6270A
Operators Manual
46
Atmosphere
Manually select the barometric reference or manually enter a barometric value
from an outside source from the Atmosphere menu (Setup Menu>Measure
Setup>Atmosphere). If a barometer module is installed, the Product will
automatically select it as the default barometric reference. To change the
barometric reference, select the module and unit from the Atmosphere menu.
Head Height
For calibration of a unit under test (UUT) at a different height than the Product, it
is necessary to make a head-height correction. The head-height correction is the
vertical difference between the reference plane of the UUT to the bottom of the
display on the Product in inches, millimeters, or centimeters. See Figure 8.
After the measurement is made, the measurement value is entered into the
Product (Setup Menu>Measure Setup>Head Height). From the Head Height
screen, the measurement units and as medium (N2, Air) can be set. Additionally,
the Head Height direction and uncertainty for the UUT, Auxiliary 1, and Auxiliary
2 chassis' can be set. Auxiliary Chassis 1 and 2 are available when an additional
chassis is connected to the primary chassis. Select ABOVE if the UUT is above
the Product and select BELOW if the UUT is below the Product.
Note
Failure to make a head-height correction can result in an inaccurate
pressure measurement.
UUT
Correction
Measurement
Reference
Plane
Bottom of the
Display
huo020.eps
Figure 8. Head-Height Correction
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