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Table of Contents
Related Manuals for Tequipment 7005
Summary of Contents for Tequipment 7005
- Page 1 7005 Loop Calibrator Technical Manual...
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Page 2: Table Of Contents
Contents Introduction …………………………………….. 2 Operation ............3 Front panel controls ........3 2.2a Current loop connections ......4 2.2b Voltage loop connections ......5 On/Off control ........... 6 Selecting Source or Measure mode ..6 Selecting Current or Voltage ..... 6 Source Mode .......... -
Page 3: Introduction
Introduction The 7005 is a micro-processor based instrument for the calibration of voltage and current loop signals. It can operate in three modes, Loop current/voltage source (simulating a transmitter and the loop supply) Sink of loop current (simulating a transmitter) Measurement of loop current/voltage (simulating a loop indicator). -
Page 4: Operation
2.1 Front panel controls Press and hold for power ON and OFF Selects one of the Short press for following 5 ranges, User Setup User programmed 4 - 20 mA 0 - 20 mA Sqrt 4 - 20mA Sqrt 0 - 20mA Press to toggle When in Source between Measure... -
Page 5: Current Loop Connections
10.00mA — — Measure: Unit supplying loop power while measuring loop current Transmitter Pressure — Measure: Unit measuring loop current, loop power external Pressure Transmitter 24V Loop power supply — — 7005 measuring loop current. Loop power from external supply. -
Page 6: Voltage Loop Connections
2.2b VOLTAGE loop connections: Source: Unit setting loop voltage Loop voltage indicator 5.00V — Measure: Unit measuring loop voltage. Pressure Transmitter —... -
Page 7: On/Off Control
2.3 ON/OFF Control • To turn the unit ON, press and hold down the ON/OFF button until the display powers up. • To turn the unit OFF, press and hold down the ON/OFF button until the display blanks. 2.4 Selecting Source or Measure Mode •... -
Page 8: Source Mode
2.6 Source mode The unit can be operated as either a current source or a voltage source. When calibrating current loops, the internal 24V power supply may be used to provide the drive voltage. Alternatively, when the loop is externally powered, the unit provides a sink function. -
Page 9: Current Source
2.6a Current source Selection of range • Switch the unit on. • Ensure unit is in a mA range, see chapter 2.5. • Select Source mode, see chapter 2.4. • Press the ‘Range’ button to step though the available ranges, 4 to 20mA 0 to 20mA sqrt 4 to 20mA... -
Page 10: Voltage Source
2.6b Voltage source The unit can operate as a voltage source up to a maximum of 21V at 20mA. Connection is made via the COM and V+ terminal. Please note that these are the same terminals used for voltage measurement and it is therefore recommended that all leads are disconnected when changing from Source to Measure mode. -
Page 11: Output Control
2.6c Output Control The unit provides three methods of controlling the output, 1) Manual step, 2) Auto-step, or 3) Ramp. 2.6d MANUAL STEP Provides manual control of the five preset calibration point 0%, 25%, 50%, 75% or 100% of span. The output can also be fine adjusted (inched) to provide an indication of the deviation from the calibration point. -
Page 12: Auto-Step
2.6e AUTO-STEP Provides automatic stepping with a programmable dwell period between each steps. • Switch the unit on • Ensure the unit is in Source mode (current or Voltage) as required (see chapter 2.4 and 2.5) • Select range as required (see chapter 2.6a/b) •... -
Page 13: Ramp
2.6f RAMP Provides a continuous ramp, with a programmable dwell period at the top and bottom. • Switch the unit on • Ensure the unit in current or voltage source as required, see chapter 2.4 and 2.5 • Select range as required, see chapter 2.6a/b •... -
Page 14: Output Errors
2.6g Output errors When the unit is unable to provide the desired output due to output error conditions, the display will show up arrows in place of the digits. Desired value Output error conditions are typically, Loop resistance too large (current source) Loop resistance too small (voltage source) External loop supply voltage too low (current sink) -
Page 15: Measure Mode
2.7 Measure Mode When in measure mode, current or voltage is displayed in either mA, Volts, or %(of span). Additionally maximum and minimum readings can be displayed. Typical measure display Measured value (mA, V or %) Selected range Measure mode... -
Page 16: Current Measure
2.7a Current Measure The unit can measure current up to 125mA via the COM and mA terminals. For see chapter 2.2 for connection details. Selection of range • Switch the unit on • Select measure mode, see chapter 2.4 • Select a mA units, see chapter 2.5 •... -
Page 17: Voltage Measure
2.7b Voltage Measure The unit can measure voltage up to +/-25V. Auto-ranging allows full resolution (5 digits) for measurements lower then +/- 5V. • Switch the unit on • Select Measure mode, see chapter 2.4 • Select Volts units, see chapter 2.5 •... -
Page 18: User Setup
User setup The unit is fitted with non-volatile memory to store user set values. 3.1 Automatic power-down An automatic power-down feature is incorporated and turns the unit off after approximately 7 minutes if no buttons are pressed. If required the automatic power-down feature can be disabled. •... -
Page 19: User Programmable Range And Ramp
3.2 User programmable range and ramp • Switch the unit on. • Ensure the unit is in Source mode (current or voltage) as required (see chapter 2.4 and 2.5). Please note that the user settings stored in mA function is separate to the settings in Volts function. - Page 20 Currently selected digit Cursor • Once the digits have been changed to the desired value press the ‘V / mA’ button to store the setting. The display will then return to the first user setting (0%) • Select the next user setting and change as required. •...
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Page 21: Specification
Specification Source DC Current 0 to 50mA Accuracy ±0.01% setting ±2uA Resolution Max loop resistance 1100ohms@20mA Max drive voltage DC Volts 0 to 21V @ 20mA Accuracy ±0.01% setting ±4mV Resolution Min loop resistance 400 ohms Max drive current 50mA Output resistance <... - Page 22 Measure DC Current (Auto-ranging) 0 to ±25mA Accuracy ±0.01% reading ±2uA Resolution 25 to ±125mA Accuracy ±0.01% reading ±20uA Resolution 10uA Measure load 24.5Ohms all ranges DC Volts (Auto-ranging) 0 to ±5V Accuracy ±0.01% reading ±0.4mV Resolution 0.1mV 5 to ±25V Accuracy ±0.01% reading ±2mV Resolution...
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Page 23: Battery And Recharging
Battery and recharging The unit is powered by a internal rechargeable NiCad battery pack. To recharge the batteries, connect the supplied external battery charger to the unit via the 1.3mm socket located on the left hand case side. The battery charger should be set to 12V. Full battery recharge will take approximately 9 hours with the instrument switched off, and 11 hours with the instrument switched on. -
Page 24: Guarantee And Service
6. Guarantee & Service This instrument 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 repair under guarantee. We, at our discretion either repair or replace defective items.
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