Druck ADTS 403F, Calibration Manual

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Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 9
Enter Calibration Mode
4. Calibration
4.1 Enter Calibration Mode
1. Enter the calibration menu from the measurement or control menu by pressing F1 and F4
together.
2. The service PIN, if enabled protects both calibration and maintenance facilities from
unauthorized entry. If the service PIN is disabled, the display shows the main calibration
menu. To enable or change the service PIN, press the — key then enter the four digit PIN.
Enter 0000 to disable the PIN facility.
3. The date of the last main calibration will be shown for 5 seconds followed by the current date.
If the date is correct then press ENTER. If the date is incorrect then enter all 6 digits of the
current date. The format is shown as either:
i.
“(MDY)” (mm/dd/yy)
ii. “(DMY)” (dd/mm/yy)
Press ENTER to accept the new date.
Note: “Unknown” will be shown if the last calibration is not known, after a software update
for example.
4. The following screen then displays:
5. Select the type of calibration to be carried out.
6. Select the pressure source:
7. Select the channel for calibration:
8. Carry out the appropriate procedure in the following paragraphs.
4.2 Calibration Check
The procedure for calibration check is identical to the main calibration procedure except that
[ACTUAL VALUE] is not available and [END CAL] is replaced by [Ps END] which closes a valve
to protect static (Ps). Pressures must be applied in ascending order.
Note: The pitot (Pt) channel is checked in absolute mode, with Auto Zero automatically disabled.
Differential Qc or airspeed accuracy may be checked in normal user mode. For optimum
differential accuracy during these tests, auto zero should be ON. This is particularly significant for
very low airspeed values.
Note: The tolerance quoted in the following tables may need to be adjusted to allow for
measurement uncertainties of the calibration standard in use. The limits stated relate to the
(CALIBRATION)
F1 Main Calibration
F2 Calibration Check
F3 Rate Calibration
Source
F1 Internal
F2 External
F1 Ps Calibration
F2 Pt Calibration
F3 Ps&Pt Calibration