DH Instruments ADCS-601 Operation And Maintenance Manual Download

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7. MAINTENANCE OF TRACEABILITY AND RECALIBRATION

Page 139

<Exercise

Pressure>

: Box checked to exercise RPM4 monitor before

running validation.

<Test Point Unit>

: user preference (unit of measure of values in points array).

<Hold Limit >

: 0.001 kPa or equivalent

<Dwell

Time>

: Timed 45

<s>

: (Time to dwell at each point before taking

data, selecting

<manual>

dwells until the operator presses

[ENTER]

)

<Averaging Time [s]>

: 30 (Time over which data from the PG and FPG is

acquired and averaged at each validation point)

<Readings

Per

Point>

: 3 (Individual readings for specified averaging time at

each validation point)

<Validation

cycles>

: 1 (Number of times the sequence of pressure points in

the point array wil be executed. Each cycle results in a separate report)

<Validation points array>

: 10, 11, 12, 13, 14, 15 kPa or equivalent.

When the form is completed as desired, press

[Continue]

If the

<Exercise Pressure>

box was checked in the

[Validation Setup]

form, the

[Pressure Exersize Setup]

form appears (see Section 4.2.5). The

default values of

<Min>

<Max>

<Dwell>

and

<Cycles>

are 0, 15 kPa (max

validation pressure), 120 seconds and 3.

The validation process begins.

ADCS Tools

controls the process, stepping

through the points. Watch the

ADCS Tools Status Bar

for information on

what is occuring at any given moment.

At each point, the target pressure is set by the PG7601 system onto the
RPM4 Monitor and read for the

<Averaging Time>

. An average is taken for

the number of

<Readings Per Point>

specified. The RPM4 Monitor is then

connected to the FPG8601 system and the process is repeated. The
comparison of the PG7601 and FPG8601 is calculated following ((FPG8601-
RPM4) – (PG7601 – RPM4))

After the last pressure has completed, the system remains in current
conditios and the

FPG Validation Results Form

is presented.

View results form (see Figure 60).

<PASS>

<FAIL>

is clearly indicated.

<PASS>

indicates that the FPG8601 pressure standard is in tolerance as verified

by comparison with the PG7601 pressure standard (see Section 7.2.3.1).

<FAIL>

indicates that the FPG8601 pressure standard may be out of

tolerance or there is a problem with another component of the ADCS-601
system. Troublshooting should be performed to determine the cause of the
failure and correct it (see Section 7.2.3.1).

The

<FPG>

panel indicates the maximum disagreement observed between

the FPG8601 and the PG7601 in the test in the current pressure unit of
measure (FPG8601 reading – PG7601 reading) and in PPM ((FPG8601
reading – PG7601 reading)/PG7601 reading) 1000000).

The

<RPM4>

panel indicates the maximum disagreement observed between

the RPM4 Pressure Monitor and the PG7601 in the test in the current
pressure unit of measure (RPM4 reading – PG7601 reading) Pressing the

[Adjust RPM4]

button will cause the RPM4 calibration coefficients to be

adjusted to fit its readings with the PG7601 over the range of the
comparison. Note: Since the RPM4 is used only as a comparator in the test
process, its absolute agreement with the PG7601 is not significant.