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SRS Labs SR640 Series Manual

Dual-channel filters
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SRS Labs SR640 Series Manual

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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 Dual-channel Filters Series SR640 1290-D Reamwood Avenue, Sunnyvale, California 94089 e-mail: info@thinkSRS.com • www.thinkSRS.com Copyright © 1989, 1999 by SRS, Inc. All Rights Reserved. Revision 2.6 (12/99) Notice: The information described in this manual pertains to the SR640 dual channel low-pass filter, the SR645 dual channel high-pass filter, and the SR650 low-pass high-pass filter.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS CONDENSED INFORMATION Safety and Preparation for Use Specifications INSTRUMENT OVERVIEW Front Panel Operation Power Frequency Display Source Select Coupling and Invert Input and Output Gain Filter In / Out Clear / Local Store and Recall Error, Activity, and Remote GUIDE TO PROGRAMMING Communicating with the SR640 Configuration Switches...
  • Page 4 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 5: Safety And Preparation For Use

    AC line voltage or if the wrong fuse is installed. LINE CORD LINE VOLTAGE SELECTION The SR640 series uses a detachable, three-wire power cord for connection to the power source The SR640 operates from 100, 120, 220 or 240 and to a protective ground. The exposed metal...
  • Page 6 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 7: Specifications

    SR640 SPECIFICATIONS GENERAL INFORMATION The SR640 consists of two independent low-pass filter channels. Each filter is preceded by a low-noise pre- amplifier with selectable gain of 0 to 60 dB. The filters are an 8-pole, 6-zero elliptical design with 0.1 dB maxi- mum passband ripple and 115 dB/octave attenuation slope.
  • Page 8 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 9: Instrument Overview

    INSTRUMENT OVERVIEW FR ONT PANEL SUMMAR Y FREQUENCY DISPLAY FRONT PANEL OPERATION The three digit LED displays indicate the cutoff fre- The front panel has been designed to be nearly self-explanatory. The effect of each keypress is quency of each filter. The adjacent unit LEDs in- usually reflected by a change in the state of a dicate whether the displayed frequency is in Hz or nearby LED.The front panel controls for each filter...

  • Page 10: Coupling And Invert

    Instrument Overview each other and to the filter ground. The filter turn the unit to local operation if the unit has been ground is NOT connected to the unit's chassis placed in the LOCAL LOCKOUT mode. ground. STORE AND RECALL Filter ground for each channel is available at a rear panel BNC connector.

  • Page 11: Guide To Programming

    GUIDE TO PROGR AMMING The SR640 dual channel low-pass filter is remote- ly programmable via both RS-232 and GPIB inter- Command Syntax faces. All front panel features (except offset adjust- ment) may be controlled and read via the Communication with the SR640 is accomplished computer interfaces.
  • Page 12 Guide to Programming face driver must all be configured properly. To con- gram, there is no point in trying to write a program. figure theSR640, the GPIB address must be prop- erly set using the DIP switch on the back panel. Although the National Instruments language con- The SR640 is shipped with the GPIB address set tains many commands, to avoid confusion it is...

  • Page 13: Command List

    COMMAND LIST The command list of the SR640 is detailed be- nary number. The binary number is coded as fol- low. Commands that may be queried have a lows: question mark ? in parentheses (?) after the four character command mnemonic. Commands that meaning may ONLY be queried have a ? after the mnemon- 3 (msb)

  • Page 14: Status And Interface Commands

    Command List 1.01<cr><lf> *SRE(?) {n} *RST The *SRE command sets the service request en- able byte to the value specified by n. Allowed The *RST command resets the instrument. It is values are 0 through 255. When a bit is set in the equivalent to a RCL 0 command (recall default set- status byte, the byte is logically 'anded' with the up).

  • Page 15: Programming Examples Basic

    PR OGRAMMING EXAMPLES The following are examples of programs which communicate with the SR640 in a variety of languages over both RS232 and GPIB. In each case, the program does the same thing: Set the channel 1 pregain to 10 db, the Channel 2 postgain to 20 db, and read the value of the channel 1 cutoff frequency.
  • Page 16 Programming Examples character *80 string real*4answer c initialize gpib card call ibinit(ibsta) c get device id for sr640 sr640 = ibfind('sr640 ') c set pregain and postgain call ibwrt (sr640,'PREG1,1;PSTG2,2',15) c now query stage 1 filter cutoff call ibwrt (sr640,'FREQ?1',6) call ibrd (sr640,string,30) read (string,1000) answer 1000...
  • Page 17 Programmi ng Exam- extern int ibsta; extern int iberr; extern int ibcnt; void main (void) int sr640; char string[30]; float answer; sr640 = ibinit("SR640"); /* locate device */ if (sr640<0) error(); ibwrt (sr640,"PREG1,1;PREG2,2",15); /* set gain */ ibwrt (sr640, "FREQ?1",6); /* query frequency */ ibrd (sr640,string,30);...

  • Page 18: Circuit Description

    Ci r cui t Descr i pti on Stage paramaters for the low pass filter I NTRODUCTI ON are: Schematics for the SR640 series dual- channel filters are shown on the following ω ω /ω pages. They include the following: Pream- plifier, filter stage, output amplifier, op- .6347...
  • Page 19 Ci rcui t Descri p- Output Ampl i fi er nication is accomplished with the UART U15 and GPIB chip U12. Un16A and B select the filter output or by- passed output from the preamplifier. The Power Suppl i es 8-bit DAC U17 provides output gain ad- j ustment.

  • Page 20: Part List

    Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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