TB 9-4920-459-24
(d) Press CLEAR/QUIT key and select CALIBRATION MODE by pressing F1
and F4 keys simultaneously.
(e) When the last calibration date and the current calibration date are
displayed, press the ENTER key, and accept the current calibration date, or re-enter the
date if incorrect.
(f) The main calibration menu will be displayed. Press F1 key to select MAIN
CALIBRATION.
(g) Press F1 key to select INTERNAL PRESSURE SOURCE.
(h) Press F4 key to select Ps and Pt absolute calibration. The calibration screen
will be displayed.
(i)
Press F2 key to select RATE key and enter 10 psi/min.
(j)
Press F1 key to select AIM and enter the value 1.6800.
(k) Allow the aim to be achieved, wait 1 minute, press F3 to select ACTUAL
VALUE and enter the same value that was entered in the previous step.
NOTE
After entering the value, there is a short pause before
returning to the calibration screen.
(l)
Repeat steps j and k with the aim value of 15.5000.
(m) Press F4 key to select END Ps. Check reported span and zero shifts for
abnormally large errors which could indicate data entry errors. Zero adjustment is expected
to be within 0.015 psi. Slope adjustment is expected to be within 0.1 percent reading.
(n) Press F1 key to accept the reported span and zero shifts, if accurate. If not
accurate, repeat the non-reportable adjustment.
(o) Press F4 key to select END CAL. Check reported span and zero shifts for
abnormally large errors which could indicate data entry errors. Zero adjustment is
expected to be within 0.015 psi.
(p) Press F1 and select YES to accept the reported span and shifts if accurate.
If not accurate, repeat the non-reportable adjustment.
(q) Press CLEAR/QUIT key repeatedly until the display reads BACK UP
NEW CALIBRATION DATA? Press F1 key to select YES. When GO TO GROUND? is
displayed, press F1 key to select YES. When SAFE AT GROUND is displayed press
CLEAR/QUIT key.
(r) Replace the calibration screw to its normal position.
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