1048 User Manual - Time Electronics
Contents
1. Time Electronics 1048 Current Voltage Loop Calibrator Technical Manual D gt ms rme ergi wie V1 2 30 12 10 Time Electronics Ltd Botany Industrial Estate Tonbridge Kent TN9 1RH Tel 44 0 1732 355993 Fax 44 0 1732 770312 Email mail timeelectronics co uk Web Site www timeelectronics com 2 1 ad Contents WAT OCU THOMA EE 3 Front panel controls and Operating modes ccccceceseescceeeesescceeeaeescceeaaeeses 4 2 1 Operating Mode NORMAL eeeeeeeeeeseeeeeeeeeeeeeeeeeeeseeseneeeeseeeeeeeeeeeeees 5 2 2 Operating Mode EE 5 2 3 Operating Mode RAMP ss ssnnnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 5 Normal Operating Mode sssssessssseessssseesssssersssseerssssreressseerssssrersssseessseeeresssee 6 KAES ge lun e A le EE 6 3 1 2 Output polarity Switch 0 cece cece cece eeeeeeeeeeaeeeeeeeeeeeeesaaeseeaaeseeeeesaeessaeeeeneeeeaees 6 3 2 MGASUIE VONAGE E 7 3 3 MGASUTG Current eege Sae anae aan nan aanne aE Ra tani sie scannciatelsaetsvets 8 3 4 Power and calibrate transmitters SenSorfS nnsessnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnne 8 3 5 SOURCE VOM LE 9 3 0 SOURCE TT EE 9 3 7 Sink transmitter simulator TX SIM sssssssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnne 10 Additional Operating Modes cecccccsseescccesseecceceeeescceeseesceessueeseeeseaeseeees 11 AV STEP Wear all EE 11 4 2 STEP Autom ti x2. Step Mode calibration 7 6 Current Shunt Calibration 1 a Select normal mode operation by pressing the Increment and Decrement buttons simultaneously The CONTINUITY legend will then show on the top of the right side of the display b Select SRC on the Mode select switch c Select 22 on range switch d Select Norm on output switch e Select mA on the OFF V I switch 2 Connect a precision DMM to the output terminal and set it to 30 or 100 mA DC current range 3 Adjust the multi turn control until the display shows 19 000 use the INC DEC buttons for fine adjustment Make sure the unit is in high resolution mode i e 5 digit display If it has dropped back to low resolution 4 digit move output switch to Lo position and then back to Hi 4 Adjust P8 until DMM reads exactly 19 000 mA 5 Select 2 2 on the range switch select 3 or 10 mA range on DMM 6 Use similar procedure to 3 and 4 to calibrate at 1 9000 mA P6 7 Select 22 on the range switch Select 0 3 or 1 mA on DMM and use similar procedure to 3 amp 4 to calibrate at 190 00 UA P4 This completes the calibration of the current shunts V1 2 30 12 10 Page 19 1048 Technical Manual 20 7 7 Re Assembling the Unit Re assemble the unit in the reverse order as in 5 through to 1 Please note that there is some difficulty in returning eS Fy the printed circuit board ass
3. 220mV Accuracy 0 05 of span Resolution 10uV 0 199 99mV 0 1mV above 200mV Source output resistance Less than 2 ohms Max current 50mA Measure input resistance 1M ohm on all ranges Note Accuracies for all measure modes are 1 digit V1 2 30 12 10 Page 21 1048 Technical Manual 22 Sink TX SIM 2 wire transmitter simulation External excitation voltage 3V min 50V max The current sink levels are adjustable with accuracies as in the three mA source ranges shown on page 21 Output Steps 5 fixed steps for output 4 8 12 16 amp 20 mA 11 fixed steps for V output 0 1 2 10V 21 fixed steps for V amp output 0 1 2 20 Stepping can be done manually or can be set to run automatically up and down continuously with adjustable speed control 1 10 sec step Dwell time top and bottom 1 step period The resolution of the display is 3 5 digits and accuracy as source specification Output Ramp Current Ramp 4 to 20 or 0 to 20 on all ranges Voltage Ramp 0 to 10 or 0 to 20 on all ranges Ramp time 7 sec Dwell top amp bottom 5 sec Manual restart Ramp operation is also available in Sink TX SIM function Source Output Adjustment A ten turn potentiometer is provided for quick positioning with fine adjustment using up down incrementing buttons Power A single internal 9V PP3 size battery or an optional external mains power supply Battery life Typically about 15 hrs use A 15 minutes inactivity
4. Automatic This function provides a method of automatically stepping through the fixed output values e Set function switch to SRC e Set OFF V mA switch to the desired units V or mA e Set range switch to the desired range e Set output switch to NORM e Simultaneously press INC and DEC buttons The word CONTINUITY will appear on the display and the reading will go to zero The unit is now ready to enter the Auto Step function and automatically output the preset values determined by the switch on mode stated in section 4 0 a b or c e Press the INC button and hold for 1 second The display decimal point will start to flash and the output will cycle up and down through the fixed values The time step on each value may be varied from 1 to 9 seconds by adjusting the multi turn output control e To return to the Manual Step Function press the INC button The decimal point will stop flashing 4 3 RAMP When using either the Source or Sink functions RAMP provides a method of continuously increasing and then decreasing the output in a continuous fashion The output ramps up from 0 4 in the 4 20 selection to the full scale where it stays dwells for a fixed period before ramping down again to its starting value It dwells here again for a fixed period before restarting the cycle The ramp times are approx 7 secs and the dwell times approx 5 secs Ramp operation is available for both voltage and mA output e Set function switch
5. auto power down feature is also included to conserve the battery see page 13 section 5 3 Operating temperature 10 to 50 degC 0 to 120 degF Operating Humility 10 90 non condensing 25 degC 77 degF Dimensions 14 x 8 x 5 cm 280 gm 5 5 x 3 x 2in 100z Housing The 1048 is supplied in a rugged pocket size hard ABS case It comes complete with a leatherette carrying case Test leads not supplied can be stored inside the leatherette case Ordering Information Voltage Current Loop Calibrator 1048 Mains power supply 230V AC 7643 Mains power supply 115V AC 7652 NPL traceable calibration certificate C176 UKAS calibration certificate C138 V1 2 30 12 10 Page 22 1048 Technical Manual 23 9 Guarantee amp Servicing Guarantee Period This unit is guaranteed against defects in materials and workmanship for a period of one year from its delivery to the customer We maintain comprehensive after sales facilities and the unit can if necessary be returned to us for servicing During this period Time Electronics Ltd will at its discretion repair or replace the defective items For servicing under guarantee the instrument type and serial number must always be quoted together with details of any fault and the service required The purchaser of the instrument must prepay all shipping charges Time Electronics Ltd will pay return shipping charges This guarantee is void if servicing has been attempted by an unauthorised pers
6. from Hi to Lo to Hi There is a marking on the front panel below the switch to indicate this 3 1 2 Output polarity switch It is important for the user to understand the operation of the output polarity switch F on the front panel diagram section 2 The switch has three positions NORM OFF REV and its function depends on the operating mode being used Measure function V amp mA In the NORM position the unit will measure inputs connected in the same polarity as the terminals i e red is positive and black negative The OFF centre position when measuring voltage disconnects the signal internally and leaves the input terminals still providing 1M ohm input resistance The display should read zero but occasionally the last digit may show 1 this is normal and is within the specification The OFF position when measuring current disconnects the signal internally and leaves the input terminals still providing the current shunt input resistance The display should read zero but occasionally the last digit may show 1 this is normal and is within the specification The REV position is not used since the unit s measuring capability is bi polar i e it can accept both ve and ve input signals The ve inputs are displayed with a sign in front of the value V1 2 30 12 10 Page 6 1048 Technical Manual Source function V amp mA The NORM position outputs signals in the polarity indicated by the te
7. range is nominally 22mA span it can be safely used to measure current up to 70mA e Set Function switch to MEAS e Set OFF V mA switch to mA e Set Range switch to the desired range e Set Output switch to NORM e Connect the unit to the signal source observing correct polarity the current will be displayed with 3 5 or 4 5 resolution see Section 3 1 1 4 2 wire transducer transmitter Connect the unit to the sensor or transmitter observing the correct polarity The current drawn is displayed Measure Model gt Pow er Supply 3 4 Power and calibrate transmitters sensors If the loop s power supply is not available it is possible to use the unit s internal 22V supply to power the loop Set up the unit as described below e Set Function switch to SRC e Set the Multi Turn Output Control fully clockwise e Set OFF V mA Switch to mA e Set Range switch to the desired range e Set Output switch to NORM 2 wire transducer transmitter Sensor Connect the unit to the sensor or transmitter observing the correct polarity Measure amp Power Mode The current drawn is displayed V1 2 30 12 10 Page 8 1048 Technical Manual 3 5 Source Voltage The unit outputs voltage from 0 to 22V in three ranges 0 to 0 22V displayed in mV 0 to 2 2V and 0 to 22V Set function switch to SRC Set OFF V mA switch to V Set range switch to the desired range Set output switch to NORM Set multi turn output cont
8. to SRC or TX SIM e Set OFF V mA switch to desired units e Set range switch to the desired range e Set output switch to NORM e Simultaneously press INC and DEC buttons twice The CONTINUITY legend will appear flashing on the display The unit will now ramp up and down automatically between the range limits as determined by the range and V mA selected The alternative limits can also be used and are as determined by the switch on conditions as stated at the start of section 4 Note When the unit initially enters RAMP mode the first dwell period will be shorter than 5 secs To reverse the direction of the ramp at any time press the INC button once To restart the ramp immediately when it is waiting in the dwell period press the INC button once V1 2 30 12 10 Page 12 1048 Technical Manual 13 5 Operating Precautions 5 1 Display The LCD display should not be exposed to strong sunlight for prolonged periods 5 2 Usage amp Storage Temperature Operating 10 to 50 degC 14 to 120 degF Storage 30 to 70 degC 22 to 160 degF Humidity The operating and storage relative humidity limits are 10 to 90 non condensing at 25 deg C 77 deg F 5 3 Automatic power down disable If the unit is not operated for 15 minutes it will automatically power down to conserve the battery life This feature can be inhibited by pressing the INC button when switching on the unit It should be noted that the operation is indicated by fla
9. c sess sect ecedenccnent cet necenec enced anakana aauina Pasi non aeiia RENT ausi 12 Asc CT 12 Operating d en EN 13 Pools vU 13 52 gt SAGE be SlORAG LEE 13 5 3 Automatic power down disable ccccccesseeeeeeeeeeeeeeeeeeeeseneeeeeeeeeeeeeeenneees 13 POWEr S UP EE 14 6 1 Auto power dOWN EE ENEE eden edad EENS EEN 14 2 Battery E 14 6 3 Battery Replacement cccccccssssseeeeeeeeeeeeeseeeeeeeeeeeeeeeeeseaeeeeseseeeeeeeeeeeeeenees 14 6 4 Mains Power Supply Adaptet eecccccesseeeeeeeeeeeeeeeseneeeeneeeeeeeeeeeeeeeeneees 14 6 5 Fuse Replacement iis lecicc cokes cistiac etectaieastieeeincicrlha isa 14 WAITRESS INCE tee ee eet eer 15 TA UE 15 7 2 Dis Assembling the Unit eerste thn dint Een 16 Zoos trimmer Locations E 17 7 4 Measure Function Calibration csscssssssssssssssssssssssesssssessssssessseeeeeeees 18 7 5 Step Mode Calibration ccccscccesseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeaeeeeeeeeeeeeeeeeaneeeeeeeees 19 7 6 Current Shunt Calibration ssssssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnne 19 7 7 Re Assembling the Unit eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeseseeeeneeeeeseeeeensesennees 20 7 8 Calibration Certificates ssssssssnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnne 20 7 9 Front Panel Keypad and Connections ccecccceeseeeeeeeeeeeeeeeeeneeeeeeeeneeees 20 SPECIE EEN 21 Guarantee SS Le E 23 All Ti
10. ed by simultaneously pressing the INC and DEC buttons Every time they are pressed the next mode will be selected The mode at power up is NORMAL This is followed by STEP which is indicated by the CONTINUITY legend appearing in the top right section of the display The final mode is RAMP which is indicated by the CONTINUITY legend flashing 4 1 STEP Manual Considerably speeds up the calibration process as a simple push of a button enables the unit to manually step through standard calibration points 5 points in 4 20 11 points in 0 10 or 21 points in 0 20 e Set function switch to SRC e Set OFF V mA switch to the desired units V or mA e Set range switch to the desired range e Set output switch to NORM Simultaneously press INC and DEC buttons and the word CONTINUITY will appear on the display and the reading will go to zero The unit is now ready to manually step through the preset values determined by the switch on mode stated in section 4 0 a b orc Press the INC to step to the next output value Press the DEC button to step back to the previous output value NOTES a When choosing the 4 20 steps the initial value will be zero It will move to 4 at the first press and subsequently cycle between 4 and 20 in the regular 5 point pattern b The output switch will operate in the same way as for source V amp mA function V1 2 30 12 10 Page 11 1048 Technical Manual 12 4 2 STEP
11. embly to its correct F Sg rar eer TIME ELECTRONI position in the case It is important to initially position it so that the external supply socket the terminal end is adjacent to its hole in the case E The whole assembly should then be lowered into position as far as it will go it is important to have the OFF V mA and range switches to the OFF and 22 positions and the OUTPUT and MODE eat switches in OFF and MEAS positions It is then necessary to lever the multi turn shaft Voltage Curr i with a small screw driver towards the terminals Loop Caiibrai This will ease the output and mode switches forward enough to allow them to spring into their slots At the same time the INC DEC buttons may need to be re positioned slightly to allow them to go back into their holes 7 8 Calibration Certificates It should be noted that the previously listed procedures are used to set up the adjust trimmers that ensure that the unit will be within the manufacturer s specification To produce a full set of calibration results and a Certificate of Calibration the unit must be checked on all its ranges Good practice requires a minimum of 5 calibration points per range Time Electronics can supply calibration certificates for the unit either NPL National Physical Laboratories UK traceable or to UKAS standard Equivalent certificates will be available from calibration houses t
12. he value shown on the units display The excitation voltage must be in the range 3 to 50 volts dc The NORM OFF REV switch in not functional in the SINK mode e Set function switch to TX SIM e Set OFF V mA switch to mA e Set range switch to the 22 position e Set output switch to NORM e Set multi turn output control to minimum anticlockwise Indicator o Connect the unit in the loop observing correct polarity Set the current in the loop by adjusting the multi turn control coarse and the INC DEC buttons fine Pow er Supply V1 2 30 12 10 Page 10 1048 Technical Manual Sink Mode transmitter simulator 11 4 Additional Operating Modes These modes are designed to automate and speed up the process of testing and calibration The STEP mode allows simplified calibration It provides output steps of fixed value Three choices are available a 5point calibration 4 8 12 16 20 mA b 11 point calibration 1 2 3 4 5 6 7 8 9 10 V c 21 point calibration 1 2 3 4 5 18 19 20 mA or V The a and b choices are the defaults The c choice is obtained by powering up the unit while pressing the DEC button The RAMP mode provides a continuous ramp up down with dwell periods at the top and bottom Both voltage and current are available for ramping and the ramp limits can be selected as shown above i e for 5 11 or 21 point calibrations SELECTING THE OPERATING MODE The above operating modes are select
13. hroughout the world Time Electronics EasyCal Calibration System It should be noted that users who have access to the above system can obtain on request free of charge a copy of the manufacturers recommended calibration procedure Please specify either floppy disc or e mail for the delivery media 7 9 Front Panel Keypad and Connections The Front Panel should be cleaned by wiping with a damp cloth Solvents must not be used as damage may result When connecting cables the screwed terminals should be hand tightened only V1 2 30 12 10 Page 20 1048 Technical Manual 21 8 Specifications DC Current Source and Measure Span 0 22mA Source 0 22mA and 22 70mA Measure Source Accuracy 0 02 of range Measure Accuracy as source 0 22mA above 22mA 0 05 Resolution 1uA 0 19 999mA 10uA above 20mA Span 0 2 2mA Accuracy 0 02 of range Resolution 0 1uA 0 1 9999mA 1uA above 2mA Span 0 220uA Accuracy 0 05 of range Resolution 0 01uA 0 199 99UA 0 1uA above 200UA Max source load 11000ohms 20mA Max drive 22V Max measure load 0 22 2 2 22 mA ranges are 1K 110 16 ohms DC Volts Source and Measure Span 0 22V Source and 0 22V and 22 50V Measure Source Accuracy 0 02 of span Measure Accuracy as source 0 22V above 22V 0 05 Resolution 1mV 0 19 999V 10mV above 20V Span 0 2 2V Accuracy 0 02 of span Resolution 0 1mV 0 1 9999V 1mV above 2V Span 0
14. l knob by levering it off j with a fine bladed screwdriver or similar tool KL C Remove the collet nut inside the knob Use a suitable split head screwdriver or small long nosed pliers D Remove the knob and then the hexagon nut below it use the correct sized spanner or pliers Take care not to damage the front panel label E Gently press on the shaft of the multi turn control to release the printed circuit assembly and battery from the case Do not attempt to remove it completely leave the case sitting vertical and the assembly flat horizontal lt orrrreprererert EE AR E e Zeen V1 2 30 12 10 Page 16 1048 Technical Manual P9 P2 7 3 Trimmer Locations i COU e E V1 2 30 12 10 Page 17 1048 Technical Manual 18 7 4 Measure Function Calibration 1 a Switch on the unit while holding down the Decrement DEC button left side Select the V position b Select MEAS on the Function switch c Select 0 22 on the Range switch d Select NORM on the Output switch Note It may be necessary to check the required switch positions by looking at the markings 2 on the front panel Connect the precision DC voltage calibrator to the unit s terminals and select zero output Check that the unit is displaying 00 00 Note that it may take a short while for the connection leads to stabilize thermally and settle down Inject 190 00 mV from the calib
15. me Electronics instruments are subject to continuous development and improvement and in consequence may incorporate minor detail changes from the information contained herein V1 2 30 12 10 Page 2 1048 Technical Manual 1 Introduction The 1048 is a current voltage and loop calibrator that meets the needs of R amp D labs and process control engineers It provides source and measure functions in three current and voltage ranges plus a transmitter simulator sink function Accuracy is 0 02 of span and it has 4 5 digit 0 005 of span resolution Output modes include steps and ramps No menus to learn just switches and buttons A multi turn potentiometer controls coarse output adjustment while increment decrement buttons are provided for fine control The source output can be reversed and zeroed at the flick of a switch The front panel features a large easy to read 4 5 Digit LCD display that auto ranges to allow the ranges to be extended by 10 above the normal 0 2 2 0 20 full scale Manual reset of the ramp function is also provided for quick restore The unit is powered by a PP3 Alkaline battery that lasts approximately 15 hours Continuous operation in the current mode will shorten the battery life The unit will indicate Low Battery when the battery needs changing When used as a source the output can be zeroed and reversed to enable the calibration of centre zero type voltage or current instruments e g 10V to 0
16. mode it initiates automatic stepping When in Ramp mode it re starts the ramp 3 position function switch for source SRC measure MEAS and transmitter simulation TX SIM V1 2 30 12 10 Page 4 1048 Technical Manual 5 The unit has three principal operating modes 2 1 Operating Mode NORMAL Provides manual operation of the standard measure and source functions for both voltage and current A transmitter simulation sink TX SIM function is also included for loop test and calibration The internal power supply can also be used to provide the drive voltage to passive process control transmitters and sensors This allows them to be calibrated without the need for the loop power to be connected 2 2 Operating Mode STEP Provides output steps of fixed value Three options are available a 5point calibration 4 8 12 16 20 mA b 11 point calibration 1 2 3 4 5 6 7 8 9 10 mA or V c 21 point calibration 1 2 3 4 5 18 19 20 mA or V The stepping between the calibration points can be done manually see Section 4 1 or can be set to proceed automatically at an adjustable rate see Section 4 2 2 3 Operating Mode RAMP Provides a continuous ramp up down with dwell periods at the top and bottom Both voltage and current are available for ramping see Section 4 3 SELECTING THE OPERATING MODE The above operating modes are selected by simultaneously pressing the INC and DEC buttons Every time they are pressed the ne
17. on or agent If during the guarantee period failure is due to misuse or abuse of the unit the repair will be put in hand without delay and charged unless other instructions are received Please note that if you require a new UKAS Certificate during the warranty period this will be charged at the current rate on our price list Service After Guarantee Period Even after the guarantee period has expired Time Electronics Ltd can still service your instrument As the manufacturer we have the specialised knowledge needed to keep your instrument in peak condition and we also maintain a comprehensive spare parts service Please enclose details of the service required and your full company details including a contact name when returning for servicing Returning Instruments When returning instruments please ensure that they have been adequately packed preferably in the original packing supplied Time Electronics Ltd will not accept responsibility for units returned damaged Please ensure that all units have details of the service required and all relevant paperwork Send the instrument shipping charges paid to Time Electronics Ltd Botany Industrial Estate Tonbridge Kent TN9 1RH Tel 44 0 1732 355993 Fax 44 0 1732 770312 Email mail TimeElectronics co uk Web Site www TimeElectronics com Disposal of your old equipment 1 When this crossed out wheeled bin symbol is attached to a product it means the product is covered by
18. ra Connection is via the small jack plug socket on the terminal end of the unit 6 5 Fuse Replacement The unit is fitted with a F100 mA fuse Switch off the unit and disconnect the battery Slide off the back cover to access the fuse The fuse is located adjacent to the battery Fuse length 20mm x 5mm TE code 6107 V1 2 30 12 10 Page 14 1048 Technical Manual 7 Maintenance 7 1 Recalibration Calibration equipment required A A precision DC voltage calibrator with an accuracy of 0 01 or better Examples of suitable instruments are Time Electronics 1017 5018 5025 or 5051 B DMM with accuracy of 0 01 or better Examples of suitable instruments are Time Electronics 5075 or 5065 Note It is advisable to use leads with low thermal emf connections This will ensure that stray thermal emfs do not cause errors when calibrating the low voltage range 22V which has a setting resolution of 10uV The unit connected to a Time Electronics 1017 Precision 0 005 DC V amp calibrator The unit connected to a Time Electronics 5065 6 5 digit Precision DMM V1 2 30 12 10 Page 15 1048 Technical Manual 7 2 Dis Assembling the Unit A Ensure that the unit is switched off before removing the rear panel which slides out Note The plastic cover retaining clip will need to be removed prior to sliding cover off refit when reassembled o E pm B Remove the cap on the multi turn contro
19. rator and adjust P3 for the correct reading on the display Select 2 2 on the Range switch and inject 1 9000 V from the calibrator Adjust P5 for the correct reading on the display Select 22 on the Range switch and inject 19 000 V from the calibrator and adjust P7 for the correct reading on the display Reduce the output from the calibrator to 1 9000 V and reading on the display Return to test above and re check the 22V range There is a small amount of interaction of P5 and P7 Finally re check the 2 2V range to ensure that it has not changed Over Range check The unit allows measurement up to 50V on the 22V range This can be checked by injecting 30 40 50V This completes the calibration of the measure function and the precision DC calibrator can be disconnected V1 2 30 12 10 Page 18 1048 Technical Manual 7 5 Step Mode Calibration 1 a Select SRC on the Mode select switch b Select 0 22 on range switch c Select Norm on output switch 2 Enter the step mode by pressing the Inc and Dec buttons simultaneously The CONTINUITY legend will then show on the top of the right side of the display Press the DEC button twice Note Make sure that the unit was switched on with the DEC button held down 3 Adjust P9 for 100 0 on the display 4 Press Inc 20 times until the display shows approximately 200 Adjust P2 for 200 0 on the display This completes the
20. rminals The REV position reverses the polarity When outputting voltage or current the OFF position disconnects the output signal and places an open circuit on the output terminals The display will read zero PS When the switch is in the REV position it should be noted that the display does not place a annunciator before the value TX SIM function The switch is not used for this function and has no effect at all STEP and RAMP modes In both these modes the function switch is in the source SCR position and the NORM OFF REV switch performs in the same way as in the NORMAL operating mode i e conventional V and measure source 3 2 Measure Voltage The unit measures dc voltage in three selectable ranges 0 to 0 22V displayed in mV 0 to 2 2V and 0 to 22V plus over range to 50V SPECIAL NOTE Although the top range is nominally 22V it can be safely used to measure voltages up to 50V e Set Function switch to MEAS e Set OFF V I switch to V e Set Range switch to the desired range e Set Output switch to NORM e Connect the unit to the signal source observing correct polarity the voltage will be displayed with 3 5 or 4 5 resolution see section 3 1 1 Measure Mode V1 2 30 12 10 Page 7 1048 Technical Manual 3 3 Measure Current The unit measures current in three selectable ranges 0 to 0 22mA displayed in uA 0 to 2 2mA and 0 to 22mA plus over range to 70mA SPECIAL NOTE Although the top
21. rol to minimum anticlockwise Receiving instrument Connect the unit to the process instrument observing correct polarity and adjust the multi turn output control for coarse control and INC and DEC buttons for fine control Source Mode NOTE 1 The maximum output current is limited to approx 50mA 2 The units output resistance is approx 2 5 ohms Therefore the user should be aware of the loading implications a load of 2 5K ohms will produce a 0 1 error in the output voltage To maintain full accuracy the maximum load should be restricted to 1 1K ohms 3 6 Source Current The unit outputs current from 0 22mA in three selectable ranges 0 to 0 22mA displayed in uA 0 to 2 2mA and 0 to 22mA e Set function switch to SRC e Set OFF V mA switch to mA e Set range switch to the desired range e Set output switch to NORM e Set multi turn output control to minimum anticlockwise Receiving instrument Connect the unit to the process instrument observing correct polarity and adjust the multi turn output control for coarse control and INC and DEC buttons for fine control Source Mode V1 2 30 12 10 Page 9 1048 Technical Manual 10 3 7 Sink transmitter simulator TX SIM In the Sink function the unit simulates a process field transmitter as part of a loop testing and calibration operation The unit takes its excitation power from the loop and acts as a variable resistance to adjust the loop current to t
22. shing the decimal point at the switch on time V1 2 30 12 10 Page 13 1048 Technical Manual 6 Power Supplies 6 1 Auto power down If the unit is not used for 15 minutes it will automatically power down to conserve the battery life This feature can be disabled by holding down the INC button whilst switching on the unit 6 2 Battery Life The unit is powered by a PP Alkaline battery that lasts approximately 15 hours of normal operation Continuous operation on current will shorten the battery life The unit will indicate Low Battery when the battery needs changing A short period of operation is possible when Low Battery is showing but no more than a few mA will be available at the output 6 3 Battery Replacement Slide off the back cover of the case and remove necessary to remove the battery and re charge it externally the battery from its compartment Unclip the yy battery and replace it with a new PP3 Alkaline SE Ga 3 Lo The NiCad NiMH rechargeable version of this y 3 5 battery may be used However it should be aS Ie ta noted that if the optional mains power supply y Gi 3 2 adapter see below is used to power the unit A gt D i the battery will not be re charged It is S amp S R d a WC 6 4 Mains Power Supply Adapter The unit can be operated from an external 12V dc 100 mA mains power supply unit This is available as an optional ext
23. the European Directive 2002 96 EC 2 All electrical and electronic products should be disposed of separately from the municipal waste stream via designated collection facilities appointed by the government or the local authorities 3 The correct disposal of your old appliance will help prevent potential negative consequences for the environment and human health Ee 4 For more detailed information about disposal of your old appliance please contact your city office waste disposal service or return to Time Electronics V1 2 30 12 10 Page 23 1048 Technical Manual
24. to 10V If the unit is not operated for approximately 15 minutes it will automatically power down to conserve battery life If required this feature can be disabled in the user set up The unit is constructed in a rugged pocket size hard ABS case and supplied with leatherette carrying pouch Leads can be stored in the pouch Receiving instrument 2 wire transducer transmitter Sensor Measure Mode Source Mode Pow er Supply 2 wire transducer transmitter Sensor Measure amp Power Mode Sink Mode transmitter simulator V1 2 30 12 10 Page 3 1048 Technical Manual 4 2 A Terminals B Display C OFF V mA switch D Decrement DEC E Multi Turn Output Control F Output switch A Th So Oe Front panel controls and operating modes G Range switch H Increment INC l Function switch Uebst ieieg age eA 7 Input Output terminals 4 5 Digit LCD Display 3 position switch for ON OFF OFF Volts V Current mA Push button for fine decreasing DEC of the output 10 turn control for coarse output adjustment 3 position switch normal NORM zero OFF reverse REV output Also used to restore high resolution display 3 position range switch 22 2 2 0 22 Push button for fine increasing INC of the output Also used in conjunction with the DEC button to select the modes of operation i e Normal Step and Ramp When in Step
25. xt mode will be selected The mode at power up is NORMAL This is followed by STEP which is indicated by the CONTINUITY legend appearing in the top right section of the display The final mode is RAMP which is indicated by the CONTINUITY legend flashing V1 2 30 12 10 Page 5 1048 Technical Manual 6 3 Normal Operating Mode 3 1 1 Resolution high low The unit has a unique method of changing the display resolution when values greater than the conventional 19999 4 5 digit display are used This feature allows the units ranges to be extended by 10 above the commonly used 0 2 2 0 20 full scales Calibration of values just above these figures is now possible This will be found particularly useful with 4 20mA transducers where they are slightly over scale but are still within specification For both measure and source functions high resolution 4 5 digit e g 1 9999 will apply for all values below e 0 20 on the 0 22 range e 2 0 on the 2 2 range e 20 on the 22 range All values above those above will be displayed to 3 5 digit resolution e g 21 05 The change over from high to low resolution is automatic However if the value increases and the resolution changes from high to low it will not return to high resolution until the value is reduced to e 0 10n the 0 22 range e 1 0 on the 2 2 range e 10 on the 22 range To force the display back into high resolution the output polarity switch should be operated
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