5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 113 © 1998 DH Instruments, Inc.
Press ENTER to proceed with the point.
The next screen provides a display of
current pressure as measured by the
reference transducer and range being
calibrated using the current PA/PM and
PA(z)net and an instruction of the
pressure to be applied by the calibration
standard for the point:
14.50 psi a Pt1
Set 200 psi a
It is not necessary that the pressures applied be equal to the nominal pressure
value requested for the point as long as the exact value of the applied pressure is
entered. Best results will be obtained if the pressure actually applied is within
± 2 % of F.S. of the range being calibrated from the nominal increment. On the Lo
pressure reference transducer, the zero psia point should be set using the lowest
accurate pressure point of the piston gauge being used as a standard.
Apply the requested pressure using direct
pressure control keys (see Section 3.1.2.2)
and press ENTER when ready. The next
screen provides a 180 second countdown
to allow full stabilization of the system and
reference transducer at the set pressure:
199.97 psi a Pt1
wait 180 seconds
The 180 counts down to zero. During the countdown time, maintain the pressure
constant. When the countdown completes, the screen prompts for entry of the
pressure applied by the calibration standard:
1. Entry field for entering the exact value of the
pressure applied by the calibration standard.
Comes up with the nominal pressure for this
calibration point.
ENTER standard pres.
200 psi a Pt1
Enter the exact pressure applied by the calibration standard. The next screen
displays the current reading of the reference transducer and range being
calibrated and prompts for ENTER to log the reading:
1. Current reading of the reference transducer and
range being calibrated.
ENTER to take point
199.97 psi a Pt1
When ENTER is pressed, the reading is taken
from the reference transducer and range being
calibrated and the RESULT screen is presented:
199.97 psi a Pt1
200 std RESULT
Observe and check the values recorded for that point. Press ENTER to accept
the results and proceed, press ESCAPE to make changes (see Backing Up in the
Calibration, Repeating Points, Aborting below).
The RESULT display is the only opportunity offered to record "as received"
data for the reference transducer and range being calibrated. If you want a
record of as received data without having to perform calculations after the
calibration, record each result screen as it is presented.
When the RESULT screen is accepted by pressing ENTER, execution proceeds
to the next calibration point. Go to the first screen of OPERATION above.
After the last point (Pt11) of calibration of the current range has been completed,
execution proceeds with selection of the next range to calibrate. Go to Section 5.4.4.3.
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