Ajustage E
NTA47262-000A6 45 / 55
E.7 Adjustment
RECOMMENDATIONS
The unit has been adjusted in our works. Any inadvertent operation will irreversibly modify the unit’s
adjustments.
The authority responsible for the usage of this unit must be sure that the person in charge of the
adjustment is well advised of the precautions to be taken before performing this operation.
AOIP recommends returning the unit to their works so that the adjustment can be performed under
ideal conditions.
The warranty is lost if these recommendations are not respected.
Environment E.7.1
Temperature: 23°C 5°C.
Humidity: 45% to 75%.
Warming-up: 1 hour.
Adjusting the Unit E.7.2
This operation should only be performed under stable environmental conditions (23 degrees C). The unit must
be temperature stabilised as must the reference equipment used. If these conditions cannot be met, it is
preferable to return the unit to the factory.
To adjust the unit, you will require reference resistors calibrated with a degree of uncertainty that does not
exceed 1x10
-4
. The reference equipment must accept the corresponding calibration current levels.
Ranges to adjust: Pt100, 5 mΩ, 25 mΩ, 250 mΩ, 2500 mΩ, 25 Ω, 250 Ω, 2500 Ω.
The measurement range settings are performed at one point.
We recommend reference values in excess of 80% of the calibration full scale range.
Pt100 calibration is not a type of measurement calibration, it is used in the temperature compensation
measurements; it must therefore be adjusted too, at two points, at a low point and at a high point. We
recommend using reference levels of close to 100 Ω for the low point and 115 Ω for the high point, with the
lower and upper limits being 98 Ω and 120 Ω.
To adjust the range levels, connect the calibration references using the measurement connectors.
To adjust the Pt100 calibration level, connect the calibration references to the probe (see 3.2.6).
Reminder: The maintenance menu is password protected.
Adjusting the 5 mΩ, 25 mΩ, 250 mΩ, 2500 mΩ, 25 Ω, 250 Ω, 2500 Ω range levels.
1. Call up the maintenance menu.
2. Choose the AdJ command from the menu.
A sub-menu will open so that you can choose the calibration level to adjust.
3. Choose the range to adjust.
4. Check that your calibration reference is properly connected.
5. Choose AdJ H and enter the calibration reference value.
6. Choose MEAS H, and the adjustment is performed.
7. The -AdJ- message indicates that adjustment has taken place normally.
Adjusting the Pt100 probe measurement.
1. Call up the maintenance menu.
2. Choose the AdJ command from the menu.
A sub-menu will open so that you can choose the calibration level to adjust.
3. Choose Pt100.
4. Check that your calibration reference is properly connected.
5. Choose AdJ L and enter the calibration reference value.
6. Choose MEAS L, and the low point adjustment is performed.
7. Choose AdJ H and enter the calibration reference value.
8. Choose MEAS H, and the high point adjustment is performed.
9. The -AdJ- message indicates that adjustment has taken place normally.
The following error messages may be displayed during the adjustment procedure:
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