1077 User Manual - Time Electronics
Contents
1. Time Electronics 1077 Transim Transducer Line Simulator Technical Manual ae Time Electronics n V1 1 04 11 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 AAN 7 Contents Iit roO C CELO Dic ee E eni e OO e C dde C e e C e e Cn 3 A E ER ROTER EROR Re 4 Front Panel Contr lSs soiorn ns 6 AAA A E a E E EEE E EEEE E E EEE E a 8 4 1 Principle of Operation of the 2 Wire 4 20mA System 8 4 2 Checking Calibrating the Transducer esee 9 4 3 Checking Calibrating the Recorder eeeeeeeeeeeeeeennnn nnn 9 4 4 Test Calibrate Current Meter Recorder and Power Unit 9 4 5 Setting the Output Voltage eeeeseeeeeeeeeeeee e eeeeeeee nennen nnn 9 4 6 Operation as a Current Load eeeeeeeeeeeeeeeeeeeneererrnnnnnnnn 10 4 7 Operation as a Current Source eeeeeeeeeeeeeeeeeeee enne 11 4 8 Operation as a Line Simulator eeeeeeeeeeeeeeeeeeeeeennennn nnn 12 4 9 Rechargltig aeree i na ee ene eee 13 Circuit Des cripta sic 14 5 1 Power Supply cuca dni dit 14 5 2 Mains Re charger ener rene tno nite cu een indu nn2. 1 Power Supply The batteries and power supply circuitry is located on the bracket which is mounted below the battery level indicator Eight AA size rechargeable batteries provide an output of 9 6 volts D C to power a switched mode regulator which generates all the regulated supplies for the 1077 and the adjustable output voltage The rechargeable battery is protected by a miniature fuse mounted on the board The fuse is rated at F1A and has dimensions of 20mm length by 5mm diameter 5 2 Mains Recharger The mains recharger is a separate unit and enables the 1077 batteries to be fully charged in 12 14 hours An overnight charge is usually adequate The mains input is 200 240 volts 50 60 Hz standard 100 120 volts 50 60 Hz are available but should be specified on ordering The plug and socket are shaped to ensure that they cannot be connected in the wrong polarity 5 3 Circuit Module and Range Switch The 1077 active circuitry and range switch are located on a printed circuit board which is mounted on the front panel Connection to the P C B is via a 9 pin connector The active circuitry is encapsulated and contains the precision reference circuitry and output stage Four calibration trimmers are mounted on the P C B ref section 6 4 A replacement procedure should be adopted in the case of failure 1077 Technical Manual Page 14 6 Maintenance 6 1 Dismantling the Instrument Remove rubber protection boot and then removal of
3. Case option Power Supply 0 to 100 milliamps in 3 ranges 0 99 99mA in 10 uA steps 0 9 999mA in 1 uA steps 0 999 9uA in 0 1 uA steps 0 02 of setting 0 02 of range 0 02UA Better that 60ppm per deg C A front panel LED indicator provides indication of insufficient terminal voltage Adjustable from 14 to 40 volts Source mode 2 5 watts maximum 3 volts minimum to 40 volts maximum Load mode Variable between 14 and 40 volts by rear panel control Current limited to 100 milliamps max or 2 5 watts A 3 5 digit LCD meter displays output current up to 20mA with a resolution of 100uA 200mm x 75mm x 110mm 1 1kg 1 5kg including protective cover 210mm x 87mm x 117mm Weight 300g 8 NiMH rechargeable batteries with external mains re charger Recharge time approximately 12 hours Operating time approximately 10 hours before a recharge 1077 Technical Manual Page 4 Page left blank intentionally 1077 Technical Manual Pagel5 6 3 FrontPanel Controls ES Time Electronics Output Voltage Limit A off on eZ 1077 TRANSIM Model 1077 Line i Load O Source ra one 9999 9 999 9999 ON OFF mA Range BATTERIES 1077 Technical Manual Page 6 10 11 Output Terminals The output current is available on the two front panel terminals which are suitable for normal wire compression or 4mm plug insertion Case Terminal Co
4. eran niim en ER nana sa aida 14 5 3 Circuit Module and Range Switch esee 14 uitium 15 6 1 Dismantling the Instrument eeeeeeeeeeeee eene 15 6 2 Fuse Replacement cosita 15 a IC eC 15 6 4 INTRONS soca hs a etched he epee Beare sek ee teen cote seaside 16 Guarantee amp Servicios can 18 All Time Electronics instruments are subject to continuous development and improvement and in consequence may incorporate minor detail changes from the information contained herein 1077 Technical Manual Page 2 1 Introduction The 1077 is a portable hand held instrument designed for the testing and simulation of current transducers The three operating modes of the 1077 are 1 Aprecision adjustable current load capable of taking 100mA from a 24V supply 2 ADC 24 volt supply with a 0 20mA output current display 3 Aprecision adjustable current source capable of driving up to 100mA through 250 ohms or 20mA through 2 000 ohms The unit is powered from internal rechargeable cells and is supplied in a carry case making the 1077 ideal for field or site measurements 1077 Technical Manual Page 3 2 Specifications Current Source and Load Current Range Accuracy Output Stability Voltage Limit Drive Voltage Drive Power Applied Voltage Transducer Line Simulation 24 Volt Output Output Current Meter General Dimensions Weight Carry
5. four 2 0mm CSK screws enables the blue cover to be taken off which provides access to all parts of the instrument The range switch assembly can be removed by disconnecting the 9 pin connector and removing the two front panel locating screws 6 2 Fuse Replacement The power supply and output fuses are easily accessible on removing the cover panel 6 1 Fuses are rated at F1A F1 and F250mA F2 and have dimensions 20mm length by 5mm diameter The fuses are available from Time Electronics Ltd or your local supplier Alternative types of the same dimensions and ratings may be used 6 3 Repair Due to the precision nature of many of the components used in the 1077 they are not readily available to enable the customer to undertake repairs Important Note No repair work should be undertaken by the customer while the 1077 is under warranty Such work may invalidate the warranty Overload conditions can cause the fuses to blow and the following conditions will be observed 1 The instrument is inoperative and the battery level indicator does not operate when the 1077 is switched on A possible cause is that the power supply fuse F1 is blown see 6 2 2 The battery level indicator displays but no output appears at the output terminals A possible cause is that the output fuse F2 is blown Fuse Location BATTERY PACK Sl dn 0 BATTERY PACK
6. will supply the necessary voltage to drive the current set on the thumbwheel switches through the recorder should the voltage required to drive the set current be greater than the maximum voltage the 1077 can produce the voltage limit light illuminates indicating that the set current is not being driven The current meter recorder can be checked by driving in set currents and observing the corresponding deflection 4 4 Test Calibrate Current Meter Recorder and Power Unit The Load mode of the 1077 simulates the transducer in which the current set on the thumbwheel switches is taken from an externally applied voltage which must be between 3 and 30 volts In this mode it is possible to disconnect the transducer from the loop and connect in its place the 1077 the current registered on the recorder being the current set on the 1077 In this way the power unit recorder and wiring of the loop are checked 4 5 Setting the Output Voltage The maximum terminal voltage the 1077 will supply in any mode can be set by the Output Voltage Control To adjust remove the 1077 from the carrying case and locate the Output Voltage adjustment to the right of the Battery Level Indicator a small screwdriver will be necessary if adjustment is required Turn on the 1077 and select line mode Turn the output on and measure the terminal voltage with a voltmeter Adjust to new voltage with output voltage control if required Note 1 This control also s
7. F2 F250mA fn k ELFIA and 1077 Technical Manual Page 15 6 4 Calibration The 1077 is calibrated when it leaves the factory and should not require further adjustment for at least 12 months unless the circuit module or any of the calibration determining components have been changed Before attempting recalibration it is important to ensure that the correct equipment is available Equipment Required 1 D C voltage source power supply for 24V at 100mA 2 Precision DMM 0 01 with 100mA 10mA and 1mA current ranges and 100 volt range A Calibration of Current Source Sink Zero Adjustment Note Check the battery conditions before recalibration Turn the 1077 ON and select Source mode with the function switch Select 100mA range on the 1077 and set the digit switch to 0005 Connect the output of the 1077 to JIERO the DMM Select the 1mA range on the DMM Turn the 1077 output ON and adjust zero trimmer to give 50uA reading on the DMM 10mA Range F S D Adjustments Select 10mA range on DMM Select 10mA range on 1077 and the digit switch set to 9999 Adjust VR2 10mA trimmer to bring within required accuracy 1mA Range F S D Adjustments Select 1mA range on DMM Select 1mA range on 1077 Adjust VR4 1mA trimmer to bring within required accuracy 100mA Range F S D Adjustments Select 100mA range on DMM Select 100mA range on 1077 an
8. Load and turn output switch ON Note If V limit LED illuminates the 1077 has insufficient drive voltage to output the current set See Output Voltage Control Section 1077 Technical Manual Page 11 12 4 8 Operation as a Line Simulator Transducer rae 24 Volts 9 E Time Electronics om wei on gt On As acurrent source the 1077 will supply the set current to the load 24 Volt Line In this mode the 1077 supplies a constant 24V The current taken by the transducer can be accurately measured on the 1077 1 Turn on the 1077 and select the line position of the load line source switch 2 Turn the output switch ON 3 Read output current on the LCD display 1077 Technical Manual Page 12 4 9 Recharging To charge the 1077 first turn off the 1077 then connect the charge to the recharge socket on the end of the 1077 The connector is polarized to prevent accidental reversal Plug charger into mains supply If the 1077 is left ON when recharging the cells will not fully recharge The 1077 contains Nickel Metal Hydride batteries which are monitored by the battery level indicator at the end of the unit The unit will take approximately 12 14 hours to fully recharge the batteries The 1077 may be left on charge continuously without damaging the batteries Important Always recharge when the battery level indicator shows minimum 1077 Technical Manual Page 13 5 Circuit Description 5
9. ce mode displays Zero Output Voltage Adjustment Sets maximum open circuit voltage in Source mode and output voltage in Line mode normally set for 24V output 1077 Technical Manual Page 7 4 Operation 4 1 Principle of Operation of the 2 Wire 4 20mA System To fully understand the operation of the 1077 a working knowledge of the 4 20mA system is required A short explanation follows The basic requirements for any transducer with remote display is a To use as few wires as possible b That errors are not introduced into the signal from the transducer by the effects of interference or voltage drop due to lead resistance c To supply power to the transducer to enable amplifiers to be built into the transducer when the signal produced by the sensing element is too small to be transmitted without amplification In the 4 20mA system the transducer is supplied with D C power by a 2 wire line The transducer takes a current from the line proportional to the stimulus pressure temperature etc By measuring the current flowing in the line the output of the transducer can be monitored As the signal is transmitted as a current lead resistance and voltage drip do not affect the accuracy Hence the basic requirements are fulfilled using just two wires the minimum possible To enable a certain amount of standardisation and to compensate for voltage drop and variation in the supply transducers are designed to operate o
10. d the digit switch set to 9999 Adjust VR3 100mA trimmer to bring within required accuracy B Load Function Tests 1077 Technical Manual Page 16 17 Set the 1077 to Load function with 10mA range and digit switch set to 9999 Connect the 24V supply to the 1077 through the DMM Check the 1077 takes 10mA from the 24V supply C Linearity The linearity of the output is not adjustable and is determined by the precision resistors mounted on the digit switch These have been selected and adjusted in the factory and should not require further alteration D LCD Current Meter F S D VR1 1 Set the 1077 to line mode and take 20mA from the output 2 Adjust VR1 on LCD meter for 20 00 milliamps 1077 Technical Manual Page 17 18 7 Guarantee 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 ser
11. ets the maximum terminal voltage that will be applied in the Source mode Note 2 The maximum output voltage at 100mA will be 24V 1A x 24V 2 4 watts regardless of the setting of the Output Voltage control 1077 Technical Manual Page 9 10 4 6 Operation as a Current Load Transducer Simulation SUPPLY As a current load the 1077 Will draw the current set from the line 1 Turn on 1077 check battery level and select current range nearest to load current required Select the load position of the load line source switch Connect output terminals to the line e Positive terminal red to positive line e Negative terminal black to negative line 4 Set load current required on the digit switch 5 Turn output switch ON Warning Any attempt to connect the 1077 to a line with more than 40 volts potential on it will cause the 1077 output fuse to blow Note If V limit LED illuminates the 1077 has insufficient drive voltage to output the current set See Output Voltage Control Section 1077 Technical Manual Page 10 11 4 7 Operation as a Current Source mA e Jul e Q Time Electronics om tte on on As acurrent source the 1077 will supply the set current to the load Check the setting of the output voltage control as in Section 3 1 Turn on and select Source mode Select most suitable range and set output on digit switches pe pe mox Connect
12. nnected only to the instrument case and is isolated from the circuitry The case provides an overall electrostatic screen and can be earthed as required to improve rejection of noise pick up Output On Off Switch Disconnects the output terminals from the 1077 circuitry The Off position provides an open circuit on the output terminals Range and Supply On Off Switch Four press button switches with interlocking on the 3 range buttons to ensure that only one range can be selected at one time Digit Switch Four decade thumbwheel switches with 0 9 positions on each decade Voltage Limit Indicator An L E D display which indicates when the 1077 has insufficient voltage across its output terminals to sink or drive the set current Important Note Voltages in excess of 40 volts across the output terminals will cause an overload condition in the 1077 and the output fuse will blow Battery Level Indicator Located on the side of the instrument and continuously monitors the battery voltage A minimum mark indicates when the batteries need recharging Re charger Socket Also located on the side of the instrument The mains re charger is a separate unit and the output is via a flying lead with a non reversible plug Charge current is 50 mA and recharge time is 12 14 hours Load Line Source Switch A three position switch which selects the function of the 1077 LCD Meter Displays the output current taken when operating in Line mode in Load Sour
13. product it means the product is covered by 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 al 4 For more detailed information about disposal of your old appliance please contact your city office waste disposal service or return to Time Electronics 1077 Technical Manual Page 18
14. ver a wide voltage range usually between 15 30 volts and to take a Zero current of 4mA and a full scale current of 20mA The simplest 4 20mA current loop system is of 3 parts although often 2 parts are incorporated in the same box The 3 main parts are 1 D C Power supply usually 24V 2 4 20mA current meter recorder 3 The transducer The DC power supply generates the drive power for the system and can be considered as a battery The 4 20mA meter recorder can be a passive moving coil mA meter with a zero offset to obtain a reading current must be injected The transducer completes the loop and allows a current to flow round the loop dependent on the level of stimulus to the transducer it can almost be considered as a potentiometer changing in resistance to let between 4 and 20mA flow The 1077 can be used to calibrate test any part of this system by using the 1077 in its 3 operating modes 1077 Technical Manual Page 8 9 4 2 Checking Calibrating the Transducer By selecting the line simulation mode on the 1077 the 1077 acts as the 24V D C supply and the current meter any current taken from the 24V across the 1077 terminals will be registered on the L C D meter The current taken by a transducer can therefore be easily checked by connecting the transducer directly to the 1077 and then reading the current shown on the meter 4 3 Checking Calibrating the Recorder By selecting Source mode the 1077
15. vicing has been attempted by an unauthorised person 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
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