HT instruments HT157 - Manual (Page 18)

HT155 - HT157
EN - 16
Fig. 13: Graphic screen of statistic analysis
8. The screen shows the diagram of the statistic distribution corresponding to the
recording in progress, with update every second. The left part of the graphic displays
the statistic percentage of the sound pressure level corresponding to the dB value
measured by the instrument, which can be changed by means of the “ ” and “
”
arrow keys, within the measuring range reported on the x-axis. In the example in Fig.
13, the value of the sound pressure level is 61dB in 9.9% of the values measured
within the 40 – 139dB range.
9. Press the “ ” key to pass from the statistic distribution diagram to the cumulative
distribution diagram (Accumulation), which shows each statistic level of the noise
10. In the graphical screens, it is always possible to pause and/or stop recording in the
same way as with numerical display, which it is always possible to go back to by
pressing the “
” or “ ” keys, with the cursor on the “Graph” icon
CAUTION
The main menu cannot be selected while recording. Cancel or stop recording
to carry out this operation
11. Once the measuring time has 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