â·ÃÊͺ¶ÒÁÃÒ¤Ò à¤Ã×èͧÁ×ÍÇÔ·ÂÒÈÒʵÃì ÍØ»¡Ã³ìÇÔ·ÂÒÈÒʵÃì à¤Ã×èͧÇÑ´ÃдѺ¤ÇÒÁ´Ñ§àÊÕ§ Sound Meter > Sound Level Meter à¤Ã×èͧÇÑ´àÊÕ§ SL5868P 4 measurement parameters: Lp (sound level), Leq (Equivalent Continuous A Sound Level), Lmax (Maximum Sound Level) Sound Level Meter à¤Ã×èͧÇÑ´àÊÕ§ SL5868P Compatible with standards of IEC 651 Type 2, ANSI 1.4 Type 2 Widely used to test the sound level of environment, machinery, vehicle, ship and other noise. Multi-functional. It offers 4 measurement parameters: Lp (sound level), Leq (Equivalent Continuous A Sound Level), Lmax (Maximum Sound Level) and LN (Percentage of all readings over alarm value set). With alarm set and alarm output This meter permits choice of 'A', 'C', or 'Flat' weightling and 'Slow' / 'Fast' response times. Auto range selection and digital display with no guessing errors Manual or automatic shut down. The tester can be switched off by pressing the power key at any time. On the other hand, the tester can be set to auto power off between 1 - 9 minutes or disable auto power off. The tester can memorize 30 groups of measurement results and measuring conditions for later use or download to PC. Supplied with CD software and 2 cables for RS232 / USB connection. You can download your obtained data from the sound level meter to your PC computer for statistics, printing and analysing. Specifications: Display : 14mm (0.55") LCD with backlight Parameters measured : Lp, Lmax, Leq, LN. Measurement Range : Lp : 30 - 130 dB (A) 35 - 130 dB (B) 40 - 130 dB (C) Leq : 30 - 130 dB (10 s, 1 min, 5 min, 10 min, 15 min, 30 min, 1 hour, 8 hours, 24 hours) LN : 0 - 100% Resolution : 0.1 dB Accuracy : ± 1 dB Frequency weighting : 'A', 'C', 'F' (Flat) Time weighting : Fast (125 ms) , Slow (1 second) Microphone : 1/2 inch celctret condenser type Memory : 30 groups with measuring conditions Built-in calibration signal : 94 dB at 1 kHz (sinusoidal) Frequency range : 20.0 to 12,500 Hz Alarm value set : 30 - 120 dB Alarm output : LED and optional relay contact (NC) PC interface : RS232C Low battery indication Power supply : 4 x 1.5v AAA batteries (not included) External DC power supply : 6V DC, 100mA (AC/DC adapter not included) Item size : 236 x 63 x 26 mm / 9.3 x 2.5 x 1.0 inch Item weight : 170g (after inserting batteries) Nicety SL5686P Sound Meter à¤Ã×èͧÇÑ´ÃдѺàÊÕ§ à¤Ã×èͧÇÑ´àÊÕ§