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Summary of Contents for Time Electronics 1048
- Page 1 1048 Voltage / Current / Loop Calibrator Version 1.3 12-23 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 All rights reserved. Nothing from this manual may be multiplied, or made public in any form or manner, either electronically or hard copy, without prior written consent from Time Electronics Ltd. This also applies to any schematics, drawings and diagrams contained herein.
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Page 3: Table Of Contents
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Contents Introduction ............................ 2 Description ............................. 2 Applications ............................3 Features ..............................4 Ordering Information and Options ......................4 Specifications ..........................5 Technical Specifications ........................5 Settings and General Specifications ...................... 6 Controls and Operating Modes .................... -
Page 4: Introduction
In the source mode, voltage up to 22 V and current up to 22 mA may be generated in three ranges. When in current source mode the 1048 has a high 24 V compliance voltage which is ideal for powering process loops. In the measurement mode, the range and function can be easily selected, with the measured input accurately shown on the display. -
Page 5: Applications
Common use of the 1048 is to simulate a transducer or measure the current flow in a transducer loop. The 1048 can be used to check a 4 to 20 mA system in either source or measure modes of operation, with the 24 V compliance voltage powering the loop when current source mode is selected. -
Page 6: Features
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Features Measure voltage and current • 3 source ranges: 0 to 22 mA and 0 to 22 V • 3 measure ranges: 0 to 70 mA and 0 to 50 V •... -
Page 7: Specifications
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Specifications Technical Specifications Voltage source Output Range Resolution Accuracy Temp coefficient current 0 to 220 mV 10 μV, 100 μV above 0.2 V 0.05 % of FS 0 to 2.2 V 100 μV, 1 mV above 2 V... -
Page 8: Settings And General Specifications
Alternatively, an optional 12 V power supply can be plugged into the 2.5 mm socket on the top of the unit. Protection ......The 1048 can withstand open circuits, short circuits and reverse polarity up to 25 V. Additional protection is by an internal fuse. -
Page 9: Controls And Operating Modes
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Controls and Operating Modes Front Panel Controls Input/Output Terminals Safety terminals for 4 mm shrouded plugs, standard plugs, bare wires, spade terminals. Display 4.5 Digit LCD display of output and measure. -
Page 10: Operating Modes
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Operating Modes The 1048 has 3 operating modes; Normal, Step, and Ramp. 3.2.1 NORMAL Operating Mode Provides manual operation of the standard measure and source functions for both voltage and current. -
Page 11: Operating Notes
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Operating Notes Power The unit is powered by a PP3 (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’... -
Page 12: Resolution Adjustment
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Resolution Adjustment 4.3.1 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. -
Page 13: Polarity Setting
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Polarity Setting 4.4.1 Output Polarity Switch It is important for the user to understand the operation of the output polarity switch. The switch has three positions, NORM / OFF / REV, and its function depends on the operating mode being used. -
Page 14: Normal Operation
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Normal Operation Voltage Measurement The unit measures dc voltage in three selectable ranges, 0 to 0.22 V (displayed in mV), 0 to 2.2 V and 0 to 22 V (plus over-range to 50 V). -
Page 15: Current Measurement (External Loop Power)
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Current Measurement (external loop power) The unit measures current in three selectable ranges, 0 to 0.22 mA (displayed in μA), 0 to 2.2 mA and 0 to 22 mA (plus over-range to 70 mA). -
Page 16: Power And Calibrate - Transmitters/Sensors
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Power and Calibrate - transmitters/sensors If the external loop power supply is not available, it is possible to use the unit’s internal 22 V supply to power the loop. Set up the unit as described below. -
Page 17: Voltage Source
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Voltage Source The unit outputs voltage from 0 to 22 V in three ranges: 0 to 0.22 V (displayed in mV) 0 to 2.2 V 0 to 22 V ... -
Page 18: Current Source
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Current Source The unit outputs current from 0 to 22 mA in three ranges: 0 to 0.22 mA (displayed in μA) 0 to 2.2 A 0 to 22 A ... -
Page 19: Sink - Transmitter Simulator (Tx Sim)
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual 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 the value shown on the unit’s display. -
Page 20: Step And Ramp Operation
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Step and Ramp Operation 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. -
Page 21: Step Mode
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Step Mode 6.1.1 Manual STEP Operation This mode 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 mA, 11 points in 0 –... - Page 22 Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual 6.1.2 Automatic STEP Operation This function provides a method of automatically stepping through the fixed output values. Set function switch to SRC • Set OFF/V/mA switch to the desired units (V or mA) •...
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Page 23: Ramp Mode
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Ramp Mode 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. -
Page 24: Maintenance And Calibration
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Maintenance and Calibration Power Supplies 7.1.1 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. -
Page 25: Disassembling The Unit
User Manual Disassembling the unit For disassembly follow the steps below. Note that the 1048 and 1044 have the same method. 1. 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. - Page 26 Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual 4. 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. 5. Gently press on the shaft of the multi-turn control to release the printed circuit assembly and battery from the case.
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Page 27: Trimmer Locations
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Trimmer Locations... -
Page 28: Re-Calibration
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Re-Calibration 7.4.1 Calibration equipment required: A precision DC voltage calibrator with an accuracy of 0.01% or better. • A multimeter with accuracy of 0.01% or better. • 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 (.22 V) which has a setting resolution of 10 μ... - Page 29 Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual 7.4.3 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’...
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Page 30: Reassembling The Unit
Time Electronics 1048 Voltage / Current / Loop Calibrator User Manual Reassembling the Unit Reassemble the unit in the reverse order as in 5) through to 1) in section 7.2. Note that care must be taken when returning the printed circuit board assembly to its correct position in the case. -
Page 31: Warranty And Servicing
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. - Page 32 User Manual Returning Instruments Prior to returning your product please contact Time Electronics. We will issue a return merchandise authorization (RMA) number that is to accompany the goods returning. Further instructions will also be issued prior to shipment. When returning instruments, please ensure that they have been adequately packed, preferably in the original packing supplied.
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