Copyright 1996 Baker Hughes Company.
14 | ADTS 403/405 Calibration Manual–English
Chapter
4.
Calibration
•
If a small number of applied pressures are used for calibration adjustment, it is
recommended that the resultant performance is checked at pressures between these points
to confirm linear response over the range.
[END CAL]
•
This function completes the calibration of the relevant channel. In combined static (Ps) and
pitot (Pt) mode, selecting [END CAL] for the first time completes the static (Ps) calibration,
selecting [END CAL] for the second time completes the pitot (Pt) calibration.
•
When [END CAL] is selected, the required zero and slope corrections are calculated and
displayed. These can either be accepted or rejected. If accepted, the calibration will be
updated. If rejected, the calibration will not be updated.
•
A further four functions are available when the INTERNAL pressure source has been
selected.
[AIM]
•
This allows the next calibration point to be entered.
•
Select [AIM] then enter the required pressure using the units shown on the display. The
pressure will change towards the new AIM using the rate selected by [RATE].
•
If necessary, check the current AIM value by select [AIM]. Press QUIT to return to the
calibration screen.
[OFF]
•
This switches the pressure controllers OFF to enable leak testing of the system.
[ON]
•
This switches the pressure controllers ON again after leak testing.
[RATE]
•
This allows the rate of change of pressure to be entered.
•
Select [RATE] then enter the required rate of change of pressure using the units shown on
the display.
•
If necessary, check the current RATE by selecting [RATE]. Press QUIT to return to the
calibration screen.
4.7 Calibration and Adjustment of the Static Channel
Before starting this procedure carry out a leak test as detailed in Section 2. Set the unit to
measurement mode, main calibration, external pressure source and static (Ps) calibration as
detailed in 4.1.
1. Connect calibration standard to the static output.
2. The display prompts for the date of calibration DD/MM/YY.
CAUTION
Unless the [END CAL] instruction is given, the static PS sensor will
be over-pressured with pitot PT values.
CAUTION
The AIM values are not limit checked. Ensure that the required value
is correctly entered.
CAUTION
The rate values are not limit checked. Make sure that the required
rate is correctly entered. High rates of change can damage sensitive equipment.
Summary of Contents for ADTS 403F
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