HT instruments HT157 - Manual (Page 27)

HT155 - HT157
EN - 25
5.2.2. OCTAVE BAND ANALYSIS (1/1)
5.2.2.1. Operations for sections LIST, GRAPH and TOTAL
2. Select the “List” icon and confirm with “ ”. The instrument displays the following
numerical screen:
 Line 1
 Lines 2,8
 Line 9
Fig. 23: Numerical screen of octave band analysis (1/1)
Line 1
The left part shows the current date/time set on the instrument, while the
right part shows the measuring range selected.
 Date/time setting
1. Use the “ ” and “
” keys to move the flashing cursor to fields YYYY
(year), MM (month), DD (day), HH (hours), MM (minutes) SS
(seconds)
2. Use the “ ” and “ ” keys to select the desired program:
 Configuration of the measuring range
1. Use the “ ” and “
” keys to move the flashing cursor to symbol “R”
2. 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 modification, the reading takes approximately
3s to become stable
Lines 2
 8
The central part of the display shows the instant values of the sound
pressure level for each central band frequency from 16Hz to 16kHz,
further to the values of the equivalent noise levels Leq1s and Leq,T
updated in real time at each second. Also the values of parameters LA,
LC, LZ weighted in modes A, C and Z are shown
Line 8
This line contains:
 The “ ” icon, which indicates the battery charge level
 The “
” icon which indicated the 1/1 measuring mode. In the
same position, the following messages can be displayed: “OVER” and
“UNDER”, to indicate that the measured values are respectively higher
and lower than the maximum and minimum range set. Operate on
Line 1 to change the measuring range value
 The “ ” icon allows selecting the current numerical display, the
graphic display of data and the total display
 The “Linst” shows the instant values, the “Leq1s” icon shows the
values of the level equivalent to 1s and the icon “Leq,T” shows the
values of the equivalent level of the whole measuring time
 The “
” icon which allows saving the values on the display