HT instruments HT157 - Manual (Page 33)

HT155 - HT157
EN - 31
Line 9
This line contains:
 The “ ” icon, which indicates the battery charge level
 The “
” icon which indicated the 1/3 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
2. Press the “ ” key to start recording the values of the spectrum analysis 1/3 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. The instrument displays the following screen:
Fig. 30: Activation of recording of 1/3 spectrum analysis
3. By pressing the “ ” key while recording, the instrument is paused. Press the key a
second time to start recording again
4. When the instrument reaches the measuring time (Tm = Ts), the instrument stops the
integration measurement and the data are automatically saved in the memory
5. When pressing the “ ” key with paused instrument, measurement is stopped and the
result is saved in the internal memory
6. When pressing the “ ” key with paused instrument, the measurement being carried
out is cancelled and the instrument waits for a new recording
7. In List and Leq1s display, the following operations are possible:
 With cursor flashing on the “ ” icon, press the “ ” key to save the instant data
shown on the display in the memory area (see § ). During this operation, the “ ”
icon is completely highlighted for a few seconds, before it goes back to normal
display, to indicate correct saving