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SR630 Manual - Stanford Research Systems

1. Model SR630 16 Channel Thermocouple Reader RS Stanford Research Systems 1290 D Reamwood Avenue Sunnyvale CA 94089 U S A Phone 408 744 9040 Fax 408 744 9049 Email info thinkSRS com e www thinkSRS com Copyright 1992 1994 1995 1997 Stanford Research Systems Inc All Rights Reserved Revision 1 4 02 2009 NI Tabie of Contents Specifications 4 Preparations for Use 5 Symbols 6 Quick Start Instructions 7 Instrument Overview 8 Front Panel Description 9 Rear Panel Description 11 Operation 12 Connecting Thermocouples 12 Setting Instrument Parameters 12 GPIB Address RS232 Baud Rate Time and Date Printer Mode and Scan Dwell Time Logging Mode Setting Channel Parameters 13 Measurement Units Scan Enable TC Type Nominal Temperature Temperature Deviation Chart Span Alarm Enable Alarm Relay and Temperature Limits Troubleshooting and error messages 15 Computer Interfaces 16 Command List 17 Programming Examples 22 Thermocouple Reference Data 26 Characteristics of Thermocouple Types 27 Calibration 29 Voltmeter Input Offsets 30 Voltmeter Gain Factors 30 Zone Block Temperature Offsets 30 Channel Temperature Offsets 31 Analog Output Gain Factors 31 Circuit Description 33 Microprocessor System 33 Display Drivers 33 Analog Outputs and Block Temperature 34 Time and Date 35 Relay Multiplexers 35 Input Amplifiers and ADC 35 Power Supplies 36 Computer Interfaces 36 Front Panel Display 37 Componen
2. 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 NI Components Part List REF R 214 R 215 R 216 R 217 R 218 R 219 R 220 R 221 R 222 R 223 R 224 R 225 R 226 R 227 R 228 R 229 R 230 R 231 R 232 R 300 R 301 R 302 R 303 R 304 R 305 R 306 R 307 R 308 R 309 R 310 R 311 R 312 R 313 R 314 R 315 R 316 R 317 R 318 R 319 R 320 R 321 R 322 R 323 R 324 R 325 Thermocouple Reader N 43 SRS part 4 00081 401 4 00081 401 4 00081 401 4 00056 401 4 00056 401 4 00056 401 4 00056 401 4 00056 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00034 401 4 00048 401 4 00048 401 4 00048 401 4 00031 401 4 00218 408 4 00048 401 4 00048 401 4 00138 407 4 00138 407 4 00138 407 4 00138 407 4 00057 401 4 00057 401 4 00057 401 4 00057 401 4 00386 407 4 00386 407 4 00386 407 4 00386 407 4 00048 401 4 00048 401 4 00048 401 4 00048 401 4 00034 401 4 00034 401 4 00034 401 4 00034 401 4 00218 408 4 00130 407 4 00716 407 VALUE 470 470 470 22 22 22 22 22 470 470 470 470 470 470 10K 2 2K 2 2K 2 2K 100 10 00K 2 2K 2 2K 10 0K 10 0K 10 0K 10 0K 220 220 220 220 30 9K 30 9K 30 9K 30 9K 2 2K 2 2K 2 2K 2 2K 10K 10K 10K 10K 10 00K 1 00K 1 40K DESCRIPTION Resistor Carbon Film 1 4W 5 Resistor Carbon Fil
3. 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 1096 SL Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Metallized Polyester Capacitor Mylar Poly 50V 596 Rad Capacitor Mylar Poly 50V 596 Rad Cap Stacked Metal Film 50V 5 40 85c Cap Stacked Metal Film 50V 5 40 85c Cap Stacked Metal Film 50V 5 40 85c Cap Stacked Metal Film 50V 5 40 85c Cap Stacked Metal Film 50V 5 40 85c Capacitor Polypropylene Capacitor Polypropylene Capacitor Polypropylene Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Electrolytic 16V 2096 Rad Capacitor Electrolytic 16V 2096 Rad Cap Mini Electrolytic 50V 20 Radial Cap Mini Electrolytic 50V 20 Radial Capacitor Tantalum 35V 2096 Rad Capacitor Tantalum 35V 2096 Rad Capacitor Tantalum 35V 2096 Rad Cap Mini Electrolytic 50V 20 Radial Capacitor Electrolytic 35V 2096 Rad Capacitor Electrolytic 35V 20 Rad Capacitor Ceramic Disc 50V 2096 Z5U Cap Mini Electrolytic 50V 20 Radial Capacitor Tantalum 35V 2096 Rad So Model SR630 NI Components Part List REF C 613 C 614 C 615 C 616 C 617 C 618 C 619 C 620 C 621 C 622 C 623 C 624 C 625 C 626 C 627 C 628 C 629 C 630 C 631 C 632 C 633 C 634 C 635 C 636 C 637 C 638 C 639 C 640 C 641 C 642 C 643 C 644 C 645 C 646 C 647 C 648 C 649 C 650 C 651 C 652 C 653 C 654 C 655 C 656
4. To communicate with the SR630 over the GPIB interface the proper device address must be set This may be done from the front panel by using the PARAMETER SELECT up and down arrow keys to select GPIB ADD from the parameter list Use the numeric keypad to enter a number between 1 and 31 RS232 commands are identical to those used with GPIB The baud rate for RS 232 communications may be set from 150 to 9600 baud by using the PARAMETER SELECT up and down arrow keys to select RS232 BAUD from the parameter list Use the numeric keypad to enter a baud rate 150 300 600 9600 Command Syntax Communications with the SR630 use ASCII characters Commands may be in either UPPER or lower case and may contain any number of embedded space characters A command to the SR630 consists of a four character command mnemonic arguments if necessary and a command terminator The terminator is a linefeed If or EOI for GPIB a cr or If for RS232 No command processing occurs until a command terminator is received Command mnemonics beginning with an asterisk are IEEE 488 2 1987 defined common commands Commands may require one or more parameters with multiple parameters separated by commas Multiple commands may be sent on one command line by separating them by semicolons Sending multiple commands in one line ensures that they will be executed simultaneously and allows synchronization to be achieved using the synchronization c
5. 50PPM Components Part List REF R 326 R 327 R 401 R 402 R 403 R 404 R 405 R 406 R 407 R 408 R 409 R 410 R 411 R 412 R 413 R 414 R 415 R 416 R 417 R 418 R 419 R 420 R 421 R 422 R 423 R 500 R 501 R 502 R 503 R 504 R 505 R 506 R 507 R 509 R 510 R 511 R 512 R 513 R 514 R 515 R 516 R 517 R 518 R 519 R 520 a Model SR630 SRS part 4 00716 407 4 00034 401 4 01610 407 4 00684 408 4 00451 448 4 00451 448 4 00684 408 4 00218 408 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00035 401 4 00031 401 4 00076 401 4 00031 401 4 00031 401 4 00081 401 4 00076 401 4 00081 401 4 00076 401 4 00081 401 4 00021 401 4 00081 401 4 00076 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00048 401 4 00021 401 4 00155 407 4 00685 408 4 00145 407 VALUE 1 40K 10K 9 90M 100 0K 10 0K 10 0K 100 0K 10 00K 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 10M 100 390 100 100 470 390 470 390 470 1 0K 470 390 470 470 470 470 2 2K 1 0K 150K 100 110 DESCRIPTION Resistor Metal Film 1 8W 1 50PPM Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 0 1 25ppm Resistor Metal Film 1W 1 Resistor Metal Film 1W 1 Resistor Metal Film 1
6. 544 R 545 R 546 R 547 R 548 R 549 R 601 R 604 R 605 R 606 R 607 R 608 R 700 R 701 R 702 R 703 R 704 SO101 SO504 SP200 SW600 T 1 Thermocouple Reader N 45 SRS part 4 00686 408 4 00687 408 4 00217 408 4 00688 408 4 00689 408 4 00689 408 4 00689 408 4 00689 408 4 00688 408 4 00688 408 4 00689 408 4 00689 408 4 00689 408 4 00689 408 4 00688 408 4 00688 408 4 00688 408 4 00217 408 4 00048 401 4 00193 407 4 00193 407 4 00135 407 4 00176 407 4 00176 407 4 00135 407 4 00130 407 4 00130 407 4 00131 407 4 00131 407 4 00032 401 4 00034 401 4 00032 401 4 00034 401 4 00032 401 4 00021 401 4 00021 401 4 00021 401 4 00021 401 4 00021 401 4 00021 401 1 00026 150 1 00028 150 6 00096 600 2 00023 218 6 00093 610 VALUE 6 190K 3 320K 1 000K 1 470K 2 150K 2 150K 2 150K 2 150K 1 470K 1 470K 2 150K 2 150K 2 150K 2 150K 1 470K 1 470K 1 470K 1 000K 2 2K 499 499 1 50K 3 01K 3 01K 1 50K 1 00K 1 00K 1 00M 1 00M 100K 10K 100K 10K 100K 1 0K 1 0K 1 0K 1 0K 1 0K 1 0K 28 PIN 600 MIL 8 PIN 300 MIL MINI DPDT SR630 DESCRIPTION Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1
7. 665 C 666 C 667 C 668 C 669 C 670 C 671 C 672 C 673 C 674 C 675 C 676 C 677 C 678 C 679 C 700 C 701 C 702 C 703 C 704 C 705 C 706 C 707 C 708 C 709 C 710 C711 C712 C 713 C 714 D 1 D2 D3 D4 D5 D6 D7 D8 0 LLLLOCCLGLLCGCGGLLUSGUUU Model SR630 SRS part 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00225 548 5 00219 529 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00022 501 5 00100 51 7 5 00012 501 5 00012 501 5 00100 51 7 5 00012 501 5 00012 501 5 00012 501 5 00012 501 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 VALUE 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 1U AXIAL 01U 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 001U 2 2U 330P 330P 2 2U 330P 330P 330P 330P GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN DESCRIPTION Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5
8. 8W 0 1 25ppm Resistor Metal Film 1 8W 0 1 25ppm Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 0 1 25ppm Resistor Metal Film 1 8W 1 50PPM NI Components Part List REF R 521 R 522 R 523 R 524 R 525 R 526 R 527 R 528 R 529 R 530 R 531 R 532 R 533 R 534 R 535 R 536 R 537 R 538 R 539 R 540 R 541 R 542 R 543 R
9. C 657 Thermocouple Reader N 3 SRS part 5 00100 517 9 00192 542 5 00196 520 5 00040 509 9 00192 542 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 5 00219 529 VALUE 2 2U 22U MIN 6800U 1 0U 22U MIN 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U 01U DESCRIPTION Capacitor Tantalum 35V 2096 Rad Cap Mini Electrolytic 50V 20 Radial Capacitor Electrolytic 16V 2096 Rad Capacitor Electrolytic 50V 20 Rad Cap Mini Electrolytic 50V 20 Radial Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Cap
10. K type thermocouple to channel 8 and install the thermal shield in such a way as to press the thermocouple leads against the thermal block on the rear panel of the instrument Attach the other end of this thermocouple to an thermometer with a 0 1 C error Use the SR630 to read the temperature on channel 8 Be certain to configure channel 8 to display in units of C and specify TC TYPE 3 Subtract the reading on the SR630 from the temperature indicated on the reference thermometer and multiply by ten The result should be added to calibration constant 417 the block temperature offset For example if the reference thermometer reads 25 4 C and the SR630 indicates 25 0 C then 10 25 4 25 0 4 should be added to calibration constant 17 To adjust calibration constant 17 press the TEMP and BKSP keys simultaneously so that the display shows cL oFFS ALL Then press the PARAMETER SELECT A up arrow key twice to display the first calibration constant See list in preceding section Then press the CHANNEL SELECT A up arrow key 16 times to display calibration constant 17 Add the result of the calibration calculation to the present value which is displayed in the MEASUREMENT window Type the sum using the numeric keypad and press the EXC key to enter the result After adjusting the block temperature calibration constant the SR630 should read the same temperature as the reference thermometer Note that the standard
11. PIN DIL SR630 MAIN SR630 FP SR630 OPTION 2N3904 2N3904 2N3906 2N3906 2N3906 2N3906 2N3906 2N3906 2N3906 2N3906 2N5210 2N5210 2 2K 10K 1 5K 1 0M 10K 10K 10K 10K 1 5K 100K 220 2 2K 470 470 470 470 470 470 470 470 470 470 470 470 470 DESCRIPTION Connector IEEE488 Reverse R A Female Connector D Sub Right Angle PC Female Connector D Sub Right Angle PC Female Connector Male Connector Male Printed Circuit Board Printed Circuit Board Printed Circuit Board Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Transistor TO 92 Package Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film
12. To display or modify the span select CHART SPAN with the PARAMETER SELECT up down keys For example if the span is set to 25 degrees then the analog output will be at full scale 10 Vdc when the temperature for that channel is 25 degrees greater than nominal and minus full scale 10 Vdc when the temperature is 25 degrees below nominal CHART SPAN may be set to a negative value in which case the analog output decreases as the temperature increases This feature may be used for controlling heaters in a closed loop system In such a control system the gain of the feedback is increased when the chart span is decreased Alarm Enable The alarm feature may be enabled on a channel by channel basis To examine or modify the alarm enable status for the currently selected channel use the PARAMETER SELECT up down keys to select the ENABLE ALARM parameter The YES NO key the minus sign on the keypad may be used to modify the current alarm enable status If the measured temperature or voltage exceeds the set limits Tmax and Tmin and the alarm enable status bit is set then the audio alarm will sound The out of limit channel number is displayed on the front panel and a rear panel BNC provides a switch closure e g to turn on an alarm LED or light Alarm Relay The relay switch is a Hasco HS212 in a SPST layout rated for up to 1A and 100V AC or DC 30W 60VA maximum into a resistive load Operate and release times are
13. U 425 U 426 U 427 U 503A U 503B U 503C U 503D U 503E U 503F U 503G U 503H U 504 U 506 U 507 U 509 U 510 U 511 U 512 U 513 U 514 U 515 U 516 U 517 U 600 U 601 Thermocouple Reader O 47 SRS part 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00308 335 3 00126 335 3 00195 340 3 00303 340 3 00195 340 3 00303 340 3 00303 340 3 00195 340 3 00303 340 3 00195 340 3 00195 340 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00419 340 3 00420 340 3 00417 340 3 00412 340 3 00402 340 3 00185 340 3 00250 340 3 00250 340 3 00446 340 3 00446 340 3 00446 340 3 00446 340 3 001 12 329 3 001 19 329 VALUE DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V 51A05 CA3082 74HC164 CA3082 74HC164 74HC164 CA3082 74HC164 CA3082 CA3082 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 LTC1051 TSC850 74HC165 AD1403 74HC4052 LM2901 PS2401A 2 PS2401A 2 6N137 6N137 6N137 6N137 7805 7905 DESCRIPTION Relay Relay Relay Relay Relay Relay Relay Relay Relay Relay Relay Relay Relay Relay Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circui
14. actually sent as part of the command string Commands that may ONLY be queried have a after the mnemonic Commands that MAY NOT be queried have no question mark o modei SR630 ee Command List General channel independent commands GPIB n The GPIB command sets or reads the GPIB address If remote commands are being sent over GPIB changing the address will stop communications BAUD n The BAUD command sets or reads the RS232 baud rate Choices are 150 300 600 1200 2400 4800 and 9600 Sending this command is recommended at the start of a program as this will initialize the SR630 s RS232 port However changing the baud rate while talking over RS232 will stop communications cf GPIB TIME n n n The TIME command sets or reads the time on the SR630 Command transmission order is Hr Min Sec Queries will return the time in the same format separated by commas Note the SR630 s clock runs on 24hr time e g 5 00 PM 17 00 DATE n n n The DATE command sets or reads the date Proper format for transmission is Month Day Year Queries will return the date in the same format separated by commas PRTM mnem The PRTM command sets the printer mode The user can choose between GHPH and LIST modes or the printer may be turned OFF DWEL n The DWEL command sets the time between the start of successive scans The time n is specified in seconds and is in the range 10 to 9999 Channel dependent
15. approximately 3 mS and 2 mS respectively Temperature Voltage Limits Both the upper and lower temperature or voltage limits for the alarm function may be set for each channel To display or set the upper temperature or voltage limit use the PARAMETER SELECT up down keys to light the Tmax indicator The temperature or voltage limit may be entered using the numeric PARAMETER ENTRY keypad The value must be entered in the units set for the channel Tmin may be entered in the same way If the UNITS parameter is changed between degrees K C or F the alarm limits will also be converted so that the alarms will not be affected by this change However different alarm limits are saved for voltages so selecting volts or millivolts for the channel will affect alarm limits Note The alarm will not activate if the specified channel is never measured i e not selected or not enabled for scanning even if the ALARM ENABLE parameter is set to YES Multiplexer Mode The SR630 may be used as a 15 Channel differential analog signal multiplexer This allows one of 15 analog signals selected by the SR630 to be passed to other instruments In this mode of operation the relay for channel 16 will always be enabled The selected channel may be read by the SR630 and is available to other instruments on the terminals which are normally used as an input to channel 16 To enter the multiplex mode press the Bksp and buttons on the fr
16. be returned using RLOG reading only a single measurement at a time is recommended i e RLOG x 1 for maximum program control This also minimizes possible synchronization problems Measurement Commands MEAS ch The MEAS query returns the value measured by channel ch in the selected units Note mDC returns values in milliVolts while DC returns values in Volts See UNIT and CHAN commands CHAN ch The CHAN command switches the 630 to read from channel ch The query version CHAN returns the current channel number WAI The WAI wait command holds off further command execution until all commands currently in progress are completed This command ensures that a particular operation is finished before continuing GPIB Common Commands IDN The IDN common query returns the SR630 s device identification string The string format is StanfordResearchSystems SR630 xxxxx yyyy where xxxxx is the serial number and yyyy is the firmware version number STO i The STO command stores the current parameter settings for all 16 channels in memory The argument i can be in the range 1 9 RCL i The RCL command recalls parameter setting from memory The argument can be from 1 9 or 0 to recall default settings CLS The CLS command clears all status registers ESE i The ESE command sets the standard status byte enable register to the value i ESR i The ESR command reads the value of the the st
17. commands UNIT ch mnem The UNIT command selects the units of channel ch Possible arguments are ABS Kelvin CENT FHRN mDC mV or DC Queries will return the currently assigned mnemonic SCNE chhmnem The SCNE commands enables or disables the scan option on channel ch Possible arguments are YES or NO and queries will return the same format TTYP chhmnem The TTYP command selects the thermocouple type for channel ch Possible arguments are B E J K R S and T Queries will return the currently assigned letter type Note although the SR630 displays thermocouple type numerically on the front panel numeric arguments are not allowed for this command TNOM ch n The TNOM command sets the nominal temperature value for channel ch to n The range of possible values is For temperature 270 to 3300 For voltage 99 999 to 99 999 TDLT ch The TDLT command returns the value of delta T for channel ch defined as T measured T nominal SPAN ch x The SPAN command sets or reads the allowable span for channel ch to set printer graph ranges or for the rear panel strip chart outputs Thermocouple Reader N 1 Command List Bi 7 7___ ALRM chhmnem The ALRM command enables YES or disables NO the alarm function for channel ch TMIN ch x The TMIN command sets the alarm lower voltage or temperature limit of channel ch to x The range for x is the same as for the command TNOM TMAX ch
18. limits of error for the thermocouple wire used in the calibration do not affect the accuracy of the calibration Channel Temperature Offsets Each channel has a calibration byte which simply offsets the computed temperature and these are stored as calibration constants 18 through 433 This allows the user to precisely calibrate the instrument for each channel in order to remove any remaining inaccuracies such as_ the thermocouple wire standard error All of these temperature offsets have a nominal value of zero These offsets have a range of 127 allowing temperature offsets of 12 7 C Increasing these calibration constants will increase the reported temperature To adjust calibration constant 18 press the TEMP and BKSP keys simultaneously so that the display shows cL oFFS ALL Then press the PARAMETER SELECT A up arrow key twice to display the first calibration constant See list in preceding section Then press the CHANNEL SELECT A up arrow key 17 times to display calibration constant 18 Type the desired temperature offset for channel 1 in tenths of C using the numeric keypad and press the EXC key to enter the result To access the next calibration value press the CHANNEL SELECT A up arrow once and enter the desired temperature offset for the next channel per the table at the beginning of this section Analog Output Voltage Offsets There are four calibration constants 34 37 which are used to cor
19. one of the signals on channels 1 to 15 may be passed to other instruments via the terminals for channel 16 This command will be ignored if the unit is in calibration mode or scanning mode Thermocouple Reader N 21 Program Examples N This program is a simple example of interfacing the SR630 Thermocouple monitor to a PC via the RS232 A standard serial cable is connected between the COM 1 port of the PC and the RS232 port of the SR630 The program was written in GW BASIC 10 Example program to read measurements from the SR630 20 This program uses IBM Basic and communicates via the COM1 30 RS232 port 40 50 Set up COM 1 for 9600 baud no parity 8 data bits 2 stop bits 60 ignore dsr and cd 70 OPEN COM 1 9600 n 8 2 ds cd as 1 80 PRINT 1 Clear COM1 90 100 Now set up sr630 reset and choose units for ch1 and ch16 110 PRINT 1 RST UNIT1 ABS UNIT16 FHRN 120 130 PRINT Channel 1 K Channel 16 F 140 PRINT 41 MEAS 1 Measure channel 1 150 INPUT 1 VALI Get reading from sr630 160 PRINT 1 MEAS 16 Now do the same for ch 16 170 INPUT 1 VAL2 180 PRINT VALI VAL2 190 GOTO 140 Loop forever o NENNEN Model SR630 eee program Examples This program written in Microsoft C illustrates use of the SR630 Thermocouple Reader with the GPIB interface bus The program also uses the data logging buffer of the SR630 Note use of the data logging buffer is optional In most interf
20. x The TMAX command sets the alarm upper voltage or temperature limit of channel ch to x The range for x is the same as for TMIN and TNOM VMOD ch i The VMOD command allows the user to set the rear panel analog output ch to either i 0 track the corresponding channel or i 1 act as a programmable voltage source The allowable range for ch is 1 4 VOUT ch x The VOUT command sets the output voltage of analog output ch 1 4 when set for programmable output The voltage can be in the range 9 999 to 9 999 Calibration Commands CAL n The CAL command allows the user to calibrate either the offset or gain bytes Options for n are 0 autocal all offset bytes 1 8 calibrate individual offset byte n 9 16 calibrate individual gain byte n Offset calibration is performed using channel 16 as the reference ch 16 must be shorted while gain calibration requires a reference on channel 15 equal to the full scale voltage of the range to be calibrated The CAL command will return one of the following values 0 Calibration successful byte n Out of range result when attempting to calibrate byte n 200 Cal mode error e g user was in relay multiplex mode when trying to calibrate CALB n The CALB command allows the user to read or write cal byte n For a full listing of the cal bytes and their descriptions see the chapter on Calibration Data Logging Commands SCAN i The SCAN command enables i21 o
21. 25 0 00286 053 0 00299 000 0 00408 000 0 00410 032 0 00411 000 0 00412 060 0 00500 000 0 00523 048 0 00893 026 1 00052 1 71 1 00073 120 1 00087 131 1 00133 171 VALUE 7815 7915 7805 NAT9914BPD DS75160A DS75161A 74LS374 DS75451N MC1489 UPD71051C MC1488 4 9152 MHZ 32 68 KHZ 6J4 4 40 KEP 8 32 KEP 4 A0X3 16 M F 320882 4 4 SPLIT 3 1 2 424 4 24 o 24 4 40X1 4PP 4 40X3 8PF 4 SHOULDER HANDLE1 F1404 6 32X1 APF TO 220 4 40X1 2 PP 10 32X1 2 6 24 GRN 1 8 ADHES TAPE 1 4 ADHES TAPE BLOCK 1 4 ADHES CAPTIVE PANEL 554808 1 5 5 8 18 8 32X3 8PF 40 COND INSL 2 PIN JUMPER 40 COND DESCRIPTION Voltage Reg TO 220 TAB Package Voltage Reg TO 220 TAB Package Voltage Reg TO 220 TAB Package Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Crystal Crystal Power_Entry Hardware Nut Kep Nut Kep Standoff Termination Tie Washer Split Wire 24 UL1007 Strip 1 4x1 4 Tin Wire 24 UL1007 Strip 1 4x1 4 Tin Wire 24 UL1007 Strip 1 4x1 4 Tin Screw Panhead Phillips Screw Flathead Phillips Washer nylon Hardware Misc Power Button Screw Black All Types Insulators Screw Panhead Phillips Screw Allen Head Wire 24 UL1007 Strip 1 4x1 4 Tin H
22. 6 C 607 C 608 C 609 C 610 C 611 C 612 SRS part 6 00001 612 5 00002 501 5 00027 503 5 00002 501 5 00225 548 5 00225 548 5 00002 501 5 00002 501 5 00002 501 5 00002 501 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00225 548 5 00006 501 5 00008 501 5 00225 548 5 00247 533 5 00061 513 5 00061 513 5 00056 512 9 00056 512 9 00056 512 9 00056 512 9 00056 512 9 00183 535 5 00248 535 5 00248 535 5 00225 548 9 00030 520 9 00030 520 9 00192 542 9 00192 542 5 00100 51 7 5 00100 51 7 5 00100 51 7 9 00192 542 9 00201 526 9 00201 526 5 00027 503 5 00192 542 5 00100 51 7 VALUE BR 2 3A 2PIN PC 100P 01U 100P 1U AXIAL 1U AXIAL 100P 100P 100P 100P 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 1U AXIAL 15P 22P 1U AXIAL 001U 001U 001U AU 1U AU AU AU 1U 2 A7U A7U 1U AXIAL 2200U 2200U 22U MIN 22U MIN 2 2U 2 2U 2 2U 22U MIN 2200U 2200U 01U 22U MIN 2 2U DESCRIPTION Battery Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 2096 Z5U Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic
23. 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Metal Film 1 8W 0 196 25ppm Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 196 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Socket THRU HOLE Socket THRU HOLE Misc Components Switch Panel Mount Power Rocker Transformer Components Part List REF U 1 U 2 U3 U4 U5 U6 U7 U8 U9 U 10 U 11 U 100 U 102 U 103 U 104 U 105 U 106 U 107 U 108 U 109 U 110 U 111 U 112 U 200 U 201 U 202 U 203 U 205
24. 9 D 21 D 22 D 23 D 24 D 26 D 27 D 28 D 31 D 32 D 33 D 34 D 35 D 36 D 100 D 101 D 102 D 103 D 300 D 301 D 500 D 501 D 600 D 601 D 603 D 604 D 700 D 701 J1 J 100 J 200 J 300 J 301 J 302 J 303 Thermocouple Reader e 4 SRS part 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00012 306 3 00013 306 3 00012 306 3 00012 306 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00004 301 3 00203 301 3 00004 301 3 00004 301 3 00004 301 3 00368 301 3 00368 301 3 00470 301 3 00470 301 3 00062 340 3 00062 340 3 00062 340 3 00004 301 3 00198 301 3 00198 301 1 00038 130 1 00038 130 1 00038 130 1 00003 120 1 00003 120 1 00003 120 1 00003 120 VALUE GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN RED GREEN GREEN 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N5711 1N4148 1N4148 1N4148 1N753A 1N753A 1N5221B 1N5221B KBP201G BR 81D KBP201G BR 81D KBP201G BR 81D 1N4148 1N5231B 1N5231B 40 PIN DIL 40 PIN DIL 40 PIN DIL BNC BNC BNC BNC DESCRIPTION LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectan
25. DD Not affected RS232 BAUD Not affected DATE Not affected TIME Not affected PRINTER Off DWELL 10 s UNITS Deg C SCAN ENABLE Yes TC TYPE K T NOM 0 CHART SPAN 1000 ALARM ENABLE Yes for 1 to 4 Tmax 1000 Tmin 0 Table 2 Instrument Default State after RCL 0 Parameter Entry Parameters may be entered using the 15 button keypad If the instrument is in the GPIB REMOTE mode press the execute EXC key first to return to LOCAL operation Numeric parameters e g GPIB address or nominal temperatures may be entered directly while non numeric ones e g printer mode and display units are selected by pressing the key directly below the desired legend The PARAMETER display indicates non numeric data as follows PRINTER OFF LISt grPh UNITS AbS CEnt FrEn dC SCAN EN yES no The entered parameter becomes valid when the EXC key is pressed or when a parameter up down key is pressed The backspace key BKSP may be used to delete a key press or to return to the previous value if all of the new key presses are deleted If the UNITS for a channel are changed then Tnom CHART SPAN Tmax and Tmin will be calculated to replace the existing values This allows the user to change units without affecting the operation of the alarms or analog outputs The relative temperature display will be in the new units The TEMP key provides a convenient way to enter the present temperature for Tnom The MEASUREMENT Display will be for
26. ED STB 10H LED EVEN 18H LED ODD 20H LED LAMP 28H KEN RD 30H DAC MPX 38H DAC STB 40H CS TEMP 48H CS RLY CTL 50H CS BITS IN 58H CS BITS OUT 60H CS GPIB 68H CS UART 70H CS PRINTER 78H RLY SHIFT Description Chip select for 8253 Counter Timer LED Key scan and alarm strobes oegment data for even display digits oegment data for odd display digits L amp data for individual indicators Keyboard and ADC clock and data inputs DAC refresh MPX and DAC LSBs amp RIC Eight MSBs to DAC refresh circuit Temperature comparator and RTC inputs Input relay control amp RTC MPX control Overload CAL enable amp interface bits Amp gain ADC RD RTC and printer ctl GPIB controller chip select UART controller chip select Eight bit latch for printer data Shift strobe for 16 channel relay multiplexer Table 10 I O Port Addresses and Functions The display refresh is part of the real time interrupt routine Keyboard data and ADC BUSY bits are read via the KEY RD input port just prior to changing the display STROBEs The line frequency is also determined during program initialization by measuring the duration of the LINE period at this input port If the ADC BUSY bit is low but was high at the start of the previous real time interrupt then it is time to read the ADC data The ADC data is read by a tight uninterrupted routine which synchronizes itself to the ADC_CLK An audio transducer for key clicks an
27. ELECT A up arrow key to select calibration constant 34 Subtract the computed correction to the existing calibration constant and key in the new value using the numeric keypad and press the EXC key to enter the result Repeat for calibration constants 435 36 and 37 2 WE Model SR630 ee Circuit Description All circuitry for the SR630 are located on three printed circuit boards The front panel PCB contains the LED lamps seven segment displays and the keypad matrix The rear panel PCB contains the GPIB RS232 and printer interfaces The main PCB which runs the length of the instrument contains all the other analog and digital circuitry The rear portion of the main PCB is thermally isolated from the rest of the unit to reduce thermal gradients which can reduce the accuracy of temperature measurements The front panel PCB and the interface PCB attach to the main PCB via 40 pin ribbon cables The terminal strip for the 16 differential input channels is mounted directly to the main PCB A metal block is placed directly behind the terminal strip in thermal contact with the terminal strip to reduce temperature fluctuations The temperature of the metal block is measured with a semiconductor sensor in order to compensate for the thermal emf s created at the terminal strip connections Main PCB Microprocessor System TC1C Sheet 1 of 6 The CPU is a CMOS Z80B running at 4 9152 MHz This clock frequency is convenient for
28. Enable Disable jumper is in the Enable position The function of the calibration bytes is detailed in the calibration section of this manual An 8253 Counter Timer is used to generate clocks for real time interrupts baud rates and analog to digital conversion The real time interrupt rate is 12 times the line frequency either 600 Hz or 720 Hz The baud rate clock may be set from 16 x 150 Hz to 16 x 9600 Hz The ADC which requires 5120 clocks to complete a conversion is clocked at either 51 200 kHz for 50 Hz line frequency or 61 44 kHz for 60 Hz lines in order to provide a high degree of noise immunity at the line frequency and its harmonics A 74HC154 1 16 decoder generates port strobes during I O requests The drivers for the LED displays will be disabled if the CPU should cease operation Display Drivers TC2C Sheet 2 of 6 The front panel LED displays are time multiplexed into six slots To refresh the display all the STROBE lines are de asserted by writing 1 s to the strobe latch the segment data for the next pair of displays is written to the EVEN and ODD latches a segment is turned ON by writing a zero to the corresponding latch bit LED indicators in the next row are turned ON by writing a zero to the corresponding LAMP bit and by asserting the next column strobe by writing a zero to the selected STROBE bit Thermocouple Reader N 33 Circuit Description I Address Name 00H CS TIMER 08H L
29. Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg N N AU N e NS LS m Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Relay Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuii Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Relay Relay Relay Relay Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg Thru hole Pkg N Mm Mm AN AN NN Nm a es IAA eG ia MM mm GN Oe KK EE EE NOG NSG NOG NSG NSO NSG NSO NOGO NO NO NO NO NI Components Part List REF U 405 U 406 U 407 U 408 U 409 U 410 U 411 U 412 U 413 U 414 U 415 U 416 U 417 U 418 U 419 U 420 U 421 U 422 U 423 U 424
30. U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Cap Monolythic Ceramic 50V 2096 Z5U Capacitor Ceramic 50V 80 20 Z5U AX Cap Monolythic Ceramic 50V 2096 Z5U Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic Disc 50V 10 SL Capacitor Tantalum 35V 2096 Rad Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL Capacitor Tantalum 35V 2096 Rad Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 1096 SL LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular LED Rectangular NI Components Part List REF D9 D 10 D 11 D 12 D 13 D 14 D 15 D 16 D 17 D 18 D 1
31. U 206 U 300 U 301 U 302 U 303 U 305 U 307 U 308 U 309 U 310 U 311 U 312 U 400 U 401 U 402 U 403 U 404 ao Model SR630 SRS part 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00288 340 3 00298 340 3 00299 341 3 00491 340 3 00158 340 3 0041 1 340 3 00044 340 3 00049 340 3 00155 340 3 00045 340 3 00155 340 3 00039 340 3 00196 335 3 00046 340 3 00046 340 3 00046 340 3 00046 340 3 00044 340 3 00049 340 3 00412 340 3 00105 340 3 0041 1 340 3 00185 340 3 00413 340 3 00414 340 3 00415 340 3 00270 340 3 00044 340 3 00416 340 3 00087 340 3 0041 1 340 3 00308 335 3 00308 335 3 00308 335 3 00308 335 VALUE HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 HDSP H101 Z80H 32KX8 70L UPD71054C 74HC154N 74HC273 74HC244 74HC74 74HCO4 74HC32 74HCO4 4HC14 HS 212S b 74HC374 74HC374 74HC374 74HC374 74HC244 74HC74 AD1403 LM741 74HC273 LM2901 LM34DZ 74HC4066 AD7845 74HC4051 74HC244 TC8250AP LF347 74HC273 DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DS2E ML2 DC5V DESCRIPTION Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuii STATIC RAM I C Integrated Circuit Thru hole
32. YPE parameter is lit will cause the thermocouple type to change immediately to K This parameter has no effect when voltages are displayed Special Note The CHART SPAN Tnom AT Tmax and Tmin parameters may be used to specify either temperatures the usual case or voltages In this way the SR630 may be used to display list graph and alarm either temperature or voltage conditions Values must be entered in the same units which have been set for the channel a temperature should be entered if UNITS has been set to degrees K C or F anda voltage should be entered if UNITS has been set to volts or millivolts Nominal Temperature or Voltage A nominal temperature voltage may be displayed and set for each channel by selecting the Tnom parameter The nominal value is subtracted from the present measurement when AT T Tnom is the selected parameter The nominal value also sets the center value for the analog strip chart outputs and for graphical printer outputs Thermocouple Reader N 1 Instrument Operation I Temperature or Voltage Deviation Select AT T Tnom to display the deviation of the present reading from the nominal temperature or voltage The deviation from nominal is displayed in the units set for the channel No data may be entered when AT T Tnom is displayed Chart Span The CHART SPAN parameter sets the full scale temperature or voltage for the rear panel analog outputs and graphics mode printer output
33. ace applications the computer will select the channel and read the data without the use of scans and data buffers This program will scan three channels 1 3 then print out the first twenty one points of logger data received in Ascii form id This program is written in Microsoft C version 5 1 The header file for the GPIB interface is supplied by ms c488 h and is supplied by CEC To compile this program use the command CL AL c prog c Then link the resulting object file with GPIB obj supplied by CEC include lt ms c488 h gt include lt stdio h gt include lt stdlib h gt include lt string h gt include lt time h gt define sr630 19 GPIB address for thermocouple function prototypes void InitGpib void void TxCGpib int char void GetGpib int global variables char recv 40 int status length void main void int i chan units double value char string 20 time t a b InitGpib TxGpib sr630 rst unit1 abs unit2 cent unit3 fhrn reset sr630 ch 1 units Kelvin ch2 Centigrade ch 3 Fahrenheit Thermocouple Reader EN 2 Program Examples N TxGpib sr630 bclr dwelt0 datm2 clear buffer 10 second dwell time brief ascii logging for i 4 i lt 17 i disable scans for all other channels sprintf string scne9ed NO I TxGpib sr630 string j TxGpib sr630 scant enter scan mode scan for 75 seconds time
34. aced in scan mode Lost record by re entering scan mode 1 2 3 4 Scan enabled for channels of interest eeu Miscellaneous problems Key pad does not work GPIB Lockout press EXC to go to LOCAL Does not scan Scan Enable off on all channels Does not retain settings when turned off or loses time and date settings replace lithium battery inside unit on main PCB Instrument is hung RAM may be corrupted try a cold boot by holding down the BKSP backspace key while turning the unit ON This will reset the instrument to its default state including GPIB address and RS232 baud rate factory calibration values are recalled from ROM and the time and date will need to be reset Error List Error O Attempt to read empty log Error 1 Memory checksum error Error 2 No channels selected in scan mode Error 3 Recalled set up corrupted Error 4 Problem reading logged data Error 5 Printer time out error Error 6 Command syntax error Error 7 Range error Error 8 Communications buffer overflow Thermocouple Reader N 15 Computer Interfaces WE Remote Programming The SR630 Thermocouple Reader may be programmed remotely through either GPIB IEEE 488 or RS 232 interfaces Any computer supporting these interfaces may be used to control and read data from the SR630 The SR630 supports both the IEEE 488 1 1978 interface standard and the required common commands of the IEEE 488 2 1987 Standard
35. acitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Capacitor Ceramic 50V 80 20 Z5U AX Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Cap Monolythic Ceramic 50V 20 Z5U Components Part List REF C 658 C 659 C 660 C 661 C 662 C 663 C 664 C
36. amp a do time amp b while difftime b a 75 TxGpib sr630 scan0 turn off scan printf Channel 1 K Channel 2 C Channel 3 F n for i 0 i lt 21 i now read measurements from buffer and print out in columns sprintf string rlog d 1 i want the ith reading TxGpib sr630 string GetGpib sr630 sscanf recv 9ed 9ed 9elf amp chan amp units amp value printf 6 3lf value If i 3 2 printf n ia kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkxk void InitGpib void initialize the CEC GPIB card as controller int my address system controller seg Find the CEC card address for seg 0x4000 seg lt 0xF000 seg 0x400 d if peek seg 50 C amp amp peek seg 51 EI amp amp peek seg 52 C break 2a Model SR630 eee program Examples if pc488_seg seg printf No Gpib Card found n exit 0 my_address 21 system_controller 0 initialize amp system_controller amp my_address transmit amp status IFC UNT UNL REN DCL t kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk sj void TxGpib int address char command transmit command to address char t string 100 int result result sprintf t string UNT UNL MTA LISTEN d DATA s 10 address command transmit amp status t string rd kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
37. andard event status byte If the parameter i is present the value of bit i is returned Reading this register will clear it while reading bit i will only clear bit i Thermocouple Reader N 1 Command List Bi 7 7___ PSC i The PSC common command sets the value of the power on status clear bit If i 1 the power on status clear bit is set and all status and enable registers are cleared on power up If j 0 the bit is cleared and all the status and enable registers will retain their values on power down This allows the unit to send a service request on power up RST The RST command returns the SR630 to the default configuration This command is equivalent to doing a RCL 0 from the front panel SRE The SRE common command sets the serial poll enable register to the value i STB i The STB common query reads the value of the serial poll byte If the argument i is present the value of bit i is returned Reading this register has no effect on its value as it is a summary of the other status registers Status Byte Definitions Serial Poll Status Byte bit name usage 0 OVRG Overrange error Query overrange status register to determine channel s 1 RLOG error No data in RLOG buffer when queried 2 HLOG timeout The SR630 timed out while waiting to send back RLOG data Timeout length is 65 5 seconds 3 OPEN Open circuit error Query OPEN status register to determine channel s 4 MAV The GPIB outpu
38. ardware Misc Hardware Misc Termination Hardware Misc Screw Misc Hardware Misc Wire 18 UL1015 Strip 3 8 x 3 8 No Tin Screw Black All Types Cable Assembly Ribbon Connector BNC Connector Female Cable Assembly Ribbon N Te nee aaa Te Ten ses a Model SR630 NI Components Part List REF Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 SRS part 1 00172 170 4 00541 435 9 00262 548 6 00003 61 1 00194 715 7 00257 720 7 00258 720 7 00384 709 7 00386 720 7 00387 721 7 00388 720 7 00389 720 00397 740 7 00680 720 9 00267 917 9 00552 924 VALUE 9535 130V 1200A 01U AXIAL BA 3AG PS300 38 SR560 20 SR560 26 SR630 1 SR630 9 SR630 10 SR630 11 12 SR630 13 14 SR630 PS300 52 GENERIC COPPERFOIL 1 Miscellaneous Parts List REF U 101 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 SRS part 3 00229 342 0 00150 026 0 00179 000 0 00180 000 0 00185 021 0 00204 000 0 00248 026 0 00326 026 7 00122 720 00217 735 7 00259 720 7 00260 720 VALUE 2 256 200 4 40X1 4PF RIGHT FOOT LEFT FOOT 6 32X3 8PP REAR FOOT 10 32X3 8T RUSSP 8 32X1 4PP DG535 36 PS300 40 SR560 28 SR560 27 DESCRIPTION Cable Assembly Multiconductor Varistor Zinc Oxide Nonlinear Resistor Capacitor Ceramic 50V 80 20 Z5U AX Fuse Bracket Fabricated Part Fabricated Part Lexan Overlay Fabricated Part Machined Part Fabricated Part Fabricated Part Keypad Conduct
39. ating voltage by orienting the printed circuit board Press the circuit board firmly into its slot so the desired voltage is visible Rotate the fuse pull lever back into its normal position and insert the correct fuse into the fuse holder Line Fuse Verify that the correct line fuse is installed before connecting the line cord to the unit For 100 V and 120 V use a 1 2 Amp fuse and for 220 V and 240 V use a 1 4 Amp fuse Line Cord The SR630 has a detachable three wire power cord with a three contact plug for connection to both the power source and protective ground The protective ground connects to the accessible metal parts of the instrument to ground To prevent electrical shock always use a power source outlet that has a properly grounded protective ground contact Power Up All instrument settings are stored in nonvolatile memory RAM backed up and are retained when the power is turned off They are not affected by the removal of the line cord If the power on self test passes the unit will return to the settings in effect when the power was last turned off If an error is detected or if the backup battery is exhausted default settings will be used Use in Biomedical Applications Under certain conditions the SR630 may prove to be unsafe for applications involving human subjects Incorrect grounding component failure and excessive common mode input voltages are examples of conditions in which the instrument
40. circuit A rear panel BNC provides a switch closure when there is an alarm condition or when the unit is turned OFF o O Model 56620 NI ron Panel Description Displays The front panel has three display windows Generally the left display indicates the selected channel the middle display an instrument or channel parameter value e g GPIB address or temperature alarm limits and the right display the measured value in the appropriate units Channel Select and Scanning Mode The CHANNEL up down buttons select one of sixteen rear panel inputs Pressing the up and down buttons simultaneously causes the instrument to begin scanning selected channels A channel is selected by setting its SCAN ENABLE parameter to yes In scan mode the SCANNING LED will be lit and selected channels will be read as rapidly as possible beginning with the lowest channel number f a printer is hooked up scan data will be printed in either List or Graph mode at the end of the run The DWELL TIME 10 to 9999 seconds sets the time between the start of subsequent scans Name Description GPIB ADD RS232 BAUD Instrument The rear panel analog outputs will be updated only when the corresponding channel is scanned or displayed manually Printer activity stops when scanning is stopped Parameter Select PARAMETERS are selected for display and modification using the parameter up down keys These parameters are listed in Table 1 The fi
41. conds may be viewed or modified by selecting the DWELL parameter The dwell time may be set from 10 to 9999 seconds The new dwell time will take effect when the EXC key is pressed or when a PARAMETER SELECT up down key is pressed See Scan Enable in channel parameter description When a scan is started data will be stored in non volatile memory with time and date stamps This data buffer is large enough to hold 2048 measurements When the buffer is full the logger will either stop or begin to overwrite roll over the oldest data depending on the mode setting The logging mode will appear in the MEASUREMENT window as either StoP or rOLL when the DWELL parameter is selected The YES NO key the minus sign on the PARAMETER ENTRY key pad may then be used to change the logging status This change takes effect immediately Note Beginning a scan from the front panel will automatically start storage of data from the first memory location in the data buffer cf remote programming Setting Channel Parameters Eight parameters may be set for each of the 16 channels Parameter settings for each channel are independent of the settings for all the other channels For example UNITS nominal temperature and alarm limits may be set to different values for each channel The setting of the channel parameters is detailed below To set these parameters for any particular channel first select the channel 1 to 16 by using the CHANNEL SELECT u
42. d alarms may also be enabled via the STROBE latch Setting the MSB of the strobe latch low for a few periods of the RTI will generate a keyclick sound holding this bit low will generate a 600 Hz tone for alarms If the CPU stops refreshing the STROBE latch contents the output enable on all the LED segment lamp and strobe latches will be disabled turning off all the LEDs and the audio transducer Analog Outputs and Reference Junction Temperature TC3C Sheet 3 of 6 There are four S H channels which are refreshed by a 12 bit DAC to provide the rear panel analog outputs The eight bit DAC MPX latch controls the channel to be refreshed and holds the 4 LSBs to be loaded into the DAC when the DAC STB is asserted The four S H s have gain of x4 buffers to drive the rear panel analog outputs These outputs have a 10 0 Vdc range a sub ohm output impedance and are stable driving cables and capacitive loads The 12 bit DAC is also used to digitize the block temperature sensor The comparator bit for each temperature transducer is inspected just prior to refreshing the next channel If the comparator bit read with the CS TEMP strobe is high the 12 bit value for the corresponding channel is decremented if the comparator bit is low the 12 bit value will be incremented This will cause the DAC output to track the voltage of interest with a resolution of 0 36 mV yielding a temperature resolution of 0 02 sa Model SR630 WR Circ
43. d by the CPU Bits 1 and 3 on the printer connector are protected against accidental connection to an RS232 device So Model SR630 WR Circuit Description The RS232 port is configured as a DCE data communications equipment and is programmed for 8 data bits 2 stop bits and no parity The default baud rate is 9600 bits per second but may be set from 150 to 9600 baud The RS232 port may be connected directly to a PC s COM port using a standard serial cable Front Panel Display TCOB Sheet 1 of 1 The front panel PCB is a time multiplexed 11 digit 26 lamp 21 key user interface The program s RTI changes display data 600 times a second with 6 column strobes this means the entire display is refreshed every 10 ms A column of lamps keys or a pair of digits is accessed by pulling one strobe line STBO 5 high Selected LEDs are turned on by setting the corresponding bits LAMPO 3 low or by pulling down the appropriate segment bit in the digit display A key press will cause one of the input lines KEYO 3 to go high Any key seen in the same state for several RTI s will be considered valid Thermocouple Reader EMEN 37 Components Part List Main Board Paris List REF BT100 C 100 C 101 C 102 C 104 C 300 C 301 C 302 C 303 C 304 C 305 C 306 C 307 C 308 C 309 C 310 C 311 C 312 C 400 C 500 C 501 C 502 C 503 C 504 C 505 C 506 C 507 C 508 C 509 C 510 C 600 C 601 C 602 C 603 C 604 C 605 C 60
44. e set and are cleared by reading them or by executing the CLS command 0 O Model SR630 eee Command List Miscellaneous Commands OPEN i The OPEN query reads the open channel status register 16 bits A bit value of 1 signifies an open channel Each channel may be queried individually by specifying the proper bit bits 0 15 for channels 1 16 respectively or if no argument is used the status of all channels will be returned as a 16 bit integer Note this command only works when units of temperature are selected OVRG i The OVRG query reads the channel overrange status register A bit value of 1 indicates that a channel has exceeded its range limit e g input voltage gt 1 00V while on the mV scale The register contains 16 bits which may be queried individually or collectively as per the OPEN query ALMS i The ALMS query reads the alarm status register When an alarm condition is met the bit for the specified channel is set to 1 The 16 bits in this register may be queried with or without an argument as per the OVRG and OPEN queries Note For each of the three preceding commands querying a register will clear it while querying a specific bit will clear only that bit MPXM i The MPXM command is used to set i 1 or reset i 0 the multiplex mode In this mode of operation the relay for channel 16 is always enabled allowing the SR630 to serve as a 1 15 differential analog multiplexer so that any
45. e top All control functions and parameter settings may be set via the GPIB or RS232 interfaces The RS232 port is type DCE and may be attached directly to PCs by using a standard i e not null modem serial cable The RS232 baud rate may be set from the front panel to any standard speed from 150 to 9600 baud A Centronics compatible printer may be attached for data logging by using a standard PC parallel cable The printer interface supports two print modes LIST mode which lists the time date and temperatures or voltages for all channels selected to be scanned and a graphics mode which prints a strip chart recording of the selected channels with a new line printed every Dwell Time A line of text which details all instrument settings is printed whenever a print mode is selected Figure 2 SR630 Rear Panel Four rear panel analog outputs provide dc outputs in the range of 10 0 Vdc These outputs may be set to track the difference between the nominal and measured temperatures or voltages of the corresponding channel 1 through 4 for proportional temperature control or analog strip chart recording The analog voltage at these rear panel outputs is given by Vout 20 T Tnom Chart Spant If the output voltage is used to control a heater to maintain an object above ambient temperature the user should enter a negative chart span so that the output voltage will decrease reducing heater power as the measur
46. e will be displayed This test will be performed only when the UNITS selected for the channel is Degrees K C or F Input Amplifiers and ADC TC5C Sheet 5 of 6 Both the and inputs have identical input amplifiers The source resistance amplifier type gain control multiplexer and passive components are matched to cancel offset errors due to thermal emf s bias currents etc These amplifiers are chopper stabilized giving an input offset voltage of less than 5 uV and an input offset voltage of about 0 05 uV deg C A voltage clamp circuit prevents the input signal from exceeding the power supply voltages for the input amplifier This clamp circuit is not required for the input as the power supply s ground is referenced to the input Thermocouple Reader EN 35 Circuit Description I A dual channel 1 4 analog multiplexer sets the gain for both amplifiers Logic inputs to this multiplexer are opto isolated from chassis ground Amplifier gain is selected by the GAIN SEL A and B control lines which determine the amount of feedback returned to the inverting input The protection network clamps the inverting input to 4 Vdc The TND907 diodes essentially 1N4148s in a chip package in series with the Zener diodes isolate the inverting input from the low impedance and high capacitance of the Zeners The Zeners are biased on to reduce capacitive effects The back to back diodes between the inverting and non inv
47. ed temperature increases If desired the analog outputs may also be configured via remote programming as simple voltage sources in the range 10V The 16 differential inputs to the SR630 are also located on the rear panel Each input floats with respect to chassis ground and has a 10 MO resistance between the and terminals Thermocouple Reader EMEN 1 1 Instrument Operation I Connecting Thermocouples Thermocouples may be connected to the instrument by removing the thermal shield on the rear panel This shield is important for accurate temperature measurements and should be replaced after the thermocouples are attached TypeB E J K R Sor T thermocouples may be used The thermocouple type must be specified for each channel either by front panel entry or via one of the computer interfaces Setting Instrument Parameters Six parameters affect the entire instrument while eight are channel dependent Instrument parameters are GPIB address RS232 baud rate printer mode dwell time logging mode time and date Channel parameters are units volts or temperature scan enable thermocouple type nominal temperature or voltage chart span alarm enable and alarm limits max min Parameters are selected with the PARAMETER SELECT up down keys Once selected the current parameter value will be displayed some parameters such as UNITS become effective as soon as the key is pressed Others like GPIB address or t
48. erting inputs of the amplifier turn on if the input exceeds 4 7 V Input current is limited by a 10 kO 1W resistor These diodes do not leak as the voltage across them in normal operation is the input offset voltage less than 5 uV A dual slope integrating Analog to Digital Converter is used to digitize a signal to 15 bits plus sign The ADC converter looks differentially between the amplified and inputs The converter continually cycles through the various phases of A D conversion autozero integrate de integrate and reset The ADC requires 4 x 1280 clock cycles to complete a full cycle The clock frequency is set by the CPU so that the integrate phase is exactly one cycle of the line frequency either 50 or 60Hz By doing this any line frequency noise will average to zero during the integrate phase greatly reducing the ADC susceptibility to line frequency noise and its harmonics The result of the A D conversion is available for about 20 ms after the falling edge of the ADC BUSY bit This bit is polled by the CPU during the RTI when it is seen to go low the CPU will read data and status bits from the ADC by reading the bits into the 74HC165 shift register These bits are then clocked to the CPU via the opto isolator with the same clock that is used by the ADC Overload And Underload Detection Four comparators look at the amplified input signal to maintain the optimum gain setting for the input amplifie
49. generating baud rate ADC and real time interrupt clocks The CPU may be interrupted non maskable by the RTI real time interrupt During this interrupt the next row of LEDs is refreshed the next row of keyboard lines is read and the ADC s busy bit is read data will also be read if the ADC BUSY just went low Various other tasks such as updating the TIME and DATE as well as changing to the next channel if scanning will also be handled during the RTI The CPU may also be interrupted by either the UARTs RXRDY receiver data ready bit or the GPIB interrupt These interrupts are wire or ed to the maskable interrupt input INT The CPU determines the interrupting source by interrogating the status registers in the UART and GPIB controllers A 32Kx8 EPROM mapped to the bottom of the 64K memory space is used to store program memory and factory calibration constants A battery backed up 32Kx8 CMOS RAM mapped to the upper 32K stores program data instrument settings and current calibration values The CPU verifies the integrity of the RAM contents on reset if the RAM is corrupted then it will be initialized to default settings and factory calibration values This initialization will also be done if the BKSP key is held down when the unit is turned ON The active calibration bytes which are stored in the RAM may be altered by the user via a special front panel operation mode This mode will only be available if the CAL
50. gular LED Rectangular LED Rectangular LED Rectangular LED Rectangular Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Diode Diode Diode Connector Male Connector Male Connector Male Connector BNC Connector BNC Connector BNC Connector BNC Components Part List REF J 700 J 701 J 702 JP100 JP700 PC1 PC2 PC3 Q 101 Q 102 Q 200 Q 201 Q 202 Q 203 Q 204 Q 205 Q 206 Q 501 Q 600 Q 604 R 100 R 101 R 102 R 103 R 104 R 105 R 106 R 108 R 109 R 110 R 111 R 200 R 201 R 202 R 203 R 204 R 205 R 206 R 207 R 208 R 209 R 210 R 211 R 212 R 213 2 LLLLLTU OLGGGSGIGGGGGLL Model SR630 SRS part 1 00238 161 1 00016 160 1 00016 160 1 00045 130 1 00038 130 7 00371 701 7 00370 701 7 00372 701 3 00021 325 3 00021 325 3 00022 325 3 00022 325 3 00022 325 3 00022 325 3 00022 325 3 00022 325 3 00022 325 3 00022 325 3 00026 325 3 00026 325 4 00048 401 4 00034 401 4 00027 401 4 00022 401 4 00034 401 4 00034 401 4 00034 401 4 00034 401 4 00027 401 4 00032 401 4 00057 401 4 00048 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 4 00081 401 VALUE GPIB SHIELDED RS232 25 PIN D RS232 25 PIN D 3 PIN STRAIGHT 40
51. hort circuit should be placed on channel 16 s input After the unit has warmed up for at least 1 2 hour press both the TEMP and BKSP keys simultaneously to access the offset calibration routine With the display showing cL oFFS All press the EXC key to start the offset calibration routine The numbers 1 to 8 should appear on the right most display as the offset value is determined for each gain range Offsets are nulled to within 1 LSB of the displayed voltage by this routine i e to within 1 u V of zero on the 30 mV scale The offset for a single gain range may be calibrated also by selecting the range 1 8 with the channel select keys and pressing EXE Gain Factors There are gain errors associated with the input attenuator the amplifier and the ADC The gain errors are independent of the selected channel because the multiplexer relays resistances are very much less than the 10 MOhm input impedance To correct for these gain errors Known voltages will be applied to channel 15 and read by the ADC A calibration constant will be determined for each of the eight gain ranges which will be used to correct subsequent measurements After the unit has warmed up for at least 1 2 hour press both the TEMP and BKSP keys simultaneously to access the gain calibration routine The display will show cL oFFS ALL Press the PARAMETER SELECT A up arrow to change the display to read cL gAin 0 03 Now apply 30 000 0 005 mV to chan
52. ime and date become effective only after the EXC key is pressed or when another parameter is selected This allows editing of entered values from the front panel before they take effect The BKSP backspace key may be used to delete entered values Backspacing through all the entered values for a new parameter will cause the previous value of that parameter to appear The LED indicator for a parameter will blink when a new value is entered until that value takes effect All parameters may be set or read via the front panel or computer interfaces All parameters except for GPIB address RS232 baud rate time and date may be stored and recalled Nine settings 1 9 may be stored at any one time RCL O will restore default settings GPIB Address The GPIB address may be changed by entering a number from 0 to 31 The default GPIB address for the SR630 is 19 The new GPIB address will take effect when the EXC key is pressed or when a PARAMETER SELECT up down key is pressed RS232 Baud Rate The RS232 baud rate for serial communications between the SR630 and a computer may be set by selecting the RS232 BAUD parameter The current RS232 baud rate will be displayed in the PARAMETER window A new value of 150 300 600 1200 2400 4800 or 9600 baud may be entered The new RS232 baud rate will take effect when the EXC key is pressed or when either PARAMETER SELECT key is pressed Date The date may be displayed or modified by
53. ion To Channel 8 temperature offset access calibration values press the TEMP and Channel 9 temperature offset BKSP keys simultaneously If the message no Channel 10 temperature offset CAL JPr appears then the calibration jumper is in Channel 11 temperature offset the disable position Channel 12 temperature offset Channel 13 temperature offset The unit should be on for at least 1 2 hour prior to Channel 14 temperature offset calibration Typically input offset voltages on the Channel 15 temperature offset order of 10 uV will appear in the first few minutes Channel 16 temperature offset of operation 1 output voltage offset Calibration constants may be changed directly or 42 output voltage offset in the case of offsets and gains modified by 3 output voltage offset firmware calibration routines These routines are 4 output voltage offset also accessed by pressing the TEMP and BKSP keys together Thermocouple Reader EN 20 Calibration I Input Offset Calibration Values A firmware calibration routine is used to null the input offset voltage for each of the 8 voltage ranges These offsets are expressed in ADC bits with a range of 128 to 127 expected offsets are about 10 20 bits The offset calibration constant represents the number which is to be subtracted from the ADC value such that 0 00 is reported for the voltage of a shorted input Increasing these calibration constants will decrease the reported voltage A s
54. ion typical values range from O to 100 uV C Unfortunately the magnitude of the coefficient depends on temperature It is generally smaller at low temperatures and may change by more than a factor of two over the useful operating range of a thermocouple Despite this non linearity the induced voltage is usually a monotonically increasing function of temperature and the voltages generated by certain pairs of dissimilar metals have been accurately tabulated These tabulated values are referenced to the voltage seen across a junction at 0 C A problem arises when one tries to measure the voltage across the dissimilar metal junction two additional thermocouple junctions are formed where the wires are attached to the voltmeter Figure 4 illustrates this problem If the wires leads which connect to the voltmeter are made of alloy C then thermal emf s exist at the A C and B C junctions There are two approaches to solving this problem use a reference junction at a known temperature or make corrections for the thermocouples formed by the connection to the voltmeter Junction Temperature T Unintended Junctions Figure 4 Measuring Thermocouple Voltage Creates Two Additional Junctions Figure 5 shows the use of a reference or compensating junction With this arrangement there are stil two additional thermocouple junctions formed where the compensated thermocouple is connected to the voltmeter However the junctio
55. ive Rubber Fabricated Part Product Labels Tape All types DESCRIPTION EPROM PROM I C Screw Black All Types Hardware Misc Hardware Misc Screw Panhead Phillips Hardware Misc Screw Black All Types Screw Black All Types Fabricated Part Injection Molded Plastic Fabricated Part Fabricated Part Thermocouple Reader N 4 Components Part List Di _ 7__ 5o nn Model SR630
56. kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk Wi void GetGpib int address get an answer from device at address char r_string 40 temp 80 sprintf r string UNT UNL MLA TALK 96d address transmit amp status r string strcpy temp i receive amp status amp length temp if status 8 printf Timeout error n exit 0 strcpy recv temp kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk Wi Thermocouple Reader N 25 Thermocouple Reference Data BEEN NNI It was observed a long time ago Seebeck 1822 that a voltage exists across the junction of dissimilar metals Figure 3 shows a thermocouple junction formed by joining two metallic alloys A and B The voltage across the thermocouple junction depends on the type of metals used and the temperature of the junction The mechanism responsible for this voltage is quite complicated but certain characteristics associated with this phenomenon make the junction useful for measuring temperature Junction Temperature T C Figure 3 A Thermocouple Junction of Alloys A and B The most important characteristic is that the voltage generated is approximately linear with temperature The change in junction voltage as a function of junction temperature is given by eq 1 AV axAT where a is the Seebeck coefficient The magnitude of this coefficient depends on the types of metals used to form the junct
57. lect centigrade scale by pressing the number 7 on the PARAMETER ENTRY key pad Then select TC TYPE from the parameter list and set the thermocouple type to K by pressing the number 3 4 The temperature in degrees centigrade should be displayed in the MEASUREMENT window Warming the thermocouple with your fingers should cause the temperature to rise if the reported temperature goes down then the thermocouple was probably attached with the wrong polarity Remember the red lead is negative for the US positive for European standards Type K thermocouples have a standard limit of error of 2 2 C Type K thermocouples supplied by SRS have special limits of error of 1 1 C Thermocouple Reader N 7 Instrument Description I GPIBADO RS232 BAUD UNITS DATE m d y TIME hr min SCAN ENA PRINTER DWELL sec TC TYPE Tnom STO A A T Tnom ES CHART SPAN AL PARAMETER ENABLE T ma X T min ALARM v Figure 1 SR630 Thermocouple Reader Instrument Overview The Model SR630 is a 16 Channel computing microvoltmeter The unit can digitize 16 rear panel differential inputs with a resolution of 15 bits plus sign Gains and offsets are controlled to microvolt levels The dual slope integrating converter is synchronized to the line frequency for high noise immunity The unit completes 10 12 conversions per second when used on a 50 60 Hz line The unit determines the temperature of a thermoco
58. m 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 0 1 25ppm Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 0 1 25ppm Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1
59. matted for 999 9 to 9999 degrees or 9 999 mV 99 99 mV 999 9 mV 9 999 V or 99 99 V Minus signs are displayed but plus signs are omitted on all displays Selected units for each channel are indicated on the units indicators just to the right of the display Status Indicators otatus indicators are located above the power switch These LEDs indicate the various conditions detailed in Table 3 REMOTE GPIB Remote state Press EXC to go to LOCAL GPIB Turns on for any GPIB activity and stays on until end of record RS232 Turns on for any RS232 activity and stays on until end of record Turns on when data sent to printer ERROR Red LED for command parameter or printer errors PRINTER Table 3 Status Indicators 10 LLILI LILILL ICISCSLGSI Mode SR630 eee Gear Panel Description IEEE 488 Std Port GPIB RS232 DCE 8d 0p 2s Analog Centronics Printer Port Analog Outputs Vout 10V T Tnom Span WARNING No user serviceable parts inside Refer to operation manual for safety notice For use by qualified laboratory personnel only Fuse 1 2A 100 120V 1 4A 220 240V O SSBSQROSSGORUDSDSGOSSTOUSOHOPDORADDGHOS mama The rear panel of the instrument is shown in Figure 2 The thermal shield has been removed by unscrewing the thumbscrews on either end of the shield The printer port GPIB IEEE 488 compatible and RS232 interfaces are located along th
60. may expose the subject to large input currents Therefore Stanford Research Systems does not recommend the SR630 for such applications Furnished Accessories Power cord Operating manual Environmental Conditions OPERATING Temperature 4 10 C to 40 C Specifications apply over 18 C to 428 C Relative Humidity 9096 Non condensing NON OPERATING Temperature 25 C to 65 C Humidity 9596 Non condensing Thermocouple Reader EN 5 Symbols you may find on SRS products Symbol Description CN A Caution risk of electric shock A Frame or chassis terminal A Caution refer to accompanying documents l Earth ground terminal Gope o o Alternating current Lb Off supply eee LL I SR630 eee Quick Start Instructions 1 Remove the rear cover thermal shield and attach a K type Chromel Alumel thermocouple to channel 1 s input on the rear panel One such thermocouple has been provided with the unit The red lead should be connected to the negative input and the yellow lead to the positive input These are US color codes Replace the thermal shield 2 Verify that the power entry module on the rear panel is set for the voltage in your area Using a three wire power cord connect the unit to line power 3 Press the POWER button to turn the unit ON Use the CHANNEL SELECT keys to select channel 1 Use the PARAMETER SELECT keys to select UNITS from the parameter list Se
61. ned or skipped Proportional Outputs Printer Output Data Memory General Store and Recall For Channels 1 2 3 and 4 10V Voltages Temperatures Time and Date as a list or in a graphical format Last 2048 measurements in battery backed up memory Nine locations for instrument set up Interfaces RS232 GPIB and Centronics Printer Standard All instrument functions controllable via RS232 or GPIB Power 100 120 220 240 Vac 50 60 Hz Rack Mount Optional Dimensions 8 5 x 3 59 x 18 WxHxD Weight 9 lb All specifications apply for 18 C to 28 C operation a A Model SR630 ee Preparation for Use xxx C AUTIO NA See This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR card set for the wrong ac line voltage or if the wrong fuse is installed Line Voltage The SR630 can operate from a 100 V 120 V 220 V or 240 V ac power source having a line frequency of 50 or 60 Hz Before connecting the power cord to a power source verify that the LINE VOLTAGE SELECTOR card located in the rear panel fuse holder of the unit is set so that the correct ac input voltage value is visible Conversion from one ac input voltage to another requires a change in the fuse holders LINE VOLTAGE SELECTOR card position and a new fuse Disconnect the power cord slide the fuse holder cover to the left and rotate the fuse pull lever to remove the fuse Remove the small printed circuit board Select the oper
62. nel 15 and press the EXC key to calibrate the 30 mV voltage scale Press the CHANNEL SELECT A up arrow key to change the display to cL gAin 0 1 Apply 100 00 0 01 mV to the channel 15 input and press the EXC key to calibrate the 100 mV scale Repeat for the remaining ranges by pressing the CHANNEL SELECT A key applying the full scale voltage indicated in the MEASUREMENT display and pressing the EXC button Applied Voltage 30 000 0 003 mV 100 00 0 01 mV 300 00 0 03 mV 1 000 0 0001 V 3 000 0 0003 V 10 00 0 001 V 30 00 0 003 V 0 0 01 V Temperature Calibrations To obtain the temperature from a voltage measurement we need to measure the temperature of the reference junction This is the thermocouple junction formed where the thermocouple wires connect to the rear panel terminal strip There is a semiconductor temperature sensor located in the center of the metal block behind the terminal strip Unfortunately the sensor which provides a voltage of 10 mV per degree F has an error of about 1 F and so must be calibrated Calibration constant 17 is used to correct for the sensor s error Knowing the correct temperature of the reference junction allows the microprocessor to subtract the emf generated by this junction from the measured voltage in order to determine the emf of the thermocouple junction of interest 20 R oae SR630 en Calibration To calibrate the semiconductor sensor attach a
63. ns are identical they are both junctions between alloys A and C If the junctions are at the same temperature then the voltage across each junction will be equal and opposite and so will not affect the meter reading Typically the reference junction is held at O C by an ice bath for example so that the voltmeter readings may be used to determine the temperature o MEN Model SR630 Ei Thermocouple Reference Data Junction AB C Ice Bath Figure 5 Using a Reference Junction to Compensate Thermocouple Not required for the SR630 The second approach to the problem depends on the fact that the voltage across the junction A C plus the voltage across the junction C B Fig 4 is the same as would be seen across a junction of A B The presence of an intermediate metal C has no effect as long as all the junctions are at the same temperature This allows us to correct for the voltage seen by the voltmeter in Figure 4 by measuring the temperature at the A C and B C junctions and subtracting the voltage which we would expect for an A B junction at the measured temperature In the SR630 the temperature of the A C and C B junctions are measured with a low cost high resolution semiconductor detector and the expected voltage is the tabulated voltage for the A B thermocouple at the measured temperature of the A C and C B junctions Type B E Positive Material Negative Material Pt Rh 30 Ni Cr PU Rh 696 Cu Ni Po
64. ommands There is no need to wait between commands The SR630 has a 256 character input buffer and processes commands in the order received If the buffer fills up the SR630 will hold off handshaking on the GPIB Similarly the instrument has a 256 character output buffer to store output until the host computer is ready to receive it If the output buffer is filled it is cleared and an error reported The present value of a particular parameter may be determined by querying the SR630 for its value A query is formed by appending a question mark 2 to the command mnemonic and omitting the desired parameter from the command If multiple queries are sent on one command line Separated by semicolons of course answers will be returned in a single response line with the individual responses separated by semicolons All GPIB responses are terminated with a linefeed and an EOI all RS232 responses are terminated with a carriage return and a linefeed lt cr gt lt lf gt Examples UNIT 12 CENT oet units for channel 12 to centigrade TTYP 12 K opecify K type thermocouple for channel 12 MEAS 12 Measure temperature of channel 12 Detailed Command List The four letter mnemonic in each command sequence specifies the command The rest of the sequence consists of parameters Multiple parameters are separated by commas Commands that may be queried have a question mark in parentheses after the mnemonic The parentheses are not
65. ont panel simultaneously This mode of operation may also be activated via the GPIB or RS232 interfaces by using the MPXM 1 command The mode is disabled with the MPXM 0 command or whenever the unit is turned off Note the relays will stay in their activated positions on power down and remain so until reset upon power up Once the multiplex mode is selected a channel may be selected from either the front panel or by the computer O vos sno N Troubleshooting Unit does not turn ON 1 Power cord and line voltage 2 Fuse blown 3 Power entry module set for local voltage Does not read voltages correctly Wrong channel selected Rear panel connections shorted or loose UNITS set incorrectly Defective internal relay try another channel Voltage greater than 100 V Time Date or Dwell displayed ac voltage present go KL Bear RM Aaa Does not read temperatures correctly in addition to voltage problems above Wrong thermocouple type specified Thermocouple and swapped Red Defective thermocouple Thermal shield not in place Outside temperature range for couple type ID Alarms not working 1 Alarm limits in correct units 2 Tmax set lower than Tmin 3 Channel not scanned 4 Alarm Enable turned OFF Printing problems Printer error Out of paper Printer off line Not scanning Wrong print mode ID I Logging problems Wrong mode selected Roll vs Stop Not pl
66. ouple wire varies from 0 8C to 4 4C depending on the type of thermocouple used H o T Pt Rh 13 Pt Rh 10 Cu Pt Pt Cu Ni Black Black Blue Red Red Red OC OC 200C 1450C 1450C 350C 1 4C 1 4C 0 8C Table 4 Thermocouple Reference Data Thermocouple Reader N 27 Thermocouple Reference Data BEEN NNI Voltage vs Temperature measurements have been tabulated by NIST for each of the seven standard thermocouple types These tables are stored in the read only memory of the SR630 Thermocouple Reader The instrument s microprocessor interpolates between the table entries in order to achieve 0 1 C resolution when converting a voltage measurement to a temperature The K type thermocouple is recommended for most general purpose applications it offers a wide temperature range low standard error and has good corrosion resistance The K type thermocouples provided by SRS have a standard error of 1 1C half the error designated for this type 0 MEN Model SR630 en Calibration Overview Locations of Calibration Constants There are two areas of concern in the calibration of the SR630 its performance as a microvoltmeter 1 Voltage offset for 30 mV range and its performance as a thermocouple reader To 2 Voltage offset for 100 mV range achieve a high degree of accuracy as a 3 Voltage offset for 300 mV range microvoltmeter we need offset and gain 4 Voltage offset for 1V range calibrations For high accuracy as a thermocou
67. p down keys Then select the channel parameter of interest with the PARAMETER SELECT up down keys The PARAMETER ENTRY keypad may be used to modify the displayed parameter Measurement Units Display units for a measurement may be set when UNITS is selected in the parameter list Degrees Kelvin absolute centigrade Fahrenheit volts or millivolts may be selected by pressing the corresponding key along the top row of keys in the PARAMETER ENTRY section Selected units become effective immediately Units are indicated by an indicator to the right of the MEASUREMENT window and are abbreviated in the PARAMETER window Scan Enable A channel will be read during scanning if the SCAN ENABLE parameter is set to YES To read or modify the scan enable status select SCAN ENABLE from the list of channel parameters The YES NO key the minus sign on the PARAMETER ENTRY keypad may be used to change the scan enable status Scan enable status takes effect immediately TC Type The SR630 supports 7 different thermocouple types For details and characteristics of these thermocouples see the Thermocouple Reference Data section To display or modify the thermocouple type for a selected channel select TC TYPE from the list of parameters The TC TYPE is displayed in the PARAMETER window as a single digit number O to 6 B 0 E 1 J 2 K 3 R 4 S 5 T 6 as indicated on the parameter entry keypad For example pressing 3 when the TC T
68. ple 5 Voltage offset for 3V range reader we need to accurately determine the 6 Voltage offset for 10 V range reference junction temperature Voltage offset for 30 V range 8 Voltage offset for 100V range The hardware has been designed to minimize the sources of error Inputs are treated in a fully Gain constant for 30 mV range differential manner the input amplifiers are Gain constant for 100 mV range chopper stabilized and the reference junction Gain constant for 300 mV range zone box is well isolated and thermally massive Gain constant for 1V range Additionally a small semiconductor sensor is Gain constant for 3V range implanted in the box to accurately measure the Gain constant for 10V range reference junction temperature Small remaining Gain constant for 30V range errors are canceled by firmware using final test Gain constant for 100V range calibration values Temperature offset of connector block The factory calibration values are burned in EPROM these values are moved to battery Channel 1 temperature offset backed up RAM when the unit is turned ON for Channel 2 temperature offset the first time or if the BKSP key is held down Channel 3 temperature offset during power up Channel 4 temperature offset Channel 5 temperature offset Calibration values may be changed from the front Channel 6 temperature offset panel if the calibration jumper on the main PCB Channel 7 temperature offset inside the unit is in the enable posit
69. r If the OVERLOAD bit is set the gain is reduced and the result of the next ADC read is ignored even if the ADC result does not indicate an overflow If the UNDERLOAD bit is set the gain is increased The next ADC result corresponds to the input before the gain was increased and this result may be used Power Supplies TC6C Sheet 6 of 6 The unit uses full wave bridge rectifiers and linear regulators to produce 5 15 chassis ground referenced and 5 floating supplies Floating supplies are referenced to the input of the selected input channel A power entry module fuses filters and configures the primary taps of the power transformer for 100 120 220 or 240 Vac 50 60Hz operation The line frequency is filtered and discriminated to the logic signal LINE which is measured by the CPU on initialization to determine the appropriate ADC clock frequency A reset circuit generates a RESET on power up or power down This RESET also inhibits writes to RAM until after the power supplies have settled Computer Interfaces TC7B Sheet 1 of 1 A 40 pin connector connects the computer printer interface PCB to the main PCB The interface PCB has GPIB RS232 and printer interface components The pinout of the connector is such that no damage will be done if the connector is plugged in backwards Either the GPIB controller or RS232 UART may interrupt the processor to request service The printer status must be polle
70. r disables i20 the scanning and logging mode Note Unlike starting a scan via the front panel the SCAN 1 command does not reset the buffer counter NPTS each time so successive scans may be run without losing old data Data may be cleared with the BCLR command DATM i The DATM command selects the logging data mode of the 630 Options for i are O0 ASCII mode 2 Brief ASCII Mode see RLOG below BUFM i The BUFM command determines whether the 630 will stop logging data i20 or begin overwriting the oldest data i21 when the buffer is full If the buffer mode is changed after taking data a BCLR is highly recommended to prevent possible overwrite problems 18 LLILLLLIIILOILGGOSOLIAGISU modei SR630 ee Command List BCLR The BCLR command clears the data buffer and stops logging measurements NPTS The NPTS query returns the number of measurements stored in the logging buffer The maximum number of readings stored is 2048 RLOG i j Read j measurements in the logging buffer beginning with item i The maximum value of i is 2047 maximum for is 2048 i or NPTS ASCII data has the format Chan Units 0 ABS 1 CENT 2 FHRN 3 mDC 4 DC measured value Month Day Year Hr Min Sec lf Brief ASCII omits time and date values RLOG queries sent as part of a multiple command line will not be returned with delimiters but will be separated by a lf Note Although multiple measurements may
71. rect offset errors on the rear panel analog outputs To calibrate these offsets we will set the rear panel outputs to zero measure the actual output voltage compute the correction to the calibration constant by dividing the actual offset by 0 005 V and subtracting this correction to the present calibration constant To set the rear panel outputs to zero configure channels 1 through 4 for UNITS mV and CHART SPAN 100 Place a short on channels 1 through 4 Use the CHANNEL SELECT keys to select channel 1 Measure and record the output voltage on the rear panel BNC 1 Repeat for channels 2 3 and 4 by first selecting the channel then measuring the corresponding output Compute the required correction to each output s offset calibration constant by dividing the observed offset by 0 005 The offset may be corrected in 5 mV increments These corrections will be subtracted from the corresponding calibration constant per the table in the preceding section Thermocouple Reader EBENEN 31 Calibration I For example if the voltage at the 41 BNC output is found to be 0 028 V then calibration constant 34 will be decreased by 0 028 0 005 which rounds to 6 To adjust calibration constant 34 press the TEMP and BKSP keys simultaneously so that the display shows cL oFFS ALL Then press the PARAMETER SELECT A up arrow key twice to display the first calibration constant See list in preceding section Then press the CHANNEL S
72. rst six are instrument parameters which may be modified regardless of the selected channel the rest are channel specific Store and Recall Store STO and Recall RCL keys are used to save and retrieve parameter settings for all channels not just a selected channel There are nine storage locations 1 9 and ten possible recall locations 0 9 To store recall location 7 press STO RCL 7 EXC Recalling location O will set the instrument to its default state GPIB interface address 1 31 RS232 baud rate 150 300 9600 baud DATE Month Day Year US Format Ex 12 31 1999 TIME Hours Minutes Seconds 24 Hour Format Ex 23 59 00 PRINTER Off List groh Off list or graphics DWELL Time between start of scans and buffer mode stop roll Each Channel UNITS SCAN ENABLE TC TYPE Select Degrees K C F mVdc or Vdc Select Yes or No for inclusion in scan list Thermocouple type B E J K R S or T Tnom Nominal temperature for this channel and chart center AT T Tnom CHART SPAN Measured deviation from nominal temperature Range of values for strip charts and analog outputs ALARM ENABLE Enable alarm if temperature exceeds limits Tmax Upper limit before alarm Tmin Lower limit before alarm Table 1 List of instrument and Channel Parameters Thermocouple Reader N o Front Panel Description I Channel Display channel 1 not scanning Parameter Display GPIB address Set parameters as follows GPIB A
73. selecting DATE m d y parameter Dates are entered and displayed in US format with O s So to set the date to September 1 1995 enter 09011995 The new date will take effect when the EXC key is pressed or when either PARAMETER SELECT key is pressed Time The SR630 clock may be displayed or modified by selecting the TIME hr min sec parameter Times are entered and displayed in a 24 hour format with O s E g To set the time to 30 seconds after 5 00 pm enter 170030 The new time will take effect when the EXC key is pressed or when either PARAMETER SELECT key is pressed Printer Mode There are three printer modes off list and graphical A printer may be used to log data of the scanned channels The list mode prints the time date and value of all scanned channels whenever a scan is completed The graphic mode produces a strip chart record on the printed output The range of values printed in the graphics mode is set by the CHART SPAN parameter To view or set the printer mode select PRINTER and use the PRT MODE key the decimal point key to toggle between print modes The new print mode will take effect when the EXC key is pressed or when a PARAMETER SELECT up down key is pressed aO vocc SR630 N Instrument Operation Scan Dwell Time and Data Logging The SR630 can scan any of 16 channels storing up to 2048 measurements with time and date stamps with or without printing The time between the beginning of scans in se
74. sitive Color USA Grey Purple Negative Color USA Red Red Lowest Temperature 50C 200C Highest Temperature 1700C 900C Minimum Std Error LA AC 1 7C The advantage of the second method which is used in the SR630 is that any thermocouple type may be used without having to change compensation junctions or maintain ice baths Characteristics of Thermocouple Types Any two dissimilar metals may be used to make a thermocouple Of the infinite number of thermocouple combinations which can be made the world has settled on seven types which exhibit a range of desirable features These thermocouple types are known by a single letter designation J K T E R Sor B While the composition of these thermocouples are international standards the color codes of the wires are not For example in the US the negative lead is always red while the rest of the world uses red to designate the positive lead Often standard thermocouple types are referred to by their trade names For example K type is sometimes called Chromel Alumel which are the trade names of the Ni Cr and Ni Al wire alloys Important criteria for a good thermocouple include a large stable Seebeck coefficient wide temperature range and good corrosion resistance Generally each wire of the thermocouple is an alloy Variations in alloy composition and the condition of the junction between the wires are sources of error in temperature measurements The standard error of thermoc
75. st applied The pulse which SETs or RESETs a relay is about 20 ms long A particular coil is turned ON by writing a 1 to the corresponding position in the 32 bit shift register The shift register is RESET by setting bitO of U400 low after 20 mS Break before make is used to avoid momentarily shorting two inputs together Data is shifted from the MSB of the DATA BUS into the 32 bit shift register There is a one bit queue which isolates the noisy data bus from the analog section U107B hence 33 clocks of the chip select RLY SHIFT are needed to fill the 32 bit shift register The input resistance of each channel is 10 MQ each channel terminates into its own 10 MO resistor when not selected and the 1 100 input attenuator provides a 10 MO resistance when the channel is selected Q2 of the RLY CTL latch controls the input attenuator On power on reset the attenuator divides the input signal by 100 and provides the attenuated signal via 100 kO source resistance to the input amplifier Setting Q2 high provides an unattenuated signal via 10 KO resistors to the input amplifier Q1 of the RLY CTL latch controls a reed relay which is used to test for open thermocouples A thermocouple is considered open if its resistance exceeds 1 kOhm To check this Q1 is set high to close the relay connecting a 2 50 Vdc source via a 10 kQ resistor to the output If more than a 250 mVdc change is seen at the input then the Open messag
76. t Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Diode Diode Diode Diode Diode Diode Diode Diode Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg N aae lS Tee au SS NY Tse Voltage Reg TO 220 TAB Package Voltage Reg TO 220 TAB Package Components Part List REF U 602 U 603 U 605 U 700 U 701 U 702 U 703 U 704 U 705 U 706 U 707 X 100 X 300 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 Z0 SRS part 3 001 14 329 3 00120 329 3 001 12 329 3 00645 340 3 00078 340 3 00079 340 3 00300 340 3 00263 340 3 00110 340 3 00493 340 3 00109 340 6 00095 620 6 00015 620 0 00014 002 0 00043 01 1 0 00050 01 1 0 00079 031 0 00081 032 0 00089 033 0 00096 041 0 00126 053 0 00128 053 0 00129 053 0 00187 021 0 00208 020 0 00231 043 0 00233 000 0 00237 016 0 00238 026 0 00243 003 0 00259 021 0 00284 0
77. t Parts List 38 Circuit Schematic Diagrams 51 Thermocouple Reader N Specifications i Voltmeter Specifications Channels Input Type Input Resistance Input Capacitance Input Bias Current Input Protection Full Scale Display Range Select Resolution Offset Gain Accuracy Conversion Rate Line Rejection 16 Independent floating and differential 10 MOhms between amp 1 GOhm to ground 001 uF 100 pA 250 Vrms 9 999 199 99 4999 9 mVdc 9 999 199 99 Vdc Automatic 1 of least significant displayed digit 2 of least significant displayed digit 0 05 10 Hz for 50 Hz line 12 Hz for 60 Hz line 100 1 Thermocouple Specifications Input Specifications are same as the Voltmeter Specifications Channels 16 Thermocouple Types B E J K R T Display Units Degrees C F and K Display Resolution 0 1 Degree C Temperature Displays Actual Nominal or Offset Open Check Current 250 uA Accuracy 0 5 Deg C for J K E and T 1 0 Deg C for R S and B Errors are for the SR630 only Standard errors for thermocouple wire are 2 to 5 times the error due to the SR630 See section on thermocouple reference data for additional information Scanning and Data Logging Functions Dwell Time 10 to 9999 seconds between successive scans Alarm Temperature or voltage limit for each channel Alarm Relay Rated for up to 1 amp and 100V DC AC 30W 60VA maximum resistive load Scan Enable Channel may be scan
78. t queue is non empty 5 ESB An unmasked bit in the standard status byte has been set 6 RQS MSS SRQ service request bit 7 ALRM An Alarm condition has been met Query ALMS register to determine which channel s The ESB bit is set whenever any unmasked bit i e one with the corresponding bit in the byte enable register set in the standard event register is set This bit will not be cleared until the condition which set the bit is cleared A service request will be generated whenever an unmasked bit in the serial poll register is set Note that service requests are only produced when the bit is first set and thus any condition will only produce one service request Accordingly if a service request is desired every time an event occurs the status bit must be cleared between events Standard Event Status Byte bit name usage 0 OPC Not used by the SR630 1 unused 2 Query Error Set on output queue overflow RCL command failed or RAM corrupted on power up reset to defaults 3 Device error 4 Execution Err Set by an out of range parameter or non completion of some command due to an error condition e g overload 5 Command Err Set by a command syntax error or an unrecognized command 6 URQ Not used by the SR630 7 PON Set by power on This status byte is defined by IEEE 488 2 1987 and is used primarily to report errors in commands received over communications interfaces The bits in this register stay set onc
79. uit Description Time and Date The time and date are maintained by a battery backed up clock and oscillator To write and address data to the IC the quad analog switch 74HC4066 is enabled by setting RTC_MPX high which connects the four LSB DAC bits to the IC The 74HC4066 is disabled when reading from the part Relay Multiplexers TC4C Sheet 4 of 6 There are 16 differential inputs which are multiplexed to a single input amplifier Each input is treated in a fully differential manner trace paths junctions relays and components for the and are all identical Relay multiplexers and a floating ADC section are required to meet the 200 V common mode range specification The floating analog ground for the ADC section is referenced to the negative input of the selected channel Latching Relays Latching DPDT relays with bifurcated contacts are used in the input multiplexer Because these relays are switched with a low duty cycle pulse they will not warm up and the double throw action allows termination of the input into a constant 10 MO impedance The latching relays have two coils applying power to the RESET coil will de select the input and power applied to the SET coil will select the input All relays are reset individually as a part of the power on sequence The attenuator relay will be automatically reset by the power up down RESET signal This protects the input amplifier from SCR latch up when the power is fir
80. uple junction by measuring the voltage and computing the temperature from the known characteristics of B E J K R S or T type thermocouples Additional junctions are formed where the thermocouples connect to the back panel of the instrument but the SR630 compensates for these by measuring the temperature of the connector block and subtracting the expected voltages which depend on the thermocouple type and connector block temperature before computing the thermocouple temperature Four analog outputs on the rear panel of the instrument may be used to drive strip chart recorders or to adjust proportional temperature controllers Small offset voltages at the outputs may be nulled from the front panel or via the computer interfaces The SR630 has GPIB IEEE 488 RS232 and printer interfaces The GPIB and RS232 may be used to control all functions and to read data from the instrument The printer port may be used to log data from the 16 channels in either a numerical or graphic format An alarm may be set to signal when the measured temperature goes above Tmax or below Tmin or if the thermocouple becomes an open circuit A rear panel BNC provides a switch closure during an alarm condition or when the unit is turned off A battery backed up real time clock maintains the time and date when the unit is off An alarm may be set to signal when the meausred temperature goes above Tmax or below Tmin or if the thermocouple becomes an open

SR630 Manual - Stanford Research Systems

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