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Ready Tolerance
A Ready indication is generated when in control mode and the measured pressure is reading
within this ready tolerance value. When running an internal program, the ready indicator is shown
when the measured pressure is within the tolerance stored in the program. It is recommended that
the Ready tolerance be set to a value greater than the Control Stability Specification defined in
Appendix A.
Gas Head Pressure Correction
The term "head height" refers to the vertical distance between the sensing element in the device
under test and the ADTS's pressure reference plane. Once the user inputs the head height and
selects air or nitrogen, the ADTS automatically corrects for head pressure.
1. The Pressure Reference Line on the ADTS is defined as the bottom of the color display
where the display and the front panel join. This provides the reference plane against which
the device under test (DUT) pressure is measured. Determine the vertical distance between
the ADTS Pressure Reference Line and the reference plane of the device under test.
2. Press the Unit key found in the keypad and press in/mm [F1] to select either inches (in) or
millimeters (mm) for the head height entry.
3. The head height is set from the Menu | Menu |Setup | User. From the Main Menu
(press PREVIOUS until the Main Menu appears), press Menu [F6], press Menu [F6], then
Setup [F2], and then User [F2].
4. Press Medium [F3] to select either "Air" or "Nitrogen." The selected units will be
highlighted.
5. Press Position [F4] to select if the position of the Device Under Test is either "Above" or
"Below" the RUSKA 7750i. The selected units will be highlighted and appear in the Gas
Head description.
6. Use the rotary knob to highlight the label "Gas Head."
7. Use the numeric keypad to enter the height in the selected unit.
8. Press ENTER to accept the entry.
Atmosphere
The nominal barometric pressure value for the location that the ADTS is utilized should be
entered for atmosphere. This number is used to calculate the density of the test port pressure
medium and to correct for head pressure variances between the reference port of the ADTS and
the DUT.
Pressure Filter
Pressure Filter is used to adjust the degree to which the front display pressure value is filtered.
A value of four (4), is the default value. As the value increases, the filtering level increases,
however, the display update rate reduces. Typical filter values would range between 1 to 10. For
pressure sensors with full scale ranges of 1 psi (7 kPa) or less, a filter value up to 30 is typically
recommended.
4
Local Operation
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4-13
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