General-tools-and-instruments DCFM8906 v.1 Manuel d'utilisateur télécharger pdf (Page 14)

make a performance measurement inside an HVAC/R duct.

A multi-point average air speed reading is inherently more

representative of a system’s output than any single-point

reading, whether in the center of a duct or near one of its sides.

To make and store the multiple measurements, use the

HOLD and MIN/MAX REC SINGLE-POINT buttons. Start by

positioning the meter’s vanes at the first point to be

measured. When the reading is stable, press the HOLD

button. This sounds the beeper, makes Hold appear on the

top line of the upper display and freezes both readouts—the

normal consequences of pressing the HOLD button.

Now press the MIN/MAX REC SINGLE-POINT button. The

beeper will sound and the temperature reading in the lower

display will temporarily change to the number 1 to signify that

this is the first of several air speed readings stored (Fig. 5).

Fig. 5. The brief display indicating storage of a 325 ft/m

air speed reading at point 1

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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General-tools-and-instruments DCFM8906 v.1 Manuel d'utilisateur Page 14