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MA 400
Bedienungsanleitung
Operating Instructions
Notice d'utilisation

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Summary of Contents for Ecom MA 400

  • Page 1 MA 400 Bedienungsanleitung Operating Instructions Notice d‘utilisation...
  • Page 2: Table Of Contents

    Table of Contents 1. Introduction 1.1 Repairs 1. Safety Information . Overview 3. Getting Started 3.1. Battery Save Feature 3. HART™ Resistor Setup 4. Basic Operating Modes 4.1 Milliamp Source 4. Milliamp Simulation 4.3 Milliamp Measure 4.4 Milliamp Measure with Loop Power 4.5 Voltage Measure 5. Advanced Operating Modes 5.1 Auto Step/Ramp Mode 5.. P ercent Error Mode 5.3 Min/Max Datalogging 6. Maintenance 6.1 Battery Selection 6. Input Protection 6.3 Calibration 7. Specifications 8. Warranty and liability...
  • Page 3: Introduction

    1. Introduction The MA 400 is designed to be a complete 4 to 0mA current calibrator for both troubleshooting and calibrating current loops. Very high accuracy combined with several unique features makes the MA 400 an easy to use and highly flexible calibration tool. The MA 400 can source, simulate (-wire) or measure loop currents up to 4mA. It can also measure process signal voltages up to 8VDC with the same 0.015% of reading accuracy. A digital knob user interface combined with decade output control allows the user to make both large or small output changes with ease. Several unique functions such as the autostep/ramp modes allow the MA 400 to test valve actuators for smoothness and proper operation. The MA 400 can also power two-wire transmitters while simultaneously reading the resultant loop current. All readings are displayed in both milliamps and % of span. 1.1 Repairs Repair work is subject to the nationally valid regulations and directives. We therefore recommend that such work be performed by ecom instruments GmbH, Germany, as all repairs must be examined to ensure functional safety. 1.2 Safety information These operating instructions contain information and safety regulations that must be followed to ensure safe and reliable operation of the unit under the described conditions. Failure to follow the information and instructions can have dangerous consequences or may contravene applicable regulations. Please take the time to carefully read through the owner’s manual before you start using the unit. In the event of any doubt or discrepancies (e.g. due to translation or printing errors), the German version of these operating instructions shall govern. Symbols Used The following table lists the International Electrical Symbols. Some or all of these symbols may be used on the instrument or in this manual. Symbol Description AC (Alternating Current) AC-DC...
  • Page 4 Battery CE Complies with European Union Directives Double Insulated Electric Shock Fuse PE Ground Hot Surface (Burn Hazard) Read the User’s Manual (Important Information) Canadian Standards Association The following definitions apply to the terms “Warning” and “Caution”. - “Warning” identifies conditions and actions that may pose hazards to the user. - “Caution” identifies conditions and actions that may damage the instrument being used. Use the calibrator only as specified in this manual, otherwise injury and damage to the calibrator may occur.
  • Page 5 Warning To avoid possible electric shock or personal injury: - Do not apply more than the rated voltage. See specifications for supported ranges. - Follow all equipment safety procedures. - Do not use the calibrator if it is damaged. Before you use the calibrator, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors. - Select the proper function and range for your measurement. - Make sure the battery cover is closed and latched before you operate the calibrator. - Remove test leads from the calibrator before you open the battery door. - Inspect the test leads for damaged insulation or exposed metal. - When using the probes, keep your fingers away from the probe contacts. Keep your fingers behind the finger guards on the test leads. - Do not use the calibrator if it operates abnormally. Protection may be impaired. When in doubt, have the calibrator serviced. - Do not operate the calibrator around explosive gas, vapor, or dust. - Disconnect test leads before changing to another measure or source function. - When servicing the calibrator, use only specified replacement parts. - To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears. Caution To avoid possible damage to calibrator or to equipment under test: - Use the proper jacks, function, and range for your measurement or sourcing application.
  • Page 6: Overview

    2. Overview 20mA = 100% Figure 1 3. Getting Started 3.1 Battery Save Feature After unpacking the MA 400, it should be ready for use. A 9 volt alkaline battery comes preinstalled. The “Battery Save” feature is enabled and set to 30 minutes in case the unit is accidentally turned on in transit. The battery save feature will turn off the MA 400 automatically if no keys are pressed after 30 minutes. To change the length of time on the battery save feature or to disable it completely perform the following steps during power up: 1) Turn off the MA 400. ) Hold the key down firmly. 3) T urn on the MA 400. 4) After power up, wait about 1 second and release the key. 5) The display will now indicate the amount of time the battery save feature is set for (off to 30 minutes). 6) Using the knob, set the desired time (off to 30 minutes). 7) Press again to store the value and return the unit to normal mode. The stored value will remain in memory until changed by the operator.
  • Page 7: Hart™ Resistor Setup

    3.2 HART ™ Resistor Setup The MA 400 incorporates an internal 50 ohm resistor to facilitate using a Rosemount 75 Communicator during calibration or installation of HART™ transmitters. The internal resistor takes the place of the 50 ohm resistor normally installed during the use of the model 75 Communicator. An internal jumper can be removed to enable this feature if desired. The unit is shipped with the jumper in place. To remove the jumper open the case and refer to Figure  to locate the jumper, then pull off the jumper to enable the resistor. The jumper can be stored outside of the unit or re-installed only on one pin so that the circuit remains open. -J8 (HART™ JUMPER) Remove Jumper to Enable HART™ 50 Ohm Resistor Figure 2 Note: When the 50 ohm resistor is enabled the load driving capability is reduced from 100 ohms to 950 ohms. In most cases this should not be a problem when calibrating Non-HART™ compatible products. 4. Basic Operating Modes The MA 400 offers 4 modes of milliamp operation and one voltage measure mode. The following text and figures explain the various operating modes:...
  • Page 8: Milliamp Source

    4.1 Milliamp Source Figure 3 shows a typical application where the MA 400 is sourcing 4 to 0 mA into a device under test. Figure 3 - Sourcing 4 to 20 mA 1) Turn on the MA 400. It will default to the mA source mode. ) Connect the device to be calibrated. Note: The loop must be closed for the MA 400 to source current. If an open loop occurs “OL” will flash on the LCD indicating an overload or open condition. 3) The output can be adjusted to the desired value by using the knob interface and selecting the decade to be adjusted. 4) The output can also be stepped in 4 mA steps (5%) using the key. 5) The auto step feature provides automated output changes. Refer to the Auto Modes Section (5.1) of the manual for more information.
  • Page 9: Milliamp Simulation

    4.2 Milliamp Simulation Figure 4 shows how to connect the MA 400 to act as a two-wire transmitter using an external power supply. In this application the power for the loop comes from the external supply and the MA 400 simply controls the current flow through the loop. The procedure for controlling the output is the same as the milliamp source. Figure 4 - Simulating 4 to 20 mA...
  • Page 10: Milliamp Measure

    4.3 Milliamp Measure Figure 5 shows how to connect the MA 400 to measure a 4-0 mA loop. In this application the MA 400 is simply reading the loop current and displaying the current in mA on the main display. The lower (smaller) display area is showing percentage relative to a 4 to 0 mA span. 4.4 Milliamp Measure with Loop Power Again, Figure 5 shows the proper connections. But in this case the device under test is a twowire transmitter that requires an external power supply to generate an output current. In this application the MA 400 will supply 4 volts to the loop while simultaneously measuring the resultant loop current. To turn on the loop power supply press the key while in the mA measure mode. Figure 5 - Measuring 4 to 20 mA NOTE: The loop power mode can only be enabled while in the mA measure mode.
  • Page 11: Voltage Measure

    4.5 Voltage Measure Figure 6 shows how to connect the MA 400 to measure DC voltage up to 8 volts. To activate the volts measure function simply press the key to toggle through the functions until the volts measure mode is reached. The input impedance of the MA 400 ≥1 meg ohm while in this mode. Figure 6 - Measuring 0 to 28 VDC 5. Advanced Operating Modes 5.1 Auto Step/Ramp Mode The MA 400 has the ability to step the mA output in 5% steps automatically in 5 second intervals. It can also ramp the mA output from 4 mA to 0 mA then back to 4 mA in a linear fashion automatically. To activate the Auto-Step/Ramp mode use the following procedure: 1) The Auto Step/Ramp function can be used in either the source mA or simulate mA mode. Place the MA 400 in one or the other mode. ) Connect the MA 400 to the device under test. 3) Press the key once for the step mode, twice for the slow ramp mode and three times for the fast ramp mode. With each press a small annunciator will appear on the lower left side of the LCD indicating which one of the step/ramp modes has been selected. 4) Once enabled the step/ramp mode will run continuously until another key is pressed.
  • Page 12: Percent Error Mode

    5.2 Percent Error Mode This unique feature will calculate error as a percentage of span (4 mA to 0 mA yields a 16 mA span). The percent error feature allows the user to “Zero Out” the %mA display so that the deviation from the ideal value can be displayed on the % error display. The procedure is as follows: 1) Connect the MA 400 to the unit under test. ) Place the MA 400 in one of the mA output modes (source or simulate). 3) Adjust the MA 400 to the desired output. 4) If the unit under test does not read exactly as it should, hold down the key and adjust the knob unit until the unit under test reads correctly. Continue to hold down the key. 5) The reading in the % display area will be the error or deviation calculated as a percentage of span. 6) When the key is released the % display will return to normal operation. 5.3 Min/Max Datalogging When the MA 400 is in any of the measure modes (mA, mA w/loop power or voltage) it will continuously monitor and store the minimum and maximum values for that particular input mode. To operate the datalogging feature use the following procedure: 1) Place the MA 400 in one of the measure modes. ) Connect the MA 400 to the unit under test. 3) Clear the min/max memory by pressing both keys (min and max) simultaneously. The LCD will display “CLR” when the memory is cleared. 4) Allow the unit to log min. and max. for as long as required. Note: You may want to disable the Battery Save feature before using the Dataloggiong Mode to prevent the MA 400 from turning off prematurely. 5) At any time press the min. or max. to display the value stored. 6) Turning off the MA 400 or changing modes will clear the memory. Be sure to record your data before turning off the unit. 6. Maintenance 6.1 Battery Selection The MA 400 operates on a standard 9V alkaline battery or an optional rechargeable 9V Ni-Cd battery. For most applications the 9V alkaline battery will suffice; however, in heavy use applications the 9V Ni-Cd may be a better choice. The 9V Ni-Cd battery supplied by Martel will offer approximately 3 hours of continuous use at 1 mA output on a full charge (the alkaline battery will yield about 1 hours). The charger supplied by Martel will provide an overnight charge rate (10-1 hours) and will also power the MA 400 for bench use while maintaining a loat charge on the Ni-Cd battery.
  • Page 13: Specifications 6

    7. Specifications Input Range mA: 0.000 to 4.000 mA –5.00% to 15.00% Output Range mA 0.000 to 4.000 mA Source/Simulate: –5.00% to 15.00% Read VDC: 0 to 30 VDC Accuracy: ±0.015% of reading ± counts Resolution: 0.001 mA; 0.001 volts Loop Supply Voltage: 4 VDC Typical Drive Capability: 100 Ω w/o HART™ 950 Ω with HART™ Auto % Error Function: Selectable Decade Adjustment: Auto Step/Ramp: Preset Outputs: Loop Power Measure Capability: Operating Temperature: –10°C to 55°C Power Supply: 9V Battery Rechargeable Battery Option: Yes, optional available AC Adapter: Yes, optional available Size: 5.7 x 3.15 x 1.43 in (145 x 80 x 37 mm) Weight: 1 oz. (340 g)
  • Page 14: Warranty And Liability

    8. Warranty and liability Under the general terms and conditions of business, ecom instruments GmbH offers a -year warranty for function and materials on this product under the specified operating and maintenance conditions. Not covered are all wearing parts (e.g. batteries, sensors, displays, lamps, etc.) as well as calibrations. This warranty does not extend to products that have been used improperly, altered, neglected, dama- ged by accident or subjected to abnormal operating conditions or improper handling. In the event of a warranty claim, the faulty device should be sent in. We reserve the right to readjust, repair or replace the unit. The above warranty terms represent the sole rights of the purchaser to compensation and apply exclu- sively and in place of all other contractual or statutory warranty obligations. ecom instruments GmbH does not accept liability for specific, direct, indirect, incidental or consequential damages or losses, including the loss of data, regardless of whether they are caused by breach of warranty, lawful or unlawful actions, actions in good faith or other actions. If in certain countries the restriction of statutory warranty and the exclusion or restriction of incidental or consequential damages is unlawful, then it may be possible that the above restrictions and exclusi- ons do not apply for all purchasers. If any clause in these warranty terms should be found to be invalid or unenforceable by a competent court, then such a judgement shall not affect the validity or enforcea- bility of any other clause contained in these warranty terms.
  • Page 15 GmbH Industriestraße 2 97959 Assamstadt / Germany Tel.: +49 (0) 62 94 / 42 24 0 Fax: +49 (0) 62 94 / 42 24 90 E-Mail: sales@ecom-ex.com Internet: www.ecom-ex.com...

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