Precision Resistance Decade OCM-622
Contents
1. Calibration mode password setting The calibration password is a five digit number which must be entered to access the calibration mode The factory setting is 00000 It is recommended to change the password and note it Without the password the calibration can not be performed The Password can be changed and the new password can be entered directly from keyboard Enter 00000 and the new password Confirm with ENTER Serial number The serial number of the instrument is entered during the production and can not be alternate 12 6 6 Calibration Mode The precision resistors of the decade can be recalibrated The access to the calibration mode is permitted after double pressing of the key MENU from the standard mode or after single pressing from the SETUP mode The correct password must be entered before calibration Without correct password the access to the calibration mode is refused Default factory set calibration code is 00000 Return to standard mode with the key ESC Enter PassWord HERE Recalibration procedure contains precision measurements of 36 basic resistors and entering their new values into the memory The keys 7 4 can be used for the settings Following table shows the nominal values during the calibration and the required recalibration accuracy Etalon Terminals Nominal Calibration Etalon Nominal Calibration value accuracy Termin2. RS 232 connection 4 5 Pin Text Type Description 2 TXD Output Sender 0000 e 3 3 RXD Input Receiver 5 GND GND Connector type D SUB 9 MALE Cable between OCM622 and PC configuration 1 1 pe pswipswa OcmM622 7 8 4 Remote Control via IEEE 488 Option IEEE488 contains following functions SH1 AH1 T5 L3 RL1 DC1 The instrument recognizes following commands DCL Device Clear sets the instrument into the basic function SDC Selected Device Clear same as DCL GTL Go to Local terminates the remote control LLO Local Lock Out switches off the keyboard The IEEE488 commands are identical with the RS232 commands 20 8 5 Demo Program A simple program is supplied with OCM 622 which supports the control via the data ports RS232 and IEEE 488 The installation diskette contains the program for WIN95 98 ME NT 2000 XP For IEEE488 the Demo Program requires properly configured National Instruments IEEE488 card Installing the program After SETUP EXE the installation program asks for the destination directory pre defined is R Decade and executes the actual installation The UNINST EXE program is also enclosed for deleting the directory from the system Program description After starting the program R decade following control panel is displayed EJ Resistance decade Communication Rate Com port RS232 19200 com Open Exit In Commu
3. 168 868 C Fried IPTS6S The upper row shows the simulated temperature C or the generated resistance Q The value can be directly overwritten with the keyboard and confirmed with ENTER The key ENTER switches between the numerical and the cursor entry The lower row shows the sensor type at the temperature simulation Pt 100 Ni 1000 etc The corresponding norm is shown when the Pt elements are selected US JIS for the US Norm IPTS68 or ITS90 for the european norm IEC 751 With the key MENU the setting mode is activated 6 4 Direct Entry 168 868 C C 162 6 With numerical keys the temperature value or resistance can be directly entered The recently entered value is displayed in brackets under the actually value Press the key ENTER to confirm the setting The key ESC terminates the entry The key BSP cancels the last entered value 10 6 5 Set Up Mode This mode permits setting and displaying of some auxiliary parameters To enter this mode push the key MENU in the standard mode With the cursor keys 4 following items can be displayed in the setup menu Function Fria Pt106 T Function With the keys lt gt following functions can be activated R Resistance Range 1 00000 Q to 12000000 Pt 68 Pt thermometer according to IEC 751 Temp Scale IPTS68 coeff 1 3850 Range 200 C to 850 C 328 F to 1562 F The zero value RO resistor value 0 C can be set from 10 Q to 20 0000
4. If gt Example F1 lt cr gt sets Pt100 sensor simulation 17 Switching off PO This command will switch off the instrument The command is executed if OCM6 22 is supplied from internal battery only without the external battery charger Correct execution is confirmed with string Ok lt cr gt lt lf gt Example PO lt cr gt switches decade off RO setting reading R lt DNPD gt This command sets the resistance value RO at the temperature O C The value RO is valid for all types of simulated temperature sensors lt DNPD gt lt represents resistance value RO in Q The limits are shown in chapter Specifications OCM 622 confirms the execution with a string Ok lt cr gt lt If gt In case of query OCM 622 returns the value in Q Example R100 lt cr gt sets RO to 100 Pt100 Ni100 After query R lt cr gt OCM 622 returns 100 lt cr gt lt lf gt Temperature unit setting U lt CPD gt 0 1 This command sets the temperature units e 0 degree Celsius C e 1 degree Fahrenheit F OCM 622 confirms with Ok lt cr gt lt If gt Example UO lt cr gt sets C Status reading V OCM 622 returns the status in form FxUx lt cr gt lt lf gt x are values corresponding to the actual status of the instrument Example After query V lt cr gt OCM 622 returns for example string F2U0 lt cr gt lt lf gt which means Pt
5. Ni 10000 Pt temperature standards Ni temperature standards Temperature coefficient Maximal dissipation power Maximal voltage Connection of terminals Connection of temp sensors Reaction time Terminals Interface Power supply Operating time from battery Reference temperature Working temperature Storing temperature Housing Dimensions table version Dimensions 19 module Weight IEC 751 1 3850 for IPTS68 IEC 751 1 3851 for ITS90 US US JIS 1 3916 DIN 43760 6180 gt lt 1 ppm C 1 Q 2kQ on terminals R4W lt 1 ppm C 100 Q 1200 kQ terminals R2W lt 5 ppm C 2 KQ 10 kQ on terminals RAW 0 3W 50 V DC 50 Vef AC on terminals RAW 120 V DC 50 Vef AC on terminals R2W 2 4 wire 2 3 or 4 wire 6 ms instrument terminals diameter 4mm gold plated RS232 as standard IEEE488 optionally internal battery 12 V tyoe LONG B WP 1 9 12 power line adapter 15 V 2A 100 240 V 6 hours 18 C 28 C 5 C 40 C 10 C 50 C ALU W 325 mm H 111 mm D 316 mm W 483 mm H 111 mm D 316 mm 4 5 kg Isolation between output terminals and housing gt 2 GQ at 500V DC Test voltage between output terminals and housing 1 kV AC 50 Hz Reaction time is the time between the setting of the value at the front panel or the reception of the command from the data bus and the resistance value generated at the output terminals
6. Note e The data shown with tolerances or with the band of limits are tested All other values have informative character e The output terminals may be opened for approx 1ms during the switching time of the relays Accuracy The specified accuracy is valid after 10 minutes warm up for an ambient temperature of 23 5 C The uncertainties include long term stability temperature coefficient linearity load and line regulation and traceability of the manufacturer s standards to the National Calibration Standards Accuracies assigned in are related to the set value Specified accuracy is valid for one year Resistance Accuracy R4W 1Q 4009 0 003 3 MQ 400 2000 Q 0 005 2000 Q 10000 Q 0 015 Maximal thermo voltage at theR4W terminals is lt 1 uV Resistance accuracy R2W Max thermo voltage at the R2W terminals is lt 5 uV for values 1 Q to 2 kQ For 2 KQ to 1 2 MQ is lt 15 uV Pt Simulation Accuracy Ni Simulation Accuracy Ni 100 Raw Ni1000 R4w Ni 10000 R2W 60 300 C 0 02 C 0 04 C 0 04 C Short and Open simulation version OCM622 Vx1xx only When function SHORT is selected the output resistance is lower than 100 mQ typically 50 mQ Maximal allowed current is 500 mA When function OPEN is selected the output resistance is higher than 1 GQ Maximal allowed voltages are 50 V rms with terminals R4W and 120 V DC 50 Vrms with terminals R2W Note The resistance valu
7. Pt 90 Pt thermometer according to IEC 751 Temp Scale IPTS 90 coeff 1 3851 Range 200 C to 850 C 328 F to 1562 F The zero value RO Resistor value 0 C can be set from 10 Q to 20 000 Pt US Pt thermometer according to US Norm US JIS coeff 1 3916 Range 200 C to 850 C 328 F to 1562 F The zero value RO Resistor value 0 C can be set from 10 Q to 20 000 Q Ni Nickel thermometer according to DIN 43760 coeff 6180 Range 60 C to 300 C 76 F to 572 F The zero value RO Resistor value 0 C can be set from 10 Q to 20 000 Q User Used defined range and curve Standard is NTC Thermometer with following polynom installed R T 330 exp 4050 1 298 15 1 T 273 15 Range 30 C to 110 C Short simulates short of the output terminals Function Short is Option Open simulates open of the output terminals Function Open is Option The positions appear at the lower line After ENTER they appear in the upper line RO Pt Ni Resistance at 0 C The parameter RO for temperature sensors can be set The value RO is valid for both Pt and Ni sensors A new value can be entered with the keyboard The permitted range is from 10 Q to 20 000 Q The new value is stored with ENTER 4W lt 2W the highest resistance value on R4W terminals This function permits settings of the resistance value when the output terminals switch from R4W to R2W Resistance values higher than 10
8. battery is fixed to the rear panel inside the cabinet 11 1 Battery maintenance The sealed lead acid maintenance free long life 12V 2 6Ah battery requires approx 40 hours for full charge It also has to be charged when the instrument is not in use for longer than 3 month To replace the battery use following steps e Disconnect the external power supply adapter and RS 232 IEEE488 cable e Switch off the instrument e Take out the 4 screws located in the corners of the rear panel e Remove the top cover e Disconnect connectors and release the battery e Replace the battery with the same type e Close the cabinet the opposite way as it has been opened 22 12 Ordering Information Data Output OCM622 V1xxx RS232 OCM622 V2xxx IEEE 488 Additional Options OCM622 Vx0xx none OCM622 Vx1xx Short Open Function Cabinet OCM622 Vxx0x table version OCM622 Vxx1x 19 Rack version ORBIT CONTROLS AG www orbitcontrols ch CH 8952 Schlieren ZH Tel 41 44 730 2753 23
9. 000 are available only on terminals R2W Lower values than 10 000 Q are available at the RAW terminals At the R2W terminals is the resistance also available but with lower accuracy The range of setting is 10 to 10000 Q 11 T unit Temperature Units With the keys lt C or F can be selected The key ENTER memorizes the selection Volume With the keys lt gt the beeper intensity of the keyboard can be adjusted The selection is from 0 to 15 The key ENTER memorizes the selection Baud rate RS232 baud rate or address of the IEEE488 Instruments with RS232 can have the baud rate selected with the keys lt gt for 300 600 1200 2400 4800 9600 or 19200 bd Instruments with IEEE488 data port can select the address from 0 to 30 The key ENTER memorizes the selection Lightning The display backlight can be switched on or off With the keys lt gt OFF lightning is switched off 30 s lightning is switched on for 30 sec after last key entry 5m lightning is switched on for 5 minutes after the last key entry or ON lightning is switched on The selected parameter is displayed in the lower row The key ENTER memorizes the selection If the instrument is supplied from the external power adapter the lightning is switched on all the time Note The display backlight influences significantly the operating time of the internal battery When the backlight is not used the battery operation time is about 50 longer
10. 8 4 622 Precision Resistance Decade ae 100 000 C 100 IPTS68 t 14 7 Verification The verification procedure is described in this chapter It is based on resistance measurement on the output terminals with standard multimeter in recommended points Required equippment e Ohm meter with accuracy of 0 001 ranging frrom 1 Q to 1 2 MQ e g Wavetek 1281 Instrument Setting Switch into the resistance mode Connect the multimeter with 4 cables to the output terminals Measuring Steps e output resistance on terminals R4W e output resistance on terminals R2W Procedure Use the following procedure to perform the parameter verification test 1 Switch both instruments on and let them for 1 hour stabilise in the laboratory ambient temperature 23 2 C Connect the terminals R4W to the ohm meter Set value 4W lt 2W to 10 kOhm in the SETUP menu 2 Check resistance values as shown in table Table Max Deviation on terminals RAW Nom Value Q Max deviation mQ 1 00000 3 03 2 00000 3 06 5 00000 3 15 10 00000 3 3 20 0000 3 6 50 000 4 5 100 000 6 0 200 00 9 0 500 00 25 1000 0 50 2000 0 100 5000 0 750 10000 0 1500 15 3 Connect the ohm meter to R2W terminals Use four wire connection to 10 kOhm Above 10k two or four wire connection can be used Set function 4W lt 2W to 0 Q in the SETUP menu 4 Check the resistance value in points according to Tab
11. 90 C actual setting 18 Setting of the resistance value for switching the terminals 2W 4W W lt DNPD gt This command sets value of the resistance for switching the output terminals from R4W to R2W and return lt DNPD gt This represents the resistance value in Q The limits are shown in chapter Specifications OCM 622 confirms the execution with string Ok lt cr gt lt lf gt In case of query OCM 622 returns the value in Q Example W2000 lt cr gt sets value to 2000 2 After query W lt cr gt the instrument returns a string 2000 lt cr gt lt If gt I D device identification IDN The response contains the name of the manufacturer the model the serial number and the firmware version Example If query IDN lt cr gt OCM 622 returns ORBIT M622 462351 2 4 lt cr gt lt lf gt When unknown command is received OCM 622 returns lt cr gt lt lf gt Correctly executed command is confirmed with Ok lt cr gt lt lf gt When a correct query is received OCM 622 responds in the above described form All commands must be terminated with lt cr gt or lt lf gt Small and capital letters are allowed 19 8 3 Remote Control via RS232 The transmission baud rate can be selected from 300 to 19200 Bd The telegram contains 8 bit no parity 1 Stop For the data flow the hardware handshake RTS CTS and the program handshake XON XOFF are switched off The RS 232 is isolated
12. OCM622_GB_2904 Precision Resistance Decade OCM 622 Owner s Manual ORBIT CONTROLS AG www orbitcontrols ch CH 8952 Schlieren ZH Tel 41 44 730 2753 INDEX 1 2 5 RESISTANCE DECADE OCM622 issccissssscecossdecsisesvessssscdescsevscasscenscessisnbsossseseseses ebsssssensese seinen 3 CONTENTS OF DELIVERY eissisidssessscscdssscesestastessteossudsancasesscsssecscabsasacscesseacesosoeasseustedessndcsdensetss 3 SPECIFICATIONS iiccscsessosssvestecssdnstesssvecsesensecsesvsossecvscesdevensosbesvesosssasesessessodevtaseodestecssbentoossiestoeses 3 PREPARING FOR OPERATION cssssscssssscccssssccccsscccscssccccssseccccssscccscssccscssaccccssnsesecsscesceses 6 4 1 SWITCHING ON cocococononononononononononononononononononononononononononononononononononononononononononononono nono nononononanonnnos 6 4 2 W ARMEUP TIME cdi tdci EA EE EEAS EA tddi cada 6 DESCRIPTION vesesiessesscescsssnsees case sucsiesesvassugasesssesctecsedvesesssesessoletuesecsssdstvesebtesuetessesstsi sessseussvessetesses 7 5 1 FRONTPANEL it 7 Keyboard nenne aa 7 ISP RAR Doh ial eGo Deed ea ela o 7 Output Terminals sisin poii di 8 5 2 REAR PANEL PERNE EAN EE E E o A E E 9 NI sede ceesedbssedesestacessuustocaes s 9 6 1 SWITCHING ON AND OFE 2 ta 9 6 2 STANDARD MODE CURSOR MODE occoconononononononononononononononononononononononononononononononononononononononos 10 6 3 STANDARD MODE NUMERICAL KEYS coococococononononononononononononononononononononononon
13. als value accuracy ROO R 4W 200 1mQ R18 R 4W 398 kQ 400 R01 R 4W 3 90 1 MO R19 R 4W 780 kQ 80 Q R02 R 4W 780 1 MO R20 R 4W 1540 kQ 200 Q ROS R 4W 1540 1 ma R21 R 4W 3020 kQ 400 Q R04 R 4W 30 50 1 MO R22 R 4W 5920 kQ 1 ko RO5 R 4W 60 50 1 ma R23 R 4W 12 MQ 5 ka RO6 R 4W 1200 2mQ R24 R 4W 23 MQ 50 kQ R07 R 4W 237 Q 3 MQ R25 R 4W 46 MQ 200 kQ R08 R 4W 464 Q 6 mQ R26 R 4W 85 MQ 500 kQ RO9 R 4W 909 Q 15 ma R27 R 2W4W 1780 Q 40 mQ R10 R 4W 1780 Q 30 mQ R28 R 2W4W 3830 Q 80 mQ R11 R 4W 3480 Q 100 mQ R29 R 2W4W 7870 Q 100 mQ R12 R 4W 6870 Q 250 MQ R30 R 2W4W 15 8 KQ 200 mQ R13 R 4W 13 5 KQ 500 MQ R31 R 2W4W 34 KQ 500 mQ R14 R 4W 26 6 KQ 10 R32 R 2W4W 75kQ 10 R15 R 4W 52 2 KQ 59 R33 R 2W4W 150 kQ 40 R16 R 4W 103 ka 100 R34 R 2W4W 301 kQ 100 R17 R 4W 202 kQ 200 R35 R 2W4W 602 ka 200 13 The process of calibration contains the measurement of the single resistors and writing their values into the memory The Etalon is selected with 4 e Measure the resistance with four wire method e Activate the keyboard with ENTER e Enter the new value The first line shows the original value the lower line the new value Fig 62 Baal it 62 F288 e Press ENTER to memorize the new entry e Repeat for all Etalons Recommended schematic for ROO to R26 Terminals R4W Digital Ohmmeter H OCM 622 Precision Resistance Decade POWER 100 000 C Pt100 IPTS6
14. cancels the whole entry and or closes the menu The key ENTER confirms the entry The same key switches between the numerical keys black print and the cursor function blue print The cursor function is shown at the display with T The key POWER switches the power ON and OFF To switch off the key has to be pressed twice Display The alphanumerical Display shows the operation parameters The upper line shows the main function the lower line shows the auxiliary parameters The right down corner displays following functions t Cursor Keys blue print at the keys E Remote operation via RS232 or IEEE488 REMOTE I Battery has to be charged Charger in operation Output Terminals The output resistance is available in four R4W or two R2W connections The upper four terminals R4W permits 2 and 4 wire connection in the resistance mode of operation and 2 3 or 4 wire connection when the decade is used as Pt Ni temperature simulator The range of setting is 1 Q to 10 kQ The max resistance value is determined by the selection of the type of the output terminals 4W or 2W The two wire connection R2W permits the settings from 1 Q to 1 2 MQ The terminals are automatically switched between R2W and R4W in accordance with the set resistance value Low resistance values are connected always to R4W terminals The switching level between R4W and R2W is programmable from 0 Q to 10 KQ in the MENU parameter 4W lt 2W Recommended 4W
15. erial by the internal microcontroller The connection is made by using precision relay with extremely low thermal voltage The used resistors are artificially aged foil resistors with extremely low temperature coefficient OCM622 features with very high accuracy and stability easy control and mains independent battery operation The instrument can be controlled from the front keyboard or remotely via RS232 or IEEE 488 data ports 2 Contents of Delivery RS232 version IEEE488 version Resistance decade OCM622 V1 xxx Resistance decade OCM622 V2xxx Power line adapter Power line adapter Cable RS 232 Demo program Demo program User s manual User s manual Test report Test report 3 Specifications The bellow specifications are valid for functions ranges with stated relative or absolute accuracy or specified limits Resistance range 1 000 00 9 1 200 000 Q SHORT OPEN terminals Version OCM622 Vx1xx only Pt temperature simulation 200 000 C 850 000 C 328 F 1562 F Ni temperature simulation 60 000 C 300 000 C 76 F 572 F Type of temp sensors Pt10 Pt20000 Ni10 Ni20000 Resolution 0 000 01 Q for 1 000 00 10 000 00 Q 0 000 1 Q for 10 0001 100 000 0 Q 0 001 Q for 100 001 400 000 2 0 01 for 400 01 1 200 00 Q 0 1 Q for 1200 1 30 000 0 Q 1 Q for 30000 1 200 000 Q 0 001 C for Pt10 Pt300 Ni10 Ni300 0 01 C for Pt301 Pt10000 Ni301
16. es in range 1 Q 1 2 MO are calibrated absolutely The resistance value is not defined against SHORT position The functions SHORT and OPEN are intended for functional checking of tested equipment only 4 Preparing for operation OCM 622 Resistance Decade is supplied from the internal battery or from the external mains adapter ranging from 100 V to 240 V 50 60 Hz The OCM 622 is laboratory device Its accuracy is guaranteed in a temperature range 23 5 C The instrument is designed for use in a horizontal or in a slope position The angle of slope is determined by the handle After unpacking let the instrument stabilized for one hour at the specified temperature 4 1 Switching on If the instrument is supplied from internal battery only push the button POWER If power line adapter is connected decade will switch on automatically After switching on internal tests are performed for approx 3sec The display shows the type of the instrument and the manufacturer The display switches into the last used mode before the power has been switched off The factory setting is 100Q 4 2 Warm up Time The instrument operates immediately after switching on After a 10 min warm up period it meets the specified accuracy 5 Description 5 1 Frontpanel OCM 622 Precision Resistance Decade R4W Pt100 IPTS68 ft R2W Keyboard The key MENU opens the setting and the calibration menu The key BSP cancels the latest entry The key ESC
17. le Il Table II Maximal deviation on terminals R 2W Value Q Max deviation Q 1 00000 0 01 10 00000 0 011 100 000 0 015 1000 0 0 060 2000 0 0 1 5000 0 0 25 10000 0 0 5 20000 0 1 0 50000 2 5 100000 5 0 200000 20 500000 50 1000000 100 1200000 120 8 Remote Control The standard version is equipped with RS232 data port The IEEE488 data port is described under 8 4 The commands for both versions are the same 8 1 Communication and Syntaxes The communication between the instrument and the PC consists of flow of periodically alternating commands type command response or query response The command is always a letter followed by parameter and ended by control sign lt cr gt or lt lf gt The response is always ended with lt cr gt lt If gt 16 Syntax description 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 represent a group of alternative character parameters e g 0 1 2 3 Flag indicating a request for the value of the parameter specified by the command No other parameters than the question mark can be used Flag indicating a request for the parameter specified by the command This command permits a value to be set as well as requested lt Cr gt carriage return ASCII code 13 This code executes the program line lt lf gt li
18. lt 2W value is 20009 Active terminals are indicated with LED at the front panel The terminal GROUND is connected with the cabinet 5 2 Rear Panel Netzadapter IEEE 488 Netzadapter The rear panel contains the charger jack and the data bus connector 6 Operation 6 1 Switching ON and OFF The instrument is always ON when the charger is connected to the mains When powered from internal battery the instrument has to be switched on with the POWER key To switch off press the POER key twice The instrument switches off automatically when during 20 minutes no key is operated One minute before the power is switched off a beep tone sounds Low battery is indicated by 1 symbol at the display 6 2 Standard Mode Cursor Mode When switched on the standard mode is activated and the display shows 104 a C Fried IFTS6S t The upper row shows the simulated temperature C or the generated resistance Q The lower row shows the temperature scale IPTS68 ITS90 according to the IEC751 or US JIS standards The arrow symbol informs about the activated cursor function of keys 2 4 6 8 blue prints With the keys T Y the selected position can be incremented or decremented With the keys lt the cursor can be moved left or right The key ENTER switches between the cursor and numerical type of entry When the key MENU is pressed the SET UP function is activated 6 3 Standard Mode Numerical Keys
19. ne feed ASCII code 10 This code executes the program line 8 2 Commands Value setting reading A lt DNPD gt This command sets the resistance or the temperature values lt DNPD gt It represents the resistance value in Ohm or simulated temperature in C The parameters of temperature can be set with negative or positive sign The resistance parameters can be set only with positive sign only In the Control Mode the instrument confirms the correct setting with Ok lt cr gt lt lf gt In case of query OCM 622 returns the resistance temperature values in the same format as it is on the display e g 120 C is returned as 120 000 lt cr gt lt lf gt Positive numbers are sent without the polarity sign Example If OCM 622 is in the temperature simulation function the command A123 564 lt cr gt sets the temperature to 123 564 C In the resistance mode the value of 123 564 Q is at the output terminals If query A lt cr gt is sent OCM 622 responds 123 564 lt cr gt lt lf gt Setting of functions F lt CPD gt 0 1 2 3 4 5 S 0O Following functions can be set resistance mode Pt 68 temperature sensor simulation Pt 90 temperature sensor simulation Pt US temperature sensor simulation Ni temperature sensor simulation User temperature sensor simulation Short simulation extra ordered option Open simulation extra ordered option onu rwum o OCM 622 confirms Ok lt cr gt lt
20. nication select RS232 or IEEE488 Set the COM and the baud rate When the IEEE488 is used set the address Start the program with Open The program checks if the instruments is connected If the instrument is found it can be controlled from the PC Use Output to enter the required value or select it with the arrows up or down by using the mouse Press Exit to terminate the program 21 9 19 Rack OCM 622 can also be ordered for 19 rack mount OCM 622 Precision Resistance Decade 132 5 Raw oo 100 000 C Pt100 IPTS68 t RAW Q o Es 465 1 483 10 Electric Function The internal resistors are switched in a binary code by using precision relays with very low thermal voltage The resistors are artificially aged and for high accuracy of the Tempco selected The LED at the front shows that the selected resistor value is connected to the terminals The metal cabinet is connected to the mains GND The 16 bit controller permits the settings and the selection of the mode via the keyboard or the data ports It supports also the display showing the parameters and the output values The electronics is supplied from internal battery A line battery charger is enclosed 11 Mechanical Construction The instrument is enclosed in aluminium cabinet The keyboard the display and the output terminals are located on the front panel External power supply jack and RS 232 connector are located on the rear panel Internal
21. ononononononononononos 10 6 4 DIRECT ENTRY ita 2 28 22 A anne aes via OLE SeeSee 10 6 5 SET UP MODE 5 5250 2 22 a Bethe Sele EEE Eee Sense 11 FUNCION FRASER BESET SIRENE DEL en E E E A en Bere 11 T unit Temperature Units ccccccceceseececesesceseseeesesesesseseseseescseneeceseseeseaeneeceaeeeeeeeneeeeaeeeseeeateees 12 Volume ze Dt a A e dd a as Kal ee CA 12 Baud rate RS232 baud rate or address of the IEEE488 nennen 12 UONI A il 12 6 6 CALIBRATION MIDE ds 13 ARI A O O 15 REMOTE CONTROL sesssscsssccssecvscsesssssnseenssesseesssocsusonsoess coestesescossdecsssesteossvusteossoscdecesdecdosusbenseess 16 8 1 COMMUNICATION AND SYNTAXES cccocococonoconononononononononononononononononononononononononononononononononononononononononos 16 S22 COMMANDS a renees 17 8 3 REMOTE CONTROL VA RI a E E R 20 8 4 REMOTE CONTROL VIA IEEE 488 OPTION scccccssseecesssececeesaececsenceceeseeecnesaeeecseseeeeeseeeeensaaes 20 8 53 DEMO PROGRAM ii 21 Date 11 2003 1 Resistance Decade OCM622 The resistance decade OCM622 has been designed for generation of very accurate resistance values for calibration of measuring instruments transmitters and thermometers It can also be used in automatic calibration setups in which the communication data ports RS232 or GPIB IEEE 488 are required The resistance value selected with the keyboard or through the data port is composed by 34 internal resistors optimally connected in parallel and or s
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