HT instruments HT157 - Manual (Page 36)

HT155 - HT157
EN - 34
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. 34: Total section screen 1/3 spectrum analysis – LeqT values
7. 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
8. By pressing the “ ” key while recording, the instrument is paused. Press the key a
second time to start recording again
9. When the instrument reaches the measuring time (Tm = Ts), the instrument stops the
integration measurement and the data are automatically saved in the memory
10. When pressing the “ ” key with paused instrument, measurement is stopped and the
result is saved in the internal memory
11. When pressing the “ ” key with paused instrument, the measurement being carried
out is cancelled and the instrument waits for a new recording
CAUTION
 The main menu cannot be selected while recording. Cancel or stop
recording to carry out this operation
 The “Max” and “Lock” functions are not active while recording values