EZECAL 5 - FGH Controls Limited Homepage
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1. Changing range Fig 19 Fig 20 Fig 21 Fig 22 The EZECAL 5 is equipped with 20 standard ranges plus four user defined ranges The range must be selected for both the simulation output and the measurement input and hence there is a range select screen for each M35 Issue 1 12 EZECAL 5 USER MANUAL 3 2 3 3 To change range from the primary screen press the F1 RANGE key The current range name selected is shown on the top line of the display along with the associated range units resolution and reference type The parameter to be modified is indicated by means of the triangular pointer cursor This can be positioned by pressing the F1 DOWN ARROW key To change the range press the F2 NEXT key and the next range will be shown Alternatively rotate the pot until the required range is shown See appendix A for a list of available ranges To toggle between the simulation and measurement range screens press the F3 key Fig 24 Finally to return to the primary screen press F4 QUIT Changing temperature units On temperature ranges the user can select the display units and resolution Temperatures may be displayed in degrees Celsius or Fahrenheit and in 1 or 0 1 resolution On non temperature ranges the UNITS line indicates units and resolution for information only From the range select screen index down to the UNITS line using F1 Select the required units and resolution using F22. Install Equa tion Editor and double click here to view equation 1 click here to view equation 2 LINEARISER INPUT LINEARISER OUTPUT ACTUAL INPUT INPUT ACTUAL OUTPUT OUTPUT A M35 Issue 1 6 APPENDIX 53 B 2 Custom range programming sheet EZECAL 5 CUSTOM RANGE PROGRAMMING SHEET PURPOSE RANGE NUMBER NAME Fram o GE omy ama woo LAW UNITS eorn A AC Tom oom Tore DISPLAY HIGH LIMIT IO HIGH LIMIT DISPLAY LOW LIMIT 1 0 LOW LIMIT TEMPERATURE COMPENSATION mV C PURPOSE RANGE NUMBER NAME Fam vorance I mv ama wm LAW UNITS or AI AC Te oom Tore E DISPLAY HIGH LIMIT IO HIGH LIMIT DISPLAY LOW LIMIT 1 0 LOW LIMIT TEMPERATURE COMPENSATION mV C PURPOSE RANGE NUMBER NAME Fam vorance I mv EI LAW UNITS CEUTA A AC Te oom Tore E DISPLAY HIGH LIMIT IO HIGH LIMIT DISPLAY LOW LIMIT I O LOW LIMIT TEMPERATURE COMPENSATION mV C M35 Issue 1
3. Thermocouples to Engelhard published data TC W Thermocouple type W W W26 Re TC W3 Thermocouple type W3 W3 Re W25 Re TC W5 Thermocouple type W5 W5 Re W26 Re Thermocouples to DIN 43710 TC L Thermocouple type L Fe CuNi TC NiMo Thermocouple type NM Ni Ni18 Mo Resistance thermometers to BS1904 Pt100 Platinum resistance thermometer 1000 0 C Resistance thermometer to DIN 43760 Ni100 Nickel resistance thermometer 1000 0 C 100mV DC Voltage 1V DC Voltage 10V DC Voltage 20mA DC Current 4000 Resistance 50 to 1768 C 50 to 1768 C 210 to 1200 C 270 to 1372 C 270 to 400 C 270 to 1000 C 0 to 1820 C 270 to 1300 C 0 to 2320 C 0 to 2320 C 0 to 2320 C 200 to 900 C 0 to 1310 C 200 to 850 C 60 to 180 C 10mV to 100mV 0 1V to 1V 1V to 10V OmA to 20mA 00 to 4000 M35 Issue 1 50 EZECAL 5 USER MANUAL A4 Conformity The following graphs show the maximum linearisation errors in C ERROR ERROR Cc c 10 10 Type S Thermocouple Type R Thermocouple 405 05 0 0 1 1 1 1 0 5 0 5 10 10 410 10 05 05 j 20 40 gt 60 eb tomo 1abo tado 1000 18 j a o a n Oe OS ATTO 05 10 10 M35 Issue 1 6 APPENDIX 51 ERROR c M35 Issue 1 52 EZECAL 5 USER MANUAL B 1 Custom law programming sheet EZECAL 5 CUSTOM LAW PROGRAMMING SHEET PURPOSE WRITTEN BY Install Equa tion Editor and double
4. A i at 35 6 2 2 Gommand tr ez ntr erred a A A ARA 36 6 2 3 7 Variable ty POS vss aeon perses nil AI ian ici 37 6 2 4 MERC paint clio cea ance Sea li cile do Zones ile oa i oli li pilo loi lodi rado 40 6 2 5 Stats Col iii ROERO ian 41 6 3 Notes Al SECTION 7 CALIBRATION 42 7 0 Gerierala t anta AN RaSh NE ATA BEANE Na RS IRS NIM onu Lene ii TN 42 7A Galibrationimode inti ssaa balia alan aa aria ea a eli La io 42 7 2 Input calibration ridare lla iatale 42 7 3 Quiputcalibrationi i Neasexncenechcernasectecsachsseissactsnxentosnsssotrnateinnad bies Set uienect vepwossstaceastentiatentevsnetneassdeist EARN 44 7 4 Reference junction temperature calibration u iii 45 7 5 Galibrationidate i cm cer diri ii aa li nali 46 APPENDIX A SPECIFICATIONS oso isione eneore tepee akenei sanina aenea meekonna aia aaeeea eana akan aiara iaeiae aanak a Saanane raira ipdan aeie 48 A 1 ESTs ARE E etal E T E ae S E E E T A 2 M asurement INpuls inaina a ea A 2 Simulation outputs A 3 Ranges and standards A 4 CAM MY ato B 1 Custom law programming sheet B 2 Custom range programming sheet M35 Issue 1 1 INTRODUCTION 1 SECTION 1 INTRODUCTION 1 0 General The EZECAL 5 is a general purpose tool intended for the calibration of control equipment instrumentation and transducers It can both simulate and measure simultaneously and is also equipped with a power supply output t
5. NEXT or the control wheel Fig 25 Changing cold junction mode For accurate measurement or simulation of thermocouples the EZECAL 5 must compensate for the temperature of the reference junction If the thermocouple is wired to the EZECAL 5 in compensating cable then this reference junction exists at the terminals of the calibrator and the cold junction mode should be set to INTERNAL Fig 26 M35 Issue 1 3 3 4 OPERATION 13 Alternatively if an external reference junction is used then the reference type should be set to MANUAL and the reference temperature entered under VALUE Fig 27 Saving frequently used values The EZECAL 5 has ten memories in which simulate values can be stored These may be used to store frequently used output values such as O and 1000 or be used together to form an output profile which may be replayed in sequence automatically To store a value in memory first of all enter a valid simulate value for example 100 0 Then press the STORE button The display will indicate on the top line that a store cycle is in progress Now press the numeric key appropriate to the memory in which ou wish to store the value or rotate the control wheel The top line of the display will show the current contents of the memory Press ENT to store the value in the selected memory or press STORE to abort without saving To recover a value from memory press the RECALL key The top line of the d
6. Platinum 100R RTD NI100 Nickel 100R RTD 100MV Linear voltage 100mV 1V Linear voltage 1V 10V Linear voltage 10V 20MA Linear current 20mA 4000HM Linear resistance 400R CUSTOM Custom range 1 CUSTOM2 Custom range 2 CUSTOM3 Custom range 3 CUSTOM4 Custom range 4 Example MEAS RNGE TC K lt CR gt Would set the current measure range to thermocouple type K MEAS RNGE TC K lt CR gt Would be returned from the EZECAL 5 RES TYPE This type of parameter is used to set the measurement or simulation resolution and must be one of the following 1 0 1 0 01 0 001 0 0001 Example If the current simulation range is one of the thermocouple ranges SIMU RESN 0 1 lt CR gt Would set the simulate resolution to 0 1 degrees SIMU RESN 0 1 lt CR gt Would be returned from the EZECAL 5 REF MODE TYPE This parameter type is used to set the reference junction cold junction operating mode MANUAL Manual mode junction temperature must be manually entered INTERNAL Internal mode reference junction temperature in internally measured Example MEAS REFR MODE INTERNAL lt CR gt Would cause the measurement to use the internally measured reference jt MODE TYPE This parameter type is used to select the basic operating mode SIM The EZECAL 5 displays only the simulation value MEAS The EZECAL 5 displays only the measured value BOTH The EZECAL 5 displays both simulate and measured values Example MODE MEAS lt CR gt Would cause the instrument to di
7. cable should be used if possible Point to the required range using F1 and press F2 SELect Fig 102 Set the reference source to the ZERO value in table 7 2 and allow at least 30 seconds for the measurement to settle before making any adjustments The input value is displayed to its maximum resolution during input calibration and because of this the least significant digit shown may change by more than one digit at a time Point to the ZERO parameter using F1 and rotate the control wheel until the measured input is as close as possible to the correct value Fig 103 Set the reference source to the SPAN value in table 7 2 again allowing time for the measurement to settle Point to the SPAN parameter using F1 and rotate the control wheel until the measured input is as close as possible to the correct value Fig 104 M35 Issue 1 44 EZECAL 5 USER MANUAL Repeat the ZERO and SPAN adjustments until no further adjustment is necessary Check linearity by setting the reference source to the CHECK values given in table 7 2 and checking that the displayed measurement is within the stated tolerance Repeat the above procedure for each input range 7 3 Outputcalibration There are individual calibration adjustments for each of the five basic output ranges and an additional adjustment for the output cold junction temperature sensor The calibration of the output ranges may be performed in any order Select O P CALIBRATI
8. chini 14 4 1 Measurement versus time logging sn a liane A danello isa iaia 14 4 2 ROOTS AOS ii 15 421 Display ea APN ua a A ac ld o ina 15 4 22 Replaylogged data cid NA A A deb si ici NLR SAR osi s ace ty 16 4 2 3 Replay stored data a a a ada tad 17 4 2 4 sIDUMP IOG VAISS cdi a AO i ia aLe ea ea det 17 4 2 Storing Calibration records RR A Ae aay 18 4 2 1 Opening a calibration record ile ssiri tii dt ia 19 4 2 2 Saving a pre calibration Point ARI 19 4 2 3 Closing the pre calibration recordfile ui iii 20 4 2 4 Recording post calibrationidata t iii acacia 20 4 3 Retrieving Calibration recordset aie a a di aaa 21 4 3517 Show Calibration file seal la Aa 22 4 3 2 Printicalibrationi Cai pal 22 43 37 Dump Galibrationidata gt ccr A ata E E A aiii 23 4 4 Deleting arcalibrationilS a TA AE AA A A AS ad 24 4 5 Custom ranges 4 6 Programming custom laws settare dazi alati ie teak ee Alcea E ev ete i a 28 SECTION 5 CONFIGURATION lt lt ute ceugtescuuuctucedaeduenaedar iia 32 5 1 O i 5 2 Backlight eontrol t iaia aula ie RA iosa lillo 5 3 Control wheel sensitivity 5 4 Communications tr fa ARNO ISIS ee Na NA ANO o IA ey te SECTION 6 SERIAL COMMUNICATIONS 1 xsvserenernienecz esa zioni aa aaa eea A a eee iii nine 34 6 0 Generali OA 34 6 1 Connections Aaa RO I NE i 34 6 2 Protocol aaa ua talia aa rea 34 6 2 1 Gommand syntax ia
9. functions changing the function will result in any stored data being lost So make sure that any logged data is no longer required before selecting the alternate function Select LOGGER FUNCTION from the configuration menu The cursor will indicate the current logger mode Press F2 LOG to use the log memory for time v input logging Press F3 CALibration record to use the logger memory to store calibration files Press F4 QUIT to abort without changing function Fig 92 5 2 Backlight control The EZECAL 5 is equipped with a backlight to illuminate the display under bad lighting conditions Unfortunately the backlight can require a lot of power from the batteries To help increase battery life the backlight can operate in one of three modes ALWAYS OFF The backlight is always off recommended for portable use in good light conditions TIMED The backlight comes on whenever a key is pressed or the control wheel is used and remains on for 15 seconds recommended for portable use in bad light conditions ALWAYS ON The backlight is permanently on recommended for bench top use with the supply adaptor fitted To select the mode of operation select BACKLIGHT CONTROL from the configuration menu Use F3 NEXT to select the backlight mode required Fig 93 M35 Issue 1 5 5 3 5 4 CONFIGURATION 33 Control wheel sensitivity The sensitivity speed of response of the control wheel can be set to one of five le
10. law advance to breakpoint 1 input using F1 and enter the required value on the numeric key pad or control wheel Fig 85 Then press F1 again and enter the output value for breakpoint 1 Fig 86 Continue in the same way and enter the values for all the breakpoints When the pointer reaches the last parameter on the display the display will automatically advance to the next page Alternatively the display may be manually paged by pressing F2 PAGE Fig 87 M35 Issue 1 4 ADVANCED FEATURES 31 Continue to enter the values until all four pages have been completed Fig 88 If a value is entered in error and this error breaks the custom law rules as described earlier then an asterisk is shown next to the value The asterisk will disappear when the error is corrected Fig 89 Now that the new law has been entered it may be called up a from the custom range set up screen The following two screens show how the custom range would be set up to measure or simulate the special thermocouple in the example Fig 90 Fig 91 M35 Issue 1 32 EZECAL 5 USER MANUAL SECTION 5 CONFIGURATION 5 1 Logger function As described in earlier sections the logger memory may be used for one of two purposes To store a log record of measured input versus time or to hold calibration record files The selection of this function is made from the configuration menu Because the same internal memory area is used for both
11. next page of files Fig 63 Ensure that the computer is connected and ready to receive data Finally press F3 YES if everything is ready and the calibration point data will be transmitted to the computer or press F4 QUIT to abort Fig 64 M35 Issue 1 24 EZECAL 5 USER MANUAL 4 4 4 5 This display will remain until the file has been transmitted At which point the screen will return to the file selector menu in order that another file may be down loaded if required Deleting a calibration file Fig 65 After the calibration file has been printed or down loaded as necessary the calibration file may be deleted from memory From the cal record replay menu select the delete file option using F1 to move the cursor and F2 SELect to select Select the file name to be deleted from the file selector menu and press F2 SELect to select the chosen file If the file required is not shown on the display then press F3 MORE to show the next page of files On the confirmation screen press F3 YES if you are certain that you want to delete the chosen file Remember calibration files cannot be recovered once they have been deleted Custom ranges Fig 66 Fig 67 Fig 68 The EZECAL 5 is capable of storing up to four user defined ranges known as custom ranges These are used when a standard EZECAL range is not appropriate for the specific non standard simulation or measurement required Once a c
12. of a two wire transmitter for this couple the input and output values must be converted to percentages From the table above we take four parameters A B C D Where A is the minimum input value 270 B is the maximum input value 200 C is the minimum output value 4 714 D is the maximum output value 3 709 We then calculate for each input value ui 100 And for each output value O Dei 100 After calculating each value we get the table below Output 4 714 4 29 4 666 4 634 14 29 4 555 21 42 4 478 28 58 4 402 35 71 4 327 42 86 4 254 50 00 4 181 57 14 4 111 64 29 4 041 71 42 3 973 78 58 3 906 85 71 3 839 92 86 3 774 15 100 00 3 709 The custom law is now ready to load into the EZECAL 5 l x Eh pp 000 M35 Issue 1 30 EZECAL 5 USER MANUAL From the primary display press F3 CONFigure to access the configuration menu Then select CUSTOM LAW Fig 83 Select the law number required by pressing F3 LAW The law editing screen shows four breakpoints at a time and displays the input and output values as percentages The triangular pointer shows the currently selected parameter Use F1 to move the pointer to the next value as required The default law table shown contains evenly spaced breakpoints and describes a perfectly linear relationship between input and output Breakpoints 0 and 15 are fixed and cannot be modified Fig 84 To enter the calculated values for the new
13. user to create a test profile Unlike the REPLAY LOGGED option the test profile will be repeated over and over until the replay is manually stopped This test profile can be useful for example when checking the calibration of an instrument mounted in a control panel In this case the calibrator would be connected inside the panel to the instrument and the test profile entered as described in 3 4 The EZECAL 5 would then be set to replay the stored profile at say 1 minute per step The operator need now only to observe the instrument readings from the front of the panel and record them if necessary 4 2 4 Dump log values Data collected by the logger may be down loaded to a computer for analysis or printing This is only available if the serial communications option is fitted The data is transmitted using standard ASCII characters in a format suitable for most popular spreadsheet programmes From the replay options screen move the cursor to DUMP LOG VALUES using F1 and select using F2 SELect M35 Issue 1 18 4 2 EZECAL 5 USER MANUAL The log dump confirmation screen will now appear Ensure that the computer to be used is both connected and ready to receive data then press F3 to transmit the data Fig 46 While the data is being transmitted the display will show the word DUMPING This may take some time for slow baud rates and large amounts of logged data When complete the replay options menu will re app
14. 1 INTRODUCTION EZECAL 5 PRECISION PORTABLE PROCESS CALIBRATOR FGH Controls Ltd 1993 Every effort has been made to ensure the accuracy of the information contained in this manual Our policy of continuous product improvement could result in amendments to and omissions from this manual without notice FGH Controls Ltd do not accept responsibility for any damage loss or injury so caused M35 Issue 1 Il EZECAL 5 USER MANUAL CONTENTS SECTION 1 INTRODUCTION iii iii 1 1 0 General 1 1 Display nd Keyb ard ainra i A A A A A dd 1 1 2 O OO 3 SECTION 2 CONNECTIONS iii ie lean 2 0 A E E A lalui lata liano en eil dela Manda 2 1 Voltage Measurement 2 2 C frent Mes EER Ii 2 3 Resistance RTD Measurementi hi iaia AA ee see 5 2 4 Thermocouple Measurement 2 5 Voltage SIMIO a haga AS anit aE ee enna i Aen de I ee Medea O a 2 6 Gufrent Simulationi aaa dita 2 7 Resistance RTD Simulation 2 8 Thermocouple A A NEO 2 9 Transmitter power SUP aia 2 10 Hints for accurate low level voltage measurement and simulation i 10 SECTION 3 OPERATION dau a dia 11 3 0 Operating mode we 3 1 Changing range 11 3 2 ChangingtemperatureS nitS seen Aae ees rA E EESE iia 12 3 3 Changing cold junction mode 12 3 4 Saving frequently USCC VAlUES rrriiii iaia 13 SECTION 4 ADVANCED FEATURES 1 irrerie iii 14 4 0 Logging si anita A LO Bs die nei A fi
15. CUSR NUMB or CUSL NUMB commands respectively New custom range values will not take effect until the modified range is next selected as the current measure or simulate range e When setting the logger function using the LOGF command any existing logged data will be lost e The logger control commands LOGR will return an illegal command error code if they are used while the logger is configured to store calibration data M35 Issue 1 42 EZECAL 5 USER MANUAL SECTION 7 CALIBRATION 7 0 7 1 7 2 General The EZECAL 5 is a high precision instrument and as such should be calibrated at least once per year to maintain optimum performance Calibration should only be performed by trained and competent personnel and under standardised conditions using suitable equipment with calibration traceable to national standards To prevent unauthorised tampering with the calibration the calibration parameters are protected by a two level security system The CAL MODE switch and one case screw are fitted with a tamper evident label If either of these labels are missing or damaged then the instrument should not be used until the calibration has been verified by a reputable source and the labels have been replaced The calibration parameters are also protected by a PIN number which must be correctly entered by the operator before any adjustments can be made Calibration mode IMPORTANT The instrument and calibration equipment shou
16. Command syntax The charts below show the syntax paths for both commands sent to the EZECAL 5 and responses All commands and type data should be sent in uppercase characters and the user may insert spaces anywhere in the message if required These will be ignored by the EZECAL 5 ES STRING COMMAND SYNTAX lt SUFFIX gt RESPONSE SYNTAX The response message from the EZECAL 5 will be exactly of the form shown Numeric values will be returned in the same format as they are shown on the calibrator display Some subcommands require a suffix number to be sent after the subcommand string This is used to uniquely identify one of many similar parameters For example the command MEMY7 500 lt CR gt Uses a suffix value to store the value 500 in memory 7 Giving the response MEMY 7 500 lt CR gt M35 Issue 1 36 EZECAL 5 USER MANUAL 6 2 2 Command tree The following diagram shows the complete command tree for the EZECAL 5 along with the meanings and associated data types for each command Commands shown in square boxes have no data associated with them Values shown in angle brackets lt gt indicate the maximum value of the associated suffix number required NUMERIC SIMULATE VALUE RANGE TYPE SIMULATE RANGE UNIT TYPE SIMULATE UNITS RES TYPE SIMULATE RESOLUTION NUMERIC REFERENCE VALUE REF MODE TYPE REFERENCE MODE NUMERIC MEASURED VALUE RANGE TYPE MEASURE RANGE UNI
17. ON from the calibration mode menu Fig 105 Each range has a ZERO and SPAN parameter which should be adjusted individually via the control wheel Calibration should be performed at the points given in table 7 3 Table 7 3 Output calibration points Connect the precision measuring equipment to the appropriate terminals see section 2 Low thermal emf cable should be used if possible Point to the required range using F1 and press F2 SELect Fig 106 Set the precision measuring equipment to the appropriate range and resolution M35 Issue 1 T CALIBRATION 45 7 4 The current desired output value is displayed as OUTPUT on the display Press F2 MINimum to force the minimum output value Point to the ZERO parameter using F1 When the output has settled rotate the control wheel until the actual output is as close as possible to the correct value Fig 107 Point to the SPAN parameter using F1 and press F3 MAXimum to source the maximum output Allow time for the output to settle then rotate the control wheel until the measured output is as close as possible to the correct value Fig 108 Repeat the ZERO and SPAN adjustments until no further adjustment is necessary Check linearity by setting the output to source the CHECK values given in table 7 3 and check that the actual output is within the stated tolerance Repeat the above procedure for each output range Reference junction temperature calibra
18. QUIT to abort If the file is opened the user may then enter the tag name or serial number of the device being calibrated This is done in the same manner as the file name Press F1 DONE when complete or F4 QUIT to abort Fig 50 The primary display will show the LG symbol to indicate that a calibration file is open and that the EZECAL 5 is now ready to store the pre calibration values 4 2 2 Saving a pre calibration point After setting the simulate output to the required pre calibration point on the primary display press the LOG key The PRE CAL RECORD screen will appear M35 Issue 1 20 EZECAL 5 USER MANUAL The current simulate output value is displayed as the INPUT value on the display because it is the input to the unit under test If the unit under test has a measurable output then this output value is displayed as the PRE CAL value Alternatively for display only devices the PRE CAL value is displayed as zero and the engineer should enter the current display reading of the unit under test In either case the values should be saved by pressing F3 SAVE at which point the screen will revert to the primary display Fig 51 The bottom line on the display shows the available memory i space in records Up to forty such records can be entered into one calibration file 4 2 3 Closing the pre calibration record file When all necessary calibration points have been recorded the calibration file should be closed t
19. T TYPE MEASURE UNITS RES TYPE MEASURE RESOLUTION NUMERIC REFERENCE VALUE REF MODE TYPE REFERENCE MODE NUMERIC CONTROL WHEEL SENSITIVITY CALIBRATOR STATUS LOOP TYPE SIMULATE MEASURE LOOP SWITCH MODE TYPE OPERATING MODE SOFTWARE VERSION NUMBER BL MODE TYPE BACKLIGHT MODE ENABLE FRONT PANEL OPERATION DISABLE FRONT PANEL OPERATION NUMERIC MEMORY STORAGE NUMERIC MEMORY RECALL INSTRUMENT SERIAL NUMBER NUMERIC CUSTOM LAW NUMBER NUMERIC CUSTOM BREAKPOINT DATA NUMERIC CUSTOM RANGE NUMBER STRING CUSTOM RANGE NAME PRIMARY TYPE CUSTOM RANGE LAW TYPE CUSTOM RANGE LAW UNIT TYPE CUSTOM RANGE UNITS NUMERIC CUSTOM RANGE DISPLAY HIGH LIMIT NUMERIC CUSTOM RANGE DISPLAY LOW LIMIT NUMERIC CUSTOM RANGE I O HIGH LIMIT NUMERIC CUSTOM RANGE I O LOW LIMIT NUMERIC TEMPERATURE COMPENSATION RATE M35 Issue 1 6 SERIAL COMMUNICATIONS 37 NUMERIC LOGGER TIMEBASE NUMERIC LOGGER STEP NUMBER START LOGGER STOP LOGGER LOGGER STATUS DUMP LOGGED DATA SET CAL RECORD MODE SET LOGGING MODE NUMERIC DATE OF LAST CAL NUMERIC MONTH OF LAST CAL NUMERIC YEAR OF LAST CAL 6 2 3 Variable types NUMERIC A numeric value is a string of characters which represent a numerical value All of the following examples are valid ways of representing the number five 5 5 0 5 05 5 005 0 5 000 and any of these forms will be accepted by the instrument assuming 5 is a valid setting f
20. The replay control screen will appear Fig 40 The STATUS line shows the current replay status either STOPPED or RUNNING The next line shows the programmed replay interval in minutes and seconds in this case 1 minute is set The replay interval may be set as required between 1 second and 10 minutes per step using the numeric keypad or control wheel Fig 41 The replay mode may be toggled between STEP and RAMP 7 using F3 MODE In STEP mode the calibrator will step change the simulate output between the logged data values In RAMP mode the calibrator will ramp the simulate output by interpolating between the logged points every one second This option may be changed while the replay is running Fig 42 M35 Issue 1 4 ADVANCED FEATURES 17 The replay may be started using F1 START or stopped by using F2 STOP While the replay is running both the current step number and the time remaining until the next step is shown on the display To return to the primary screen press the F4 QUIT key The primary display will now indicate that the replay is running by showing a small RP symbol underneath the simulate icon While this is present the simulate output value may not be changed manually 4 2 3 Replay stored data This option is identical to the REPLAY LOGGED option except that the values replayed will be the ten values saved in memory using the STORE key Linking the ten STORED values in this manner enables the
21. and that the paper is correctly aligned Finally press F3 YES if everything is ready for printing or F4 QUIT to abort Fig 61 The print screen will remain until the print out has finished Fig 62 M35 Issue 1 4 ADVANCED FEATURES 23 An example of a typical calibration certificate is shown below All that now needs to be done is to sign and date it CALIBRATION CERTIFICATE TEST EQUIPMENT FGH EZECAL Mk5 SERIAL 11111 EZECAL S W VERSION 2 Via OO KTAS CPN EDATE 3 05 10793 CALIBRATION FILE 2 TIC 112 DEVICE UNDER TES 1865241 ESULTS OUTPUT READING POST CAL degC OF 4 3 3 Dump calibration data The calibration data may be down loaded to a personal computer if the serial communications option is fitted The data is transmitted in serial form using ASCII characters only and is in a format suitable for most popular spreadsheet programmes When this option is selected the file selector menu will appear The file selector shows all the files currently stored within the calibrator in the order that they were created The number of records contained within the file is shown next to the file name To select the file of interest move the triangular pointer with the F1 key and press F2 SELect to select the indicated file If the file required is not shown on the display then press F3 MORE to show the
22. bove at an elevated temperature of 45 C using an environmental chamber and adjust the SPAN parameter if necessary Calibration date After calibration is complete it is important to enter in the date on which the calibration was performed This date will be displayed on the screen every time the unit is switched on From the calibration menu point to ENTER CAL DATE using F1 and press F2 SELect to select Fig 113 M35 Issue 1 7 CALIBRATION 47 Enter the day month and year of calibration by using F1 to point to the parameter and F2 NEXT to increment or use the control wheel Finally press F4 QUIT to return to the calibration menu Fig 114 M35 Issue 1 48 APPENDIX A SPECIFICATIONS A 1 A 2 A 2 General OPERATING TEMPERATURE STORAGE TEMPERATURE HUMIDITY WEIGHT BATTERY LIFE Measurement Inputs ISOLATION OVERLOAD PROTECTION RESOLUTION SERIES MODE VOLTAGE SERIES MODE NOISE REJECTION BASIC LINEAR ACCURACY REFERENCE CONDITIONS COLD JUNCTION ACCURACY INPUT IMPEDANCE RESISTANCE MEASUREMENT CURRENT TEMPERATURE COEFFICIENT 100mV range Simulation outputs ISOLATION OVERLOAD PROTECTION RESOLUTION BASIC LINEAR ACCURACY REFERENCE CONDITIONS COLD JUNCTION ACCURACY M35 Issue 1 EZECAL 5 USER MANUAL 10 C to 45 C 20 C to 45 C 0 to 95 RH non condensing 2 5kg without carrying case Typically 12 hours continuous depending on use All measu
23. ction buttons F1 to F4 change depending upon the screen mode The function key labels tell the operator the purpose of the buttons for the current screen For example in the above illustration F1 is used to change the measure or simulate range BATTERY CONDITION INDICATOR This symbol shows the charge status of the battery pack It is animated in six stages from fully charged completely black to low charge all white and critically low all white and flashing Fig 2 FEATURE KEYS DISPLAY CONTROL WHEEL FUNCTION KEYS NUMERIC KEYPAD Fig 4 The keyboard is split into three areas NUMERIC KEYPAD The numeric keypad is used to enter numeric data in exactly the same way as a calculator Numbers are entered in exactly as written followed by the ENTER key The decimal point position is taken care of automatically depending on the circumstances Mistakes can be rectified simply by re entering the correct value and pressing ENTER M35 Issue 1 1 INTRODUCTION 3 CONTROL WHEEL INCREASE Alternatively any number which can be entered via the numeric keypad may be entered by turning the control wheel Turning the knob clockwise increases the displayed number and anticlockwise decreases the number The rate at which the displayed number changes is dependent on the speed at which the pot is turned so spinning the knob quickly will change the displayed number at several hundred digits per second DECREASE The sensitivity of the control wheel
24. e control wheel Fig 71 Use F1 again to advance the triangular cursor Press F2 or spin the pot to select the range The range selected is the physical range required In our case we require the 20mA range in order to measure the output from the transmitter Fig 72 M35 Issue 1 26 EZECAL 5 USER MANUAL Advance down again and enter the law required In our case the transmitter output is not linear and follows the type K thermocouple law To provide a linear display on the EZECAL 5 we must linearise according to the law TC K Fig 73 Advance down again to select the units that we wish on the EZECAL 5 display using F2 or the control wheel In our case we require degrees Celsius Fig 74 The display resolution parameter merely defines the decimal point position on the display It does not increase the resolution of the calibrator except on TC or RTD ranges In our example we wish to display in tenths degree Celsius So we set the display decimal point position to 0 1 Fig 75 Now it is necessary to specify the limits over which the custom range is to work Press F3 LIMS to enter the custom limit set up screen and select again the range number chosen Fig 76 Use F1 to point to the DISPLAY HI LIMIT This is the maximum number which can appear on the display In our case this is 800 0 C which corresponds to an input signal of 20mA For a simulate range this number should be the highest allowable o
25. e terminals Fig 17 Alternatively an external reference junction may be used In this case the cables from the reference junction should be connected as shown below and the EZECAL 5 set to REF MANUAL with the reference temperature Tref manually entered M35 Issue 1 10 2 9 EZECAL 5 USER MANUAL Fig 18 Transmitter power supply A 24V dc power supply is available to power two wire transmitters or any other current input output device The power supply is current limited to a nominal 25mA 2 10 Hints for accurate low level voltage measurement and simulation When measuring or simulating low voltage levels such as thermocouple signals the user can unwittingly introduce errors into the measurement These errors are usually due to thermal emfs Thermal emfs are small voltages which appear across joints of dissimilar metals If two or more such joints are at differing temperatures then the resultant voltage will be added to the measurement simulation voltage Best results will be obtained by following the simple guidelines given below Always use the correct type of compensating cable for thermocouples that require it and pay particular attention to the polarity red is not always positive Some thermocouples notably type B do not require compensating cable When compensating leads are to be connected directly to the EZECAL 5 the bare wire ends should be firmly clamped under the terminals to allow the EZECAL 5 to make a
26. ear Fig 47 Storing calibration records The alternative use for the logger is to store calibration records This mode of operation is set up from the configuration menu under LOGGER FUNCTION see 5 1 A calibration record is a file stored within the calibrator which records the before and after calibration performance of an instrument or transmitter The EZECAL 5 can store many such files depending on the number of calibration points used within each file Once a calibration file is stored it can be examined dumped to a computer or printed out as a calibration certificate on a suitable serial printer This powerful feature allows many instruments to be calibrated during a day in the field and the results stored within the calibrator Then upon return to the office or car the calibration certificates printed out and signed A typical calibration sequence would consist of the following steps 1 Set up the simulate output and measure input to suit the unit under test For display only devices such as a panel meter set the EZECAL to simulate only mode For devices which have a measurable output such as a transmitter set the EZECAL to simulate measure mode 2 Open a new calibration record file 3 Record the uncalibrated performance of the unit under test at several points within its range 4 Close the calibration record file 5 Calibrate the unit under test 6 Record the calibrated performance of the unit under tes
27. efore attempting to program a custom law e The function curve to be programmed must be strictly increasing ie the output from the lineariser should increase as the input increases e The function curve should have no discontinuities and no regions where the curve is perfectly flat To allow a custom law to be applied to any input or output range the law is always programmed as an output law For example if an exponential type law is programmed for an output then this law will automatically be used in reverse when applied to linearise an input ie it will perform a natural logarithm type law M35 Issue 1 4 ADVANCED FEATURES Consider the following example 29 The user wishes to measure and simulate an Iron Gold Chromel cryogenic thermocouple This is not a standard thermocouple in the EZECAL 5 and so must be programmed as a custom range with a custom law The thermocouple has the following characteristic Temp Input EMF Output Temp Input EMF Output 270 C 4 714mV 235 C 4 181mV 267 C 4 666mV 230 C 4 111mV 265 C 4 634mV 225 C 4 041mV 260 C 4 555mV 220 C 3 973mV 255 C 4 478mV 215 C 3 906mV 250 C 4 402mV 210 C 3 839mV 245 C 4 327mV 205 C 3 774mV 240 C 4 254mV 200 C 3 709mV The custom law should therefore convert a linear temperature input to a shaped millivolt output Further so that this law may be applied to any input or output range for example to measure the output
28. enu will appear The file selector shows all the files currently stored within the calibrator in the order that they were created The number of records contained within the file is shown next to the file name To select the file of interest move the triangular pointer with the F1 key and press F2 SELect to select the indicated file If the file required is not shown on the display then press F3 MORE to show the next page of files Fig 58 The calibration records are shown one point at a time The user can scan through the records by pressing F1 NEXT to show the next point or F2 PREVious to show the previous point The record number shown will end around to 1 at the end of the list If the POST CAL value is shown blank then the post cal figure was not saved for that calibration point Press F4 QUIT to return to the cal record replay screen Fig 59 4 3 2 Print calibration certificate When this option is selected the file selector menu will appear The file selector shows all the files currently stored within the calibrator in the order that they were created The number of records contained within the file is shown next to the file name To select the file of interest move the triangular pointer with the F1 key and press F2 SELect to select the indicated file If the file required is not shown on the display then press F3 MORE to show the next page of files Fig 60 Ensure that the printer is connected on line
29. he POST CAL value will appear blank and the value displayed on the unit under test should be entered manually using the keypad or control wheel Press F3 SAVE to store the value in memory POST CAL values which have been saved are indicated by a star appearing before the displayed value Press F1 NEXT to advance to the next calibration point Again the EZECAL 5 will automatically set the simulate output to the correct value ready for the operator to enter or save the post calibration reading as before Fig 56 Continue using F1 NEXT or F2 PREVious until all post calibration points have been done Press F4 QUIT to return to the primary display Retrieving calibration records There are three ways in which stored calibration files can be retrieved pey The calibration data can be shown one point at a time on the EZECAL 5 display 2 The calibration data can be down loaded to a personal computer via the serial communications option if fitted 3 The EZECAL 5 can be connected to a suitable serial printer and a calibration certificate can be printed out To perform any of these three options from the primary display press the REPLAY key and the CAL RECORD REPLAY screen will appear Select the option required using F1 to move the cursor and F2 SELect to select the indicated option Fig 57 M35 Issue 1 22 EZECAL 5 USER MANUAL 4 3 1 Show calibration file When this option is selected the file selector m
30. he charge rate will be reduced and the recharge time will be significantly lengthened For optimum battery performance the batteries should be run down to their minimum operating level before recharging M35 Issue 1 4 EZECAL 5 USER MANUAL SECTION 2 CONNECTIONS 2 0 Terminals On the top of the EZECAL 5 are two rows of terminals Each terminal can accept a 4mm banana type plug or be used to clamp the bare end of a wire The terminal function is indicated on the label and in the figure below Fig 6 2 1 Voltage Measurement The unit under test is connected directly to tte COM and V terminals shown For low level voltage measurements on the 100mV range see section 2 10 for hints on accuracy Fig 7 2 2 Current Measurement Devices which can source current such as controller outputs and mains powered transmitters may be measured by connecting them to the l and COM input terminals M35 Issue 1 2 CONNECTIONS 5 DEVICE UNDER TEST R1 COM Fig 8 Other devices such as loop powered transmitters are only capable of sinking current and hence require a power supply in order to work For this type of device the integral power supply should be wired in series with the current loop DEVICE UNDER TEST R1 COM Fig 9 2 3 Resistance RTD Measurement The resistor or resistance thermometer to be measured should be connected in 3 wire mode as shown For the highest precision the 3 w
31. ires used should be of the same gauge and length This allows the measurement to compensate for the resistance of the lead wires A two wire measurement may be made by shorting together terminals R2 and R3 and connecting the resistor to be measured between terminals R1 and R2 In this case however the displayed resistance will include the resistance of the lead wires M35 Issue 1 6 EZECAL 5 USER MANUAL O TO 400 OHMS Fig 10 2 4 Thermocouple Measurement There are two modes of thermocouple measurement available depending on the location of the reference junction For thermocouples wired in compensating cable the cables should be directly connected to the voltage measurement terminals and the EZECAL 5 should be set to REF INTERNAL For best results the compensating wire tails should be bare wire and should be tightly clamped under the terminals THERMOCOUPLE Alternatively an external reference junction may be used In this case the cables from the reference junction should be connected as shown and the EZECAL 5 set to REF MANUAL with the reference temperature Tref manually entered M35 Issue 1 2 CONNECTIONS 7 COMPENSATING CABLE THERMOCOUPLE Fig 12 2 5 Voltage Simulation Connect up the unit under test to the V and V terminals as shown For simulation on the 100mV range pay particular attention to the guidelines given in section 2 10 Fig 13 2 6 Current Simulation The current output termina
32. is adjusted dynamically by the EZECAL 5 to suit the type of value actually being changed and the overall sensitivity speed of response may be Fig 5 adjusted as desired from the configuration menu see 5 3 FUNCTION KEYS These four keys are used to select functions dependent upon the screen currently shown Their function is indicated at all times by the function key labels on the bottom line of the display FEATURE KEYS These four keys provide access from the primary display to the STORE RECALL LOG and REPLAY features described in later sections 1 2 Batteries The EZECAL 5 has a fixed internal NiCad battery pack This battery pack is inaccessible to the user and cannot be replaced by dry cells The useful life of the batteries depends on the use of calibrator To obtain the longest use from one charge the user should observe the following guidelines e Switch off the calibrator when not in use e Use the backlight only when necessary e Use the 24V transmitter supply only when power is unavailable elsewhere The internal battery pack must be recharged using the power supply adaptor provided To charge the batteries simply plug the adaptor power lead into the power jack at the rear of the instrument With the instrument switched off recharging will take approximately 14 hours Do not charge for significantly longer than this as damage may be caused to the batteries The instrument may be used whilst the battery is recharging however t
33. isplay will indicate that a recall cycle is in progress Using the numeric keypad press the number of the memory that you wish to recall and the stored value will immediately appear as the simulate output value Press another number key and a different stored value will appear Finally exit from RECALL mode press the RECALL key again M35 Issue 1 14 EZECAL 5 USER MANUAL SECTION 4 ADVANCED FEATURES 4 0 Logging The EZECAL 5 logger can operate in one of two modes MEASUREMENT v TIME The logger will log the value of the measured input at fixed time intervals CALIBRATION POINTS The logger will store calibration data files 4 1 The logger function is set up under the configuration menu see 5 1 Measurement versus time logging In this mode the logger will record the value of the measured input at preset time intervals 400 such logs can be made and the data obtained can be replayed in graphical form output from the simulate output or down loaded via the serial communications option into a personal computer for later analysis Once started the logging continues to operate in the background until 400 logs have been made or is manually stopped While the logger is running the calibrator may continue to be used in the normal way Before the logger can be started the log interval must be entered From the primary display press the LOG key and the logger control display will appear The STATUS line shows the current logger s
34. ld be left switched on under standard reference conditions for at least two hours before calibration To gain access to the calibration mode remove the security label from the baseplate of the calibrator to reveal a small hole With the instrument switched on press the button at the bottom of the hole by means of slim blunt object The EZECAL 5 will then enter CALIBRATION MODE Enter the correct PIN number and press ENTER to gain access to the calibration menu Fig 100 Use F1 to move the cursor and F2 SELect to select input or output calibration as required Fig 101 Input calibration There are individual calibration adjustments for each of the five basic input ranges and an additional adjustment for the input cold junction temperature sensor The calibration of the input ranges may be performed in any order Each range has a ZERO and SPAN parameter which should be adjusted individually via the control wheel M35 Issue 1 7 CALIBRATION 43 Calibration should be performed at the points given in table 7 2 Table 7 2 Input calibration points RANGE ADJUST ZERO AT ADJUST SPAN AT CHECK AT CHECKAT TOLERANCE 100mV 0 000mV 100 000mV 10 000mV 50 000mv 0 000mV 1 00000V 100 000mV 500 00mv 0 000mV 10 0000V 1 0000V 5 0000V 2001 V 0 000mA 20 0000mA 8 0000mA 12 0000mA 0 0000 400 0000 150 0000 250 0000 Connect the reference input source to the appropriate terminals see section 2 Low thermal emf
35. ls l and l do not source current and so the internal 24V power supply should be connected in series as shown to provide loop power An existing supply may be used as in a two wire transmitter loop In this case connection need only to be made to the I and I terminals M35 Issue 1 8 EZECAL 5 USER MANUAL Fig 14 2 7 Resistance RTD Simulation For the most accurate resistance simulation the unit under test should be connected using the four wire method shown below This method cancels out the resistance of the wiring Pay particular attention to the polarity of the measurement current sourced from the unit under test NOTE When calibrating instruments with scanning inputs such as chart recorders the scanning should be turned off such that the instrument under test is constantly measuring the input to which the EZECAL 5 is SESSO Fig 15 If the unit under test employs a three wire measurement technique then connect the wires as shown below M35 Issue 1 2 CONNECTIONS 9 SODO Fig 16 2 8 Thermocouple Simulation There are two modes of thermocouple simulation available depending on the location of the reference junction For connection in compensating cable to the unit under test the cables should be directly connected to the voltage simulation terminals and the EZECAL 5 should be set to REF INTERNAL For best results the compensating wire tails should be bare wire and should be tightly clamped under th
36. n accurate reference junction temperature measurement Avoid the use of banana plugs if possible but if they are to be used then handle them lightly by the plastic part to avoid warming them up Wait for several minutes after wiring to allow time for the temperature of the connections to equalise before making the measurement This will reduce any thermal emf effects which do occur M35 Issue 1 3 OPERATION 11 SECTION 3 OPERATION 3 0 Operating mode The EZECAL 5 has three primary operating modes To change the mode simply press F2 MODE 3 1 MEASURE ONLY MODE In this mode the display shows only the measured input Although the simulated output is still functioning SIMULATE ONLY MODE In this mode the display shows only the simulate output value To change the simulate output enter the new value via the numeric keypad or rotate the control wheel as required SIMULATE MEASURE MODE In this mode both the simulated output and the measured inputs are shown As in simulate only mode the simulated output may be entered at any time If F4 LOOP is pressed then the simulate output value is forced to numerically equal the measured input value This fact is indicated by the line now drawn between the input and the output icons This mode is useful when the ezecal is used as a conversion tool eg to convert signals between different thermocouple types To exit from loop mode simply press F4 LOOP again
37. ng a suitable 3 pin DIN plug wired as shown TRANSMIT OU COMMON RECEIVE IN VIEW ON REAR OF INSTRUMENT Fig 96 Protocol The EZECAL 5 command protocol is based on short subcommand mnemonics which can be strung together according to the command tree given in section 6 2 2 Each basic subcommand consists of a colon followed by a four character mnemonic to signify the parameter of interest One or more subcommands strung together in a precisely defined way form a command The complete command is terminated in a carriage return character ASCII code 13 decimal at which point the command will be executed by the calibrator There are three basic types of command READ COMMAND The command string is followed by a query symbol for example MEAS VALU lt CR gt would be sent to read the current measured input value WRITE COMMAND The command string is followed the an equals symbol and the required value for example SIMU VALU 1000 lt CR gt would be sent to write the value of 1000 to the simulate output SET COMMAND The command string is simply terminated in carriage return for example KEYB DISB lt CR gt would be sent to disable the front panel of the calibrator M35 Issue 1 6 SERIAL COMMUNICATIONS 35 In each case the EZECAL 5 will respond with the command string followed by the read or write data The response message will always be terminated with carriage return ASCII code 13 decimal 6 2 1
38. o provide loop power for 2 wire transmitters The EZECAL 5 is a high precision instrument and as such must be recalibrated regularly at least once per year to maintain optimum performance For the users convenience the date of the last calibration is shown on the display every time the unit is switched on The integral high capacity battery pack makes the instrument suitable for both field use providing up to 10 hours continuous operation from one charge and laboratory work using the mains power supply adapter In the field the EZECAL 5 can store around 200 calibration measurements or log 400 values for later retrieval back at the office where the optional RS232 interface may be use to print calibration certificates or dump logged data into a PC spreadsheet for analysis 1 1 Display andKeyboard When first switched on the display shows the instrument serial number and the date of the last calibration Fig 2 After 5 seconds this display is replaced by the primary working screen BATTERY CONDITION MESSAGE LINE SIMULATED VALUE OUTPUT ICON lt gta on WERE T SIMULATE RANGE INPUT ICON 0 T MEASURED VALUE NS MEASUREMENT RANGE FUNCTION KEY LABELS Fig 3 M35 Issue 1 2 EZECAL 5 USER MANUAL The primary display of the calibrator is divided into four main areas MESSAGE LINE Shows prompt messages for the STORE and RECALL facilities FUNCTION KEY LABELS The purpose of the four fun
39. o save away all the pre calibration data Once the file is closed it may not be re opened and the pre calibration points may not be edited From the primary display press the LOG key to access the pre calibration record screen The display will show the number of records which have been saved Press F1 CLOSE to close the file or F4 QUIT to return to the primary display Fig 52 4 2 4 Recording post calibration data Once the unit under test has been calibrated the calibrated performance should be recorded From the primary display press the LOG key and point to POST CAL RECORDS using F1 and select using F2 SELect Fig 53 Point to the required file from the menu by using F1 and then press F2 SELect to select the indicated file If more than six files are stored then press F3 MORE to display the next page Fig 54 M35 Issue 1 4 4 3 ADVANCED FEATURES 21 When the file has been selected the post calibration record screen will appear The EZECAL 5 will automatically set the simulate and measure ranges to those set at the time when the pre cal records were stored and the simulate output will be set to source the INPUT value shown For devices with a measurable output the POST CAL value will show the current output from the unit under test When this value has settled press the F3 SAVE key to store the post calibration value for that calibration point Fig 55 For display only devices t
40. or the parameter being written In certain circumstances the instrument will truncate the number received if it exceeds the resolution of the parameter being written For example on the 100mV range a received simulate value of 5 0001 mV will be truncated to 5 00 the maximum resolution in the 100mV range In all cases the response from the calibrator will show the exact value used STRING A string value is just a sequence of alphanumeric characters enclosed in inverted commas The received string will be converted to uppercase characters and either padded out or truncated to the required length for the particular parameter being written String values sent in responses will always be padded out with spaces to the correct length Example CUSR NAME fred lt CR gt Would result in the current custom range name being set to FRED CUSR NAME FRED lt CR gt Would be returned from the EZECAL 5 RANGE TYPE Any command which uses a RANGE TYPE parameter implies the use of one of the following range mnemonics to indicate a simulation or measurement range M35 Issue 1 38 EZECAL 5 USER MANUAL TC S Thermocouple type S TC R Thermocouple type R TC J Thermocouple type J TC K Thermocouple type K TC T Thermocouple type T TC E Thermocouple type E TC B Thermocouple type B TC N Thermocouple type N TC W Thermocouple type W TC W3 Thermocouple type W3 TC W5 Thermocouple type W5 TC L Thermocouple type L TC NIMO Thermocouple type NiMo PT100
41. rement terminals are galvanically isolated from all other terminal to 250V ac All inputs are overvoltage protected to 250V ac 1 part in 55000 of range 25 of range voltage RMS at 50 or 60Hz Better than 70dB at 50 or 60Hz 90 day 0 02 of range at reference conditions 20 C 2 C and 40 RH 0 25 C in INTERNAL mode gt 10Mo 900 approx Voltage ranges Current range 0 25mA Typically 30ppm of reading 11 V per C 50ppm of reading 11 V per C maximum All measurement terminals are galvanically isolated from all other terminal to 250V ac All outputs are overvoltage protected to 250V ac Resistance output is fuse protected at 24V dc 1 part in 55000 of range 90 day 0 02 of range at reference conditions 20 C 2 C and 40 RH 0 25 C in INTERNAL mode 6 APPENDIX 49 A 3 OUTPUT IMPEDANCE Voltage ranges Current range lt 0 10 gt 10Mo RESISTANCE SIMULATION CURRENT RANGE 0 1mA to 5 0mA for stated accuracy TEMPERATURE COEFFICIENT Typically 30ppm of reading 1pV per C 50ppm of reading 1pV per C maximum Ranges and standards Thermocouples to BS4937 TC S Thermocouple type S Pt10 Rh Pt TC R Thermocouple type R_ Pt13 Rh Pt TC Thermocouple type J Fe CuNi TC K Thermocouple type K NiCr NiAl TC T Thermocouple type T Cu CuNi TC E Thermocouple type E NiCr CuNi TC B Thermocouple type B Pt30 Rh Pt6 Rh TC N Thermocouple type N NiCrSi NiSi
42. splay only the measured value MODE MEAS lt CR gt Would be returned from the EZECAL 5 M35 Issue 1 6 SERIAL COMMUNICATIONS PRIMARY TYPE 39 This parameter type is used to select one of the primary linear input or output ranges 100MV 1V 10V 20MA 4000HM Example CUSR RNGE 20MA lt CR gt CUSR RNGE 20MA lt CR gt 100mV linear voltage range 1V linear voltage range 10V linear voltage range 20mA linear current range 400R linear resistance range Would set a custom range to measure or simulate linear current Would be returned from the EZECAL 5 UNIT TYPE This parameter type is used to select display units CEL K MV MA KOHM PCT KPA TORR HZ Ww VA Example MEAS UNIT lt CR gt MEAS UNIT OHM lt CR gt LAW TYPE Used to select the type of lineariser to be used on a custom range LINEAR TC S TC J TC T TC B TC W TC W5 TC NIMO NI100 CUSLAW1 CUSLAW3 Example CUSR LINR ROOT lt CR gt CUSR LINR ROOT lt CR gt C FAR F K R R mV V V mA OHM O ko NONE blank PSI psi kPa BAR Bar Tor RPM RPM Hz KHZ kHz W KW kW VA KVA kVA Would read the current measurement units Returned would indicate current measurement units are Ohms Linear law SQUARE Square law TC type S law TC R TC type R law TC type J law TC K TC type K law TC type T law TC E TC type E law TC type B law TC N TC type N law TC type W law TC W3 TC type W3 law TC type W5 law TC L TC
43. t M35 Issue 1 4 ADVANCED FEATURES 19 7 Repeat steps 1 to 6 on other units 8 Print out and sign calibration certificates 4 2 1 Opening a calibration record file Before any records can be stored the calibration file must be opened This merely consists of giving the file a name The file name is a string of up to seven characters and would normally be the tag name or serial number of the instrument to be calibrated File names need not be unique but in this case it is up to the user to distinguish between identically named files Files are stored in memory and each file occupies 24 bytes plus 6 bytes per record From the primary display press the LOG key and the cal record menu screen will appear The amount of free memory is displayed in bytes at the bottom of the screen Point to OPEN NEW FILE using F1 and press F2 to select Fig 48 The EZECAL 5 will invite you to enter the name of the new file Initially the file name will be set to UNNAMED and this may be overwritten as required The file name is entered one character at a time using the numeric keys control wheel or F2 NEXT All alphanumeric characters and punctuation may be used in the file name The character being entered is indicated by the flashing underline cursor When the correct character is displayed press the ENTER key to advance to the next character position or F3 CLeaR to blank the character When complete press F1 OPEN to open the file or F4
44. tatus either STOPPED or RUNNING The next line shows the programmed log interval in minutes and seconds in this case 1 minute is set Fig 32 This value may be set as required using the numeric keypad or the control wheel between one second and ten minutes Fig 33 The logger can now be started by pressing F1 START The display will now show two additional pieces of information The number of logs made and the time remaining before the next log is made Use F2 STOP to stop the logger if required Fig 34 M35 Issue 1 4 4 2 4 2 1 Display log graph ADVANCED FEATURES 15 To return to the primary screen press the F4 QUIT key The primary display will now indicate that the logger is running by showing a small LG symbol underneath the measure icon Fig 35 Retrieving logged data Logged data may be retrieved in one of three ways It may be shown on the display as a graph It may be replayed in real time from the simulate output or may be down loaded to a personal computer via the serial communications option The replay option required is selected by pressing REPLAY from the primary screen From the replay options screen move the cursor to SHOW LOG GRAPHusing the F1 key and press F2 SELect to select the log graph display The graph y axis is automatically scaled to accommodate the range of the logged values and the first one hundred logs are shown across the display If the logger is actually r
45. tion The EZECAL 5 has two reference junction temperature sensors fitted into the R1 COM measurement reference and V I output reference terminals The calibration for these sensors should not usually require adjustment but their calibration may be periodically checked as follows Measurement reference junction sensor Clamp a precision temperature measurement probe under the R1 COM terminal and leave to stabilise for at least 10 minutes From the INPUT CALIBRATION MENU point to COLD JUNCTION using F1 and select by pressing F2 SELect Fig 109 M35 Issue 1 46 EZECAL 5 USER MANUAL 7 5 The C J temperature shown should match that of the precision temperature probe 0 2 C If not then point to the ZERO parameter using F1 and adjust using the control wheel if absolutely necessary Fig 110 Repeat the above at an elevated temperature of 45 C using an environmental chamber and adjust the SPAN parameter if necessary Simulation reference junction sensor Clamp a precision temperature measurement probe under the V I terminal and leave to stabilise for at least 10 minutes From the OUTPUT CALIBRATION MENU point to COLD JUNCTION using F1 and select by pressing F2 SELect Fig 111 The C J temperature shown should match that of the precision temperature probe 0 2 C If not then point to the ZERO parameter using F1 and adjust using the control wheel if absolutely necessary Fig 112 Repeat the a
46. type L law TC type NiMo law PT100 Pt100 RTD law Ni100 RTD law ROOT Square root law Custom law 1 CUSLAW2 Custom law 2 Custom law 3 CUSLAW4 Custom law 4 Would set the current custom range to use a square root law Would be returned from the EZECAL 5 M35 Issue 1 40 EZECAL 5 USER MANUAL BL MODE TYPE This parameter type is used to select the mode operation for the display backlight OFF Backlight always off TIMED Backlight comes on for 15 seconds ON Backlight is permanently on Example BLGT lt CR gt Would read the current backlight mode BLGT TIMED lt CR gt Would be returned to indicate that the backlight was in timed mode LOGGER STATUS TYPE This parameter type is used to return the status of the logger STOPPED The logger is not running RUNNING The logger is running Example LOGR STAT lt CR gt Would read the current logger status LOGR STAT RUNNING lt CR gt Might be returned to indicate that the logger is currently running 6 2 4 Error codes If for any reason the EZECAL 5 cannot process the received message an error message will be returned The error message is of the form ERROR NNNN lt CR gt where NNNN is a hexadecimal error code The binary weighting of the error code is as follows Bit The selected parameter may not be written to An illegal suffix number was received The command string was too long for the EZECAL 5 The received command was not recognised An illegal numeric character was recei
47. unning while the graph is shown then the graph will automatically be updated with any new values as they are logged Fig 37 A vertical cursor line is provided in order to read off the time and value at the point where the cursor intersects the graph The cursor is positioned using the control wheel and the associated elapsed time in days hours minutes and seconds is shown below the graph along with the actual input value at that time If the cursor is moved to the far right of the graph then the next page of logged points will be displayed Fig 38 M35 Issue 1 16 EZECAL 5 USER MANUAL To show more detail the user may zoom in on the graph using F1 IN This will cause the y axis to expanded by a factor of 2 and the graph to be centred on the currently selected flashing point Repeated presses of F1 will cause greater magnification up to the maximum limit of ten digits on the y axis To zoom out again use F2 OUT or to centre the flashing point use F3 CENT Fig 39 To exit from the graph display and return to the replay options screen press F4 QUIT 4 2 2 Replay logged data The data recorded by the logger can be replayed via the simulate output Once started the replay will continue automatically at the programmed rate until all of the logged points have been replayed or the replay is manually stopped From the replay options screen move the cursor to REPLAY LOGGED using F1 and select using F2 SELect
48. ustom range is defined it remains resident within the calibrator ready to be called up by name the next occasion it is needed The same custom range may be used for both input and output ranges depending on whether it is called up as a simulation or measurement range M35 Issue 1 4 ADVANCED FEATURES 25 Example of a custom range Consider a head mounted thermocouple transmitter which accepts as its input a type K thermocouple and outputs a non linearised 4 20mA signal over the range 200 C to 800 C Checking the calibration of such a transmitter over its range would normally involve a lot of tedious calculations using look up tables EZECAL 5 makes this task simple by the use of a custom range Programming the range Custom ranges are defined under the CUSTOM RANGE option on the configuration menu To illustrate the setting up procedure we take the above thermocouple transmitter as our example From the primary display press F3 CONFigure and then select CUSTOM RANGES Fig 69 Select a spare range number or pick an existing range to be overwritten using F2 NEXT or the control wheel Fig 70 Press F1 DOWN ARROW to advance down to the range name Enter the required name for the range The name is entered one character at a time The current character is indicated by the flashing underline cursor and may be moved by pressing the ENTER key To change the character above the cursor use the numeric keypad or spin th
49. utput value which can be set on the display Fig 77 M35 Issue 1 4 ADVANCED FEATURES 27 Use F1 again to point to the DISPLAY LO LIMIT This is the minimum number which can appear on the display In our case this is 200 0 C which corresponds to an input signal of 4mA For a simulate range this number should be the lowest allowable output value which can be set on the display Fig 78 Now point to the INPUT OUTPUT HI LIMIT This is the maximum physical input or output value which will appear at the instruments terminals In our case this is 20 000mA which corresponds to the DIS HI value of 800 C For a simulate range this number should be the maximum physical output value to be sourced Fig 79 Now point to the INPUT OUTPUT LO LIMIT This is the minimum physical input or output value which will appear at the instruments terminals In our case this is 4 000mA which corresponds to the DIS LO value of 200 C For a simulate range this number should be the minimum physical output value to be sourced Fig 80 Next we have the temperature compensation parameter This is only applicable to non standard thermocouple inputs or outputs and should be set to the appropriate cold junction compensation rate in millivolts per degree Celsius For example a type K thermocouple would require a temperature compensation rate of approximately 0 040 mV C Fig 81 The custom range configuration is now complete and this ne
50. ved The selected parameter may not be read The numeric value received was out of range There was a parity error in the received message NOVO 0 2A0N 0 Example The command MEMY12 0 lt CR gt will generate the error message ERROR 0002 lt CR gt indicating that 12 is an illegal suffix for that parameter M35 Issue 1 6 SERIAL COMMUNICATIONS 41 6 2 5 Status Codes The STAT command is returns a four digit hexadecimal number containing status information about the calibrator The binary weighting of the status code is as follows Bit 0 Simulate value out of range 1 not used 2 Simulate reference junction temperature out of range 3 Simulate lineariser error Bits 4 to 7 not used 8 Measurement over range 9 Measurement under range 10 Measure reference junction temperature out of range 12 Measure lineariser error 6 3 Notes The following notes should be considered when configuring the EZECAL 5 via the serial communications e To avoid the possibility of interaction the front panel should be disabled using the KEYB DISB command before configuration starts e When setting up custom ranges ensure that the instrument display is not showing the CUSTOM RANGE SETUP or CUSTOM LIMIT SETUP screens else the range data may not be stored Again use the keyboard disable command to avoid this e When reading or writing custom range or custom law data the range or law number required should first be written using
51. vels to suit the taste of the operator From the configuration menu select POT SENSITIVITY The response speed may now be increased using F2 FASTer or decreased using F1 SLOWer The current setting may be tested on the TEST VAL number displayed on the screen Fig 94 Communications If the serial communications option is fitted this must be set up to suit the computer or printer to be used There are two parameters which must be set BAUD RATE Communications speed OFF 300 600 1200 2400 4800 or 9600 Baud PARITY Odd 7 bit data 1 odd parity bit Even 7 bit data 1 even parity bit None 8 bit data bit 7 always false From the configuration menu select COMMUNICATIONS Use F1 to move the cursor to either BAUD RATE or PARITY and press F2 NEXT or spin the control wheel to modify the indicated parameter Fig 95 M35 Issue 1 34 EZECAL 5 USER MANUAL SECTION 6 SERIAL COMMUNICATIONS 6 0 6 1 6 2 General The EZECAL 5 may be fitted with a serial communications option This option provides an RS232 serial interface for connection to a computer terminal or serial printer When connected to a computer it is possible to control the EZECAL 5 remotely enabling it to be used in an automatic test calibration system This section describes the protocol necessary for remote control Connections The RS232 interface connector is situated at the rear of the instrument Connections should be made usi
52. w range is now available for selection by name from the simulate or measure range selection screens To complete our example of calibrating the thermocouple transmitter the following steps are required Connect the transmitter to the EZECAL 5 as shown below M35 Issue 1 28 4 6 EZECAL 5 USER MANUAL R1 COM VA Fig 82 Select K 4T020 as the measurement range and TC K as the simulate range Set 200 0 C as the simulate output value and adjust the zero control on the transmitter until the measured input reads 200 0 C Set 800 0 C as the simulate output value and adjust the span control on the transmitter until the measured input reads 800 0 C Check the transmitter output at any mid points required Programming custom laws Another powerful feature of the EZECAL 5 is ability to accept custom laws A custom law defines how the calibrator is to linearise an input signal or to characterise an output signal Up to four custom law definitions can be stored at any one time and any law may be used in association with any custom range A custom law is implemented inside the EZECAL 5 as set of straight line segments which approximate to the shape of the curve required Up to 15 such line segments may be used within one law The junction of two adjacent line segments is called a breakpoint and these breakpoints may be positioned anywhere in the range of the instrument There are a few important points to consider b
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