Crystal FastCalXP Calibration Software Bedienungsanleitung PDF herunterladen (Seite 22)

Calibrating Gauges  20

FastCalXP Operation Manual

The Adiabatic E ect

Regardless of what  uid is used in the comparator there will always be a small amount of air remaining between the  uid and the gauge sensor. When pres-

sure is increased in the comparator the air is pressurized and this pressurized gas heats up. When the pressure stops increasing, the gas cools and the pressure

in the comparator decreases slightly. The reverse is true when the pressure is reduced in the comparator. This is called the adiabatic e ect.

The result of the e ect for FastCalXP is that the pressure is not immediately stable when a new target pressure is reached. At high pressures, the adiabatic ef-

fect can be large. For example, at 10000 PSI the pressure can change by 100 PSI or more as the gas stabilizes thermally.

With FastCalXP, there are two approaches to working with the adiabatic e ect. One approach is to adjust the comparator and wait for the pressure to stabilize.

This approach is used in the Actual data acquisition mode. The other approach is to take advantage of the adiabatic e ec

t with the Peak data acquisition mode.

Actual or Peak Mode calibration can be selected in the Calibration Window. Refer to the discussions of the techniques used in Actual Mode Calibration on

page 21 and Peak Mode Calibration on page 22.



To change the default Data Acquisition Mode

 Choose Options from the Tools menu and click on the Calibration Settings tab.

Completing a Calibration

When the exercising is complete and the data acquisition mode has been selected, the calibration process can begin.

1 Even in auto peak mode, the  rst zero-level measurement must be made manually by pressing Enter, clicking on the Next Point button, or pressing the foot switch.

Refer to the discussions of Actual Mode Calibration on page 21 and Peak Mode Calibration on page 22 for guidance with making measurements.

As the calibration progresses, the gauge will pass or fail at each pro le point, or Target Pressure. To pass, the Gauge must be equivalent to the Reference

within the tolerance range. The tolerance is de ned as the accuracy of the gauge at the measured pressure. The data is displayed in a box at the right of the

calibration window.

Failed pro le points are shaded red. The gauge must pass at every pro le point to pass the calibration.

2 Use the Back buttons

to return to a previous step or to start over.

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