Ecom MA 400 Manuel utilisateur
MA 400
Bedienungsanleitung
Operating Instructions
Notice d‘utilisation
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Table of Contents
1. Introduction 16
1.1 Repairs 16
1.2 Safety Information 16
2. Overview 19
3. Getting Started 19
3.1. Battery Save Feature 19
3.2 HART™ Resistor Setup 20
4. Basic Operating Modes 20
4.1 Milliamp Source 21
4.2 Milliamp Simulation 22
4.3 Milliamp Measure 23
4.4 Milliamp Measure with Loop Power 23
4.5 Voltage Measure 24
5. Advanced Operating Modes 24
5.1 Auto Step/Ramp Mode 24
5.2. Percent Error Mode 25
5.3 Min/Max Datalogging 25
6. Maintenance 25
6.1 Battery Selection 25
6.2 Input Protection 25
6.3 Calibration 25
7. Specifications 26
8. Warranty and liability 27
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1. Introduction
The MA 400 is designed to be a complete 4 to 20mA 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 (2-wire) or measure loop currents up to 24mA. It can also measure
process signal voltages up to 28VDC 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
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Battery
CE Complies with European Union Directives
DC
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual (Important Information)
Off
On
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.
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m
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.
m
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.
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2. Overview
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.
2) Hold the key down firmly.
3) Turn 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.
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20mA = 100%
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3.2 HART ™ Resistor Setup
The MA 400 incorporates an internal 250 ohm resistor to facilitate using a Rosemount 275
Communicator during calibration or installation of HART™ transmitters. The internal resistor takes the
place of the 250 ohm resistor normally installed during the use of the model 275 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 2 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™ 250 Ohm Resistor
Figure 2
Note: When the 250 ohm resistor is enabled the load driving capability is reduced from 1200
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:
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4.1 Milliamp Source
Figure 3 shows a typical application where the MA 400 is sourcing 4 to 20 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.
2) 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 (25%) 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.
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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
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4.3 Milliamp Measure
Figure 5 shows how to connect the MA 400 to measure a 4-20 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 20 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 24 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.
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