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1. Function Range Value V Frequency Max Hz deviation S of value V DC 10 0 V 23 0 0 008 V DC 10 0 V 4 0 0 006 V DC 10 0 V 6 0 0 005 V DC 10 0 V 8 0 0 004 V DC 10 0 V 10 0 0 004 V DC 10 0 V E20 0 008 V DC 10 0 V 4 0 0 006 V DC 10 0 V 6 0 0 005 V DC 10 0 V 8 0 0 004 V DC 10 0 V 10 0 0 004 Table I DC voltage ranges Function Range Value V Frequency Max Hz deviation S of value V DC 10 mV 5 m 0 004 V DC 10 mV 9m 0 004 V DC 10 mV 5 m 0 004 V DC 10 mV 9 m 0 004 V DC 00 mV 50 m 0 004 V DC 00 mV 90 m 0 004 V DC 00 mV 50 m 0 004 V DC LOO mV 90 m 0 004 V DC 1 0 V 0 5 0 004 V DC LQ 1 0 0 004 V DC L0 y 0 5 0 004 V DC 1 0 V 1 0 0 004 V DC 100 0 Vv 50 0 0 004 V DC 100 0 Vv 100 0 0 003 V DC TOO040 y 50 0 0 004 V DC 100 0 Vv 100 0 0 003 V DC 750 0 V 300 0 0 010 V DC 750 0 V 700 0 0 010 Table II Operation manual v22 39 Powertek Portable Multifunction CalibratorMC 141 20 V AC voltage basic range with linearity testing Function Range Value V Frequency Max Hz deviation of value V AC 10 0 V 210 100 02 075 V AC 10 0 V 4 0 100 0 050 V AC 10 0 W 6 0 100 0 042 V AC 10 0 V 8 0 100 0 037 V AC 10 0 V 10 0 100 0 035 Table III AC voltage ranges Function Range Value V Frequency Max Hz d
2. lt DNPD gt lt DNPD gt lt DNPD gt TIME lt DNPD gt lt DNPD gt lt DNPD gt SYST DATE lt DNPD gt lt DNPD gt lt DNPD gt This command sets system date of the calibrator lt DNPD gt lt DNPD gt lt DNPD gt Represents date in format YYYY MM DD If query is sent M141 returns current value of system date in format YYYY MM DD where YYYY year 2000 2099 MM month 01 12 DD day 01 31 SYST TIME lt DNPD gt lt DNPD gt lt DNPD gt This command sets time of the calibrator lt DNPD gt lt DNPD gt lt DNPD gt Represents time in format HH MM SS If query is sent M141 returns current value of system time in format HH MM SS where HH hour 00 23 MM minute 00 59 SS second 00 59 I D 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 141 412341 4 6 Operation complete OPC Operation manual v22 49 Powertek Portable Multifunction CalibratorMC 141 This command sets the OPC bit in the ESR Event Status Register when all pending operations are complete Operation complete OPC This command returns 1 to the output queue after all pending operations are complete Wait to Continue command WAI Prevents the instrument from executing any further commands or queries until all previous remote commands have been execut
3. 5 Perform linearity test on the range 100 mA DC tests of all other current ranges DC I and ranges AC I according to the tables V VI VII Measured deviation should not exceed the limits in tables 6 Set function for resistance measuring on the standard multimeter 4 wire connection Measure the fix resistances of resistance function of the calibrator according to the table VIII Measured deviation should not exceed the limits in tables 7 Set AC voltage output 1V frequency 1 kHz on the calibrator Connect standard counter to the output terminals Hi Lo 38 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek 8 Test output frequency of the calibrator according to the table IX Measured deviation should not exceed the limits in tables 9 Measure harmonic distortion of the signal on Hi Lo terminals Use the same setting on the calibrator as in previous step Measured deviation should not exceed value 0 05 New calibration adjusting should be performed if in any of previous steps deviation out of limits is found Partial calibration of the outlimit function range is usually enough Information about calibration procedure in more details are described in the chapter Calibration mode Verification test tables of limits 20 V DC basic voltage range with linearity testing
4. Read by Serial Pall Service Request STB Status Bye Register Generation ry Read using STB Read using SRE A Vifite using SRE 7 6 5 4 3 2 1 o SRE Serice Request Enable Register Status Register Overview SRE SRE ESR ESE ESE a CLS Status data structure of M140 Calibrator contains following registers STB Status Byte Register SRE Service Request Enable Register ESR Event Status Register ESE Event Status Enable Register Output Queue 52 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek STB Status Byte Register STB is main register where information from other status registers and from output queue is collected Value of STB register is reset after switching on the calibrator or after sending command CLS This command reset the STB register except bit MAV which remains set if the output queue is not empty STB register value can be read via serial message or through general query STB Bit configuration of Status Byte Register RQS Request Service bit 6 The bit is read as a part of status byte only when serial message is sent MSS Master Summary Status bit 6 The MSS bit is set to 1 whenever bits ESB or MAV are 1 and enabled 1 in the SRE This bit can be read using the STB command His value is derived from STB and SRE status ESB Event Summary Bit bit 5 His value is derived from STB and SRE status Th
5. 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 Table DCI 30 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek CURRENT AC Nominal value A Tolerance A Range A Frequency Hz Sn 50n 40n 200 n 200 n 2u 2u Table ACI To calibrate ACV function is possible also on another set frequency Specification in whole frequency range is guaranteed only when recommended frequency is used RESISTANCE Nominal value Q Tolerance Q Range 2 10 50 10 50 10 50 50 100 50 100 50 100 100 400 100 400 Table R Standard multimeter should be connected in four terminals way to the output terminals Hi Lo Operation manual v22 31 Powertek Portable Multifunction CalibratorMC 141 RTD TEMPERATURE SENSOR SIMULATION Nominal calibration point Tolerance 2 2 Table R In column Tolerance requested accuracy of measurement of the resistance segment is shown Standard multimeter has to be connected in four terminals way to the output terminals Hi Lo for values bellow 10 kOhm 32 Operation manual _v22 Portable Multifunction CalibratorMC141
6. Frequency Waveform Frequency range Frequency resolution Uncertainty General data Reference temperature range Warm up time Working temperatures Temperature coefficient Storing temperatures Pressure Power supply voltage Power consumption Dimensions 60 square with fix amplitude 5Vpk pk 50 Ohm 0 1 Hz to 2 MHz 5 4 digit 0 005 23 C 2 C for specified uncertainties In temperature range 23 C 5 uncertainties are 2 x higher 5 min 5 C 40 C Temperature coefficient for temperature outside of Tcal 4 C between 5 C to 40 C is 0 15 x C 10 to 55 C at relative humidity to 80 86000 to 106000 Pa 115 230V 50 60 Hz 40 VA max 325mm x 111mm x 316mm 2 Operation manual v22 Powertek Weight Interface Fuses Modifications MC 141 MC 141GPIB Portable Multifunction CalibratorMC 141 9 kg RS232 IEEE488 optionally Fuse T1L250 230 V T2L250 115 V basic model with RS 232 model with both RS 232 and GPIB interface Accessory included in basic delivery Power line cord Operation manual Test report Spare fuse Test cable Option RS 232 RTD Test cable Options extra ordered e Option 140 50 l pe l pe l pe l pe 2 pes Cable RS 232 l pe when option RTD simulator built in only Current coil 25 50 turns e Option 10 Test cable 20A 1000V red e Option 11 Test cable 20A 1000V black e Option GPIB Cable
7. Press ESC display button to terminate the calibration The calibrator returns to the state it was in before the calibration has been started Calibration points Each function contains fixed calibration points which have to be set during the calibration For VOLTAGE DC VOLTAGE AC CURRENT DC CURRENT AC the output signal value is set using the keyboard For RESISTANCE function calibration data of the fixed resistances must be entered T function does not require any calibration as the output voltage or resistance is based on arithmetic interpolation using standard tables of temperature sensor values VOLTAGE DC Nominal value V Tolerance V Range V 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 slope calibration slope calibration slope calibration slope calibration Table DCV Operation manual v22 29 Powertek Portable Multifunction CalibratorMC 141 VOLTAGE AC Nominal value V Tolerance V Frequency Hz Table ACV To calibrate ACV function is possible also on another set frequency Specification in whole frequency range is guaranteed only when recommended frequency is used CURRENT DC Nominal value A Tolerance A Range
8. 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 lt cr gt or lt lf gt 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 lt cr gt lt lf gt or lt crlf gt code Without this code the program line is ignored 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 Program Data Usually it represents a group of alternative character parameters E g ON OFF 0 1 lt SPD gt String Program Data String value consisting from more parts It is used for date time setting 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 A flag indicating a request for the parameter specified by the comm
9. been detected by the M141 EXE Execution Error bit 4 This event bit indicates that the received command cannot be executed owing to the device state or the command parameter being out of limits DDE Device Dependent Error bit 3 This event bit indicates that an error has occurred which is neither a Command Error a Query Error nor an Execution Error A Device specific Error is any executed device operation that did not properly complete due to some condition such as overload QYE Query Error bit 2 The bit is set if the calibrator is addressed as talker and output queue is empty or if control unit did not pick up response before sending next query Operation manual v22 53 Powertek Portable Multifunction CalibratorMC 1411 OPC Operation Complete bit 0 This event bit is generated in response to the OPC command It indicates that the device has completed all selected pending operations ESE Event Status Enable Register The Event Status Enable Register allows one or more events in the Event Status Register to be reflected in the ESB summary message bit This register is defined for 8 bits each corresponding to the bits in the Event Status Register The Event Status Enable Register is read with the common query ESE Data is returned as a binary weighted value The Event Status Enable Register is written to by the common command ESE Sending the ESE common command followed by a zero clears the ESE The Event Status Enable Regi
10. min and the load can then be connected again When feeding 0 2 to 2 A current to the output terminals the output voltage must not exceed approx 2 Vef If the current causes higher voltage on the load the calibrator disconnects the output terminals and displays an error message When ammeters are being calibrated using currents over 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 AC current It is not recommended to connect non standard load to the current output The calibrator is designed for use in 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 If L terminal of the instrument to be calibrated is not grounded the Lo terminal should be grounded GND ON see Setup menu chapter Connecting the ammeter to the current terminals 1 00000 A Eee Optional current coil can extend the calibrator s current range to 100 A The coil can be used for calibration of both DC and AC ammeters The clamps of the ammeter must be positione
11. 0 ungrounds the voltage output If query is sent M141 returns ON when the output is grounded or OFF when ungrounded Example 46 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Grounding of the voltage output terminal Lo EART VOLT 1 lt If gt SOUR FREQ 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 If gt AC current frequency FUNC SIN CURR lt DNPD gt FREQ lt DNPD gt lt If gt Digital frequency FUNC SQU FREQ lt DNPD gt lt lf gt lt DNPD gt It represents the frequency in Hz Technical Data chapter lists the acceptable ranges which depend on the selected function mode If query is sent M141 returns the set value of the current using standard exponential format Example 200 5Hz is returned as 2 005000e 002 SOUR TEMP UNIT lt CPD gt C CEL F FAR This command sets the unit of measurement of temperature e Cor CEL sets Centigrade e For FAR sets Kelvin The unit of measurement remains valid after the calibrator is switched off If query is sent M141 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 temp
12. GPIB IEEE488 IEEE488 2m e WinQbase CALIBER Application SW for automatic calibration of meters Powertek 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 Int l Tel 44 1788 519911 Int l Fax 44 870 0940135 Email info powertekuk com www powertekuk com Tel 1 631 615 6279 Fax 1 973 273 5893 Email info powertekus com www powertekus com Operation Manual 61
13. be present at the output terminals If the output terminals are currently connected they will be disconnected when output voltage over 100 V is selected ON OFF button must be pressed to reconnect the output signal to the output terminals After the ON OFF button is pressed an interrupted beep is sound OUTPUT LED is lit and the 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 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 A ATTENTION DANGEROUS VOLTAGE When the 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
14. calibrator for use primarily as a mean of calibration in calibration laboratories It can be used for calibration of any measuring instrument which measures voltage current resistance and frequency It generates harmonic and non harmonic signals with accurate amplitude The calibrator includes a function of simulation of thermocouple temperature sensors for testing of process meters Basic features of the calibrator includes generation of calibrated DC and AC voltage in the range from 0 uV to 750 V DC and AC current in the range from 0 uA to 2 A Maximum precision of the calibrator is 0 01 for DC voltage 0 055 for AC voltage 0 018 for DC current and 0 075 for AC current Maximum frequency range is 20 Hz to 1000 kHz The calibrator is also source of fixed decade resistance values in range from 10 Q to 100 MQ with accuracy 0 01 In frequency mode the calibrator can generate squarewave signal in range from 0 1 Hz to 2 MHz Simulation of temperature sensors is another feature that can be used to calibrate thermometers and heat sensing units The calibrator allows TC thermocouple temperature sensors of R S B J T E K N type 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 and is from 0 1 C to 4 3 C simulation RTD resistance temperature sensors of Pt Ni typ
15. grounded or floated 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 Between terminals following maximal voltages are allowed Hi GND protection terminal housing 1000VRMS I GND protection terminal housing 10VRMS Lo GND protection terminal housing 10VRMS I GND protection terminal housing 10VRMS 6 POWER button When the calibrator is switched off it can be switched on by pushing the button POWER When the calibrator is switched on it can be switched off be repeated pushing the same button After the first pushing request to switch the button POWER again is displayed When the button is switched the second time calibrator is switched off If any other button is switched instead of POWER calibrator is returned to the last set mode 7 Display 10 0000 V A 00 000 ACCURACY x10 10 0 0070 a b c d f e Operation manual v22 7 Powertek Portable Multifunction CalibratorMC 141 Display is graphically split into several fields which display information about calibrator setting a b d Information field It shows real time Real time displaying can be canceled in SERVICE MENU Main field On the line there is with double size numbers displayed main parameter of the calibrator output signal following with its unit With the symbols V A there is in
16. numbers are sent without sign Examples DC voltage 5V FUNC DC VOLT 5 lt If gt AC voltage 5V 100Hz FUNC SIN VOLT 5 FREQ 100 lt If gt SOUR CURR LEVE IMM 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 The command 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 M141 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 Examples DC current 18mA FUNC DC CURR 0 018 lt If gt AC current 18mA 100Hz FUNC SIN CURR 0 018 FREQ 100 lt If gt SOUR RES LEVE IMM AMPL lt DNPD gt This command activates the generation of a resistance lt DNPD gt The command represents the value of the resistance in Ohms Technical Data chapter lists the acceptable ranges If query is sent M141 returns the calibration value of resistance using standard exponential format Example 100 5Q is returned as 1 005000e 002 Example Resistance 1kQ setting RES 1000 lt If gt SOUR EART lt CPD gt 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
17. output terminals 0450 0 C a AT 000 0 C RJ 0000 0 C Type K ACCURACY Type 0 3 C Note Current capability in TC sensor simulation mode is 5 mA Operation manual v22 21 Powertek Portable Multifunction CalibratorMC 141 Switching between temperature sensor types Press the button TYPE Calibrator switches among thermocouples in order K N R S B J T E Currently set type of thermocouples is displayed in form TC TYPE x where x means type of thermocouple Cold junction temperature compensation RJ Temperature of cold junction can be compensated either manually or automatically If manual mode is selected temperature of cold junction is entered from front panel keyboard If automatic compensation is selected calibrator measure via internal Pt temperature meter the temperature of output terminals displays the measured value and compensate output voltage related to the set temperature with measured temperature of the terminals Switching between automatic and manual mode is one item in service MENU Manual compensation e By pushing the button MENU open servuci menu With cursor buttons v A select position RJ Temp and with display buttons select parameter FIXED e By repeated pushing the button FUNC select TC simulation function e Push the button SEL until symbol form RJ xxxx x C appears under the RJ value RJ value has e Write requested temperature of cold junction using numerical ke
18. ranges are labeled Hi and Lo at the front panel Depending on the setting of the calibrator voltage up to 750 Vef can be present at the terminals DC voltage range is from 0 to 750 V AC voltage range is from 100 uV to 750 V Output voltage up to 20 V is available at AUXILIARY connector pins 3 4 as well Control in the voltage mode Press FUNC button on the calibrator until DC or AC voltage mode will appears The display shows the following data main data of set voltage relative deviation uncertainty of output voltage frequency when AC voltage is generated Set the 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 ON OFF button Red LED is lit above the OUTPUT terminals to signal the connection of the signal to the output terminals the information section of the display shows the symbol ON e Calibrated voltage corresponding to set parameters is present at the output terminals 14 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Control 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
19. the display 24 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Contrast OFF Cal code 000000 Cal date 01 2003 Serial No XXXXXX Time fee ee ee 16 54 Calib The purpose of the calibration code is to prevent unauthorized users from changing the calibration of the instrument Note 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 15 Cal date XX YYYY Displays the date of last calibration of the calibrator month year The parameter cannot be changed as it is automatically recorded when leaving the calibration mode 16 Serial No XXXXXX Displays the serial number of the calibrator The parameter cannot be changed 17 Time xx yy Displays real time The parameter can be changed using HOUR MIN MIN display buttons 18 Date xxX yy 222Z Displays real time The parameter can be changed using DAY MONTH YEAR display buttons 19 Time on display xx ON OFF If the item is 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 v22 25 Powertek Portable Multifunction CalibratorMC 141 Calibration mode The multifunction calibrator is equipped with calibration procedure which allows re calibration of the cali
20. the range which is being calibrated RANGE and the value to be set at the external standard multimeter VALUE New calibration data setting Use v lt gt cursor buttons to set such main value 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 pressing the button WRITE or SKIP calibrator moves on to the next calibration point The procedure is repeated for all calibration points of the selected function If the button ESC is pressed before completing the calibration the calibrator returns to the basic calibration menu Termination of calibration The calibration can be closed in the following cases e complete calibration has been performed new calibration data have been saved the program is returned to the calibration menu 28 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek e calibration of selected function and selected ranges has been performed new calibration data have been saved the program is returned to the calibration menu e the calibration has been started but no calibration data have been entered the program is returned to the calibration menu after ESC display button has been pressed
21. the symbol ON 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 clamp ammeters to 100 A ammeters 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 v22 Portable Multifunction CalibratorMC141 Powertek Overloading the terminals When external circuit connected to current output terminals is disconnected or there is higher voltage at the load 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 ammeter connected Generation of non harmonic shapes The multifunction calibrator can generate non harmonic periodic signals with predefined shape To allow the setting of a non harmonic output shape the calibrator must be switched to ACV or ACI mode In both cases an indication of the type of output shape is displayed beside the main set value Press the display button SHAPE to change the shape of the output signal The calibrator can generate the following shapes e SINE si
22. 0 000 ACCURACY 0 0070 Operation manual v22 11 Powertek Portable Multifunction CalibratorMC 141 Maximum relative deviation which can be entered is 30 000 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 using cursor keys keep pressing the button SEL until symbols appear under the relative deviation value press lt gt A or v button The display now includes cursor marks which point to the active digit 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 to get to default mode press the button SEL until symbols are displayed under any item The same status can be achieved by pressing the button ESC If non zero deviation is entered also main value can be further changed Output signal is always recalculated from both these values Change of value by factor of ten All functions except TC simulation of the calibrator allow the increase of the output value by 10 or reduction of the output value by 10 If the change results in overflow or underflow of calibrator s range an error message appears Value too large if the resulting value is t
23. 05 10 uV 20 Hz 200 Hz 200 Hz 2000 Hz 10 000 mV 100 000 mV 0 01 0 001 10 uV 1 0000 mV 10 0000 mV 0 20 0 05 20 pV 0 20 0 10 20 uV 0 10000 mV 1 00000 V 0 008 0 002 10 000 mV 100 000 mV 0 10 0 03 20 uV 0 15 0 05 20 nV 1 0000 V 10 0000 V 0 008 0 002 0 10000 mV 1 00000 V 0 05 0 005 0 07 0 01 10 000 V 100 000 V 0 015 0 004 1 0000 V 10 0000 V 0 05 0 005 0 07 0 03 100 00 V 750 00 V 0 018 0 004 10 000 V 100 000 V 0 05 0 010 0 07 0 03 100 00 V 750 00 V_ 0 07 0 02 0 1 0 03 1 Voltage range 100 V from 40 Hz to 1000 Hz 2 Voltage range 750 V from 40 Hz to 1000 Hz Auxiliary parameters THD 0 05 200 uV Maximum output current 5 mA 5mA Output impedance lt 10 mQ lt 10 mQ Maximum capacitance load 500 pF 500 pF Amplitude accuracy in non 0 3 50 uV 0 3 50 uV harmonic mode peak value gt Parameter includes harmonic distortion and non harmonic noise in range to 1 MHz Current 58 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Current range totally 0uA 2 ADC luA 2AAC Ranges 200 uA 2 mA 20 mA 200 mA 2A Frequency range 20 Hz to 1 kHz accuracy of frequency 0 01 Frequency resolution 0 001 Hz Output wave form harmonic sinus non harmonic triangle symmetric triangle A B square limited sinus from 100 uA to 2 A frequency range 20 to 80 Hz DC current AC current Range of value of range Ra
24. M C es 1 41 Portable Multifunction Calibrator Operation manual Portable Multifunction CalibratorMC141 Powertek Content Operation manual Basic information Preparation for operation Content inspection Power line voltage setting Switch on Warm up time Fuse replacement Safety precautions Description of controls Front panel Rear panel Control of the calibrator Selection of function Output signal value Relative deviation Connection disconnection of output terminals Setting the frequency Generation of calibrated voltage Generation of calibrated current Generation of non harmonic shapes Resistance Generation of frequency Simulation of RTD temperature sensors Option RTD Simulation of TC temperature sensors Setup menu Calibration mode Error messages Calibrator s maintenance Verification test Interface IEEE 488 bus properties Operation manual ver 22 10 10 10 lI 12 13 14 16 17 18 19 19 21 23 26 35 36 37 42 42 Powertek Portable Multifunction CalibratorMC 14 RS232 serial line setting Command syntax Standard Status Data Structures Examples of use Calibration of measurement instruments Multimeters Counters and oscilloscopes Thermometers except sensor Specification 2 Operation manual 42 43 52 55 Portable Multifunction CalibratorMC141 Powertek Basic information MC 141 Multifunction Calibrator is a multifunction
25. Portable Multifunction CalibratorMC141 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 manufacturer If an obvious fault is evidenced e g a measurement range or an operating mode is not functional the user cannot repair the calibrator by himself Contact the manufacturer in this case 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 failure is caused with the operator Most frequent cases of false hidden defects e 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 can cause major instability during calibration using higher impedance Verification test Procedure recommended for verifying
26. Powertek Full calibration procedure Following pages describe procedure of the full calibration Required instruments Following instruments are required for calibration e 81 2 digit multimeter type HP3458A or Wavetek 1281 or Fluke 8508A or other type with accuracy 0 002 or better on DC voltage e Resistance shunt 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 Calibration procedure l Switch calibrator and standard multimeter on for at least three hours in laboratory at 23 1 C 2 Press MENU display button to call up the setup menu and then CALIB display button to call up the calibration menu 3 Enter the calibration code and press ENTER default calibration code is 000000 4 DC voltage ranges calibration a Connect the voltage input terminals of the multimeter to the Hi Lo calibrator output terminals b Select VOLTAGE DC from the calibration menu and confirm by pressing SEL button c Switch MC 141 output terminals ON d Follow the instructions provided on the calibrator display Refer to the DCV table in chapter Calibration points adjust the output level of the calibrator to meet nominal value displayed on the standard multimeter Use predefined calibration points e To adjust the output level in the calibration points use
27. R e If incorrect 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 will appear Voltage DC Voltage AC Current DC Current AC Resistance 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 5 RESISTANCE Resistance calibration Operation manual v22 27 Powertek Portable Multifunction CalibratorMC 141 Selection of calibration type After the calibration menu is displayed any 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 SEL display button Following data are shown the example bellow is valid for VOLTAGE DC range Voltage DC Range 10 mV The table lists calibration points Having selected the required calibration point using SEL display button following data are shown Voltage DC Range 10mV Range 10 mV Value 10mV 10146350 Display buttons have 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 Moreover the display shows
28. RTD simulation 2 Connection disconnection of output terminals After pressing the ON OFF button the output terminals of the calibrator are connected disconnected 3 Entry to the setup menu After pressing the SETUP button SETUP MENU appears on the display and the display buttons allow the entry to the calibration mode CALIB Previous mode is restored by pressing the ESC display button Output signal value All function modes allow several methods of setting the main value of the output signal Entry of the value using numeric keyboard use the numeric keyboard to select the desired value After the first digit is entered symbols of unit of measurements are displayed above the display buttons The monitor line displays the symbols 10 0000 V 11 2345 A 00 000 ACCURACY 0 0070 X10 10 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 the value is copied to the main display and the monitor line disappears 10 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Entry of the value using cursor buttons press lt gt or v button The display now includes cursor marks which point to the active digit A 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 to get to the de
29. Resistance Function Range Value Ohm Frequency Max Hz deviation of value O 4W 10 0 Ohm 10 0 DC 0 130 O 4W 100 0 Ohm 10 0 DC 0 130 O 4W 100 0 Ohm 100 0 DC 0 015 O 4W 1000 Ohm 1000 0 DC 0 015 O 4W 10k Ohm 10000 0000 DC Q 0415 O 4W 100k Ohm 100000 0000 DC 0 015 O 4W 1M Ohm 1 000000e 6 DC 0 050 O 4W 10M Ohm 1 000000e 7 DC 0 200 O 4W 100M Ohm 1 000000e 8 DC 0 500 Table VIII Frequency Function Range Value Hz Frequency Max Hz deviation 6 of value FREQ 1 MHz 1 000 000 0 005 Table IX Operation manual v22 41 Powertek Portable Multifunction CalibratorMC 141 Interface The calibrator is equipped with RS232 serial line as standard standardized IEEE 488 bus as option System connectors are located at the rear panel For the remote control to work properly interface parameters must be set in the system menu For RS232 line communication speed can be set 150 to 19200 Bd software handshake XON XOFF For IEEE 488 bus an address from range 0 to 30 is allowed The calibrator can be only controlled by one of interfaces at a time It is therefore necessary to select one of the interfaces GPIB RS232 using the system menu IEEE 488 bus properties The instrument performs the following functions based on GPIB bus commands SH1 AH1 T5 L3 RLI DCI SRI O The instrument also recognizes the following general commands pios DCL Device Clear reset the calibrator Boar SDC Selected Device Clear reset the calibra
30. alibrator from the damage caused by some improper connections e Do not damage the output terminals by plugging in bananas thicker than the terminals were designed for Whenever possible use the setup menu to ground Lo output terminal GND ON setup function Do not overload the power stages by leaving the calibrator switched on with the load connected for a long time especially on 2 A current range and1200V and 750 V voltage ranges e If the 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 750 V AC and the maximum output current can reach 2 A AC Regular maintenance The calibrator does not require any special maintenance of electrical or mechanical parts If it gets dirty the housing and the display may be cleaned by a wool rag moistened with alcohol Recommended re calibration period is 12 month intervals What to do in case of failure If an simple failure occurs during the operation e g the display is not lit switched off the calibrator Check the fuse located in the power socket on the rear panel Procedure is as follows 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 pry pull out the fuse holder 36 Operation manual _v22
31. alibrator is equipped with fix resistance positions values with decade nominal values The positions are created with stable resistors Their value cannot be adjusted The resistance feature is available on Hi Lo terminals in two wire connection Resistance range is 10 100 1k 10k 100k 1M 10M 100M Q Control in the resistance mode Press FUNC button until resistance function will appear The display shows the set resistance calibration value of set resistance in Q uncertainty of the resistance To change the resistance value press the display button x10 or 10 Press the button ON OFF to connect the resistance to the output terminals Red LED is lit above the ON OFF button and indicates that the resistance is connected to the output terminals 10 0059 KQ ACCURACY 0 015 Resistance mode is suitable for use in DC applications and AC applications to 10 kHz 18 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Generation of frequency Multifunction calibrator can generate squarewave TTL leveled signal with 4 digit resolution frequency The signal is available in frequency mode on output terminals Hi Lo Frequency range is from 0 1 Hz to 2 MHz Control in the frequency mode Press FUNC button until frequency mode is selected The display shows following data set frequency as main parameter relative deviation of frequency a uncertainty of frequency Set the frequency u
32. alogue voltmeters and millivoltmeters 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 as a source of precise voltage 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 be connected directly to the front panel terminals with test cables which are a part of basic delivery If L terminal of device under test is not grounded it is recommended to ground Lo terminal on the calibrator GND ON see chapter SETUP MENU Connecting the voltage input of the multimeter to the M141 voltage output Operation manual v22 55 Powertek Portable Multifunction Calibrator MC 141 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 example
33. and 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 I gt line feed ASCII code 10 This code executes the program line Operation manual v22 43 Powertek Portable Multifunction CalibratorMC 141 OUTPut subsyst m This subsystem enables to activate or deactivate the M14loutput and switch on off current coil function 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 output terminals e ON or activates the output e OFF or 0 deactivates the output If query is sent M141 returns ON if the output is active or OFF if it is inactive Example OUTP lt cr gt activates the output OUTP lt cr gt the calibrator returns ON or OFF OUTP ISEL lt CPD gt HIGH HI50 This command activates or deactivates the 100A current range using a 50 turn coil e HIGH deactivates the 50 turn coil e HI50 activates the 50 turn coil up to 100A range If query is sent M141 returns HIGH if the 50 turn coil is deactivated or HI50 if it is activated Example OUTP ISEL HI50 lt If gt activates the 50 turn coil OUTP ISEL lt If gt the calibrator returns HIGH or HI50 SOURce subsystem This subsystem allows to control the individual functions of M141 calibrator Ke
34. arity checking e DCYV voltage internal ranges 10 mV 100 mV 1 V 100 V 750 V test e 10 V AC voltage range test with linearity checking e AC V voltage internal ranges 10 mV 100 mV 1 V 100 V 750 V test e 200 mA DC current range test with linearity checking e DC Icurrent internal ranges 200 uA 2 mA 20 mA 2A test e AC Icurrent internal ranges 200 uA 2 mA 20 mA 200 mA 2A test e Resistance test in points 10 100 1k 10k 100k 1M 10M 100M Ohm e Frequency test at 1 kHz nominal value Verification procedure Following part describes procedure of performance verification test Recommended testing points are the same as the points in tables of allowed limits see tables bellow 1 Place the calibrator to the standard condition and let it switched on for at least one hour in a laboratory at 23 1 C 2 Connect voltage output of the calibrator Hi Lo to the input voltage terminals of the standard multimeter Set on the multimeter the parameters which enables the most accurate measurement 3 Perform linearity test on voltage range 10V tests of all other voltage ranges DC V linearity test on 10 VAC and tests on all other AC voltage ranges according to the tables I II II IV Measured deviation should not exceed the limits in tables 4 Connect current output of the calibrator I I to the input current terminals of the standard multimeter Set on the multimeter the parameters which enables the most accurate measurement
35. be disconnected or the mains switch must be switched off Operation manual v22 15 Powertek Portable Multifunction CalibratorMC 141 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 2 Aer can be driven by the terminals DC current range is 0 to2 A AC current range is lWA to 2 A When 50 turn coil option 140 50 is used maximal simulated AC current is 100 A Control in the current mode 16 Press the button FUNC until AC or DC current mode will appear The display shows the following data main data of set current relative deviation uncertainty of output current frequency when AC current is generated Set the desired value of current 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 Connect the load or short the output terminals labeled I I Press OUTPUT button Red LED is lit above the OUTPUT terminals to signal the connection of the signal to the output terminals the information section of the display shows
36. brator 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 front panel buttons and menu on the calibrator Calibration principles The calibrator can be calibrated e completely i e all functions are calibrated in all recommended points e partially i e only selected functions are calibrated in all recommended points e 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 interruption can be performed in any point of the calibration procedure However this particular calibration influences parameters of the calibrator Accuracy of the calibrator is guaranteed when full calibration was done calibration can be skipped 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 750 V range where zero correction is not necessary AC voltage calibration is performe
37. calibrator New calibration value confirm by pressing the button WRITE 9 RTD temperature sensor simulation a Select RTD temperature sensor function in calibration menu by pressing the button SEL b Set Resistance function on the standard multimetr select 4W method for values bellow 10kOhm Make short on the standard multimetr terminals to correct zero if necessary c Select partial resistance segments in the calibrator from 20 Ohm to 120 MOhm and measure them by standard multimeter Write measured values from the numerical keyboard to the calibrator New calibration value confirm by pressing the button WRITE 34 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Error messages If an error occurs in the calibrator during the operation or control error message is displayed on the display Errors can be caused by e incorrect control using the front panel i e attempts to set 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 the GPIB or RS 232 bus Following table lists all error messages their meaning and simple troubleshooting No Overload 1V 02 Overload 10V Overload I output Interface error Bad command Over range Communication error Check sum error Interrupted Unterm
38. d by setting the zero and slope of the scale in all ranges at 100 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 100 Hz Resistance calibration is based on writing and saving new calibration values of the fixed resistors RTD temperature sensor simulation calibration The procedure is based on measuring and saving into calibration memory of partial resistors in range from 20 Ohm to 120 MOhm Frequency function does not require any adjustment Also TC temperature sensor simulation function need no other adjustment as it is calculated from DC voltage ranges 10 and 100 mV Access to the calibration procedure Calibration code is required to access the calibration procedure e Press MENU button to open the setup menu 26 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek e Press CALIB display button e If an attempt is made to access the calibration procedure within 60 minutes after the calibrator was switched on the calibrator refuses to open the calibration menu and displays following message Err 21 Time warm up If the calibrator is already switched on for at least 60 minutes it requests calibration code Set Calibration code 000000 a ee er e Enter correct calibration code using numeric keyboard and press ENTE
39. d 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 56 Operation manual_v22 Portable Multifunction Calibrator MC141 Powertek ATTENTION The voltage between calibrator s I and Lo outputs must not exceed 10 V Counters and oscilloscopes The calibrator can be used for basic calibration of the frequency ranges of multimeters and simple counters The calibrator provides the following functions e calibration of frequency functions up to 2 MHz using squarewave signal The function is activated with repetitive pressing the FUNC button and selecting the Frequency mode Only value of frequency can be set e calibration of vertical sensitivity from 1 mV to 10 V in the frequency range 1 kHz ACV function is used with squarewave output form Frequency and amplitude can be set The instrument to be calibrated is connected to the Hi Lo output terminals Thermometers without sensor 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 activated by repeated pressin
40. dicated also active position of the cursor Cursor position can be set with cursor buttons lt gt set value with the buttons v Symbols of active cursor are displayed after pushing any of cursor buttons Auxiliary field In two lines auxiliary parameters of the output signal are displayed To these parameters belong Set relative deviation in Frequency of AC voltage current Temperature of cold junction in TC temperature sensor simulation mode type of TC sensor Display button field In the line labels related to the display buttons are shown Meaning is as follows Symbol Button function 10 x increasing the value for functions U I R F 10 x decreasing the value For functions U I R F Waveform selection U I functions Polarity of output signal For functions DC U DC I Enter to the calibration mode Available in MENU TC sensor type setting For temperature sensor simulation e Information field In the field some next information are displayed which are related to the set function e Symbol of OUTPUT ON or OUTPUT OFF output terminals In parallel LED diode is turning on off above the button ON OFF e Information about local remote control In remote control label REM is displayed in manual mode label LOCAL is shown e Information about output current simulated by current coil Opt 140 50 if the coil is connected to the output current terminals Access to this function is through SETUP MENU Information ab
41. display button or by pressing ENTER 20 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Simulation of TC temperature sensors When thermocouples are simulated the 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 FUNC button on the calibrator until TC sensor simulation will appear The display shows following data 7 main data of temperature in C or K sensor type thermocouples K N R S B J T E E cold junction temperature of thermocouple sensors RJ X set value of absolute deviation in labeled AT xxxx x C K the auxiliary section shows temperature scale type k 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 OFF which means that output terminals are disconnected Connect the object to be calibrated to Hi Lo terminals Press ON OFF button Red LED is lit above the OUTPUT terminal to indicate that the output signal is connected to the output terminals The display shows ON symbol of connected
42. e ESB bit is set to 1 when one or more enabled ESR bits are set to 1 MAV Message Available bit 4 The MAV bit is set to 1 whenever data is available in the M141 IEEE488 Output Queue the response on query is ready SRE Service Request Enable Register The Service Request Enable Register suppresses or allows the STB bits 0 value of a SRE bit means that the bit does not influence value of MSS bit Value of any unmask STB bit results in setting of the MSS bit to the level 1 SRE bit 6 is not influenced and its value is 0 The SRE register value can be set via the command SRE followed by mask register value 0 191 The register can be read with the command SRE The register is automatically resets after switching the calibrator on The register is not reset by the command CLS ESR Event Status Register Every bit of the EventStatusRegister corresponds to one event Bit is set when the event is changed and it remains set also when the event passed The ESR is cleared when the power is turned on except bit PON which is set and every time it is read via command ESR Or cleared with CLS Bit configuration of Event Status Register PON Power On bit 7 This event bit indicates that an off to on transition has occurred in the device s power supply URQ User Request bit 6 Bit is not used and it is always 0 CME Command Error bit 5 This event bit indicates that an incorrectly formed command or query has
43. e and 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 testing procedures etc The concept of the calibrator control and indication of its status is based on flat LCD display which provides all necessary information The calibrator is controlled by opening menus on the display and selection from menus Frequently used functions are assigned direct control keys The calibrator is delivered with standard RS 232 serial line as standard GPIB optionally which allows the calibrator to be controlled from a PC The calibrator can easily fit within calibration systems featuring MBASE WinQbase software support ATTENTION The calibrator generates life threatening high voltage The calibrator can only be used in line with this Manual Operation manual v22 3 Powertek Portable Multifunction CalibratorMC 141 Preparation for operation Content inspection Basic package includes the following items e Multifunction calibrator e Power cord e Spare fuse e Operation manual e Test report e Test cable 1000V 20 A 2 pes Power line voltage setting The calibrator should be powered from 230 115 V 50 60 Hz mains Its parameters are guaranteed at temperature range 23 5 C Before the first connecting the calibrator to the mains check the position of the mains voltage selector located at the rear
44. ed Reset RST This command resets the calibrator to its initial status Test operation TST This command launches an internal self test Return the self test result 0 for pass or 1 for fail Status byte reading TEEE488 only STB This query returns number in range 0 to 255 with information about content of register STB which carries the MSS bit status Service Request Enable reading IEEE488 only SRE lt value gt This command sets condition of the Service Request Enable register Since bit 6 is not used the maximum value is 191 Service Request Enable reading IEEE488 only SRE This query returns the Service Request Enable Register number Event Status Register reading IEEE488 only 50 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek ESR This query returns the contents of the Event Status Register and clears the register Event Status Enable setting IEEE488 only ESE lt value gt This command programs the Event Status Enable register bits Parameter value is number in range 0 255 Event Status Enable reading IEEE488 only ESE This query returns the Event Status Enable register Clear status IEEE488 only CLS This command clears the Event Status Register and the Status Byte Register except the MAV bit and output queue Output line is not reset Remote control REM This command activates the remote control When the calibrator is co
45. erature scale e TS90 sets ITS 90 temperature scale The temperature scale remains valid after the calibrator is switched off If query is sent M141 returns the set temperature scale TS68 TS90 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 If query is sent M141 returns the set type thermocouple B E J K N R S T Operation manual v22 47 Powertek Portable Multifunction CalibratorMC 141 Examples TC type K setting temperature 200 C ITS 90 temperature scale TEMP UNIT C TEMP SCAL TS90 TEMP THER TYPE K TEMP THER 200 lt lf gt SOUR TEMP THER RJUN RSEL lt CPD gt REAL SIM This command sets type of getting the cold end of thermocouple RJ temperature The RJ temperature can be either measured by internal thermometer or simulated e REAL sets measured RJ temperature e SIM sets simulated RJ temperature If query is sent M141 returns the set type of RJ temperature REAL SIM SOUR TEMP THER RJUN SIM lt DNPD gt This command sets the temperature of cold end of thermocouple RJ 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 SIM 25 lt lf gt If query is sent M141 returns the set temperature using standard exponential f
46. et 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 100 mOhm should be used on 2A range if standard multimeter does not cover this range with required accuracy f Switch output terminals OFF 7 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 display and the ACI table to adjust the calibrator output in the calibration points c To adjust the output level in the calibration points use lt gt v A cursor buttons Confirm 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 100 mOhm should be used on 2A range if standard multimeter does not cover this range with required accuracy e Switch output terminals OFF Disconnect multimeter and calibrator 8 Resistance ranges calibration a Select RESISTANCE function in calibration menu by pressing the button SEL b Set Resistance function on the standard multimetr select 4W method Make short on the standard multimetr terminals to correct zero if necessary c Select fixed resistance values on the calibrator from 10 Ohm to 100 MOhm and measure them by standard multimeter Write measured values from the numerical keyboard to the
47. eviation of value V AC 10 mV 0 010 1000 0 358 V AC 100 mv 0 100 1000 0 142 V AC 1 0 V 1 0 1000 0 030 V AC 10 0 V 10 0 50 0 030 V AC 10 0 V 10 0 300 0 030 V AC 100 0 V 100 0 1000 0 030 V AC 750 0 V 750 0 1000 0 036 Table IV 200 mA DC current basic range with linearity testing Function Range Value A Frequency Max Hz deviation 6 of value A DC 200 0 mA 0 04 0 025 A DC 200 0 mA 0 08 0 018 A DC 200 0 mA 0 12 0 015 A DC 200 0 mA 0 16 0 014 A DC 200 0 mA 0 18 0 013 A DC 200 0 mA 0 04 0 025 A DC 200 0 mA 0 08 0 018 A DC 200 0 mA O 12 0 015 A DC 200 0 mA 0 16 0 014 A DC 200 0 mA 0 18 0 013 Table V DC current ranges Function Range Value A Frequency Max Hz deviation 6 of value A DC 200 0 uA 0 00018 0 061 A DC 200 0 uA 0 00018 0 061 A DC 2 0 mA 0 0018 0 025 A DC 2 0 mA 0 0018 0 025 A DC 20 0 mA 0 018 0 013 A DC 20 0 mA 0 018 0 013 Table VI 40 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek AC current ranges Function Range Value A Frequency Max Hz deviation of value A AC 200 0 uA 0 00018 100 0 161 A AC 2 0 mA 0 0018 100 0 081 A AC 20 0 mA 0 018 100 0055 A AC 20 0 mA 0 018 300 0 055 A AC 20 0 mA 0 018 100 0 055 A AC 20 0 mA 0 018 100 0 055 A AC 200 0 mA 0 18 100 0 055 A AC 2 0 A 1 8 100 0 055 Table VII
48. f TC sensors compensation By pushing the display button FIXED or MEAS item can be chosen In FIX mode cold junction temperature must be entered manually from the keyboard In MEAS mode temperature of output terminals is measured by internal thermometer Output voltage related to the set temperature is corrected by the measured value 6 Interface xx GPIB RS232 Displays the type of interface used to control the calibrator from a PC By pressing GPIB or RS232 buttons the respective type can be selected The calibrator can be remotely controlled only using the selected interface GPIB interface is delivered as option only 7 GPIB address xx UP DOWN Displays the calibrator s address at the GPIB bus UP DOWN display buttons can be used to select any valid GBIP address in the range of 00 to 30 The address 02 is set by the manufacturer GPIB interface is delivered as option only 8 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 9 Handshake xx OFF Xon Xoff Indicates the communication handshake Display buttons can be used to select OFF or Xon Xoff Perfect communication with the PC requires equal values set at the PC and the calibrator 10 Keyb beep xx ON OFF This parameter allows the acoustic indicatio
49. fault screen press ESC 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 Relative deviation All function modes of the calibrator except frequency mode allow a relative deviation of output value from the main data to be set using a separate display Relative deviation is displayed in the auxiliary field section of the display and it is designated with A 00 0000 symbol The relative deviation can be entered using one of the methods described above Setting relative deviation using numeric keyboard keep pressing the center cursor button until symbols appear under the relative deviation value in the minor data section of the display enter the desired deviation and confirm the value by pressing display button or by pressing ENTER on the numeric keyboard the auxiliary line below the main data on the display displays the total value of output signal including the unit of measurement the value of the signal at output terminals is the value indicated by the main display A for voltage current frequency mode the value indicated by the main display A C for TC sensor simulation 10 0000 V A 0
50. g FUNC button until TC function is selected Temperature sensors type K N R S B J T E can be simulated Unit under test is connected to the Hi Lo output terminals Operation manual v22 57 Powertek Portable Multifunction CalibratorMC 141 Specification Bellow shown uncertainties are valid after specified warm up time in temperature range 23 2 C The uncertainties include long term stability temperature coefficient linearity load and line regulation and the traceability of factory and National calibration standards Specified uncertainties are valid for one year after the last calibration Specified uncertainties of range are related to the maximal value which cam be set on the range All uncertainties are calculated for coefficient probability 95 in normal distribution Technical data Voltage Voltage range totally 0 uV 750 V DC 1mV 750 V AC Ranges 100 mV 1 V 10 V 100 V 750 V Frequency range lImV 10V 20 Hz to 2 kHz 10 V 100 V 40 Hz to 2 kHz 100 V 750 V 40 Hz to 1 kHz Frequency resolution 0 001 Hz to 1 kHz 0 01 Hz to 2 kHz Accuracy of frequency 0 01 Output waveform harmonic sinus non harmonic triangle symmetrical triangle A B square limited sin with defined distortion k 13 45 from 1 mV to 10 V frequency range 20 to 80 Hz DC voltage AC voltage Range of value of range Range of value of range of value of range 0 0000 uV 10 0000 mv 0 05 0 0
51. inated Deadlocked Bad calib code Time warm up Value too large Value too small Deviation too large Unable Unable polarity Operation manual v22 Overloading of voltage output on range 1V Overloading of voltage output on range 10V 100V 750V Overloading of current output Remote connection error Unknown command GPIB RS 232 Overcrossed range in remote control mode Communication error on GPIB RS 232 Fail data loading into internal memory Interrupted command TEEE488 2 Wrong syntax IEEE488 2 Wrong syntax IEEE488 2 Wrong calibration code Attempt to start calibration before warm up 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 Output current is too high Increase load resistance Output current is too high Increase load resistance Voltage across external load is too high Decrease load resistance Enter correct data format on GPIB RS 232 Use only defined commands In remote control mode value out of allowed limits was send to the calibrator Enter correct value General communication error in remote control mode For service purpose only Enter full data format Enter correct data format Enter correct data format Wrong calibration code was entered calibration cannot start Enter correct calibration code Attempt to start calibration bef
52. ld of the display in ACV ACI modes Frequency change First select the AC voltage or AC current mode by repetitive pressing the button FUNC Frequency value f xxx xx Hz appears in the Auxiliary field of the display Press the button SEL until symbols appear under the frequency value Numeric keyboard can be used to enter the desired value Press Hz or kHz to confirm the value 10 0000 V A 00 000 ACCURACY Hz kHz SHAPE 0 0070 If too large or too small value is entered the calibrator displays the maximum minimum value which is allowed for the selected function Frequency F Set value of frequency is the main data on the display and the main parameter of the signal Main data can be set by direct entry using the numeric keyboard potentiometer or by changing the digit at the current cursor position The setting procedure is described in the Setting the value of output signal Operation manual v22 13 Powertek Portable Multifunction CalibratorMC 141 10 0000 kHz A 00 000 ACCURACY x101 10 0 0050 If frequency larger or smaller than the calibrator s range is entered the calibrator displays an error message Value is too large small Output waveform in frequency mode is always squarewave with TTL amplitude 0 5 V Generation of calibrated voltage The multifunction calibrator provides calibrated DC and AC voltage Output terminals for voltage
53. le Multifunction Calibrator MC141 Powertek Ranges and accuracy of the thermocouple sensor simulation Type R S B J T E K N Temperature scale ITS90 IPTS68 a Se 50 0 0 1 0 0 399 9 400 0 999 9 1000 0 1767 0 E a a E a 50 0 0 1 0 0 249 9 250 0 1399 9 1400 0 1767 0 ea a y a f e o el mer 400 0 799 9 800 0 999 9 1000 0 1499 9 1500 0 1820 0 E e a E a 210 0 100 1 100 0 149 9 150 0 699 9 700 0 1200 0 D a a a a 200 0 100 1 100 0 0 1 0 0 99 9 100 0 400 0 C eoa 250 0 100 1 100 0 279 9 280 0 599 9 600 0 1000 0 O ea a S e s e S 200 0 100 1 100 0 479 9 480 0 999 9 1000 0 1372 0 P memory os ees 200 0 100 1 100 0 0 1 0 0 579 9 580 0 1300 0 B ss Pts os 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 When automatic compensation of cold junction temperature via external Pt1000 sensor is used summary uncertainty of simulated temperature is higher due to limited accuracy of measuring ambient temperature with the external sensor This additional uncertainty is 0 2 C in temperature range from 15 to 35 C
54. led on the display They are used usually to enter into MENU changing the ranges recording values etc 2 Cursor buttons With the cursor buttons active position of the cursor and numerical value as well can be set The keyboard contains two buttons for setting of vertical position of the cursor lt gt The position can be step left or right Their are mostly used for moving in MENU jumping between two menus of different level or setting 6 Operation manual_v22 Portable Multifunction CalibratorMC141 Powertek active position in numerical value With the rest two buttons A v value can be incremented or decremented 3 Numerical keyboard Numerical values can be entered from the keyboard For confirmation of set value ENTER button is intended With CANCEL button already set value can be cancelled 4 Output terminal button With ON OFF button signal can be connected to the output terminals Switching on the output terminals is indicated with red LED diode in parallel with symbol ON or OFF displaying on the display 5 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 resistance frequency are connected to Hi Lo terminals GND terminal is located on the rear panel It is connected to the protective terminal of the mains plug Using the SETUP MENU item GND the output terminals of the calibrator can be set as
55. lt gt v A cursor buttons Confirm 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 f Switch output terminals OFF 5 AC voltage ranges calibration a Select VOLTAGE AC from the calibration menu and confirm by pressing SEL button b Switch MC 141 output terminals ON c Follow the instructions provided on the display and the ACV table to adjust the calibrator output in the calibration points d To adjust the output level in the calibration points use lt gt v A cursor buttons Confirm 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 Switch output terminals OFF Disconnect multimeter and calibrator Operation manual v22 33 Powertek Portable Multifunction CalibratorMC 141 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 the standard multimeter by pressing the button SEL Switch output terminals ON c Follow the instructions provided on the display and the DCI table to adjust the calibrator output in the calibration points d To adjust the output level in the calibration points use lt gt v A cursor buttons Confirm s
56. n 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 This parameter does not control the acoustic indication of output voltages over 100 V and identification of errors 11 Beep volume xx HIGH LOW This parameter allows the volume of acoustic indication to be set in two loudness 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 12 Display xx UP DOWN This parameter sets the uderlightning of the display Positions always OFF OFF 30s after last pushing a button OFF 300s after the last pushing a button permanently ON is offered 13 Contrast XX UP DOWN Setting the contrast of the display BY pushing the display button higher or low contrast can be set in range 00 to 31 14 Cal code 000000 Access to the calibration code Calibration code is a five digit number which must be entered to access the calibration mode If the calibration code is set to 000000 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
57. nge of value of range of value of range 0 000 uA 200 000 LA 0 05 0 0 20 nA 20 Hz 200 Hz 200 Hz 1000 Hz 0 20000 mA 2 00000 mA 0 025 0 005 1 000 uA 200 000 LA 0 25 0 0 20 nA 0 30 0 10 20 nA 2 0000 mA 22 0000 mA 0 015 0 003 0 20000 mA 2 00000 mA 0 10 0 01 0 20 0 05 22 000 mA 200 000 mA 0 015 0 003 2 0000 mA 22 0000 mA 0 07 0 005 0 20 0 05 0 20000 mA 2 0000A 0 015 0 005 22 000 mA 200 000 mA 0 07 0 005 0 20 0 05 0 20000 mA 2 0000A 0 1 0 005 0 25 0 05 Maximum inductive load Maximum voltage on the load pk 2 VAC 7 VDC THD 0 2 Amplitude accuracy in non 0 3 1uA 0 3 1 uA 0 3 harmonic mode peak value 4 Parameter includes harmonic distortion and non harmonic noise in range to 1 MHz Resistance Range totally 10 Q to 100 MQ in fix decade values Maximum voltage dissipation power 50 Vef 0 1 W Range Calibration uncertainty Tolerance 10 0000 Q 0 03 10 mQ 0 2 100mQ 100 000 Q 0 05 0 2 100mQ 1 00000 kQ 0 02 0 2 10 0000 kQ 0 02 0 2 100 000 kQ 0 02 0 2 1 00000 MQ 0 05 0 2 10 0000 MQ 0 05 1 100 000 MQ 0 5 2 RTD temperature sensor simulation option Type Pt 100 1000 Ni 100 1000 Temperature scale ITS90 IPTS68 Temperature standard IEC 1 385 US 1 391 Accuracy Pt100 Pt200 P1201 Pt1000 Ni100 Ni200 Ni201 Ni1000 60 0 0 0 C 0 1 300 0 C Operation manual 59 Portab
58. ntrolled by GPIB bus it goes to the remote control mode automatically When remote control is active the calibrator ignores all controls from the front panel except LOCAL button Local control LOC This command activates the local control using front panel buttons When the calibrator is controlled by GPIB bus it goes to the local control mode automatically Local control lock LLO 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 Operation manual v22 51 Powertek Portable Multifunction CalibratorMC 141 This command cancels the LLO command Unlocked calibrator can be returned to local control mode by pressing LOCAL button Standard Status Data Structures Calibrator meets standard protocol according to the standard IEEE488 2 The protocol can be used for checking of error and status behavior of the calibrator It enables single wire transmitting of SRQ command The conditions on which SRQ signal local control request is sent can be set with parameters STB Pron ur OME XE ooe ave 0 OPO ESR Event Status Register Read using ESR d 1 Output Queue Y Read using E SE A Wite using ESR y 7 6 5 4 3 2 1 o ESE Event Status Enable Register
59. nus harmonic e PWM SYM squarewave symmetrical with adjustable duty cycle e RAMPA ramp symmetrical positive e RAMPB ramp symmetrical negative e TRIANGLE triangular symmetrical e LIMSINE sinus with amplitude limitation truncated sin with defined distortion k 13 45 Generation of non harmonic signals has some limitations e non harmonic signals can be generated in frequency range 20 Hz to 80 Hz e maximal non harmonic current is 2A maximal voltage is 10V Control in the non harmonic mode Select AC voltage or AC current mode The main section of the display shows the following data main data of set current or voltage unit of measurement relative deviation frequency selected SHAPE of the output signal x y e Keep pressed SHAPE display button to select the desired shape of the output signal The output terminals are automatically disconnected when the shape of the output signal is changed Relative deviation is reset Displayed information When non harmonic output shape is selected the display shows additional information Operation manual v22 17 Powertek Portable Multifunction CalibratorMC 141 e Besides the main amplitude data pk index is displayed notifying that the displayed main value is the peak value e Symbol which displays the shape of the output signal is displayed 10 0000 Vpk A A 00 000 f 80 000 Hz ACCURACY x10 10 Shape 0 30 Resistance Multifunction c
60. olute deviation in labeled AT xxxx x C K the auxiliary 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 The information section of the display shows the symbol OFF which means that output terminals are disconnected Connect the object to be calibrated to RTD connector Press ON OFF button Red LED is lit above the OUTPUT terminal to indicate that the output signal is connected to the output terminals The display shows ON symbol of connected output terminals 0250 0 C AT 000 0 C RO 100 0 Ohm Pi385 ACCURACY Type 0 3 C Note Maximal power dissipation in the simulator is 0 2 W Switching between temperature sensor types Press Display button Type Each press of the button selects Pt1 385 Pt1 392 or Ni resistance thermometer The display shows current setting as Pt385 Pt392 Ni Entry of RO coefficient for resistance temperature sensors For resistance temperature sensors resistance at 0 C labeled RO can be set The range is 100 Q to 1 kQ for all types of resistance temperature sensors e Select the resistance temperature sensor mode and keep pressing the center cursor button until _ symbols appear under the RO coefficient value RO xxxx Q e Set the value using numeric keyboard and confirm by pressing Q
61. oo large Value too small if the resulting value is too small Range change Press the display button labeled x10 if you want to increase the range 10 to decrease the range The main value shown on the display is increased 10x reduced 10x In resistance function appropriate fix values are connected to the output terminals Connection disconnection of output terminals After switching on the output terminals are disconnected in all modes Press the ON OFF button to connect the output signal to the terminals Red LED above the OUTPUT button is lit and the information field on the display shows the symbol ON Press the ON OFF button again to disconnect the output terminals Red LED goes off and the information field on the display shows the symbol OF 12 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek 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 Voltage over 100 V is indicated also with acoustic interrupted signal Setting the frequency Frequency can only be selected in AC voltage mode AC current mode and frequency mode In each mode the frequency has a slightly different meaning and the frequency is therefore set in a different manner AC voltage ACU AC current ACI Set value of frequency is shown in the Auxiliary fie
62. ore 60 minutes warm up period Let the calibrator turned on for at least 60 minutes Maximum value is out of limit 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 For functions ACV ACI only Attempt to set negative polarity where it is not allowed For functions ACV ACI only 35 Powertek Portable Multifunction CalibratorMC 141 Calibrator s maintenance MC 141 Multifunction calibrator is electronic instrument which does not require any special kind of maintenance It is equipped with electronic protection circuits which protect the instrument against overloading Rules for correct operation Especially the following rules should be adhered to guarantee correct operation of the calibrator The calibrator may be switched on and off only by pressing the POWER button located on the front panel Do not connect the calibrator to other voltage than set by the voltage selector Do not block the vent openings located at the rear panel and bottom panel The calibrator must not be operated in dusty environment e No liquid or small objects can be permitted to enter the calibrator through the vent openings Do not switch the calibrator outside its operating temperature range Connect the instruments to be calibrated to proper output terminals There is no way of protecting the c
63. ormat Example 20 5 C is returned as 2 050000e 001 SOUR TEMP PRT LEVE IMM AMPL lt DNPD gt This command activates the simulation of resistance temperature sensors resistance generation 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 PRT TYPE lt CPD gt PT385 PT392 NI This command sets the type of resistance temperature sensor to be simulated Example to activate the simulation of platinum resistance temperature sensor at 350 C approximated using PT385 table Europe TEMP PRT 350 TEMP PRT TYPE PT385 lt cr gt If query is sent M141 returns the set type of approximation table PT385 PT392 NI SOUR TEMP PRT NRESistance lt DNPD gt This command sets the nominal resistance of the resistance temperature sensor at 0 C 100Q to 1kQ can be set 48 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek lt DNPD gt Represents the nominal resistance in Ohms If query is sent M141 returns the set value of nominal resistance using standard exponential format Example 100Q is returned as 1 000000e 002 SYSTem subsystem The subsystem enables to control various functions from the MENU SYSTem DATE
64. out grounding of Lo I terminals e Information about selected TC temperature sensor in mode TC sensor simulation f Uncertainty fiend In the field there is displayed currently valid uncertainty of the main parameter of the output signal It is calculated from full specification of the calibrator and it is displayed in 8 Operation manual_v22 Portable Multifunction CalibratorMC141 Powertek Rear panel On the rear panel there are located power line socket with fuse and power line voltage selector RS 232 connector GPIB optionally external temperature sensor connector and model plate number with serial number External temperature sensor connector RTD connector RTD option only Model plate RS 232 connector GPIB connector Power optionally Power line line selector socket GND terminal Operation manual v22 9 Powertek Portable Multifunction CalibratorMC 141 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 L Change of function By repeated pushing the button FUNC basic mode of the calibrator can be changed in the order DCV ACV DCI ACI resistance frequency TC simulation
65. panel If the set voltage differs from your power line voltage power line selector must be switched over Insert flat end of a screwdriver to the slot in power line socket on the rear panel Wind with the screwdriver slightly to pull out the holder with fuse and selector contacts Place the contacts in such position that correct power line voltage can be read in the rear window Push the holder back to the power line socket In the window correct voltage 115 or 230 V must be seen Switch on 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 Switch on the mains switch located at the rear panel Front panel display is lit MC 141 Portable Multifunction Calibrator The calibrator performs internal hardware checks for 5 seconds 4 Operation manual_v22 Portable Multifunction CalibratorMC141 Powertek After the tests conclude the calibrator resets to its reference state i e the following parameters are set Function DC voltage Range 10 V Set value 10 V Output terminals OFF Note The calibrator resets to its reference status in case of power switching off and switching on Warm up time The calibrator works after it is switched on and the initial checks complete Specified parameters are guaranteed after the instrument warms up for 5 minutes During this period the instrument cannot be re calibrated The display show
66. parameters of the calibrator is described in this chapter Required equipment Following instruments are required for performance verification test e 81 2 digit multimeter type HP3458A or Wavetek 1281 or other type with accuracy 0 001 on DC voltage e resistance shunt 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 can be tested directly from the front panel terminals 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 Coil x50 OFF e GNDU ON Operation manual v22 37 Powertek Portable Multifunction CalibratorMC 141 Note If it is grounded neither calibrator nor standard meter higher level can occur on the output terminals Setting of the other parameters do not influence accuracy of the calibrator Accuracy of AC voltage and AC current is defined for sinusoidal output signal Verification test should be provided after placing the calibrator to the temperature stabilized condition for at minimum 4 hours before verification test is started Basic steps of the performance verification test Verification procedure consists of following steps e 10 V DC voltage range test with line
67. r is switched off and switched on Setup menu offers 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 as default 2 GND xx ON OFF This parameter connects Lo terminal the groud terminal housing In practice this means that Lo terminal is grounded By pressing the display buttons the terminal can be grounded or ungrounded ON is set as default It is recommended to set the parameter to ON If the calibrated UUT has Lo terminal grounded it is better to unground the outputs of the calibrator GND OFF to exclude ground loops Note If neither the calibrator s output nor the meter s inputs are grounded signal noise ratio can arise at the calibrator s output 3 Temp scale xx ITS90 PTS68 This parameter allows the temperature scale for temperature sensors to be selected Pressing the display buttons allows to switch between ITS90 and PTS68 temperature scales ITS90 is set by the manufacturer 4 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 5 RJTemp XX FIXED MEAS Operation manual v22 23 Powertek Portable Multifunction CalibratorMC 141 Setting of method of cold junction temperature o
68. s cannot access the calibration message if calibration is attempted during this period Fuse replacement The calibrator includes a fuse located in the mains connector at the rear panel Replace the fuse as follows e Switch off the calibrator Remove the end of power cord from the mains connector at the rear panel Insert the blade of a flat screwdriver into the opening cut in the mains voltage selector and pull out the fuse holder Remove the fuse and replace it with new fuse of the same rating 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 component types The manufacturer is not responsible for a damage caused by modification of the construction or replacement of parts with non original ones Used safety symbols used on the instrument Warning reference to the documentation Warning risk of electric shock Operation manual v22 5 Powertek Portable Multifunction Calibrator MC 141 b Danger high voltage Description of controls Front panel The front panel of the calibrator includes a flat LCD display control buttons and output terminals Control parts are shown on the picture bellow Se SEE EIT LS 1 Display buttons Three buttons located under the display has alternative meaning Their actually valid function is labe
69. sing numeric keyboard cursor buttons or potentiometer Output signal is not yet connected to the output terminals Connect the object to be calibrated to FREQ terminal Press ON OFF button Red LED is lit above the OUTPUT terminals to indicate the connection of signal to the output connector 10 0000 kHz A 00 000 ACCURACY 0 0050 Note Output impedance in frequency mode is 50 Ohm on Hi Lo terminals Simulation of RTD temperature sensors Option RTD Multifunction calibrator can simulate optionally resistance RTD temperature sensors When resistance temperature sensors are simulated appropriate resistance with value corresponding to set temperature is connected to the output terminals on rear panel connector RTD Connection is four wire type Use connector attached to the delivery to connect unit under test to RTD connector Temperature setting range 250 to 850 C for Pt temperature sensors 60 to 300 C for Ni temperature sensors Temperature scale ITS 90 PTS 68 Rear panel RTD connector connection Pin 1 Li Pin 2 Lu Pin 3 Hi Pin 6 Hu Operation manual v22 19 Powertek Portable Multifunction CalibratorMC 141 Setting the temperature Press FUNC button on the calibrator until RTD sensor simulation function will appear The display shows following data main data of temperature in C or K sensor type thermocouples Pt or Ni with nominal value in 100 C i set value of abs
70. ster is cleared upon power on It suppresses or allows bits in ESR register Value 0 of a bit of ESE register suppresses influence of appropriate bit of ESR register on value of sum bit of ESB status register Setting of any unmask bit of ESR register results in setting of ESB status register ESE register value can be modified by command ESE followed by value of mask register integer in range 0 255 Reading of the register can be performed with command ESE The register is automatically reset after switching on The register is not reset with CLS command Output Queue The Output Queue stores response messages until they are read from control unit If there is at minimum one sign in the output queue MAV register message available is set The Output Queue is cleared upon power on and after reading all signs from output queue 54 Operation manual _v22 Portable Multifunction CalibratorMC 141 Powertek Examples of use Calibration of measurement instruments The calibrator can be used for direct calibration of various instruments which measure electrical values Thanks its low weight and small dimensions it is suitable also for field applications Multimeters The calibrator can be used for calibration of digital and analogue multimeters DCV ACV DCI ACI resistance temperature sensors frequency Voltage ranges Thanks to low output impedance and high output current the calibrator can be used for calibration of an
71. tor eno w nwo EOL End or Identify Message Terminator close the message cnocwearwinnac GTL Go To Local close remote control mode END PAR Wie LLO Local Lock Out local control locked pee NA SPD Serial Poll Disable close serial message status SPE Serial Poll Enable release serial message status wy RS232 serial line setting To transfer the data using RS232 bus 8N1 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 Name Direction Description 2 TXD Output Transmitter aqaoa A 3 3 RXD Input Receiver 5 GND Ground 9 pin connector D SUB FEMALE 42 Operation manual v22 Portable Multifunction CalibratorMC141 Powertek Cable between the calibrator and PC configuration 1 1 PC D Sub 1 D Sub 2 MC 141 Receiver 2 2 Transmitter Transmitter 3 3 Receiver Ground 5 5 Ground 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
72. utput signal ramp shape A for voltage or current modes The amplitude can be set tamplitude RMPB sets AC output signal ramp shape B for voltage or current modes The amplitude can be set The output switches between amplitude a 4 TRIangel sets AC output signal triangular tamplitude shape for voltage or current modes The amplitude can be set The output switches between amplitude a t amplitude LIMSinusoid sets AC output signal sinus shape with limitation of amplitude for voltage or current modes The amplitude can be set The output switches between amplitude a t amplitude SQUare sets digital frequency output If query is sent M141 returns a string containing DC SIN RMPA RMPB TRI LIMS SQU depending on the current setting If resistance or temperature sensor simulation is set NONE is returned 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 Operation manual v22 45 Powertek Portable Multifunction CalibratorMC 141 lt DNPD gt The command 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 M141 returns the set value of current using standard exponential format Example 20 547mV is returned as 2 054700e 002 Positive
73. yboard Confirm the value by pushing the button C K 0450 0 C A 00 000 RJ 0023 0 C To hype K ACCURACY O C 0 3 C Automatic compensation e Pushing the button MENU open service menu With cursor buttons v A select function RJ Temp and with display buttons select parameter MEAS e By repeated pushing the button FUNC select TC simulation function Temperature of the output terminals is displayed in the field RJ Output voltage is compensated with measured value Note As sensor for measuring of ambient temperature external Pt1000 sensor is used This sensor is part of standard delivery Sensor has to be connected to the connector on rear panel 22 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek Setup menu Multifunction calibrator allows other less frequently used parameters to be set Setup menu is used to set these parameters Setup menu is opened by pressing MENU display button If output terminals are connected they are disconnected and the following display appears Coil x50 Gnd Temp scale Temp unit RJ Temp Calib Use A or v cursor button 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 parameter can be set Press ESC button twice to save the parameters when new setting is completed New setting is saved and refreshed when the calibrato
74. yword Parameters SOURce FUNCtion SHAPe lt CPD gt DC SINusoid RMPA RMPB TRIangle LIMS SQUare VOLTage LEVE IMMediate AMPLitude lt DNPD gt CURRent LEVE IMMediate AMPLitude lt DNPD gt RESistance LEVE 44 Operation manual _v22 Portable Multifunction CalibratorMC141 Powertek IMMediate AMPLitude EARTh FREQuency ECW TEMPerature UNITs SCALe THERmocouple LEVE IMMediate AMPLitude TYPE RJUN RSELect SIMulated PRT LEVEI IMMediate AMPLitude TYPE NRESistance SOUR FUNC SHAP lt CPD gt This command sets the shape of the output signal At the same time the respective function must be set E g NC SIN or other signal shape must be set Some functions for VOLT or CURR function FUNC DC FU RES do not require any other settings e e SINusoid sets AC output signal for voltage The output switches between amplitude a 4 lt DNPD gt lt CPD gt ON OFF 0 1 lt DNPD gt lt CPD gt C CEL F FAR lt CPD gt TS68 TS90 lt DNPD gt lt CPD gt B E J K N R S T lt CPD gt REAL SIMulated lt DNPD gt lt DNPD gt lt CPD gt PT385 PT392 NI lt DNPD gt DC SIN RMPA RMPB TRI LIMS SQU DC sets a DC output signal for voltage current or power modes current or power modes RMPA sets AC o

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