BEAMEX TC305 Manuale utente
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 +358 - 6 - 7840111
Fax +358 - 6 - 7840404
E-mail: [email protected]
Internet: http://www.beamex.com
8830100 / SETC305 / 912417
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.................................................................. B - 4
3.1 Disassembling and reassembling the calibrator......................................................... B - 4
3.2 Updating the software version....................................................................................... B - 5
3.3 Installing software options............................................................................................. B - 5
3.4 Replacing the battery pack............................................................................................. B - 6
3.5 Hardware troubleshooting.............................................................................................. B - 6
3.5.1 Front assembly.............................................................................................................B - 7
3.5.1.1 Display and keypad board......................................................................................B - 7
3.5.1.2 Battery pack............................................................................................................B - 7
3.5.1.3 Power supply board................................................................................................B - 8
3.5.2 Analog i/o assembly .....................................................................................................B - 9
3.5.3 Processor boards .......................................................................................................B - 10
3.5.4 Optional 24V supply board.........................................................................................B - 10
PART C. CALIBRATION
1 GENERAL ............................................................................................................................... C - 1
2 EQUIPMENT REQUIRED FOR CALIBRATION.................................................................... C - 1
3 PREPARATIONS BEFORE CALIBRATION.......................................................................... C - 3
4 SECTION B MEASUREMENTS............................................................................................. C - 4
5 SECTION A MEASUREMENTS............................................................................................. C - 6
6 RESISTANCE SIMULATION.................................................................................................. C - 8
7 INTERNAL REFERENCE JUNCTION COMPENSATION.................................................. C - 10
7.1 Calibration with thermocouple..................................................................................... C - 11
7.2 Calibration with a thermometer ................................................................................... C - 12
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)............................................................................................... D - 2
2.2 Checksum......................................................................................................................... D - 2
2.3 Acknowledgment (ACK/NAK) ........................................................................................ D - 3
2.4 Line terminators (CR/LF)................................................................................................ D - 3
3 COMMANDS........................................................................................................................... D - 4
3.1 Interface configuration and control............................................................................... D - 5
3.1.1 Communication control................................................................................................ D - 5
3.1.2 Line termination........................................................................................................... D - 5
3.1.3 Control of sent measurement/generation readings..................................................... D - 6
3.1.4 Use of status codes..................................................................................................... D - 6
3.1.5 Formatting of readings................................................................................................. D - 7
3.2 Device configuration....................................................................................................... D - 8
3.2.1 A-section (upper display) electrical unit selection....................................................... D - 8
3.2.2 A-section temperature / electrical mode selection...................................................... D - 8
3.2.3 Temperature sensor selection..................................................................................... D - 9
3.2.4 Temperature scale....................................................................................................... D - 9
3.2.5 CJ-selection............................................................................................................... D - 10
3.2.6 Generation value setting ........................................................................................... D - 10
3.2.7 Emulation of mechanical switch settings .................................................................. D - 10
3.2.8 B-section (lower display) electrical unit selection ..................................................... D - 11
3.2.9 Local on/off................................................................................................................ D - 11
3.3 Calibration and service................................................................................................. D - 12
3.4 Commands for key emulation / inquiry....................................................................... D - 13
3.5 Other standard commands........................................................................................... D - 14
3.5.1 System details ........................................................................................................... D - 14
3.5.2 Set/get date ............................................................................................................... D - 14
3.5.3 Display message....................................................................................................... D - 15
3.6 Special commands........................................................................................................ D - 16
APPENDIXES
APPENDIX A: STATUS CODE / ERROR MESSAGES IN SERIAL COMMUNICATION .......X - 1
APPENDIX B: MEASUREMENT PRINTOUT FORMAT ...........................................................X - 2
APPENDIX C: ALGORITHMS....................................................................................................X - 4
APPENDIX D: PC106P RS-232 SAVEABLE OPTIONS..........................................................X - 4
FUNCTIONAL
DESCRIPTION
TC305/TC303 - Functional Description A- 1
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.
A- 2TC305/TC303 - Functional Description
2 SECTION A
The A-section microprocessor takes care of electrical measurements and
generations/simulations. It also makes all calculations required for temperature
sensor simulations and measurements. It uses one A/D-converter for all these
measurements and one D/A-converter for generations/simulations.
In resistance measurement TC305/TC303 generates the measurement current
and measures the voltage across the resistance. 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.
In resistance simulation there should be an external resistance measurement
device measuring the resistance between the TC305/TC303 output terminals.
The D/A-converter detects the measurement current coming from the external
measurement device. It controls the voltage across the resistance output
terminals so that it is in the correct ratio to the detected current. The
microprocessor defines this ratio according to the Ohm's law and the simulated
resistance value.
Theoretically the resistance simulation could be able to simulate the given
resistance also to an AC circuit. In practice, anyhow, it is always too slow to
achieve reasonable accuracy, if the measurement device uses AC supply for
resistance measurement. Fortunately AC measurement of resistance is very
seldom used nowadays.
Some resistance measurement devices - like TC305/TC303 itself - use pulsed
current for resistance measurement. Simulation to these devices is possible with
TC305/TC303. The measurement device should, however, give enough time for
the circuits to settle after switching the current on. This is normally necessary also
because of the inductance and capacitance of the industrial resistance
measurement circuits.
TC305/TC303 - Functional Description A- 3
3 SECTION B
The B-section microprocessor uses another A/D-converter to measure current or
voltage. There are also circuits for switch state detection. There is a galvanic
isolation between the two sections. 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.
SERVICE
TC305/TC303 - Service B- 1
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.
NO ID No instrument identifier defined.
CLEAR AREA No instrument data in the loaded memory area.
UNDEFD SENSOR Attempt to load instrument data from Data Memory. The
defined sensor type was not known and loading was denied.
If a special sensor is included in the instrument data and the
special sensor is no longer fixed to the defined special
sensor place, the required special sensor arrow is lit.
CONFIG ERROR Attempt to start the Quick Store function with faulty
configuration, e.g. the instrument type is FREE.
SCAN ERROR The actuation or deactuation point of a limit switch out of the
scan limits or scan limits out of the generation/simulation
range of the calibrator.
NOT SAVED Attempt to change the contents of the Working Memory
without saving the results of the latest Quick Store to the
Data Memory.
CANCEL STORE Escaping from Quick Store before altering the contents of
the Working Memory.
DATA LOST TC305/TC303 has lost its configuration data, instrument
data and calibration results due to the missing RAM backup
voltage. The obvious reason is, that the battery has been
disconnected for a while or empty battery has not been
recharged in time. Switch the calibrator off and check the
battery wiring, recharge the battery or replace it if necessary.
If the error remains, send TC305/TC303 to Beamex or
representative for repair.
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