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MC140i User Manual pdf

1. Function Range Value A Frequency Hz Deviation allowed value A DC 2 0 A 1 0 0 025 A DC 2 0 A 1 0 0 025 A AC 2 0 A 1 0 60 0 060 A DC 10 0 A 10 0 0 040 A DC 10 0 A 10 0 0 040 A AC 10 0 A 10 0 60 0 160 Table VIII Frequency test Function Range Value Hz Frequency Hz Deviation allowed value FREQ 1 kHz 1000 0 0 005 Table IX Operation Manual v33 47 MC 140i Multifunction Calibrator Powertek System control The calibrator includes RS232 serial line System connectors are located at the rear panel For the remote control to work properly bus parameters must be set in the system menu For RS232 bus communication speed can be set 150 to 19200 Bd and software handshake XON XOFF can be set RS232 bus properties To transfer the data using RS232 bus 8NI data format is used i e each data word includes 8 bits no parity and one stop bit The communication speed can be set using the system menu Available values 150 300 600 1200 2400 4800 9600 and 19200 Bd Software handshake communication control XON XOFF can be set to control the transfer of the data through the bus RS 232 connector layout 4 5 Pin Label Direction Note 2 TXD output transmitter 0000 E g 3 RXD input receiver 5 GND ground 9 pin connector D SUB FEMALE Cable between the calibrator and PC configuration 1 1 c pswi psw MG
2. If query is sent M140 returns HIGH if the 50 turn coil is deactivated or HI50 if it is activated Example OUTP ISEL HI50 lt cr gt activates the 50 turn coil OUTP ISEL cr the calibrator returns HIGH or HI50 SOURce subsystem This subsystem allows to control the individual functions of M140 calibrator Keyword Parameters Operation Manual v33 49 MC 140i Multifunction Calibrator Powertek SOURce VOLTage LEVEI IMMediate AMPLitude lt DNPD gt CURRent LEVEI IMMediate AMPLitude lt DNPD gt EARTh VOL Tage lt CPD gt ON OFF 0 1 CURRent lt CPD gt ON OFF 0 1 TEMPerature UNITS lt CPD gt C CEL K SCALe lt CPD gt TS68 TS90 THERmocouple LEVEI IMMediate AMPLitude lt DNPD gt RIUNction lt DNPD gt TYPE lt CPD gt B E J K N R S T SOUR VOLT LEVE IMM AMPL lt DNPD gt This command activates the generation of DC or AC voltage depending on the DC or SIN parameter of the FUNC command lt DNPD gt Represents the value of DC or AC voltage expressed in Volts Negative value is accepted for DC voltage Technical Data chapter lists the acceptable ranges If query is sent M140 returns the set value of current using standard exponential format Example 20 547mV is returned as 2 054700e 002 Positive numbers are not preceded with sign SOUR CURR LEVE IMM
3. AMPL lt DNPD gt This command activates the generation of DC or AC current depending on the DC or SIN parameter of the FUNC command lt DNPD gt Represents the value of DC or AC current expressed in Amperes Negative value is accepted for DC current Technical Data chapter lists the acceptable ranges If query is sent M140 returns the set value of current using standard exponential format Example 20 547mA is returned as 2 054700e 002 Positive numbers are not preceded with sign SOUR EART VOLT CPD ON OFF 0 1 This command connects or disconnects the voltage Lo terminal to from GND terminal e ON or 1 grounds the voltage output e OFF or 0 ungrounds the voltage output If query is sent M140 returns ON when the output is grounded or OFF when ungrounded Example EART VOLT 1 cr grounds the voltage output terminals EART VOLT cr the calibrator returns ON or OFF 50 Operation Manual v33 Powertek MC 140i Multifunction Calibrator SOUR EART CURR lt CPD gt ON OFF 0 1 This command connects or disconnects the current Lo terminal to from GND terminal e ONor 1 grounds the current output e OFF or 0 ungrounds the current output If query is sent M140 returns ON if the current terminals are gronded or OFF if ungrounded Example EART CURR 1 cr grounds the current output terminals EART CURR lt cr gt the calibrator returns ON or OFF SOUR FREQ
4. CW lt DNPD gt This command sets the frequency being generated Examples AC voltage frequency FUNC SIN VOLT lt DNPD gt FREQ lt DNPD gt lt cr gt AC current frequency FUNC SIN CURR lt DNPD gt FREQ lt DNPD gt lt cr gt Digital frequency FUNC SQU FREQ lt DNPD gt lt cr gt lt DNPD gt Represents the frequency in Hz Technical Data chapter lists the acceptable ranges which depend on the selected function mode If query is sent M140 returns the set value of the current using standard exponential format Example 20 5kHz is returned as 2 050000e 004 SOUR TEMP UNIT lt CPD gt C CEL K This command sets the unit of measurement of temperature e CorCEL sets Centigrade e K sets Kelvin The unit of measurement remains valid after the calibrator is switched off If query is sent M140 returns the set unit of measurement C K SOUR TEMP SCAL lt CPD gt TS68 TS90 This command sets one of temperature scales The setting influences the simulation of resistance temperature sensors and thermocouples e TS68 sets IPTS 68 temperature scale e TS90 sets ITS 90 temperature scale The temperature scale remains valid after the calibrator is switched off If query is sent M140 returns the set temperature scale TS68 TS90 SOUR TEMP THER LEVE IMM AMPL lt DNPD gt This command activates the simulation of thermocouples DC
5. MC 140i Multifunction Calibrator Powertek LAdNI JOLBAUDO DL fld JOUSAUOD UBLING DAY 19 ec N09 Ot L A WIDIBDIP x2olg Xopppduuoos Saup esues ONKC MIO SL SPO LU Smog A SPOLU SMJ JOUCO epngduny Jeulduupo jueuno Jolojeues Eus asoud SPOLU ema Spouu EMO PUB Elljduuo Ssusg padue Jojo ueb dsl secun yeund a preno In um allea lojbzelAs BUI ge AZ SDUD Jolozajufs SE OJALO Dif AG JS pawo soues SA A Oc SBune YOO ALL Od OG A GOOL SEUI JBLUO SUD AIL Od JBLUO SUD IL 4 OVAOO0L Bucy PA OV 4 A0oz e uny ADE OW Ja ce Jaljduo A 00g 37 Operation Manual v33 MC 140i Multifunction Calibrator Powertek 2 20V DC voltage ranges The functional scheme is shown in the picture below LI D convertor Hi i 20 V amplifier Lo There is a DC reference voltage source integrated within the 22bit measurement converter Its output is fed to the output stage for 2 and 20 V range Output voltage present at Hi and Lo terminals is sensed by sensing wires Feedback eliminates the influence of amplifier s output impedance and of the resistance of wires within the calibrator 200 V DC voltage range The block diagram functional scheme is shown in the picture below D convertor 20 amplifier The scheme is similar to 2 and 20 V ranges A 240
6. 0 V 6 0 0 005 V DC 20 0 V 8 0 0 004 V DC 20 0 V 10 0 0 004 V DC 20 0 V 12 0 0 004 V DC 20 0 V 14 0 0 004 V DC 20 0 V 16 0 0 004 V DC 20 0 V 18 0 0 004 V DC 20 0 V 19 0 0 004 Table I DC voltage test Function Range Value V Frequency Hz Deviation allowed value V DC 2 0 V 1 9 0 004 V DC Zi Oi M 1 9 0 004 V DC 240 0 V 190 0 0 004 V DC 240 0 V 240 0 0 003 V DC 240 0 V 190 0 0 004 V DC 240 0 V 240 0 0 003 V DC 1000 0 V 1000 0 0 010 V DC 1000 0 V 1000 0 0 010 Table II 20 V AC Basic range with linearity test Function Range Value V Frequency Hz Deviation allowed value V AC 20 0 V 2 0 1000 0 075 V AC 20 0 V 4 0 1000 0 050 V AC 20 0 V 6 0 1000 0 042 V AC 20 0 V 8 0 1000 0 037 V AC 20 0 V 10 0 1000 0 035 V AC 20 0 V 12 50 1000 0 033 V AC 20 0 V 14 0 1000 0 032 V AC 20 0 V 16 0 1000 0 031 V AC 20 0 V 18 0 1000 0 031 V AC 20 0 V 19 0 1000 0 030 Table III Operation Manual v33 45 MC 140i Multifunction Calibrator Powertek AC voltage test Function Range Value V Frequency Hz Deviation allowed value V AC 20 mV 0 019 1000 0 358 V AC 200 mV 0 19 1000 0 142 V AC 2 0 V 1 59 1000 0 030 V AC 20 0 V 19 0 50 0 030 V AC 20 0 V 19 0 120 0 030 V AC 20 0 V 19 0 10000 0 030 V AC 20 0 V
7. 19 0 20000 0 082 V AC 20 0 V 19 0 50000 0 082 V AC 240 0 V 190 0 1000 0 036 V AC 1000 V 750 0 12 0 0 057 Table IV 200 mA DC Basic range with linearity test Function Range Value A Frequency Hz Deviation allowed value A DC 200 0 mA 0 02 0 040 A DC 200 0 mA 0 04 0 025 A DC 200 0 mA 0 06 0 020 A DC 200 0 mA 0 08 0 018 A DC 200 0 mA 0 10 0 016 A DC 200 0 mA 0 12 0 015 A DC 200 0 mA 0 14 0 014 A DC 200 0 mA 0 16 0 014 A DC 200 0 mA 0 18 0 013 A DC 200 0 mA 0 19 0 013 A DC 200 0 mA 0 02 0 040 A DC 200 0 mA 0 04 0 025 A DC 200 0 mA 0 06 0 020 A DC 200 0 mA 0 08 0 018 A DC 200 0 mA 0 10 0 016 A DC 200 0 mA 0 12 0 015 A DC 200 0 mA 0 14 0 014 A DC 200 0 mA 0 16 0 014 A DC 200 0 mA 0 18 0 013 A DC 200 0 mA 0 19 0 013 Table V DC current test Function Range Value A Frequency Hz Deviation allowed value A DC 200 0 uA 0 00019 0 061 A DC 200 0 uA 0 00019 0 061 A DC 2 0 mA 0 0019 0 025 A DC 2 0 mA 0 0019 0 025 A DC 20 0 mA 0 019 0 013 A DC 20 0 mA 0 019 0 013 Table VI 46 Operation Manual v33 Powertek MC 140i Multifunction Calibrator AC current test Function Range Value A Frequency Hz Deviation allowed value A AC 200 0 uA 0 00019 60 0 161 A AC 2 0 mA 0 0019 60 0 081 A AC 20 0 mA 0 019 60 0 055 A AC 20 0 mA 0 019 120 0 055 A AC 20 0 mA 0 019 1000 0 055 A AC 20 0 mA 0 019 1000 0 055 A AC 200 0 mA 0 19 60 0 055 Table VII AC DC high current test
8. If set to ON time and date are displayed in the upper part of the display If OFF is set time and date are not displayed ON is set by the manufacturer Operation Manual v33 25 MC 140i Multifunction Calibrator Powertek Calibration mode The multifunction calibrator includes a calibration procedure which allows calibration of the calibrator Zero point and slope of the characteristics of individual generation and measurement ranges are set during the calibration in predefined order The calibration can only be controlled using the buttons and menu on the calibrator Calibration principles The calibrator can be calibrated completely i e all functions are calibrated in all recommended points partially i e only selected functions are calibrated in all recommended points partially i e only selected functions are calibrated in selected points Complete calibration consists of all partial calibrations performed in the order defined by the calibration menu If an item of the calibration menu e g VOLTAGE DC is selected it is not necessary to calibrate all ranges defined by the calibration algorithm If new calibration of all ranges is not possible e g the required standard is not available old calibration data can be confirmed i e current step of the calibration can be skipped Calibration interruption can be performed in any point of the calibration procedure However this particular calibration influences paramet
9. be connected directly to the front panel terminals If L terminal of the instrument to be calibrated is not grounded then calibrator s Lo terminal should be grounded GND U ON see Setup menu chapter Connection of a multimeter to be calibrated voltage range to calibrator s output terminals Current ranges All DC and AC current ranges are connected to calibrator s I I terminals When using the current output under heavy load 10 to 20 A the runtime is limited to 0 to 60 s The runtime depends on the set current and it is controlled by the microprocessor The user cannot extend the runtime if longer runtime is required the output terminals must be unloaded some time must elapse for examplel min and the load can then be connected again 54 Operation Manual v33 Powertek MC 140i Multifunction Calibrator When feeding 2 to 20 A current to the output terminals the output voltage must not exceed approx 1 5 Vef If the current induces higher voltage on the load the calibrator disconnects the output terminals and displays an error message When ammeters are being calibrated using currents over 1 A it is important to connect the terminals properly paying attention both to the calibrator s output terminals and the instrument s input terminals Excessive contact resistance can heat up the terminals and cause calibration errors Excessive and unstable contact resistance has non linear characteristic and can distort the output
10. calibrator is controlled remotely it is not possible to disconnect the output voltage using the buttons located at the front panel The calibrator must be first switched to local control mode by pressing the LOCAL button and then the output terminals can be disconnected or the mains switch must be switched off 18 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Generation of calibrated current The multifunction calibrator provides calibrated DC and AC current Output terminals for voltage ranges are labeled I and I at the front panel The terminals can carry high current and are the only terminals to which the calibrated object can be connected Depending on the setting of the calibrator current up to 20 Agr can be driven by the terminals DC current range is 0 to 20 A AC current range is 1A to 20 A When 50 turn coil option 140 50 is used AC current range is 50uA to 1000 A Control in the current mode Press T button on the calibrator and then select AC or DC mode by pressing DC AC button The display shows the following data main data of set current relative deviation uncertainty of output current frequency when AC current is generated total value of output current when non zero absolute or relative deviation is set time after which the output terminals will be disconnected when the output current over 10 A is selected X X X X X Set the desired value of
11. has 0 to 1 and 0 to 1 conversion ration and allows the simulation of resistance and capacitance values different from the range impedances The output stage increases the permitted current load of the output ATTENTION The simulator s output voltage Hi Lo terminals is limited to 8 Vpk Frequency synthesizer Frequency synthesis circuitry allows fine setting of frequency in the whole calibrator s range Frequency synthesis uses DSP circuits with basic frequency 20 MHz 40 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Calibrator s maintenance The multifunction calibrator is electronic instrument with microprocessor control All blocks which are heavily loaded during the operation are cooled by a fan Rules for correct operation Especially the following rules should be adhered to guarantee correct operation of the calibrator e The calibrator can only be switched on and off by pressing the mains switch located at the rear panel Do not connect the calibrator to other voltage than set by the voltage selector e Do not block the vent openings located at the rear panel and bottom panel e The calibrator must not be operated in dusty environment It was designed to be used in a laboratory e No liquid or small objects can be permitted to enter the calibrator through the vent openings e Do not switch the calibrator outside its operating temperature range e Connect the instruments to be calibrated t
12. is set to 00000 this information is displayed in the Setup menu Calibration code can be changed New calibration code can be directly entered using numeric keyboard and confirmed by pressing ENTER If non zero calibration code is set correct calibration code must be entered to access the calibration mode Non zero calibration code is not displayed further on the display The purpose of the calibration code is to prevent unauthorized users from changing the calibration of the instrument 16 18 2868 12 56 SETUP MENU Keub volume Brightness Rotary change Switch polarity Switch activitu Note 24 Operation Manual v33 Powertek MC 140i Multifunction Calibrator It is advisable to write down actual calibration code if changed If you forget the calibration code you have to send the calibrator to the manufacturer 20 Cal date xx yyyy Displays the date of last calibration of the calibrator month year The parameter cannot be changed as it 1s automatically recorded when leaving the calibration mode 21 Serial No xxxxxx Displays the serial number of the calibrator The parameter cannot be changed 22 Time xx yy Displays real time The parameter can be changed using HOUR UP HOUR DO MIN UP MIN DO display buttons 23 Date xx yy zzzz Displays real time The parameter can be changed using DAY UP MONTH UP YEAR UP YEAR DO display buttons 24 Time on display xx ON OFF
13. using cursor keys e keep pressing the center cursor button until symbols appear under the relative deviation value e press lt gt or v button The display now includes cursor marks which point to the active digit e and v buttons can be used to change the active digit lt gt buttons can be used to change the position of the cursor marks e to get to the default screen keep pressing the center cursor button until there is no ________ under any value or press EXIT button All values can be set using the buttons or the potentiometer If a non zero relative deviation is set the main data can be changed as well The value of the output signal is always recalculated If a zero relative deviation is set the minor data section is not displayed Change of value by factor of ten All functions of the calibrator allow the increase of the output value by 10 or reduction of the output value by 10 Such operation is equivalent to the change of internal range only in U I modes If the change results in overflow or underflow of calibrator s range an error message appears Value too large if the resulting value is too large Value too small if the resulting value is too small Operation Manual v33 15 MC 140i Multifunction Calibrator Powertek Connection disconnection of output terminals After switching on the output terminals are disconnected in all modes Press the OUTPUT button to connect the output signal
14. voltage including polarity when necessary frequency and relative deviation The signal is yet not connected to the output terminals The information section of the display shows the symbol which informs about the disconnection of output terminals OFF Connect the load or short the output terminals labeled I I Press OUTPUT button Information section of the display shows the symbol mm Calibrated current corresponding to set parameters is driven by the output terminals If COILx50 function is activated see below Setup functions menu the optional 50 turn coil must be connected to output terminals The calibrator can be used to calibrate 50 UA to 1000 A ammeters The calibrator generates AC and DC current within the range up to 20 A CAUTION If GND terminal is connected to Lo I terminals it is prohibited to connect external load to GND Hi or GND I terminals Such connection can damage the calibrator Operation Manual v33 19 MC 140i Multifunction Calibrator Powertek Overloading the terminals When external circuit connected to current output terminals is disconnected or there is higher voltage at the lo ad than permitted the calibrator disconnects the output terminals and displays Overload I output message The same message can be displayed when 50 turn coil is used for AC current output at frequencies above 80 Hz It depends on the set current and the type of ammete
15. voltage generation Operation Manual v33 51 MC 140i Multifunction Calibrator Powertek lt DNPD gt Represents the temperature expressed in the units set by the UNIT command Technical Data chapter lists the acceptable ranges If query is sent M140 returns the set temperature using standard exponential format Example 20 5 C is returned as 2 050000e 001 SOUR TEMP THER RJUN lt DNPD gt This command sets the temperature of cold end of thermocouple lt DNPD gt Represents the temperature expressed in the units set by the UNIT command Technical Data chapter lists the acceptable ranges Example to set the temperature of cold end of thermocouple to 25 C TEMP THER RJUN 25 lt cr gt If query is sent M140 returns the set temperature using standard exponential format Example 20 5 C is returned as 2 050000e 001 SOUR TEMP THER TYPE lt CPD gt B E J K N R S T This command sets the type of thermocouple to be simulated Example to activate the simulation of S type thermocouple at 350 C TEMP THER 350 TEMP THER TYPE S lt cr gt If query is sent M140 returns the set type thermocouple B E J K N R S T J VD instrument identification IDN This command returns the identification of the manufacturer model serial number and firmware revision The reply is formatted as follows Powertek MC 140 412341 4 6 Operation complete OPC lt cr gt This comma
16. 0 mA test AC DC high current ranges 2 A 20 A test Frequency nominal value 1 kHz test Distortion checking of AC voltage range 20 V Procedure Following part describes procedure of performance verification test Recommended measuring points are the same as the points in table of limits see tables bellow l 2 10 11 Connect the calibrator to the mains and let them switched on for at least one hour in a laboratory at 23 1 C Connect voltage input of the standard multimeter to the voltage output terminals of the calibrator Set appropriate parameters on the standard multimeter to achieve its best accuracy Perform 20 VDC linearity DC voltage 20 VAC linearity AC voltage tests according to the tables I II III IV Deviations should not exceed specified limits Connect current input of standard multimeter to the current output terminals of the calibrator Set appropriate parameters on the standard multimeter to meet its best accuracy Perform 200 mADC linearity DC current AC current tests according to the tables V VI VII Deviations should not exceed specified limits Connect current output terminals of the calibrator to the current terminals of resistance shunt 100 mOhm Connect voltage input of standard multimeter to the voltage terminals of the resistance shunt Set range 100 200 mV on standard multimeter Perform AC DC high current test on range 2 A according to the table VIII Deviation should not exceed specif
17. 1 Use or v cursor button or the knob of the potentiometer to browse the menu options Active option is always inverted and when changed the descriptions of display buttons change as well Display buttons show how the respective parameter can be set Each parameter can be changed after the knob of the potentiometer is pressed Press EXIT display button twice to save the parameters when the setting is completed New settings are retained when the calibrator is switched off Setup menu offers the following options 1 Coil x50 xx ON OFF This parameter can be set on when 50 turn current coil is going to be used for clamp ammeter calibration The coil multiplies the output current OFF is set by the manufacturer 2 GND U xx ON OFF This parameter connects Lo terminal to GND In practice this means that Lo terminal is grounded By pressing the display buttons the terminal can be grounded or ungrounded ON is set by the manufacturer output terminal is grounded 3 GNDI xx ON OFF This parameter connects I to GND In practice this means that I terminal is grounded By pressing the display buttons the terminal can be grounded or ungrounded OFF is set by the manufacturer output terminals are not grounded It is recommended to ground only the voltage channel GND U ON GND I OFF for all ranges except the generation of power or energy If the meter to be calibrated has Lo terminal grounded it is recommended to unground both outp
18. A with full load Safety class I according EN 61010 ed 2 Used external fuses F4L250V 1 pes Used internal fuses F1 6L250V 3 pes F200mL250V 2 pes F2 5L250V 2 pes 58 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Accessories Basic accessories included in delivery e Power line cord I pe e Operation manual l pc e Test report I pc e Spare fuse 2 pe e Test cable 1000V 20A Im 2 pe e Cable RS RS 232 cable I pe Options extra ordered e 140 50 Current coil 25 50 turn e Option 10 Output cable 20A 1000V black e Option 11 Output cable 20A 1000V red e WinQbase SW for calibration of instrument e Caliber Program module for multimeters Manufacturer For Uk amp European sales support service and deliveries For USA sales support service and deliveries Powertek UK 19 Cornwallis Road Bilton Rugby CV22 7HL UK Powertek US Inc 7 Third Street Holbrook NY 11741 USA New Tel 01788 519911 Fax 0870 0940135 Tel 1 631 615 6279 Fax 1 973 273 5893 Int l Tel 44 1788 519911 Int l Fax 44 870 0940135 Email info powertekuk com www powertekuk com Email Info powertelus com www powerlekue com Operation Manual v33 59
19. AC current It is not recommended to connect non standard load to the current output The calibrator is designed to be used for calibration of ammeters Output terminals should be loaded with low and real impedance Although the output is fitted with fast electronic and microprocessor protection high capacitance or inductance can lead to oscillations of output amplifiers and result in damage The instrument to be calibrated can be connected directly to the front panel terminals If L terminal of the instrument to be calibrated is not grounded then calibrator s U I terminal should be grounded GND U ON GND I ON see Setup menu chapter Optional current coil can extend the calibrator s current range to 1000 A The coil can be used for calibration of both DC and AC ammeters The clamps of the ammeter must be positioned in angle 90 to the coil When using the current coil no steel or other magnetic objects must be present in the vicinity 50 cm of the current coil as they would deform the magnetic field and cause big calibration error Connection of current coil 5 H Current coil Opt 140 50 Thermometers The calibrator can be used for calibration of transducers used in thermometers and heat meters which use a thermocouple sensor The block connected to the sensor is checked as it is disconnected from the transducer and the calibrator s output is connected to the transducer s input instead Simulation of thermal sensor is ac
20. M Tama ea FE DE Transmitter rransmite E dS free SSCS Command syntax The commands described in this chapter can be issued through both buses IEEE 488 and RS232 All commands listed in this chapter are explained in two columns KEYWORD and PARAMETERS KEYWORD column includes the name of the command Each command includes one or more keywords If a keyword is in brackets it is not mandatory Non mandatory commands are used only to achieve compatibility with language standard SCPI Capitals designate the abbreviated form of the commands extended form is written in lowercase Command parameters are in brackets lt gt each parameter is separated using a comma Parameters in brackets are not mandatory Line means or and is used to separate several alternative parameters Semicolon is used to separate more commands written on one line E g VOLT 2 5 OUTP ON Note Each command must end in cr or 1f Both codes lt crlf gt can be used at the same time The calibrator performs all commands written on one line of the program after it receives cr If or lt crlf gt code Without this code the program line 1s ignored 48 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Description of abbreviations lt DNPD gt Decimal Numeric Program Data this format is used to express decimal number with or without the exponent lt CPD gt Character Prog
21. MC 1 401 Multifunction Calibrator Powertek Operation Manual MC 140i Multifunction Calibrator Powertek 2 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Content Operation Manual NR 1 Basic Information latina 5 Preparation for Operall0N zzui indiana aiar 6 Inspecting package contents selecting the installation location sorrsorssorssonssonssonssonnsonnsnnnsnnnne 6 ln iJeo m een 6 Warmc u p m 5 des IR RR I SI IA NV EH S ERU Ted 6 Ju3uEIauT3dEnBlltispee c M 6 Safety precautions EU 7 Description of controls 8 Front panel DE 8 Rear PAM e 12 ControLojithe calibiaior is piaga 13 Selection of function P 13 Setting the value of output signal eere ecce nese se eresie ereceeerce nese senresne ricca etas etos esten ases see 13 Setting relative deviation 4 eere e eee eee e eren eene nane re nee zena nicee nese ne sense setas nesn seen s esce neereneneceenso 14 Change of value by factor of ten srrrerrrrrrrrerererce eese eee e esee eerte seta stone setas necen sese senese nresenenecceneo 15 Connection disconnection of output terminals eere eee e essent neeeseerecene scenari see resenezioneno 16 Settimo the ATEQUCNCY vecsisvinc
22. O command Unlocked calibrator can be returned to local control mode by pressing LOCAL button Operation Manual v33 53 MC 140i Multifunction Calibrator Powertek Examples of use Calibration of measurement instruments The calibrator can be used for direct calibration of various instruments which measure electrical values Opt 140 01 cable adapter is recommended The cable adapter includes a temperature sensor which allows the measurement of external temperature Measured value can be displayed by pressing INPUT button Multimeters The calibrator can be used for calibration of digital and analogue multimeters DCV ACV DCI ACI resistance capacitance temperature frequency and duty cycle Voltage ranges Thanks to low output impedance and high output current the calibrator can be used for calibration of analogue voltmeters and milivoltmeters having low input impedance Voltage output is connected to Hi Lo terminals The calibrator does not allow the four wire connection of the instrument to be calibrated It is not recommended to connect non standard load to the voltage output The calibrator is designed to be used for calibration of voltmeters Output terminals should be loaded with high and real impedance Although the output is fitted with fast electronic and microprocessor protection high capacitance or inductance loads can lead to oscillations of output amplifiers and result in damage The instrument to be calibrated can
23. V power amplifier with electronic fuses is connected to the output of 20 V amplifier 200 amplifier Hi La 2 to 200 V AC voltage ranges The functional scheme is shown in the picture below DA Error Feedback convertor amplifier amplifier Generator 38 Operation Manual v33 Powertek MC 140i Multifunction Calibrator The calibrator s built in generator generates a sine wave with voltage controlled amplitude The frequency is derived from microprocessor control circuit s crystal oscillator The signal is fed to 20 V or 200 V amplifier and then to output terminals Feedback circuits sense the voltage present at the output terminals normalize its value and detects it This results in a signal corresponding to average value of the output voltage This signal is further filtered and compared to the set value of output voltage The error value controls the amplitude of the generator s output 20mV and 200 mV voltage ranges 20 mV and 200 mV voltage ranges are derived from 2 and 20 V voltage ranges D convertor 20 amplifier The output of the amplifier is fed to an inverting attentuator with 1 100 nominal division ratio The signal is then led to the output terminals sensed via local feedback This connection allows to load the calibrator output with output current of several mA without losing accuracy 1000 V AC DC voltage range The highest voltage range of the calibrator uses 200 V amplifier It is co
24. ains plug Using the SETUP MENU of the calibrator the output terminals of the calibrator can be grounded as well Grounding is done internally by connecting Lo and GND terminals using a relay This circuit design is suitable for most calibrations when the object multimeter being calibrated is floating Front panel display shows all information provided by the calibrator e g set parameters of the signal error messages setup information The display is divided to several information sections Operation Manual v33 9 MC 140i Multifunction Calibrator Powertek 7 Display 18 18 2888 12 15 10 00000 U Ad BE ABBAS 16G60 00 Hz 1 1334 Setup la Ib Ic ld le 3 2b Ig If The display is divided to three horizontal sections 1 OUTPUT section This section displays the set up values of generated signals and the data related to the calibrator status The section includes the following types of data a Information line e designation of display section OUTPUT error messages The messages appear when an attempt is made to set up an invalid state of the calibrator if analogue circuits of the calibrator are overloaded or if a communication error occurs when the calibrator is controlled using GPIB bus e real date and time if its display is set up in the setup menu b Auxiliary data This line displays the total value of output signal if a non zero relative deviation is set c Main data This line displays the main data of the out
25. as Lo terminal grounded it is recommended to un ground both outputs of the calibrator GND U OFF GNDI OFF to exclude ground loops If it is grounded neither calibrator nor standard meter higher level can occur on the output terminals In general when calibrator is connected to the standard meter ground loops can be arise through power line connection Ground loops can result apparently worse noise short term stability or non harmonic distortion of output signal If necessary use toroidal chokes to suppress this products In all other items in SETUP MENU the setting of parameters don t influence accuracy of the calibrator Use sin waveform of the output signal on all AC tests Performance verification may be performed after warm up period i e 1 hour after switching on Calibrator have to be in temperature stabilize condition at minimum 8 hours before performance verification test is started Basic steps of the performance verification test Verification procedure consists of following steps e 20 V DC voltage test with linearity check Operation Manual v33 43 MC 140i Multifunction Calibrator Powertek DC voltage internal ranges 20 mV 200 mV 2 V 240 V 1000 V test 20 V AC voltage test with linearity check AC voltage internal ranges 20 mV 200 mV 2 V 20V 240 V 1000 V test 200 mA DC current test with linearity check DC current internal ranges 200 uA 2 mA 20 mA test AC current internal ranges 200 uA 2 mA 20 mA 20
26. button 20 Operation Manual v33 Powertek MC 140i Multifunction Calibrator The display shows the symbol of connected output terminals 8 5 2H8HH 12 44 0100 0 C AT h BIC RJ 623 0 C TC type T Accuracy H 4 C Note Load of output terminals is limited similarly to corresponding voltage or current ranges Entry of cold junction temperature For thermocouples the temperature of cold junction can be entered The entry is performed by setting the RJ field in the auxiliary data section of the display e Select the thermocouple mode and keep pressing the center cursor button until symbols appear under the RJ xxxx x C value if C unit of measurement is used or under RJ xxxx x K value if K unit of measurement is used e Set the value using numeric keyboard e Confirm the value by pressing C or K display button or by pressing ENTER 8 6 2088 12 46 0100 0 C AT AHHA A C TC type T Accuracy H 4 C MERE UN Operation Manual v33 21 MC 140i Multifunction Calibrator Powertek Setup menu The multifunction calibrator allows some other less frequently used parameters to be set Setup menu is used to set these parameters Setup menu is opened by pressing SETUP display button If output terminals are connected they will be disconnected and the following display appears 1H 18 288H 12 52 SETUP MENU Coil x5H Temp scale Temp unit Phase unit Output 148 4
27. calibrator to be used primarily as a standard for calibration laboratories It can be used for calibration of any measuring instrument which measures voltage and current The calibrator includes a function which simulates thermocouple temperature sensors Basic features of the calibrator include generation of calibrated DC and AC voltage in the range of 0 uV to 1000 V DC and AC current in the range of 0 uA to 20 A 50 uA to 1000 A when using a 50 turn coil Maximum precision of the calibrator is 0 0035 for DC voltage 0 03 for AC voltage 0 013 for DC current and 0 055 96 for AC current Maximum frequency range is 20 Hz to 100 kHz Simulation of thermocouple temperature sensors can be used to calibrate thermometers and heat sensing units The calibrator allows the simulation of all common R S B J T E K N type of thermocouples Compensation of cold junction of thermocouple is achieved by entering the respective temperature using the calibrator s keyboard The accuracy of simulated temperature sensors depends on the value and type of sensor and ranges from 0 4 9C to 4 3 9C The calibrator includes many other features which facilitate easy use For example relative deviation from set value of the output currently displayed uncertainty of the output signal calibration and internal testing procedures The concept of calibrator control and indication of its status is based on flat luminiscent display which provides all necessary informati
28. curacy 4 8332 If too large or too small value is entered the calibrator displays the maximum minimum value which is allowed for the selected function 16 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Generation of calibrated voltage The multifunction calibrator provides calibrated DC and AC voltage Output terminals for voltage ranges are labeled Hi and Lo at the front panel Depending on the setting of the calibrator voltage up to 1000 Vef can be present at the terminals DC voltage range is 0 to 1000 V AC voltage range is 100 uV to 1000 V Control in the voltage mode Press U button on the calibrator and then select AC or DC mode by pressing DC AC button The display shows the following data main data of set voltage relative deviation uncertainty of output voltage frequency when AC voltage is generated total value of output voltage when non zero relative deviation is set Xo X X 0X X Setthe desired value of voltage including polarity when necessary frequency and relative deviation The signal is yet not connected to the output terminals The information section of the display shows the symbol OFF which informs about the disconnection of output terminals Press OUTPUT button Information section of the display shows the symbol mm Calibrated voltage corresponding to set parameters is present at the output terminals C
29. e current output of the calibrator if this feature is turned on using the SETUP menu e information about the type of connected cable adapter if used e information about the grounding method of output terminals GND I GND U as set up using the setup menu g Information about the uncertainty of the output signal This section displays the maximum error of the main value of the output signal The value is calculated using the main specification listed in the User s Manual and it is displayed in 96 2 INPUT section This section displays the values measured by the multimeter It is not available in MC 1401 version 3 Display buttons section This line displays the symbolic descriptions which define the meaning of four related display buttons The respective meanings are as follows symbol button function increase set value 10 x decrease set value 10 x reversed polarity of output voltage and current only for DC U DC I functions enter the calibration menu enter the setup menu selection of thermocouple sensor type only for T function enter the frequency of the signal only for U I function Operation Manual v33 11 MC 140i Multifunction Calibrator Powertek Rear panel The rear panel of the calibrator includes ventilation holes power cord socket with fuse mains voltage selector mains switch IEEE 488 connectors for connection to GPIB bus and type plate with serial number air inl
30. ear panel e Insert the blade of a flat screwdriver into the opening cut in the mains voltage selector and pry out the fuse holder Operation Manual v33 41 MC 140i Multifunction Calibrator Powertek e Remove the fuse Replace it with new fuse of the same rating if the fuse was broken e Replace the fuse holder reconnect the power cord and switch on the calibrator If the problem persists contact the manufacturer If an obvious fault is evidenced e g a measurement range or an operating mode is not functional the user cannot correct the fault Contact the manufacturer Hidden faults can cause different symptoms and be caused by different causes Usually they cause instability of some parameter Hidden defects can be caused by unacceptable distortion degraded insulation etc In this case contact the manufacturer Sometimes it seems that the calibrator has hidden defect when the rules for correct operation are not adhered to In this case the fault is caused by the operator Most frequent cases of false hidden defects mains voltage out of tolerance limits or unstable e wrong grounding of the measurement circuit bad connection of the ground terminal of the mains outlet or several ground connection when grounding loops are formed e proximity to sources of intensive influence whose products are spread through the mains or propagated by the electromagnetic field e strong electrostatic or electromagnetic field which ca
31. ed 200 1000 V ranges overloaded Current output overloaded Too high internal temperature RC simulator overloaded Internal error Cable adapter tried to be exchanged while output terminals was ON Bad calibration code Attempt to start calibration before warm up Internal error Internal error Internal error Maximum value is out of limit Minimum value is out of limit Deviation is too high Change of polarity is not allowed Negative polarity is not allowed DC AC conversion is not possible Time limit for current over 10 A exceeded Output current is too high Increase load resistance Output current is too high Increase load resistance Output current is too high Increase load resistance Voltage on the load is too high Decrease load resistance Output stages are overloaded Do not use ranges 200V 1000V or 20 A for at least 10 minutes Check if the ventilation holes are free Test current is too high Use lower range of tested Ohmmeter Turn off the calibrator and turn on it again Switch off output terminals with button OUTPUT change the adapter and switch output terminals on Wrong calibration code was entered calibration cannot start Enter correct calibration code Attempt to start calibration before 60 minutes warm up period Let the calibrator turned on for at least 60 minutes Internal error of the calibrator Turn the calibrator off and after 5 s turn on If the error will appear a
32. ers of the calibrator Accuracy of the calibrator is guaranteed when full calibration was done DC voltage calibration is performed by setting the zero and slope of the scale in all ranges and in both signal polarities and except the 1000 V range where zero correction is not necessary AC voltage calibration is performed by setting the zero and slope of the scale in all ranges at 1000 Hz except the 1000 V range where the calibration is performed at 500 Hz DC current calibration is performed by setting the zero and slope of the scale in all ranges and in both signal polarities and AC current calibration is performed by setting the zero and slope of the scale in all ranges at 1000 Hz except the 20 A where the calibration is performed at 120 Hz Access to the calibration procedure Calibration code is required to access the calibration procedure e Press SETUP to open the setup menu e Press CALIB display button e Ifan attempt is made to access the calibration procedure within 60 minutes after the calibrator was switched on the calibrator does not open the respective menu and displays the following message instead Err 21 Time warm up xx minutes remain 26 Operation Manual v33 Powertek MC 1401 Multifunction Calibrator e Ifthe calibrator is already on for at least 60 minutes it requests the entry of the calibration code after CAL MODE display button is pressed CALIBRATION MENU Set calibrat
33. es The calibrator needs no calibration of the frequency parameter Operation Manual v33 29 MC 140i Multifunction Calibrator Powertek VOLTAGE DC function zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration slope calibration slope calibration Table DC VOLTAGE VOLTAGE AC function Table AC VOLTAGE Other then recommended frequencies can be used for calibration Specification of the calibrator is valid when recommended frequency is used 30 Operation Manual v33 Powertek MC 140i Multifunction Calibrato CURRENT DC function nominal value A set limits A range A zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration zero calibration zero calibration slope calibration slope calibration Table DC CURRENT CURRENT AC function Table AC CURRENT Other then recommended frequency can be
34. et forced ventilation air outlet forced ventilation RS 232 connector power cord socket with fuse mains voltage selector mains switch type plate N RWND Re 12 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Control of the calibrator Selection of function After the power is switched on and the initial checks complete the calibrator resets to its reference status i e DC voltage output with set value of 10 V and output terminals disconnected The status of the calibrator can be changed using the buttons located at the front panel in one of the following ways 1 Change of function by pressing one of direct function buttons After pressing one of the U I DC AC T buttons the calibrator switches to the desired function mode and resets to the reference or to the most recently used parameter setting 2 Connection disconnection of output terminals After pressing the OUTPUT button the output terminals of the calibrator are connected disconnected 3 Entry to the setup menu After pressing the SETUP button options of the SETUP MENU appear on the display and the display buttons allow the entry to the calibration mode CALIB Previous function is restored by pressing of EXIT display button Setting the value of output signal All function modes allow several methods of setting the main value of the output signal Entry of the value using numeric keyboard e use the numeric keyboard to select the des
35. gain contact manufacturer Internal error of the calibrator Turn the calibrator off and after 5 s turn on If the error will appear again contact manufacturer Internal error of the calibrator Turn the calibrator off and after 5 s turn on If the error will appear again contact manufacturer Attempt to set value over possible range Set correct value Attempt to set value under possible range Set correct value Set deviation is out of limit 30 to 30 Set correct value Attempt to change polarity where it is not allowed Concerned modes ACV ACI Attempt to set negative polarity where it is not allowed Concerned modes ACV ACI Attempt to change parameter AC DC where it is nonsense or where it is not allowed Long term loading current terminals with output current over A 35 MC 140i Multifunction Calibrator Powertek Functional description of the calibrator Basic blocks Basic functional blocks are front panel keyboard LCD display output terminals output voltage amplifier 200 V output voltage amplifier 20 A main board voltage amplifier 2 V voltage amplifier 20 V DC reference voltage with DAC generator feedback circuits phase shift circuits current ranges generator multimeter power line transformer power supply board interface GPIB and RS232 Note List of basic functional blocks contains all blocks of MC 140 model In MC 140i version some of them MISS 36 Operation Manual v33
36. ied limit Connect current output terminals of the calibrator to the current terminals of resistance shunt 10 mOhm Connect voltage input of standard multimeter to the voltage terminals of the resistance shunt Set range 100 200 mV on standard multimeter Perform AC DC high current test on range 20 A according to the table VIII Deviation should not exceed specified limit Perform frequency test according to the table IX Deviation should not exceed specified limit Check harmonic distortion of output signal It should not exceed 0 05 If calibrator is out of limits is in some points of this test appropriate function and range should be recalibrated It is not necessary to recalibrate all functions but only this one which does not meet specification See chapter Calibration mode where recalibration procedure is described 44 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Tables of limits 20 V DC Basic range with linearity test Function Range Value V Frequency Hz Deviation allowed value V DC 20 0 V 2 50 0 008 V DC 20 0 V 4 0 0 006 V DC 20 0 V 6 0 0 005 V DC 20 0 V 8 0 0 004 V DC 20 0 V 10 0 0 004 V DC 20 0 V 12 0 0 004 V DC 20 0 V 14 0 0 004 V DC 20 0 V 16 0 0 004 V DC 20 0 V 18 0 0 004 V DC 20 0 V 19 0 0 004 V DC 20 0 V 2 0 0 008 V DC 20 0 V 4 0 0 006 V DC 20
37. ion code HARA sELECT je een e Enter the correct calibration code using numeric keyboard and press ENTER e fincorrect calibration code is entered an error message appears on the display for approximately 3 seconds Err 20 Bad calib code e If correct calibration code is entered calibration menu appears 14 18 2888 13 88 CALIBRATION MENU MEET Voltage Current Current Select Exit e Use A and v cursor buttons to move the cursor through the list l VOLTAGE DC All DC voltage ranges calibration 2 VOLTAGE AC All AC voltage ranges calibration 3 CURRENT DC All DC current ranges calibration 4 CURRENT AC All AC current ranges calibration Note All the rest functions labeled as N A are not available in MC 140i version Selection of calibration type Operation Manual v33 27 MC 140i Multifunction Calibrator Powertek After the calibration menu is displayed one of partial calibrations can be selected Use and v cursor buttons to move the cursor through the list Having selected the required function to be calibrated press SELECT display button The following data are shown the following example is valid for VOLTAGE DC range CALIBRATION MENU Voltage DC Bml 2Bml m 2B8BmU B U 2 UU A U 28 U B 288 U 200 U 266 U 1kU sELECT call i de The table lists recommended calibration points Having selected the required calibration point using SELECT displa
38. ired value After the first digit is entered symbols of unit of measurements are displayed above the display buttons The monitor line displays the symbols e the same entry can be started by pressing the central cursor button e after the entry is complete the value is displayed on the monitor line press the display button below the desired unit of measurement V mV or uV in the example below e the value is copied to the main display and the monitor line disappears Operation Manual v33 13 MC 140i Multifunction Calibrator Powertek 18 18 2888 12 19 10 00000 U AR BE AGIO 1000 00 Hz Shape Sine Accuracy H 835Z B E Il mu Uu Exit Entry of the value using cursor buttons e press lt gt or v button The display now includes cursor marks which point to the active digit e and v buttons can be used to change the active digit lt gt buttons can be used to change the position of the cursor marks e to get to the default screen press EXIT button or keep pressing the center cursor button until there is no under any value All values can be set using the buttons or the potentiometer Reverse polarity In DC voltage and DC current modes the polarity of the output value can be reversed by pressing display button symbol appears in front of the main data value Setting relative deviation All function modes of the calibrator except frequency mode allow a relative deviation of outp
39. keyboard The keyboard allows the entry of numeric values on the display The central button is used to confirm the selection ENTER CANCEL button can be used to cancel the entry 8 Operation Manual v33 Powertek MC 140i Multifunction Calibrator 4 Function buttons Function buttons can be used to call up the functions of the calibrator directly The following buttons are provided function button DC voltage AC voltage DC current AC current simulation of temperature sensors After the function mode is changed the parameters of the respective function are restored If the respective function was never used the calibrator resets to its reference values Reference values for individual functions are listed below function value parameters DC voltage ES AC voltage f 1000 Hz DC current za AC current f 1000 Hz simulation of temperature sensors TC type R cold junction temperature of TC sensors Type R 5 Output terminal button OUTPUT button is used to connect the output signal of the calibrator to the output terminals The connection is confirmed by symbol on the display 6 Output terminals Output signal of the calibrator is connected to the output terminals Current ranges are connected to I I terminals All other functions voltage temperature sensor simulation are connected to Hi Lo terminals GND terminal is connected to the chassis of the calibrator It is connected to the ground terminal of the m
40. mV 0 2 0 05 20 uV 5 0 20 0 10 20 uV 5 20 0001 mV 200 0000 mV 0 1 0 03 20 uV 5 0 15 0 05 20 uV 5 0 200001 mV 2 000000 V 0 025 0 005 30 0 05 0 01 10 2 00001 V 20 00000 V 0 025 0 005 30 0 05 0 03 10 20 0001 V 240 0000 V 0 025 0 010 30 240 001 V 1000 000 V 0 03 0 02 2 valid for f 1000 Hz value of the range for uncertainty calculation is 200 V in the range 200 to 240 V is frequency limited to 1 kHz 50 kHz 100 kHz 50 kHz 100 kHz 0 10000 mV 20 00000 mV 1 0 0 10 20 uV 20 0001 mV 200 0000 mV 0 3 0 05 20 LV 0 200001 mV 2 000000 V 0 2 0 05 2 00001 V 20 00000 V 0 2 0 05 20 0001 V 240 0000 V 240 001 V 1000 000 V 56 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Auxiliary parameters THD 0 05 200 uV 0 05 300 uV 0 05 0 2 lt 100 mQ lt 100 mQ output impedance 300 pF 150 pF maximal capacitance load T x 3 n parameter includes non linear distortion and non harmonic noise P valid for frequencies to 10 kHz Current summary range DCI 0 pA 20 A with current coil 140 50 to 1000A summary range ACI 1 pA 20 A with current coil 140 50 to 1000 A internal ranges 200 uA 2 mA 20 mA 200 mA 2 A 20 A frequency range 20 Hz to 5 kHz bellow 200 mA 20 Hzto 1000 Hz bellow 20 A frequency resolution 6 digit frequency uncertainty 0 005 wave form sin DCI uncertain
41. n cause major instability during calibration using higher impedance 42 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Verification test Procedure recommended for verifying parameters of the calibrator is described in this chapter During tests it is not necessary access to the interior of the instrument Required equipment Following instruments are required for performance verification test e 81 2 digit multimeter type Agilent 3458A or Fluke 8508A or other type with accuracy 0 001 on DC voltage e resistance shunt 10 MQ 100 MQ Burster 1280 or other type with accuracy 0 01 e counter HP 53181A HO 53130 BM 642 or other with accuracy 0 001 HP8903A Distortion analyzer and scope with bandwidth min 20 MHz are recommended for THD measuring of AC signals Configuration of the calibrator Calibrator should be tested directly from the front panel terminals and without use of terminal adapter 140 01 or 140 41 For build in multimeter testing cable adapters Option 40 and Option 60 are recommended To suppress influence of noise or interference with power line frequency in measuring circuit it is recommended following setting of the calibrator in SETUP MENU e Coil x50 OFF e GNDU ON in capacitance test OFF e GNDI ON in capacitance test OFF Note It is recommended to ground only the voltage channel GND U ON GND I OFF for all ranges except the generation of power or energy If the meter to be calibrated h
42. nd sets the OPC bit in the ESR Event Status Register when all pending operations are complete Operation complete OPC lt cr gt This command returns 1 to the output queue after all pending operations are complete Operation complete OPC lt cr gt 52 Operation Manual v33 Powertek MC 140i Multifunction Calibrator This command returns 1 to the output queue after all pending operations are complete Wait to Continue command WAI lt cr gt Prevents the instrument from executing any further commands or queries until all previous remote commands have been executed Reset RST cr This command resets the calibrator to its initial status Test operation TST cr This command executes an internal self test Return the self test result 0 for pass or 1 for fail Remote control REM cr This command activates the remote control When remote control is active the calibrator ignores all controls from the front panel except LOCAL button Local control LOC cr This command activates the local control using front panel buttons Local control lock LLO cr This command locks out the local control the calibrator cannot be returned to local control by pressing LOCAL button Return to local control can only be performed by a command sent through the bus or by switching the calibrator off and on Local control unlock UNL cr This command cancels the LL
43. ng to the type temperature uncertainty 0 4 to 4 3 C see table bellow Ranges and uncertainties of TC sensor simulation 50 0 0 0 0 1 400 400 0 1000 0 1000 1 1767 0 P essing T 50 0 0 0 0 1 250 0 250 1 1400 0 1400 1 1767 0 omes TO B range cy 4000 8000 800 1 1000 0 1000 1 1500 0 1500 1 1820 0 P essing TO sem ti o os ee or 200 0 100 0 100 1 0 0 0 1 100 0 100 1 400 0 nem Ci o os w mw 250 0 100 0 100 1 280 0 280 1 600 0 600 1 1000 0 owes T 200 0 100 0 100 1 480 0 480 1 1000 0 1000 1 1372 0 p pweswerg m w w ew 200 0 100 0 100 1 0 0 0 1 580 0 580 1 1300 0 ecm ro D du p ow oe ow Uncertainties in the table are maximal uncertainties of TC sensor simulation Actual uncertainty for each set value of simulated temperature is determined by uncertainty of relevant resistance Actual temperature uncertainty is displayed on the calibrator display Actual uncertainties are always lower than those in above table General data Warm up time 60 minutes Reference temperature 23 2 C Range of working temperatures 23 10 C Temperature coefficient Temperature coefficient for temperature outside of Tcal 2 C between 13 C to 33 C is 0 1 x C Dimension 450 x 480 x 150 mm Power line 115 220 230 V 50 60 Hz Power consumption 45 VA without load Max 150 V
44. nnected to a pair of transformers with ca 1 6 transformation ratio DA convertor Error amplifier Feedback amplifier Generator 20 amplifier In 1000 V AC mode the output of 200 V amplifier is transformed and led to the output terminals The output voltage is sensed rectified and compared to reference DC voltage provided by the DA converter error value controls the amplitude of the generator s output so that there is correct voltage at the output terminals In 1000 V DC mode 12 kHz signal is transformed rectified filtered and led to the output terminals The output voltage is sensed equally to 1000 V AC mode amplifier Operation Manual v33 39 MC 140i Multifunction Calibrator Powertek Current converter The current converter and current amplifier form a separate design block based on a transconductivity converter with 10 S nominal conversion ratio R 10R C ER Its input is fitted with ipit a i a Lr e and current in 2 and U2 ca gt power stage 10R R6 R5 R4 R3 R2 R1 V TO Sc A gt A sai rh R2 R3 i R5 BER E i 3 ons u2 Lo O gt b DA convertor power stage o U1 V Lo sLo sHi Hi and Lo are calibrator s output terminals The stage including U1 operating amplifier converts voltage to current U2 is a separation amplifier R1 to R5 and C1 to C3 are range impedance DA converter
45. o proper output terminals There is no way of protecting the calibrator from the damage caused by some improper connections Do not damage the output terminals by plugging in bananas thicker than the terminals were designed for e Whenever possible use the setup menu to ground Lo output terminal GND U ON setup function e Do not overload the power stages by leaving the calibrator switched on with the load connected for a long time especially on 20 A current range and 200V and 1000 V voltage ranges e Ifthe instruments to be calibrated are not connected to calibrator s output terminals using original cables ensure that cables suitable for the calibration voltage and current are used Maximum output voltage can reach 1000 V AC and the maximum output current can reach 20 A AC Regular maintenance The calibrator does not require any special maintenance of electrical or mechanical parts If 1s gets dirty the case and the display can be cleaned by a wool rag moistened with alcohol The calibrator should be calibrated in the recommended 12 month intervals A calibration center should perform the calibration What to do in case of failure If an obvious failure occurs during the operation e g the display is not lit the fan is not turning the calibrator must be switched off immediately First check the fuse located in the power cord receptacle Procedure is following e Remove the end of power cord from the mains connector at the r
46. on The calibrator 1s controlled by opening menus on the display and selection from menus Frequently used functions are assigned direct control keys The calibrator comes with RS 232 serial line which allow the calibrator to be controlled from a PC The calibrator can easily fit within calibration systems featuring CALIBER WinQbase software support ATTENTION The calibrator generates life threatening high voltage The calibrator can only be used in line with this Manual Operation Manual v33 5 MC 140i Multifunction Calibrator Powertek Preparation for operation Inspecting package contents selecting the installation location Basic package includes the following items e Multifunction calibrator e Power cord e Spare fuse T4L250 T T8L250 T e Operation manual e Testreport e Testcable 1000V 20 A 2 pcs e RS232 cable The calibrator should be powered by 230 115 V 50 60 Hz mains It is a laboratory instrument whose parameters are guaranteed at 23 2 C Before powering on the instruments place it on a level surface Do not cover the vents at the bottom side and the fan opening at the rear panel Power on e Before connecting the calibrator to the mains check the position of the mains voltage selector located at the rear panel e Plug one end of the power cord into the connector located at the rear panel and connect the other end of the power cord into a wall outlet e Switch on the mains switch located at
47. ontrol sequence when output voltage over 100 V is selected When output voltage over 100 V is selected the information section of the display shows the symbol which informs that a life threatening voltage will be present at the output terminals If the output terminals ar currently connected they will be disconnected when output voltage over 100 V is selected OUTPUT button must be pressed to reconnect the output signal to the output terminals After the OUTPUT button is pressed an interrupted beep is sound information section of the display shows the symbol notifying the user about the connection of the dangerous output signal to the output terminals Voltage polarity frequency absolute and relative deviation can be set without the outputs being disconnected The output terminals are automatically disconnected when changing between AC and DC ranges or when changing the function mode Overloading of terminals If the output terminals are overloaded or short circuited in the voltage mode the calibrator disconnects the signal from the output terminals and reports Overload U output error Operation Manual v33 17 MC 140i Multifunction Calibrator Powertek ATTENTION DANGEROUS VOLTAGE When working with voltages over 50 V rules for work with dangerous voltage must be adhered to Never touch the measurement circuit when voltage over 50 V is set and output terminals are connected N ATTENTION DANGEROUS VOLTAGE When the
48. output terminals ON c Follow the instructions provided on the calibrator s display and the DCI table to adjust the calibrator s output in the calibration points d To adjust the calibrator s output in the calibration points press SELECT button and use lt gt v cursor buttons or potentiometer to adjust the output current Confirm correctly set value by pressing WRITE display button If you want to skip the calibration point whose calibration you have already entered press SKIP display button e Resistance shunt should be used on 2A 20 A ranges if standard multimeter does not cover this range T AC current ranges calibration a Select CURRENT AC from the calibration menu Set the same function on external multimeter b Follow the instructions provided on the calibrator s display and the ACI table to adjust the calibrator s output in the calibration points c To adjust the calibrator s output in the calibration points press SELECT button and use lt gt v A cursor buttons or potentiometer to adjust the output current Confirm correctly set value by pressing WRITE display button If you want to skip the calibration point whose calibration you have already entered press SKIP display button d Resistance shunt should be used on 2A 20 A ranges if standard multimeter does not cover this range Error messages If an error occurs during the calibrator s operation or control error message is displayed on the display E
49. ponent types The manufacturer is not liable for the damage caused by modification of the construction or replacement of parts with non original ones Safety symbols used on the equipment Warning reference to the documentation Warning risk of electric shock Danger high voltage Operation Manual v33 7 MC 140i Multifunction Calibrator Powertek Description of controls Front panel The front panel of the calibrator includes a flat luminiscent display control buttons and output terminals The following picture shows the control part of the front panel 1 Display buttons There are five buttons below the display whose meaning changes depending on the contents of the display These buttons usually call up the MENU allow range change step logging of values etc 2 Cursor buttons Using these buttons the cursor can be controlled within allowed limits on the display The keyboard includes two buttons lt gt which allow the cursor to be set to the required position at the display The cursor can be moved to the left or right These buttons are usually used to step through the options and to move from one option to another or between the menu levels Numeric values can be set in some control modes as well In these cases the buttons marked v allow the user to increase or decrease the number at the cursor button The central button is used to confirm the selection ENTER or to SELECT from the menu 3 Numeric
50. put signal and the unit of measurement using double size signs The line also includes two symbols V A to define the actual position of the cursor during adjustment of the value lt gt buttons can be used to move the cursor and v buttons to change the value The value can be also changed using the potentiometer d Monitoring line This line displays the numbers entered using the numeric keyboard when the main data are set using the numeric keyboard The information allows the entered information to be checked e Minor data There are two lines displaying the minor data of the output signal especially e set relative deviation from main set value in 96 10 Operation Manual v33 Powertek MC 140i Multifunction Calibrator e frequency for DC voltage current power energy functions e cold junction temperature of TC sensors and the selected type of TC sensor f Information section The information section located in the right part of the display displays additional information related to the selected function e symbol of connected mm or disconnected corr output terminals At the same time a LED located above the OUTPUT button is lit e information about remote local control of the calibrator If the calibrator is controlled remotely REM is displayed If the calibrator is controlled locally using the keyboard LOCAL is displayed e information about the use of 50 turn coil COIL x50 at th
51. r connected If the output terminals are disconnected due to time limitation of output current over 10 A the calibrator displays Current timeout message Simulation of temperature sensors The multifunction calibrator can simulate thermocouple temperature sensors When thermocouples are simulated a simulated voltage corresponding to set temperature sensor type and temperature of cold end of thermocouple is connected to Hi Lo terminals Temperature setting range 250 to 1820 C depending on simulated sensor type Sensor types thermocouple K N R S B J T E Temperature scale ITS 90 PTS 68 Setting the temperature Press T button on the calibrator The main value on the display is set temperature The display shows the following data main data of temperature in C or K sensor type thermocouples K N R S B J T E cold junction temperature of thermocouple sensors labeled RJ set value of relate deviation in labeled AT xxxx x C K Xx xXx the information section shows temperature scale type uncertainty of simulated temperature value of selected temperature sensor type Set the main value of temperature using numeric keyboard cursor buttons or potentiometer Output terminals are disconnected the information section of the display shows the symbol ore which shows that output terminals are disconnected Connect the object to be calibrated to Hi Lo terminals Press OUTPUT
52. ram Data Usually it represents a group of alternative character parameters E g ON OFF 0 1 LS A flag indicating a request for the value of the parameter specified by the command No other parameter than the question mark can be used 2 A flag indicating a request for the parameter specified by the command This command permits a value to be set as well as requested lt cr gt carriage return ASCII code 13 This code executes the program line lt l gt line feed ASCII code 10 This code executes the program line OUTPut subsystem This subsystem allows to control the output terminals of M140 calibrator to activate the four wire output or to switch the calibrator to x50 current coil option 130 50 140 50 Keyword Parameters OUTPut STATe lt CPD gt ON OFF 0 1 ISELection lt CPD gt HIGHi HI50turn OUTP STAT lt CPD gt ON OFF 0 1 This command activates or deactivates the output of M140 calibrator e ONor activates the output e OFF or 0 deactivates the output If query is sent M140 returns ON if the output is active or OFF if it is inactive Example OUTP 1 lt cr gt activates the output OUTP er the calibrator returns ON or OFF OUTP ISEL lt CPD gt HIGH HI50 This command activates or deactivates the 1000A current range using a 50 turn coil e HIGH deactivates the 50 turn coil e HI50 activates the 50 turn coil up to 1000A range
53. rrors can be caused by e incorrect control using the front panel i e attempts to force a prohibited mode e g setting an out of range value overloading of output terminals etc e fault of the calibrator e g internal communication error during the communication between individual functional blocks e incorrect control using RS 232 interface Below you can see a sample error message which appears when too large value is attempted to set up All error messages are displayed in the center of the display Operation Manual v33 33 MC 140i Multifunction Calibrator Powertek FF Local 05 00000 U DC pe r 4a e too large Accuracy H BB5HZ x 18 18 The following table lists all error messages their meaning and simple troubleshooting 34 Operation Manual v33 Powertek MC 140i Multifunction Calibrato label description troubleshooting error Overload 2V 02 Overload 20V 03 Overload 200V 04 05 High temperature Overload I output 06 Overload RC 07 FBK error 08 OUTPUT must be in OFF state 20 Badcalib code 21 Time warm up 30 Internal RxD timeout 31 Internal communication 37 Calibrator is not ready 40 Value too large 41 Value too small 42 Deviation too large 44 Unable 45 Unable polarity 46 Unable DC AC 47 Current timeout Operation Manual v33 2V range overloaded 20 V range overload
54. s of the selected function If you press EXIT button before completing the calibration the calibrator returns to the calibration menu Termination of calibration The calibration can be terminated in the following cases e complete calibration has been performed new calibration data have been entered the program has returned to the calibration menu e calibration of selected function has been performed new calibration data have been entered the program has returned to the calibration menu e calibration of selected range s of selected function has been performed new calibration data have been entered the program has returned to the calibration menu e the calibration has been started but no calibration data have been entered the program has returned to the calibration menu after EXIT display button has been pressed Press EXIT display button to terminate the calibration After the button is pressed the calibration date is saved internally and the calibrator returns to the state it was in before the calibration has been started Calibration points Each function of the calibrator has assigned fixed calibration points which have to be set during the calibration For VOLTAGE DC VOLTAGE AC CURRENT DC CURRENT AC the signal value is set using the keyboard T function does not require any calibration as the output voltage or resistance is based on arithmetic interpolation using standard tables of temperature sensor valu
55. sisisscvesdccevasssiveseocdssecasesvessecsssossesssnvaseonbssveasssSuacecuascopesessascesenedsnssscsbonsssoace 16 Generation of calibrated voltage Leere eee eee esee esee en esee ee nere serie eresse nec eeesieneseseeneceneeo 17 Generation of calibrated current eee ee eee eee ee esee ee seen setas tn nese nese ne senese nese ener ene neree sten seta setas 19 Simulation of temperature sensors crsssnnssnonsessnssssnnnsnsnnnsnnnnssnnnsnsnnnsnnnnssnnssssnnnsnsnnssnnnssnnssssnnnsnannne 20 Set p menis iaia 22 Calibration mode ria 26 EROS 33 Functional description of the calibrator e eee eee e eese eee ee ee eene e etnia setas 36 TITEL ITTH I TU RC 41 LA d ECT TP CT NIRE ETT ee HR 43 SYSTEM COBIYOL scalare 48 RS232 DUS properties EET CN LITT ILS 48 Command SYMCAX ERI I OE AA IT 48 Examples OF USC nica ta 54 Calibration of measurement instruments 4er esee esee eene tenetis etna tese tts etta stes stesse en nese necenenneo 54 Multimeters ars ome OD ted Oder laoree dcdit aid 54 Thertromieters iio edad EL isa Licia EHEN ai iaia 55 IS DOCH ICU ON Rl RTT 56 D KEL AIIN a T PM TENE UD NES HM E E PUDE TRES LR ETT 59 Operation Manual v33 3 MC140i Multifunction Calibrator Powertek 4 Operation Manual v33 Powertek MC140i Multifunction Calibrator Basic Information MC 1401 is a multifunction
56. the calibrator s output in the calibration points To adjust the calibrator s output in the calibration points press SELECT button and use lt gt V cursor buttons or potentiometer to adjust output voltage Confirm correctly set value by pressing WRITE display button If you want to skip the calibration point whose calibration you have already entered press SKIP display button Switch output terminals OFF AC voltage ranges calibration a b c d Select VOLTAGE AC from the calibration menu and confirm by pressing SELECT button Switch MC 140 output terminals ON Follow the instructions provided on the calibrator s display and the ACU table to adjust the calibrator s output in the calibration points To adjust the calibrator s output in the calibration points press SELECT button and use lt gt V cursor buttons or potentiometer to adjust the output voltage Confirm correctly set value by pressing WRITE display button If you want to skip the calibration point whose calibration you have already entered press SKIP display button Switch output terminals OFF Disconnect multimeter and calibrator Operation Manual v33 Powertek MC 140i Multifunction Calibrato 6 DC current ranges calibration a Connect current input terminals of the multimeter to the I I output terminals of the calibrator Select CURRENT DC from the calibration menu b Select DC current measurement range on external multimeter Switch
57. the rear panel Flat display is lit e The calibrator performs internal hardware checks for 5 seconds e After the tests conclude the calibrator resets to its reference state i e the following parameters are set Function DC voltage Range 20V Set value 10 V Output terminals OFF Note The calibrator resets to its reference status in case of power switching off and reconnection Warm up time The calibrator works after it is switched on and the initial checks complete Specified parameters are only guaranteed after the instrument warms up for 60 minutes During this period the instrument cannot be calibrated The display shows cannot access the calibration message if calibration is attempted during this period Replacement of fuse The calibrator includes a fuse located in the mains connector at the rear panel Replace the fuse as follows e Switch off the calibrator e Remove the end of power cord from the mains connector at the rear panel e Insert the blade of a flat screwdriver into the opening cut in the mains voltage selector and pull out the fuse holder e Remove the fuse and replace it with new fuse of the same rating 6 Operation Manual v33 Powertek MC 140i Multifunction Calibrator Safety precautions The instrument has been designed in Safety Class I according to EN 61010 1 The design reflects the requirements of A2 amendment of the standard Safety is ensured by the design and by the use of specific com
58. tivated by pressing T direct mode button The calibrator can be connected to transducer s input directly from Hi Lo terminals Temperature of cold junction must be compensated by manual setting of RJ value The connection is similar to voltmeter connection Operation Manual v33 55 MC 140i Multifunction Calibrator Powertek Specification Uncertainties include long term stability temperature coefficient linearity load and line regulation and the traceability of factory and National calibration standards Specified accuracy is valid after one hour warm up in temperature range 23 2 C Specified accuracy is one year accuracy Calibrator Voltage summary range DCV 0 uV 1000 V summary range ACV 0 1 mV 1000 V internal ranges 20 mV 200 mV 2 V 20 V 240 V 1000 V frequency range 20 Hz to 50 kHz bellow 20 V 20 Hz to 10 kHz bellow 200 V 20 Hz to 1000 Hz bellow 1000 V frequency resolution 6 digit frequency uncertainty 0 005 wave form sin 0 uV 20 00000 mV 0 03 0 0 10 uV 20 00001 mV 200 0000 mV 0 01 0 0 15 uV 0 200001 mV 2 000000 V 0 003 0 0008 2 00001 V 20 00000 V 0 003 0 0005 20 0001 V 240 0000 V 0 003 0 0005 240 001 V 1000 000 V 0 005 0 005 value of the range for uncertainty calculation is 200 V ACV uncertain value range max current mA value range max current mA 20 Hz 10 kHz 20 Hz 10 kHz 10 kHz 50 kHz 10 kHz 50 kHz 0 10000 mV 20 00000
59. to select OFF or Xon Xoff Perfect communication with the PC requires equal values set at the PC and the calibrator 13 Keyb beep xx ON OFF This parameter allows the acoustic indication of pressed buttons to be switched off or on ON and OFF display buttons can be used to switch the indication off or on ON is set by the manufacturer Operation Manual v33 23 MC 140i Multifunction Calibrator Powertek This parameter does not control the acoustic indication of output voltages over 100 V and identification of errors 14 Keyb volume xx UP DOWN This parameter allows the volume of acoustic indication to be set UP and DOWN display buttons allow to set the value in the range of 00 to 15 The bigger the value the louder sound This parameter controls the volume of keyboard beep if switched on indication of output voltages over 100 V and identification of errors when controlling the calibrator 15 Brightness xx UP DOWN This parameter sets the contrast of the display UP and DOWN display buttons allow to set the value in the range of 00 to 15 16 Rotary change xx N A Not available in MC 140i version 17 Switch polarity xx N A Not available in MC 140i version 18 Switch activity xx N A Not available in MC 140i version 19 Cal code 00000 Entry of calibration code Calibration code is a five digit number which must be entered to access the calibration mode If the calibration code
60. to the terminals Information field on the display shows the following symbol Press the OUTPUT button again to disconnect the output terminals Information field on the display shows the following symbol orr During mode change output terminals are always disconnected Output terminals are disconnected also when changing between voltage and current ranges or when changing between AC and DC ranges is performed If voltage over 100 V is set in the voltage mode special algorithm must be followed to connect the output terminals The algorithm is described in the Generation of calibrated voltage chapter of this Manual Setting the frequency Frequency can only be selected in AC voltage ACU mode AC current ACI mode Set value of frequency is included in the minor data section of the display Frequency change e First select the AC voltage or AC current mode by pressing U I AC buttons or selecting the P E mode using the display Frequency value f xxx xx Hz appears in the minor data section of the display f symbol is displayed above one of the display buttons e After f display button is pressed 1 symbols appear below the frequency value Numeric keyboard can be used to enter the desired value Press Hz or kHz to confirm the value The value can be set using the buttons or the potentiometer OUTPUT 18 18 2888 12 21 13 BHBHH 10 00000 U AX 3E BBBBz Ac
61. ty 3 0 0000 uA 200 0000 LA 0 05 0 0 20 nA 0 200001 LA 2 000000 mA 0 02 0 005 2 00001 mA 20 00000 mA 0 01 0 003 20 0001 mA 200 0000 mA 0 01 0 003 0 200001 mA 2 000000 A 0 015 0 005 2 00001 A 20 00000 A 0 02 0 010 3 3 3 3 ACI uncertainty value range max voltage Vef value range max voltage Vef 20 Hz 1 kHz 1 kHz 5 kHz 1 0000 uA 200 0000 uA 0 15 0 0 20 nA 0 30 0 10 20 nA 0 200000 uA 2 000000 mA 0 07 0 01 0 20 0 05 2 00000 mA 20 00000 mA 0 05 0 005 0 20 0 05 20 0000 mA 200 0000 mA 0 05 0 005 0 20 0 05 0 200000 mA 2 000000 A 0 05 0 005 2 00000 A 20 00000 A 0 10 0 03 5 kHz 10 kHz 1 0000 uA 200 0000 pA 5 0 200001 LA 2 000000 mA 0 50 0 07 2 00001 mA 20 00000 mA 0 50 0 07 20 0001 mA 200 0000 mA 0 50 0 07 0 200001 mA 2 000000 A 2 00001 A 20 00000 A When option 140 50 Current Coil is used add uncertainty 0 3 ofthe set current to the value specified in above table Output current is multiplied by factor 50 Auxiliary parameters maximal inductive load 400 uH 400 uH 400 uH 400 uH 200 uH 100 uH parameter includes non linear distortion and non harmonic noise Operation Manual v33 57 MC 140i Multifunction Calibrator Powertek Temperature sensors simulation temperature scale ITS 90 PTS 68 types of sensors TC type K N R S B J T E temperature range 250 to 1820 C accordi
62. used for calibration Specification of the calibrator is valid when recommended frequency is used Operation Manual v33 31 MC 140i Multifunction Calibrator Powertek Full calibration procedure Following pages describe procedure of the full calibration Required instruments Following instruments are required for calibration 81 2 digit multimeter type Agilent 3458A or Fluke 8508A or other type with accuracy 0 001 on DC voltage Resistance shunt 10 mQ 100 mQ Burster 1280 or other type with accuracy 0 01 Counter HP 53181A HO 53130 BM 642 or other with accuracy 0 001 HP8903A Distortion analyzer and scope with bandwidth min 20 MHz are recommended for THD measuring of AC signals Calibration procedure 1 32 Connect the calibrator and the multimeter to the mains and let them switched on for at least three hours in a laboratory at 23 1 C Press SETUP display button to call up the setup menu and then CALIB display button to call up the calibration menu Enter the calibration code and press ENTER default calibration code is 00000 DC voltage ranges calibration a b c d e Connect the voltage input terminals of the multimeter to the Hi Lo output terminals of the calibrator Select VOLTAGE DC from the calibration menu and confirm by pressing SELECT button Switch MC 140 output terminals ON Follow the instructions provided on the calibrator s display and the DCU table to adjust
63. ut value from the main data to be set using a separate display Relative deviation is displayed in the minor data section of the display and is designated with A 00 0000 symbol The relative deviation can be entered using one of the methods described above e g using the numeric keyboard cursor keys or the potentiometer Setting relative deviation using numeric keyboard e keep pressing the center cursor button until _______ deviation value in the minor data section of the display symbols appear under the relative e enter the desired deviation and confirm the value by pressing display button or by pressing ENTER on the numeric keyboard e the auxiliary line below the main data on the display displays the total value of output signal including the unit of measurement e the value of the signal at output terminals is the value indicated by the main display A 14 Operation Manual v33 Powertek MC 140i Multifunction Calibrator 18 18 2888 12 19 10 00000 U fae ee 1660 600 Hz Shape Sine Accuracy H 835Z Maximum relative deviation which can be entered is 30 000 95 The deviation can be positive or negative If negative deviation is desired press the display button labeled If positive deviation is then desired press button again The polarity of the relative deviation can be reversed using the cursor buttons or the potentiometer as well Setting relative deviation
64. uts of the calibrator GND U OFF GND I OFF to exclude ground loops Note 22 Operation Manual v33 Powertek MC 1401 Multifunction Calibrator If neither the calibrator s output nor the meter s inputs are grounded signal noise ratio can arise at the calibrator s output 4 Temp scale xx ITS90 PTS68 This parameter allows the temperature scale for platinum resistance temperature sensors to be selected Pressing the display buttons allows to switch between ITS90 and PTS68 temperature scales ITS90 is set by the manufacturer 5 Temp unit xx C K This parameter allows the temperature unit for simulation of temperature sensors to be selected Pressing the display buttons allows to switch between C and K C is set by the manufacturer 6 Phase unit xx N A Not available in MC 140i version 7 Output 140 41 xx N A Not available in MC 140i version 8 Meter average xx N A Not available in MC 140i version 9 Interface xx N A Not available in MC 140i version 10 GPIB address xx N A Not available in MC 140i version 11 RS232 baud rate xx UP DOWN Indicates the communication speed of RS232 bus UP DOWN display buttons can be used to select 150 300 600 1200 2400 4800 9600 19200 Perfect communication with the PC requires equal values set at the PC and the calibrator 12 Handshake xx OFF Xon Xoff Indicates the communication handshake Display buttons can be used
65. y button the following data are shown CALIBRATION MENU Ualtage IC Range 20m Ualue Bmlu 00327679 WRITE iP Exit Display buttons have the following meaning WRITE new calibration value is entered into the memory old value is irreversibly lost SKIP current calibration step is skipped old value is retained in the memory EXIT current calibration is terminated After this button is pressed the calibration memory hold all data old or new entered and the calibrator returns to the calibration menu It is not necessary to calibrate all ranges calibration of only selected ranges is possible by skipping the ranges which do not need to be calibrated Moreover the display shows the range which is being calibrated RANGE and the value to be set at the external standard multimeter VALUE 28 Operation Manual v33 Powertek MC 140i Multifunction Calibrato Setting the new calibration data Use A v lt gt cursor buttons to set such main data on the display when the output signal measured by external standard multimeter reaches the required calibration point When the standard output value is reached press WRITE to write new calibration value to the calibration memory If you press SKIP button the calibrator ignores the new value and old value is retained After you press WRITE or SKIP the calibrator moves on to the next calibration point The procedure is repeated for all calibration point

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