HT instruments HT157 - Manual (Page 30)

HT155 - HT157
EN - 28
CAUTION
The “Max” and “Lock” functions are not active for instant values shown in the
graphic bar
4. With flashing cursor on the “Linst” item, select the “Leq1s” options with the “
” or
“ ” keys. The instrument shows the following screen relevant to the values of the
noise level equivalent to 1s:
Fig. 27: Total section screen 1/1 spectrum analysis – Leq1s values
5. Use the “Save” functions to save the screen on the display and the options “Lock” and
“Max” respectively to block the values on the display and show the maximum value of
the quantities
6. With flashing cursor on the “Linst” item, select the “Leq,T” options with the “ ” or “ ”
keys. The instrument shows the following screen relevant to the values of the
equivalent noise level:
Fig. 28: Total section screen 1/1 spectrum analysis – LeqT values
18. Press the “ ” key to start recording the values of the spectrum analysis 1/1 with a
duration equal to the total measuring time (Tm) defined in the programming menu (see
§ 4.6). In this condition, the indication of the measuring range disappears and the
measuring time appears, and cannot be changed while recording, and the “Leq,T” icon
appears automatically on the display
19. By pressing the “ ” key while recording, the instrument is paused. Press the key a
second time to start recording again
20. When the instrument reaches the measuring time (Tm = Ts), the instrument stops the
integration measurement and the data are automatically saved in the memory