Percent Error Mode; Min/Max Datalogging; Maintenance 5; Battery Selection - Ecom MA 400 Operating Instructions Manual

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.
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Caution: Never connect the AC adapter/charger with the 9V alkaline battery installed.

6.2 Input Protection

The MA 400 incorporates a fuseless input protection and will tolerate most misconnections up to
50 VAC or 50 VDC for up to 30 seconds duration. Because of this protection no maintenance
is required.
6.3 Calibration
The MA 400 is designed to hold its rated accuracy for a minimum of one (1) year. It is therefore
recommend that an annual re-calibration be done to ensure operation within specification.
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