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Training Guide in Surface Weather Observations - Multiple Choices

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7.1 Altimeter Sett<strong>in</strong>g - APHPHPHPH CHAPTER 7<br />

PRESSURE<br />

A - International <strong>in</strong>dicator for altimeter coded <strong>in</strong> <strong>in</strong>ches of mercury.<br />

PHPHPHP H - Altimeter is coded <strong>in</strong> tens, units, tenths, and hundredths of <strong>in</strong>ches of mercury<br />

An altimeter sett<strong>in</strong>g is the pressure value to which an aircraft altimeter scale is set so that it will <strong>in</strong>dicate<br />

the altitude above mean sea level of an aircraft on the ground at the location for which the value was<br />

determ<strong>in</strong>ed.<br />

Figure 7-1. The Use of Altimeter Sett<strong>in</strong>gs.<br />

The altimeter sett<strong>in</strong>g is determ<strong>in</strong>ed directly from an altimeter sett<strong>in</strong>g <strong>in</strong>dicator. The follow<strong>in</strong>g is a list<br />

of common pressure-measur<strong>in</strong>g <strong>in</strong>struments:<br />

a. Precision Aneroid<br />

b. Altimeter Sett<strong>in</strong>g Indicator (ASI)<br />

c. Digital Altimeter Sett<strong>in</strong>g Indicator (DASI)<br />

d. Mercury Barometer<br />

e. Aircraft-type Altimeter [SAWRS only]<br />

f. PARASCIENTIFIC Inc., Digiquartz Pressure Transducer<br />

7-1

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