HT instruments HT157 - Manual (Page 41)

HT155 - HT157
EN - 39
6.1.3.2. Calibration result display
The instrument allows saving up to 256 calibration operations. For subsequent operations,
the memory space is automatically reset and only the last operation carried out is saved.
To recall the operation on the display, proceed as follows:
1. Use the keys “ ” or “ ” to select “Rec.” and confirm with “ ”. The instrument shows
the following screen, which contains the date/time in which the operation was carried
out and the measured sensitivity level
Fig. 38: Calibration result display
2. Use the “
” or “ ” keys to go to the screens on the following pages
3. Press the “ ” key to exit the mode and to go back to the previous page
6.1.4. DIRECT
ACOUSTIC CALIBRATION
In case the calibrator is not available and with an a priori known indication of the sensitivity
level of the microphone, this parameter can be set directly on the instrument as follows:
1. Use the keys “ ” or “ ” to select “Mod.” and confirm with “ ”. The “Mod” field
appears highlighted
2. Use the “ ” or “ ” keys to move the cursor to Line 3 and the “ ” or “ ” keys to
define the value in steps of 0.1dB. Press and hold the keys for an increase/decrease in
steps of 1dB. Accordingly, also the “App” field is highlighted
3. Move the cursor to the “App” field and press “ ” to confirm the sensitivity level