HT instruments HT157 - Manual (Page 20)

HT155 - HT157
EN - 18
Line 1
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 the parameters can be programmed by the user as follows:
 Date/time setting
1. Use the “ ” and “
” keys to move the flashing cursor to fields YYYY
(year), MM (month), DD (day), HH (hours), MM (minutes) SS
(seconds)
2. Use the “ ” and “ ” keys to select the desired program:
 Configuration of the measuring range
1. Use the “ ” and “
” keys to move the flashing cursor to symbol “R”
2. Use the “ ” and “ ” keys to select the measuring range among the
following options: 0
90dB, 10 100dB, 20 110dB, 30 120dB, 40
130dB, 50 140dB according to the reading carried out by the
instrument. After each range modification, the reading takes
approximately 3s to become stable
Line 2
 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 24 intervals from “0:00 to 23:00” and the values
of the Ld, Ln, Ldn parameters. By moving the cursor to the symbol “
”
and pressing the “ ” or “ ” keys, the instrument shows the
following quantities in a horizontal line: LAeqT, Lmax, Lmin, L5, L10,
L50, L90, L95, SD, LAFeq, corresponding to the statistic analysis of
the sound pressure level with frequency weighting “A” and time
constant F
Lines 3- 8
These lines show in real time the values of the quantities integrated by
the instrument during the whole measuring time and the resulting values
at the end of each interval
Line 9
The left part of the line shows:
 The “ ” icon, which indicates the battery charge level
 The “
” icon, which indicates the current operating mode.
 The “
” icon, to indicate the type of numerical display of the results
(with flashing cursor on the icon, press the “ ” or “ ” keys to pass
to graphic display “Graph”)
 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
4. With the message “Ready” on the display, press the “ ” key to enter the instrument’s
programming menu and set the relevant parameters (measure name, measuring time,
etc…) as described in § 4.6). Press the “ ” key to go back to the measuring screen