HT instruments HT154 - Manual (Page 9)

HT154
EN - 8
4.3.2. Calibration procedure
Screwdriver
Portable calibrator
HT154
Sound Level Meter
Fig. 4: Connection of meter to portable calibrator HT150
1. Turn ON the meter.
2. Setting herewith configuration:
Frequency Weighting: A (dBA)
Integration time: FAST
3. Inserting with care the portable calibrator HT150 on meter microphone up to listen a
click, as shown in Fig.4.
4. Pressing LEVEL key and selecting “50-100” range at display.
5. Turn ON calibrator and select 94dB level at 1kHz sinusoidal frequency. Red LED on
calibrator must be ON.
6. Insert the screwdriver inside “CAL” trimmer and adjust the measured value up to read
“94.0” at display.
7. Extract from microphone and switch OFF calibrator.