Time Electronics 1010, User Manual

Page 1: ...ltage Calibrator Version 1 2 04 22 Time Electronics Ltd Unit 5 TON Business Park 2 8 Morley Road Tonbridge Kent TN9 1RA United Kingdom T 44 0 1732 355993 F 44 0 1732 350198 mail timeelectronics co uk www timeelectronics com ...

Page 2: ...e Electronics Ltd This also applies to any schematics drawings and diagrams contained herein This manual provides operating and safety instructions for the Time Electronics product To ensure correct operation and safety please follow the instructions in this manual Time Electronics reserves the right to change the contents specifications and other information contained in this manual without notic...

Page 3: ... 6 1 5 Applications 6 2 Operation 7 2 1 Front Panel Controls 7 2 2 Operating Procedure 8 2 3 Output noise 9 2 4 Common mode noise 9 2 5 Thermal emfs 9 2 6 Fuses main PCB 9 2 7 Mains Power Unit 10 3 Constructional Layout Details 12 3 1 Chopper amplifier module 12 4 Re calibration 14 4 1 Zero 14 4 2 Full Scale 14 4 3 Calibration Procedure 16 4 4 10mV and 1mV Range Calibration 17 5 Warranty and Servi...

Page 4: ...e Zener bipolar reference source this features a very low drift of 2ppm C max TC coupled with the use of low temperature coefficient resistors Power is provided by a mains rechargeable battery power unit A front panel indicator monitors the battery charge condition The circuit design provides automatic standardisation against the internal reference and allows up to 30mA output current with less th...

Page 5: ...anges an internal short circuit current 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 1kΩ will give greater than 0 1 error Maximum Overload The instrument can withstand a continuous short circuit on the output Output Voltage Less than 30 ppm C 0 to 50 C Stability Less than 5 ppm V variation in s...

Page 6: ... electronic 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 30mA see output resistance in specifications To ensure complete reliability of the switch bank each digit thumbwheel switch employs twin parallel gold plated contacts even if a contact fails the 1010 still functions correctly 1...

Page 7: ...tput polarity to be reversed A centre position provides a short circuit on the 1010 output terminals 3 Internal rechargeable battery level The battery level is continuously monitored on a front panel LED indicator which also serves as a supply on off indication When green the unit is powered on and battery level is good When red the batteries need recharging 4 Output voltage range Selected by a 5 ...

Page 8: ...hort circuit on the output terminals This can also be used for quick zeroing of output 2 2 1 Operating Position Unlike many potentiometers and devices incorporating standard cells the 1010 DOES NOT require operation or transportation in a particular position 2 2 2 Output terminals The selected output voltage is connected to the front panel safety terminal binding posts which are suitable for twist...

Page 9: ...herently a very high DC common mode rejection but it is not recommended that 100V DC common mode be exceeded The AC 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 30Vpp 50 Hz common mode voltage on the output terminals 2 5 Thermal emfs When the 1010 is used to provide precision vo...

Page 10: ... With mains disconnected and battery fully charged DC 15 5 14 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 600mAH 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 t...

Page 11: ...instrument from mains power remove rear IEC mains input connector 2 Remove 4 rear panel holding screws withdraw panel mains power unit from 1010 3 Remove PCB metal screening cover Note Take care not to short any part of the circuitry when converting a PU2 4 Connect mains transformer primary windings in parallel by removing the centre series link rewire the two mains input windings to the transform...

Page 12: ... and PCB 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 a precision LTC 5V reference device and associated circuitry It is a fully encapsulated module and connections are via a ...

Page 13: ...PCB 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 the 16 pin plug and socket Note It is important not to stress the plug and socket since poor connection will result 7 Adjust the position...

Page 14: ... 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 25µV 9 9999mV ranges less than 0 75µV 999 99mV ranges less than 40µV 9 9999V ranges less than 100µV 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 vo...

Page 15: ...Time Electronics User Manual 1010 DC Voltage Calibrator v1 2 1010 DC Voltage Calibrator Page 15 of 19 Fig 1 1010 Trimmer Layouts ...

Page 16: ...eferably have calibrated ranges A high performance D V M can be used for calibrating 5 Adjust the CAL trimmer on the module for better than 50µV null balance against an output of 999 99mV from the standard Note that the maximum range of adjustment of this trimmer is 0 3 6 Select 9 9999V range and adjust the 10V range trimmer VR4 for less than 500µV null balance against an output of 9 9999V from th...

Page 17: ...th 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 ...

Page 18: ...rom action of the user such as misuse operation outside of specification improper maintenance or repair or unauthorized modification Time Electronics total liability is limited to repair or replacement of the product Note that if Time Electronics determine that the fault on a returned product has been caused by the user we will contact the customer before proceeding with any repair Calibration and...

Page 19: ...charges paid to Time Electronics Ltd Unit 5 TON Business Park 2 8 Morley Road Tonbridge Kent TN9 1RA United Kingdom Tel 44 0 1732 355993 Fax 44 0 1732 350198 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 el...