1010 User Manual - Time Electronics
Contents
1. Time Electronics 1010 DC Voltage Calibrator Technical Manual V1 1 20 04 09 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 Contents 1 A dean vsauannsadenrsansevvovannieerees 3 1 1 General Descriptlon icomicinesocicicnionasiocarceconicina retail 3 122 Specifications ci diia 3 3 eLo T A Un Hasan nar coenuetzeaceaetn testo cochaets iento 4 TA ClIrCUIEDEOSCHA DION A A A a ti dana 4 1 5 APpliCa ON ii 4 Le OPA rasa 5 2 1 Operating Procedure iii aia 5 211 Operating Position toa 5 241 2 O tp t terminals eea ana aa Dead i A rota bad 5 2A CASS temna eenean E E AEA E jade OAS 5 2 2 Front Panel COMUOIS cido ica 5 22201 A A note ite Hehe atin eat Ae Rae en ate ale tae aed 5 22 28 Output polar sey eet ae ee ea ite a heat ei 5 2 273 Battery lO ia i tarts 5 2 24s Output voltagesrangeis iii A ae eat ee 5 2 20 QUIPU level nai E E dada ee E a a caste teee 5 2 3 QUIPutnolSe contada dida 6 2 4 Common Mod NOISE icoosonnccnon inn ansann niaaa anaoa aniano aa oaan AER ERA 6 2 5 Thermal emis ina io nia renkan aE AKE AEEA EA Ekan REAA AANEEN ees 6 PA e E o E E E E E AEE TETEE 6 27 Mams Power UA ano a ra Aaaa chee dese esd ces SARLA ndan R Ehana EPROP LARS ARARA RER RRORE 7 Ar OE E PU E A EE A EEIE P VEE TEE E EEE T 7 2 7 2 Constructional details PU22. of setting 2 uV for the 10v 1v and 100mV ranges over the frequency range 0 10 Hz and less than 0 2uV 0 10 Hz for the lower ranges Lower noise levels can be obtained by connecting a low pass filter on the output terminals 2 4 Common mode noise Additional noise and variation of the output voltage can be caused by large common mode voltages These occur when the 1010 is used to calibrate or measure any input which is above ground potential or has an a c component with respect to ground When battery powered the 1010 has inherently a very high d c common mode rejection but it is not recommended that 100V d c common mode be exceeded The a c common mode rejection is determined by the capacitive unbalance to ground of the output terminals and associated connections The 1010 is checked before despatch with 30 Vp p 50 Hz common mode voltage on the output terminals 2 5 Thermal emfs When the 1010 is used to provide precision voltages of less than about 1 mV care must be exercised to avoid errors due to thermal emfs These occur where temperature differences are present at the junctions of dissimilar metals e g a normal solder to copper junctions has a thermal emf of approximately 3 uV C Errors inside the 1010 under temperature stable conditions are typically less than 0 2uV 2 6 Fuses The power supply and output fuses are mounted on the INSIDE of the front panel printed circuit board Access is by removing the ins
3. ranges The attenuation factor is 1000 1 The calibration of the attenuator is via the 10mV range trimmer VR3 Maximum range of adjustment is 0 16 The Attenuator is set up when the 1010 is manufactured and normally requires no further adjustment If however any of R2 R5 have been damaged by overload they will require replacing with equivalent types After replacing the resistors recalibration may be necessary beyond the range of the 10mV trimmer The 1010 output should be checked against a 9 9999mV output from the standard and adjusting resistors either R6 or R7 selected to bring the calibration within range of adjustment of the trimmer which can then be adjusted for the final calibration as described above The calibration should be done on the 9 9999mV range and due account taken of any thermal emf s generated in soldering the adjustment resistor in position Note It is important to ensure that the zero and calibration have been set before commencing 3 2 1 The specification allowances for these ranges are as follows 9 9999mV range 5 75uV 999 99uV range 0 75uV 1010 Technical Manual 11 12 5 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 Ele
4. ctronics 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 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
5. echnical Manual 10 4 3 Calibration Procedure 1 Ensure zero has been set as in 3 2 1 2 Connect power supply 3 Select 999 99mV range normal output polarity and output digits to 99999 4 Connect a suitable accuracy voltage standard with microvolt null meter to the output terminals The voltage standard should have 0 005 accuracy or better and ranges from 10mV to 10V f s The null meter should have a resolution of better than 1uV and preferably have calibrated ranges A high performance D V M can be used for calibrating Note It is possible to calibrate against another 1010 but the inaccuracies in that unit if known need to be taken into account 6 Adjust the CAL trimmer on the module for better than 50uV null balance against an output of 999 99mV from the standard Note that the maximum range of adjustment of this trimmer is 0 3 7 Select 9 9999V range and adjust the 10V range trimmer VR4 for less than 500uV null balance against an output of 9 9999V from the standard Maximum range of adjustment of this trimmer is 0 08 8 Select 99 999mV range and adjust the 100mV range trimmer VR5 for less than 5uV null balance against an output of 99 999mV from the standard 9 The specification allowances for these 3 ranges are as follows 9 9999V range 2 5mV 999 99mV range 250 uV 99 999mV range 55uV 4 4 10mV and 1mV Range Calibration The two ranges are obtained by resistive attenuation of the 10V and 1V
6. he 16 pin plug and socket Note It is important not to overstress the plug and socket since poor connection will result 7 Adjust the position of the module above the p c b with 6 nuts on the module side of the p c b When the module is parallel the plug and socket just closed the nuts on the opposite side of the p c b can be tightened It is important to ensure that no strain is put on the connector when the nuts are finally tightened 8 Set Module zero and recalibrate as described on the following page 1010 Technical Manual 8 4 Recalibration This is performed with the panel and p c b outside the case Please see Fig 1 for trimmer layouts 4 1 Zero The F E T chopper amplifier zero must be set before calibration can be done The zero is set when the instrument is manufactured and under normal operation will not require readjustment If a new circuit module is fitted or readjustment is found necessary the following procedure should be adopted 1 Connect power supply 2 Select 99 999mV range 3 Set all digits to zero 4 Set output polarity to normal 5 Connect a null meter to output terminals The meter sensitivity should be 100uV f s d with a resolution of better than 10uV It is possible to use the Time Electronics 1007 for this purpose although any micro volt null meter or sensitive D V M may be used 6 Adjust the zero trimming pot on the module for less than 10uV reading on the meter The ze
7. ons correctly 1 5 Applications The uses of the instrument include the calibration applications of conventional voltage potentiometers A 1010 in these applications has the advantage of requiring no standardisation and being able to supply much higher output currents without loss of accuracy Long term stability is inherent since standardisation is not required Other applications as a precision voltage source include calibration linearity and gain stability measurements etc on D C amplifiers digital and electronic voltmeters transducers and as a variable low current power supply or backing off voltage The 10 ppm HR stability and low noise levels are of particular interest when an extremely stable voltage is required rather than a high accuracy calibration source 1010 Technical Manual 4 2 Operation 2 1 Operating Procedure Operation of the 1010 is self explanatory from the front panel controls and specification Normal precautions concerning overload and incorrect range etc should be observed Battery condition should be checked on the front panel display before and during use For quick zeroing of output set the Polarity switch to OFF This applies a short on the output terminals 2 1 1 Operating Position Unlike many potentiometers and devices incorporating Standard Cells the 1010 DOES NOT require operation or transportation in a particular position 2 1 2 Output terminals The selected output voltage i
8. oooooonnoccccnnnccccnnnocccnnononnnnnononncnnnno nn nnnnnn nn tn annn nn annn nn nr rnnnnn nn 7 2 7 3 240V to 110V CONVEeESION coococccccccccnnonononccnncnncnnnnononnnnnnnnennnnn nn nn pandan anana di piara iaaiiai atai 7 3 Constructional Layout Details coonnonnnncccnnncccnnnnnononacononcncnonanannannnnnoos 8 3 1 Chopper amplifier module ccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeaeeeeeeeeeeeeeeeeeeeeeneeeeeeeeeeeeeees 8 8 lites Descrip sta clades aiden nbd eae tb Anaad ato eet ee ave 8 3 1 2 Module replaced iii ii el 8 4 Recalibration on AS 9 a O aa 9 4 2 Full Scale ii alaica aan 9 4 3 Calibration Procedure ii e eee ees 11 4 4 10mV and 1mV Range Calibration cccccccscesseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneeeeeneees 11 5 Guarantee amp Servicing c sicscscscsccscscicacscssencncaszeasacssieasscnsnensaansnensnaadnensnessseaenensaeds 12 All Time Electronics instruments are subject to continuous development and improvement and in consequence may incorporate minor detail changes from the information contained herein 1010 Technical Manual 2 1 Introduction 1 1 General Description The 1010 is an accurate battery mains powered voltage calibrator sourcing up to 10 volts in 5 ranges with a resolution up to 0 01uV A precision zener reference diode is used as a basic reference source and low temperature coefficient resistors are used Power is provided by a mains rechargeable battery
9. pm hr at constant temperature Positive or negative switch selected A centre off position on this switch provides a short circuit on the output for 1010 voltage source 10 1 8 0 1V ranges less than 10 ppm of setting 2uV 0 10 Hz 10mV 8 1mV ranges less than 0 05uV 0 10 Hz 20 x 160 x 190 mm Approximately 3 3kg 1010 Technical Manual 1 3 Power Unit The 1010 is supplied with a mains battery power unit This can be configured when ordered for either 115V or 230V AC 50 60Hz See section 2 7 3 1 4 Circuit Description The calibrator employs a temperature compensated zener diode as the basic reference source This provides the input to a FET chopper amplifier system which operates in a feed back stabilised mode and has a gain value determined by a set of precision metal film resistors which are selected by a 5 decade thumbwheel switch The output voltage is variable from 0 to 9 9999 volts in 5 ranges An output resistance of typically 0 05 ohms is maintained on the top three ranges the maximum output current that can be drawn on these ranges is automatically limited to 30mA This is to prevent damage to the circuitry in the event of accidental short circuit etc The lower ranges have an output resistance of 1 ohm and will supply current up to the short circuit value To ensure complete reliability the range switch employs two contacts in parallel for each position even if a contact fails the 1010 still functi
10. power unit A front panel indicator monitors the battery condition The completely solid state circuit design provides automatic standardisation against the internal reference and allows up to 30mA output current with less than 0 1 ohms output resistance Short circuit overload protection and a normal off reverse switch are provided 1 2 Specifications Ranges 0 9 9999V in 5 ranges Accuracy Setting Resolution Output Resistance Maximum Output Current Maximum Overload Output Voltage Stability Output Polarity Output Noise Level Dimensions Weight 0 9 9999V in 100uV steps 0 999 99mV in 10uV steps 0 99 999mV in 1uV steps 0 9 9999mV in 0 1uV steps 0 999 99uV in 0 01uV steps 10V 8 1V ranges 0 02 of setting 0 005 of range 100mV range 0 05 of setting 0 005 of range 1uV 10mV 8 1mV Ranges 0 05 of setting 0 005 of range 4uV 5 digits Less than 0 1 ohm type 0 05 ohm on 10V 1V and 0 1V ranges 1 ohm on lower ranges 25mA max on 10V 1V 8 0 1V ranges an internal short circuit current limit is set at approx 30mA Lower ranges can be loaded up to the short circuit current value although it should be noted that loads less than 1000 ohms will give greater than 0 1 error The instrument can withstand a continuous short circuit on the output Less than 30 ppm C to 50 C Less than 20 ppm V variation in supply voltage Less than 75 ppm year not cumulative Less than 10 p
11. ro trimmer is marked on the module label 7 Check the zero reading for the other 4 ranges The readings should be as follows 999 99uV range less than 0 25uV 9 9999mV ranges less than 0 75uV 999 99mV ranges less than 40uV 9 9999V ranges less than 100uV 4 2 Full Scale Fine adjustment of the 1010 output voltage is provided by 4 trimmers One is located on the module is marked CAL and provides equal adjustment of the output voltage for ranges The other 3 trimmers are locates on the front panel p c b and provide individual adjustment for the 10V 100mV and 10mV ranges Since a common attenuator is used for the 10mV and 1mV ranges the 1mV range is automatically calibrated when the 10mV range is calibrated All the trimmers are set up when the instrument is manufactured and normally will not need readjustment If a new circuit module is fitted or readjustment found to be necessary the procedure below should be adopted It is important to note that the maximum range of adjustment provides about 0 2 variation in the output voltage If errors of greater than this magnitude are occurring there is no point in attempting to recalibrate using the trimmers and a fault condition will be occurring somewhere in the unit 1010 Technical Manual 9 10 Fig 1 1010 Trimmer Layouts MODULE FIXING HOLE 10m VW CAL 10V CAL e 100m Y CAL Module Component side Regulator P2 CONNECTORS 1010 T
12. s The output connectors and output fuse are located outside the cover The cover is fixed to the rear panel by a 4 screws Later versions of PU2 have a 20mm F500mA fuse located inside cover Important Note Take care when checking and dismantling a PU2 Even though disconnected from the mains there is still sufficient power stored in the rechargeable battery to cause catastrophic damage to the electronic circuitry if inadvertent short circuits occur These can easily occur when the metal cover is being removed 2 7 3 240V to 110V conversion The PU2 mains transformer has tappings for 240V or 110V AC mains The following procedure should be adopted to convert from 240V to 110V 1 Remove mains power unit from 1010 2 Remove P C B metal screening cover Note Take care not to short any part of the circuitry when converting a PU2 3 Connect mains transformer windings in parallel by rewiring the mains input to the transformer As shown on the side of the transformer 4 Replace the screening cover 1010 Technical Manual 7 8 3 Constructional Layout Details The complete instrument assembly except the Power Unit is mounted on the front panel A printed circuit board which carries the components and range switch is located immediately behind the front panel The panel and p c b can be removed as follows 1 Remove Power Unit located in instrument rear by 4 screws 2 Disconnect supply connected to power unit by 2 pres
13. s connected to the front panel safety terminal binding posts which are suitable for normal wire compression connection or by 4mm plug insertion 2 1 3 Case terminal The case terminal is connected only to the instrument case and is isolated from the circuitry The case provides an overall electrostatic screen for the 1010 and can be earthed as required to improve rejection of noise pick up 2 2 Front Panel Controls 2 2 1 Supply on off A miniature toggle switch interrupts the supply line to the circuit module Indication of supply on off is provided by the battery level indicator 2 2 2 Output polarity A change over toggle switch enables the output polarity to be reversed A centre position provides a short circuit on the 1010 output terminals 2 2 3 Battery level The battery level is continuously monitored on a front panel indicator which also serves as a supply on off indication A minimum mark indicates when the batteries need replacing or recharging 2 2 4 Output voltage range Selected by a 5 position rotary switch 2 2 5 Output level Selected on a 5 digit thumbwheel switch The resolution of setting is 0 01 of full scale 1010 Technical Manual 5 2 3 Output noise The electrical noise on the output voltage consists of chopper intermodulation thermal noise and random variations Thermal noise becomes more significant on the lower ranges see Thermal EMFS In general the total noise level is less than 20ppm
14. s stud connectors 3 Remove front panel locating screws 4 Withdraw front panel and p c b the power supply lead can also be withdrawn through a hole in the plastic power supply cover For recalibration the power supply can be connected without rehousing in the case 3 1 Chopper amplifier module 3 1 1 Description The module contains the F E T Chopper amplifier precision zener and associated circuitry It is a fully encapsulated module and connections are via a 16 pin connector moulded into it The modular form of the 1010 s basic circuitry protects it from damage due to adverse conditions and thermal gradients which could give rise to thermal emf errors A replacement procedure should be adopted in the case of failure or malfunctioning of the module see Section 3 1 2 3 1 2 Module replacement 1 Remove and disconnect power unit located in instrument rear by 4 screws 2 Remove front locating screws 3 Carefully withdraw the front panel and associated printed circuit board p c b The power supply lead can also be withdrawn through a hole in the plastic supply cover 4 Remove 4 nuts which locate the module on the p c b 5 Withdraw the module from the p c b 6 Remove 4 nuts remaining on module mounting studs Put these nuts on the new module Replace new module in reverse order ensuring the connector pins align correctly it may be necessary to bend slightly the mounting studs in order to obtain smooth alignment of t
15. 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 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 4 For more detailed information about disposal of your old appliance please contact i F your city office waste disposal service or return to Time Electronics 1010 Technical Manual 12
16. trument front panel as described in Section 3 Both are 20mm 250mA types Spare fuses can be obtained directly from Time Electronics Ltd from your local supplier or an authorised distributor 1010 Technical Manual 6 2 7 Mains Power Unit 2 7 1 Type PU2 The PU2 incorporates a rechargeable Nickel Cadmium battery and electronics charge control circuitry The circuitry is arranged to enable the PU2 to provide power directly from the mains if the mains input is connected or alternatively from the rechargeable battery if mains is not connected When the mains is connected the charging circuitry provides the correct charge current 40 45mA for the battery and automatically reduces this to a trickle rate 3 4mA when the battery is fully charged This means that it is impossible to overcharge the battery The DC performance is as follows With mains connected DC output 15 5 7V 0 100mA load With mains disconnected and battery fully charged DC 14 5 15 5V 0 100mA load Mains input range 110 250V AC 40 60 Hz IEC mains input fuse is 20mm F1A The capacity of the rechargeable battery is approximately 450mA Hrs This allows about 40 50 hrs continuous use of the 1010 To fully recharge the battery requires 14 16 hours with mains connected 2 7 2 Constructional details PU2 The P C B is located on the rear panel by 4 screws and is spaced off approx 10mm A metal cover protects and screens the P C B and component
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