BEAMEX TC305 Service Manual
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BEAMEX TC305 Service Manual

Temperature calibrator
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Service manual for
TEMPERATURE CALIBRATOR
TC305/TC303
Dear user,
We have made every effort to ensure the accuracy of the
contents of this manual. Should any errors be detected, we
would greatly appreciate to receive suggestions to improve the
quality of the contents of this manual.
The above not withstanding, we can assume no responsibility
for any errors in this manual or their eventual consequences.
We reserve rights to make modifications to this manual without
any further notice.
For more detailed technical data about the Service manual for
TC305/TC303, please contact the manufacturer.
© Copyright 1997
OY BEAMEX AB
P.O. Box 5
68601 Pietarsaari
FINLAND
Tel
Fax
E-mail:
Internet: http://www.beamex.com
+358 - 6 - 7840111
+358 - 6 - 7840404
sales@beamex.com
8830100 / SETC305 / 912417

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  • Page 1 We reserve rights to make modifications to this manual without any further notice. For more detailed technical data about the Service manual for TC305/TC303, please contact the manufacturer. © Copyright 1997 OY BEAMEX AB P.O. Box 5...

  • Page 2: Table Of Contents

    CONTENTS PART A. FUNCTIONAL DESCRIPTION 1 GENERAL ..........................A - 1 2 SECTION A ..........................A - 2 3 SECTION B ..........................A - 3 PART B. SERVICE 1 WARNING DURING OPERATION ..................B - 1 2 HARDWARE ERROR MESSAGES ..................B - 2 3 SERVICE, TROUBLESHOOTING AND REPAIR ..............
  • Page 3 8 CALIBRATION DATE ......................C - 13 9 AUTO CALIBRATION OF GENERATION RANGES............C - 14 10 CALIBRATION PERIOD ..................... C - 15 PART D. SERIAL COMMUNICATION 1 GENERAL ..........................D - 1 2 TECHNICAL SPECIFICATIONS .................... D - 2 2.1 Flow control (XON/XOFF) ....................

  • Page 4: Part A. Functional Description

    FUNCTIONAL DESCRIPTION...

  • Page 6: General

    1 GENERAL The functions of TC305/TC303 temperature calibrator are divided in two sections. The left side of the connection panel and the upper display constitute the Measure/Generate section which is called the A-section. The right side of the connection panel and the lower display constitute the Measure section, called here the B-section.

  • Page 7: Section A

    It switches off the current for a part of the time. This enables compensation of the thermovoltages in the resistance measurement circuit. In voltage and current generation TC305/TC303 makes the output with the D/A- converter and assures the accuracy by continuously measuring the generated value.

  • Page 8: Section B

    This enables you to generate the input of an instrument and simultaneously measure the instrument output. The B-section microprocessor also carries out the communication with the user and with the computer via the serial computer interface. TC305/TC303 - Functional Description A - 3...

  • Page 9: Part B. Service

    SERVICE...

  • Page 10: Warning During Operation

    1 WARNING DURING OPERATION If you try to use TC305/TC303 in a strange way, it may warn you about it. The following list explains the used warning messages in detail. NO TCAL Attempt to start Quick Store or Quick Examine function when TCAL305 expansion software is not installed.
  • Page 11 It should not come in sold devices. However, if it comes, there is fault in the EEPROM memory. TC305/TC303 has lost all calibration data. Do not use it for calibration purposes. Send it to the manufacturer for repair.

  • Page 12: Hardware Error Messages

    2 HARDWARE ERROR MESSAGES If TC305/TC303 detects errors in its internal functions, it denies all operations and shows an error code: ERROR CODE n The error code helps to decide, how to correct the error. Error codes: The A-section microprocessor doesn't answer when called from the B-section.

  • Page 13: Service, Troubleshooting And Repair

    Reassembling requires opposite steps. If the front assembly has been removed, TC305/TC303 looses date, time and all data stored in the read/write memory. This includes Working Memory, Data Memory and all configuration settings. Calibration data as well as installation of software options do not change, because they are stored in the non-volatile EEPROM memory.

  • Page 14: Updating The Software Version

    3.2 Updating the software version TC305/TC303 software is stored in two EPROM memories, one on each processor board on the bottom of the calibrator. The left side (front view) processor board is named 'main processor board' and the right side processor board is 'temperature processor board'.

  • Page 15: Replacing The Battery Pack

    5 seconds and try to switch on again. 3.5 Hardware troubleshooting If TC305/TC303 doesn't function properly, we recommend that you send it to us for reparation. Board or module level trouble shooting can be done also by other qualified service personnel. However, reparations by others than Beamex during the warranty period invalidate the warranty.

  • Page 16: Front Assembly

    15 minutes and the calibrator is not switched on. Warning! Avoid short circuiting the battery terminals, the short circuit current may cause burns, battery damage or even fire. See also warning in the Instruction Manual Part A, Chapter 2.3. TC305/TC303 - Service B - 7...

  • Page 17: Power Supply Board

    Warning! Use an ordinary ohm meter, not a high voltage isolation meter. The galvanic isolation between the sections is for functional purposes only. B - 8 TC305/TC303 - Service...

  • Page 18: Analog I/O Assembly

    We will give you orders, how to change the serial number without losing the installed software options. If TC305/TC303 doesn't measure or generate/simulate properly, a fault in analog i/o assembly is most obvious. If the only problem is a too large calibration error, try to correct it by calibration (see part C of this manual).

  • Page 19: Processor Boards

    When you reconnect the battery wire, you should be able to switch the calibrator on again. When the batteries have been disconnected, TC305/TC303 loses the contents of the read/write memory as well as the real time clock time and date.

  • Page 20: Part C. Calibration

    CALIBRATION...

  • Page 21: General

    1 GENERAL The tolerances, unlinearities and temperature coefficients of the components related to the accuracy of TC305/TC303 are taken into account in the definition calibration at the factory. All the necessary parameters are in the nonvolatile EEPROM memory of each TC305/TC303 calibrator. This information is valid as long as you don't change certain components in the analog part.
  • Page 22 >10 GΩ, accuracy better than 0.001 % of reading The stated accuracies for the necessary equipment are about three times better than the accuracy specified for TC305/TC303. If the accuracies of the calibration equipment are worse, the calibration period should be shorter. If you, however, are not sure that the calibration equipment has better accuracy than the TC305/TC303 to be recalibrated, send it to Beamex for calibration.

  • Page 23: Preparations Before Calibration

    There should be at least 50 % of the battery capacity left in the TC305/TC303. Disconnect the charger at least one hour before the calibration. Switch the calibrator on about one hour before starting the calibration.

  • Page 24: Section B Measurements

    B-section measurements. In order to prevent accidental calibration, TC305/TC303 requests for a security code S.CODE Start with TC305/TC303 serial number, key in an extra '1' and finally press qENT. For instance to the device with s/n 780, key 7801 ENT The lower display shows now the measured electrical signal.
  • Page 25 VALUE Enter a new value so, that it fits within the limits of one of the points in the table above. If the measured value differs too much from the entered value, TC305/TC303 only flashes the error message: ERROR without altering the calibration. Check that the connected signal is correct and try again.

  • Page 26: Section A Measurements

    A-section measurements. In order to prevent accidental calibration, TC305/TC303 requests for a security code S.CODE Start with TC305/TC303 serial number, key in an extra '2' and finally press qENT. For instance to the device with s/n 780, key 7802 ENT The upper display shows now the measured electrical signal.
  • Page 27 VALUE Enter a new value so, that it fits within the limits of one of the points in the table above. If the measured value differs too much from the entered value, TC305/TC303 only flashes the error message ERROR without altering the calibration. Check that the connected signal is correct and try again.

  • Page 28: Resistance Simulation

    In order to prevent accidental calibration, TC305/TC303 requests for a security code S.CODE Start with TC305/TC303 serial number, key in an extra '3' and finally press qENT. For instance to the device with s/n 780, key 7803 ENT For measurement of the simulated resistance, use a resistance measurement equipment with measurement current 1 mA ±10 %.
  • Page 29 ENT= SAVE press the key qENT. Now TC305/TC303 saves the new calibration factors to the EEPROM memory and returns to the basic measure/generate operation. Pressing any other key than qENT causes return to the calibration mode.

  • Page 30: Internal Reference Junction Compensation

    In order to prevent accidental calibration, TC305/TC303 requests for a security code S.CODE Start with TC305/TC303 serial number, key in an extra '4' and finally press qENT. For instance to the device with s/n 780, key 7804 ENT Carry out the calibration as explained either in Chapter 7.1 or in Chapter 7.2.

  • Page 31: Calibration With Thermocouple

    Use a good quality thermocouple of type E, J, K or T. We recommend the type E because of its high output voltage. Do not use extension wires or plug. Connect the thermocouple to the TC305/TC303 thermocouple connector block. Place the other end of the sensor into the calibration bath (usually an icebath) at least one hour earlier to assure good temperature stabilization.

  • Page 32: Calibration With A Thermometer

    Select the thermocouple type B with the up arrow key (key SENSOR[7] is numeric in this mode). Selecting type B is used as a flag telling to TC305/TC303 that you want to calibrate with a thermometer instead of a thermocouple. The upper display shows now the internal temperature of the TC305/TC303 thermocouple connector block in default temperature units.

  • Page 33: Calibration Date

    8 CALIBRATION DATE TC305/TC303 saves the latest calibration date. There is a separate date for both A- and B-section calibration. If there is no need to change the calibration of a section, you may anyhow want to save the calibration date.

  • Page 34: Auto Calibration Of Generation Ranges

    Check the connections and press qENT to the prompt mA.LOOP ENT=GO TC305/TC303 checks the mA loop. In case of fault it exits flashing the message CAL ERROR. During the auto calibration TC305/TC303 blinks the message ACAL The mV, V and mA arrows show the phase of the process.

  • Page 35: Calibration Period

    CALIBR SOON every time you switch it on. You can use TC305/TC303 normally in spite of the message, if you press qESC. To assure the accuracy, however, you should recalibrate the calibrator soon.

  • Page 36: Part D. Serial Communication

    SERIAL COMMUNICATION...

  • Page 37: General

    1 GENERAL The TC305/TC303 computer interface connector uses CMOS/TTL level signals. No handshaking lines are used. Use Beamex RS1 or RS2 interface device to connect TC305/TC303 to the computer serial port. These interface devices convert the signals to the standard RS-232 level. RS1 computer interface makes galvanic connection between TC305/TC303 and the computer.

  • Page 38: Technical Specifications

    NUL (ASCII code 0) characters are omitted by TC305/TC303. 2.1 Flow control (XON/XOFF) TC305/TC303 uses XON (ASCII code 17) and XOFF (ASCII code 19) for flow control. When the receive buffer (256 bytes) fills up to 70% (180 bytes) TC305/TC303 sends an XOFF to the host. When the receive buffer empties to 10% (25 bytes) TC305/TC303 sends an XON to the host.

  • Page 39: Acknowledgment (Ack/Nak)

    ACK (acknowledgement) or NAK (negative acknowledgement). On reception of NAK TC305/TC303 will resend the last message, whereas ACK allows TC305/TC303 to send next message. That is: if checksum is invalid send NAK, if checksum is correct send ACK.

  • Page 40: Commands

    'x0' is performed successfully but then TC305/TC303 does not recognize 'RESET305' as a special command while the special commands need to be alone on the command line. I.e. TC305/TC303 would process the commands x0, R, E, S, E and T305.

  • Page 41: Interface Configuration And Control

    Send checksum, receive acknowledgement Receive checksum, send acknowledgement Send and receive checksum and acknowledgement 3.1.2 Line termination These commands set the line termination codes used by TC305/TC303. Y0 *) line termination = CR+LF line termination = LF+CR line termination = CR only...

  • Page 42: Control Of Sent Measurement/Generation Readings

    See Appendix B for more information about the printout format. 3.1.4 Use of status codes Status request. After sending the present status TC305/TC303 clears the status. S0 *) Never automatically send status...

  • Page 43: Formatting Of Readings

    No space on sign place nor plus if positive |12.34 No plus if positive | 12.34 Always use sign |+12.34 (Options apply to positive numbers, option 20 applies only if option 11 (left justify) is in use) TC305/TC303 - Serial Communication D - 7...

  • Page 44: Device Configuration

    3.2 Device configuration 3.2.1 A-section (upper display) electrical unit selection 3.2.2 A-section temperature / electrical mode selection Electrical mode Temperature mode; Celsius Temperature mode; Fahrenheit Temperature mode; Kelvin D - 8 TC305/TC303 - Serial Communication...

  • Page 45: Temperature Sensor Selection

    T09 Special sensor S1 T10 Special sensor S2 T11 Special sensor S3 The required electrical unit (mA, mV, V or ohm) must be set before setting the sensor type. 3.2.4 Temperature scale IPTS-68 ITS90 TC305/TC303 - Serial Communication D - 9...

  • Page 46: Cj-Selection

    NOTE! The 'W' commands require Local OFF status ('Z1' command). When the calibrator is put back to Local ON state, the switch modes will change back to the physical switch settings on the calibrator. D - 10 TC305/TC303 - Serial Communication...

  • Page 47: B-Section (Lower Display) Electrical Unit Selection

    3.2.8 B-section (lower display) electrical unit selection Switch 3.2.9 Local on/off Enable keypad and switches (local on). Keypad and switches are automatically enabled, when TC305/TC303 is switched on. Disable keyboard (local off). All keys except LIGHT and OFF are disabled. TC305/TC303 - Serial Communication...

  • Page 48: Calibration And Service

    Select 10 ohm calibration point using higher gain in the amplifier Select 4000 ohm calibration point Calibration of internal reference junction compensation Auto calibration of generation ranges Pxxx.xxxx Set calibration point Bxxxxx Set calibrator serial number D - 12 TC305/TC303 - Serial Communication...

  • Page 49: Commands For Key Emulation / Inquiry

    These commands get or emulate a key press on the calibrator keypad. Get key press (requires 'Z1' command (local OFF)). TC305/TC303 answers with the key code (same as in the following commands). If the key is for instance SENSOR[7], the answer is 'Key: 00'. If no key was pressed, the answer is 'No key'.

  • Page 50: Other Standard Commands

    Send model and calibrator/analog board serial numbers Send B-section CPU software version number Send A-section CPU software version number Send communications interface software version number Send version comment 3.5.2 Set/get date Send date Dddmmyyyyhhmmss Set date day,month,year,hour,minute,second D - 14 TC305/TC303 - Serial Communication...

  • Page 51: Display Message

    If displays are reserved for some important purpose, for example numeric input, TC305/TC303 reports Busy error. In this case, send first ESC-key code ('K03' command) to release the display and then try the 'E' command again.

  • Page 52: Special Commands

    'CAL305[cr]Yes[cr]' to the calibrator. Warning! Improper use of calibration commands may affect the precision of TC305/TC303. Do not recalibrate unless you have the necessary equipment available. Refer to the calibration instructions. D - 16 TC305/TC303 - Serial Communication...

  • Page 53: Appendixes

    APPENDIXES...

  • Page 54: Appendix A: Status Code / Error Messages In Serial Communication

    The shown status codes are used, if only one error has occurred. If several errors occur, the status codes of the errors are ORed. For instance after invalid command (0001h) and checksum error (2000h) the status is 2001h. Requesting the status clears the status code (after sending it). TC305/TC303 - Appendixes X - 1...

  • Page 55: Appendix B: Measurement Printout Format

    Note that the %-mode settings do not affect the upper nor the lower display readings, their representation remains in engineering units. Some positions are not currently used, they are reserved for future expansion, and they currently contain spaces. Examples of printout: M_____-4.478mV____-4.605mV______________N__ M_____-0.001mA____-4.385mV_________________ M____Hi_Ofl_C_____-0.019mA_____B___25.86I68 G___________mV____-0.020mA______________N__ G___c__1.002mA_o___0.668SWI________________ 1234567890123456789012345678901234567890123456 X - 2 TC305/TC303 - Appendixes...
  • Page 56 M = Manual N = None _ = n/a 43-44 Temperature scale 68 = IPTS-68 90 = ITS90 First line terminator character (CR or LF) Second line terminator character (LF or CR or none) TC305/TC303 - Appendixes X - 3...

  • Page 57: Appendix C: Algorithms

    80 S$=S$+HEX$(INT(A%/16)) :REM Add checksum (first character) 90 S$=S$+HEX$(A% MOD 16) :REM Add checksum (second character) APPENDIX D: TC305/TC303 RS-232 SAVEABLE OPTIONS The following options may be saved/restored along with the other options: Acknowledgment w checksum, Output formatting, Automatic send interval, Status message send and Line terminator options.

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