumentmustnotbemadewithoutthewrittenconsent of an authorized employee of Krohn-Hite Corporation. RadioFans.CN 收音机爱 好者资料库 Model 3901 1Hz to 99kHz Low-Pass, High-Pass Band-Pass, Band-Reject GPIB Programmable Elliptical Filter Serial No. _ Operating
7、 Manual 15 Jonathan Drive, Unit 4, Brockton, MA 02301-5566 U.S.A. Tel: (508) 580-1660; Fax: (508) 583-8989 www.krohn-; infokrohn- Copyright 2005 Krohn-Hite Corporation All rights reserved. Contents of this publication may not be reproduced in any form without the written permission of Krohn-Hite Cor
8、poration. Printed in U.S.A. Ver. 05.16.05 RadioFans.CN 收音机爱 好者资料库 Notes Table of Contents 1.0Section 1 1.1 Introduction 1-1 1.2 Specifications 1-1 1.2.1 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.2 Filter Mode . . . . . . . . . . . . . . . . . . . . . . . .
9、. . . . . . . . 1-1 1.2.3 Amplifier Mode (Each Channel) . . . . . . . . . . . . . . . . . . . 1-2 1.2.4 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.5 Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.3 Shipping to Krohn-Hite f
10、or Repair or Calibration 1-3 1.4 Claim for Damage in Shipment to Original Purchaser 1-4 1.5 External Cleaning 1-4 2.0Section 2 2.1 Introduction 2-1 2.2 Turn-On Procedure 2-1 2.3 Self-Test 2-1 2.4 Front Panel Controls and Display 2-2 2.4.1 Data Keys and Display . . . . . . . . . . . . . . . . . . . .
11、 . . . . . 2-2 2.4.2 Parameter and Control Keys . . . . . . . . . . . . . . . . . . . . . 2-2 2.4.3 Channel Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.4.4 Cutoff Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.4.5 Input Gain (Pre-Filter) . . . . .
12、 . . . . . . . . . . . . . . . . . . . . 2-4 2.4.6 Output Gain (Post-Filter) . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.4.7 Digit Select/ Increment and Decrement . . . . . . . . . . . . . . 2-4 2.4.8 Key Click Feature On/Off . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.5 Rear Panel C
13、ontrols 2-5 2.5.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2.5.2 BNC Connectors and Indicators . . . . . . . . . . . . . . . . . . . 2-5 2.5.2.1InputConnectors 2-5 2.5.2.2OutputConnectors 2-5 2.5.2.3Indicators 2-5 2.5.3 DC Level Adj (Rear Panel) . . . . . . . .
14、 . . . . . . . . . . . . . . 2-5 2.5.4 Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2.5.5 GPIB Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Table of Contents i-i 2.6 Filter Operating Characteristics 2-6 2.6.1 Introduction. . . . . . . .
15、. . . . . . . . . . . . . . . . . . . . . . . . 2-6 2.6.2 Amplitude Response . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2.6.3 Low-Pass Phase Response . . . . . . . . . . . . . . . . . . . . . . . 2-6 2.6.4 High-Pass Phase Response . . . . . . . . . . . . . . . . . . . . . . 2-7 2.6.5 Gr
16、oup Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 2.6.6 Transient Response . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 2.6.7 Impulse Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 2.6.8 Variable Band-Pass Operation . . . . . . . . . . . .
17、 . . . . . . . . 2-9 2.6.9 Band-Reject Operation . . . . . . . . . . . . . . . . . . . . . . . . 2-10 3.0Section 3 3.1 Introduction 3-1 3.2 Preliminary Programming Information 3-1 3.2.1 GPIB Primary Bus Address . . . . . . . . . . . . . . . . . . . . . . 3-1 3.2.2 GPIB Bus Interface Programming Conn
18、ector . . . . . . . . . . . 3-2 3.3 ASCII Data Commands 3-3 3.3.1 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3.3.2 Types of Data Commands . . . . . . . . . . . . . . . . . . . . . . . 3-3 3.3.3 Table of ASCII Commands . . . . . . . . . . . . . . . . . . . . . .
19、3-3 3.3.4 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3.3.4.1 Example1 3-5 3.3.4.2 Example2 3-5 3.3.4.3 Example3 3-5 3.4 IEEE-488 Standard Commands 3-6 3.4.1 Multi-Line Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.4.2 Polling Commands. . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . 3-7 3.4.2.1 ParallelPolling 3-7 3.4.2.2 ServiceRequestAndSerialPolling 3-8 3.4.2.3 SerialResponses 3-8 3.4.3 Uniline Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 3.5 Talker Format 3-9 3.5.1 Parameter Information Format . . . . . .
21、. . . . . . . . . . . . . 3-10 3.5.2 Model Number and Software Version Format . . . . . . . . . . 3-10 3.6 Programming Examples 3-10 3.6.1 Example 1 - Microsoft Quick Basic . . . . . . . . . . . . . . . . 3-10 3.6.2 Example 2 - Borland Turbo C . . . . . . . . . . . . . . . . . . . . 3-12 3.6.3 Examp
22、le 3 - National Instruments IBIC . . . . . . . . . . . . . 3-18 Table of Contents i-ii 4.0Section 4 4.1 Introduction 4-1 4.2 Required Test Equipment 4-1 4.3 Channel 1 - High-Pass 4-1 4.3.1 Pre-Filter. Post-Filter and Unity Gain Accuracy . . . . . . . . . 4-1 4.3.2 Low Bands Ripple Response . . . . .
23、 . . . . . . . . . . . . . . . . 4-2 4.3.3 High Band Ripple Response. . . . . . . . . . . . . . . . . . . . . 4-2 4.3.4 Stopband Attenuation. . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.3.4.1 Band1 4-3 4.3.4.2 Band2 4-3 4.3.4.3 Band3 4-3 4.3.4.4 Band4 4-3 4.3.5 Cutoff Frequency Accuracy
24、. . . . . . . . . . . . . . . . . . . . . . 4-3 4.3.6 Noise Measurements (2MHz Detector Bandwidth) . . . . . . . 4-4 4.4 Channel 2 - Low-Pass 4-4 4.4.1 Pre-Filter, Post-Filter, and Unity Gain Accuracy . . . . . . . . 4-4 4.4.2 Low Band Ripple Response . . . . . . . . . . . . . . . . . . . . . . 4-5
25、4.4.3 High Band Ripple Response. . . . . . . . . . . . . . . . . . . . . 4-5 4.4.4 Stopband Attenuation. . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 4.4.4.1 Band1 4-5 4.4.4.2 Band2 4-6 4.4.4.3 Band4 4-6 4.4.5 Cutoff Frequency Accuracy . . . . . . . . . . . . . . . . . . . . . . 4-6 4.4.6 N
26、oise Measurements (2MHz Detector Bandwidth) . . . . . . . 4-6 4.4.7 Passband Gain and Distortion Tests. . . . . . . . . . . . . . . . . 4-7 Table of Contents i-iii This page intentionally left blank. Table of Contents i-iv Section 1 General Description 1.1Introduction TheKrohn-Hite Model3901 program
27、mable,twochannel,high-pass/low-pass ellipticalfilter/volt- agegainamplifierisoneofafamilyofprogrammablefiltersfromKrohn-Hite.Asanellipticalfilter, theModel3901hastwoindependentfilterchannels,onelow-passandtheotherhigh-pass,allowing forband-passoperationwithatunablecutofffrequencyrangefrom1Hzto99kHza
28、ndarole-offrate of 115dB/octave. Eachfiltersectionhasaminimumstopbandattenuationof80dBandapassbandrippleoftypically 0.22dB. The 3901 provides either a single-ended or differential input with a common mode rejec- tionof60dB.Inputgainsupto40dBin10dBstepsandoutputgainsto20dBin10dBstepsarealso provided.
29、 The 3901 will accept input signals of 10V peak at 0dB gain and has selectable ac or dc coupling.ThefilterisGPIBbusprogrammableandiscomplimentedwithnon-volatilememoryfor storageofupto99frontpanelset-ups.Overloaddetectorsarestandardandassisttheuserindetect- ing excessive input signals or incorrect ga
30、in settings. The 3901q is also a programmable voltage gain amplifier for applications that require a low-noise amplifier.Theamplifierhasabandwidthof1MHzandgainsto60dB,selectablein10dBsteps,and a wideband noise 500kHz at 1Vrms with 0dB gain. Low-Pass, dc coupled, dc to fc; ac coupled, 0.32Hz to fc. R
31、elativeGainatfc:Low-Pass,0.22dBat1.01fcnominal;High-Pass,0.22dBat0.99fcnominal. Cutoff Frequency Accuracy: 2%. FrequencyResolution:1Hz,1Hzto99Hz;10Hz,100Hzto990Hz;100Hz,1kHzto9.9kHz;1kHz, 10kHz to 99kHz. Stopband Attenuation: 80dB. Stopband Frequency (fs): Low-Pass, 1.7fc; High-Pass, 0.59fc. Inserti
32、on Loss: 0dB 0.1dB. Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB 0.2dB. Post-Filter Gain: 0dB, 10dB, 20dB 0.2dB. Input Coupling: ac or dc. WidebandNoise(RFI):min.gain,1kHzcutoff,400V,99kHzcutoff,1mV;Max.gain,20V. Harmonic Distortion: 80dB at 1kHz. Inter-ModulationDistortion:80dBbelowfullscalevoltsat
33、70kHzand90kHzinputfrequency. Spurious Components: 80dB below full scale with input source 50 ohms. DC Stability: Typically 10mV/C. Crosstalk Between Channels: 85dB below full scale with input source 1MHz min gain, 400kHz max. gain; ac coupled, 0.32Hz to 1MHz min gain, 400kHz max gain. Insertion Loss
34、: 0dB 0.05dB. Gain: 10dB to 60dB in 10dB steps 0.1dB. Input: Differential or single-ended +(in phase), (inverted). CMRR: 60dB to 10kHz; approximately 50dB at 100kHz. Sensitivity: 10mV peak with 60dB total gain for 10V peak output. Maximum Input: 10V peak at 0dB gain reduced in proportion to gain set
35、ting. 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 (1V output): 80dB (0.01%)
36、 to 10kHz; 60dB (0.1%) to 100kHz. Wideband Noise (referred to input, 2MHz BW detector): 100V min. gain; 20V max. gain. Section 1 - General Description 1-2 DC Stability (RFI): Typically 10mV/C. Crosstalk Between Channels: 85dB below full scale with input source 50 ohms. 1.2.4General Memory: 99 select
37、able groups; memory is non-volatile battery-backed CMOS. Overload Modes: Three selectable modes; non-latching, that monitors all channels and displays thefirstchanneltohaveanoverload;latching,thatmaintainstheoverloaddisplayuntilitiscleared; and no indications. Overload Indicators: LEDs for input and
38、 output. Gain display flashes when overload occurs on displayed channel. Input Indicators: Green LEDs to indicate active input BNC. Self-Test Diagnostics: MPU checks unit upon power-up. Display indicates failure mode. Displays: 7 segment, green, LED; 0.3 high. RemoteProgramming: IEEE-488.1 interface
39、.Subsets: SH1, AH1,T6, L4, SR1, RL1, PP1, DC1, DT0, C0, E1. Operating Temperature: 0C to 50C. Isolation to Chassis: 100Vdc. Storage Temperature: 20C to 70C. Input/Output Connectors: BNC, front and rear. Power Requirements: 90-132/180-264 volts ac, 50Hz-400Hz, 40 watts. Dimensions: 3.5 (9cm) high, 8.
40、5 (21.8cm) wide, 18 (46.2cm) deep. Weights: 12 lbs (5.4kg) net; 14 lbs (6.3kg) shipping. Accessories: 6 foot, 3 terminal line cord; operating manual. 1.2.5Options Rack Mounting Kit: Part No. RK-37, permits installation of the Model 3901 into a standard 19 rack spacing. Band-Reject Kit: Part No. BR-3
41、0, connectors and cables to adapt two channels for series (band-pass) or parallel (band-reject) operation. Extended 1 Year Warranty: Part No. EW3901. Specifications apply at 25C 5C. Specifications subject to change without notice. Section 1 - General Description 1-3 1.3Shipping to Krohn-Hite for Rep
42、air or Calibration All shipments of Krohn-Hite products should be made via United Parcel Service (UPS) or “Best Way”prepaid.Theproductshouldbeshippedinitsoriginalshippingcarton;orifnotavailable,use anysuitablecontainerthatisrigidandofadequatesize.Ifasubstitutecontainerisused,theproduct should be wra
43、pped in 4 inches of excelsior or similar shock-absorbing material. 1.4Claim for Damage in Shipment to Original Purchaser The product should be thoroughly inspected immediately upon original delivery to purchaser. All materialinthecontainershouldbecheckedagainsttheenclosedpackinglist.Krohn-Hitewillno
44、tbe responsibleforshortagesagainstthepackinglistunlessnotifiedimmediately.Iftheproductisdam- aged in any way, a claim should be filed with the carrier immediately. (To obtain a quotation to re- pairthedamage,contactKrohn-Hiteat(508)580-1660.) Finalclaimandnegotiations withthecar- rier must be comple
45、ted by the customer. 1.5External Cleaning Note: To avoid electrical shock or instrument damage, never get water inside the case. To avoid instrument damage, never apply solvents. Should the Model 3901 need cleaning, wipe the instrument with a cloth that is lightly dampened with water or a mild deter
46、gent solution. Section 1 - General Description 1-4 Section 2 Operation 2.1Introduction The Model 3901 is an elliptical filter with two independent channels, one low-pass and one high-pass, covering the frequency range from 1Hz to 99kHz. All filter parametersare programma- ble via front panel keyboard controls or remotely over the GPIB i
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