HT instruments HT157 - Manual (Page 22)

HT155 - HT157
EN - 20
Initial line
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.
Both parameters can be programmed, as with numerical display
Central lines
 By using the “ ” or “ ” keys to move the flashing cursor to the
“hh:mm” field and repeatedly using the “ ” or “ ” keys, the
instrument shows the graphic values of the 24 intervals from “0:00 to
23:00”. By moving the cursor to one of the parameters (e.g.: LAeqT)
and by using the “
” or “ ” keys, the instrument shows the graphic
values of the quantities exactly as for the numerical view
Final line
The left part of the line shows:
 The “ ” icon, which indicates the battery charge level
 The “
” icon, which indicates the current operating mode.
 The “Graph” icon, to indicate the type of graphic display of the results
(with flashing cursor on the icon, press the “ ” or “ ” keys to pass
to numerical display “ ”)
 The messages “Ready”, “Run”, “Wait” or “End”, to respectively
indicate: waiting to start measuring, measurement in progress, waiting
to start measuring in new range and end of measurement
 The indication in real time (e.g.: 49.0 dB) of the sound pressure level
measured by the instrument
8. Once the 24 intervals have elapsed, the recording stops and the result is
automatically saved in the instrument’s memory. The “End” message appears in the
lower part of the instrument (see Fig. 18). Each interval maintains the same name as
the measure
Fig. 18: Final display of 24Hours measure
9. To exit from the “24Hours” mode, press the “ ” key. The instrument shows the
message “Press Enter key to exit!”. Press “ ” to go back to the main menu. Press the
“ ” key again to go back to the measuring mode
10. Once measurement is completed, press “ ” to go back to the main menu