HT instruments HT157 - Manual (Page 23)

HT155 - HT157
EN - 21
5.1.4. INTEGRATION ANALYSIS OPERATIONS
In this type of analysis, the instrument carries out an instant measurement, measures
integrated values and peak “C” values of the sound pressure level in the three frequency
weightings (A, C, Z) and in the three time constants (Slow, Fast, Impulse)
1. Use the “ ” or “ ” keys to select the “Integral” icon (see Fig. 19) and confirm with
“ ”.
Fig. 19: Integral analysis selection
2. The instrument shows the following screen relevant to the measured instant quantities:
 Line 1
 Lines 2-7
 Line 8
 Line 9
Fig. 20: Screen of instant values of Integral analysis
Line 1
The left part shows the current date/time set on the instrument, while the
right part shows the measuring range currently used by the instrument.
 Date/time setting
Use the “ ” and “
” keys to move the flashing cursor to fields YYYY
(year), MM (month), DD (day), HH (hours), MM (minutes) SS (seconds)
and use the “
” and “ ” keys to carry out the desired programming
 Configuration of the measuring range
Use the “ ” and “
” keys to move the flashing cursor to symbol “R” and
use the “ ” and “ ” keys to select the measuring range among the
following options: 0
90dB, 10 100dB, 20 110dB, 30 120dB, 40
130dB, 50 140dB according to the reading carried out by the
instrument. After each range modification, the reading takes
approximately 3s to become stable