Sound Level Meter SoundExpert LxT Larson Davis

SoundExpert LxT Specifications

Averaging ( Integration Method )

Linear or Exponential

RMS Time Weighting 

Slow, Fast or Impulse

RMS Frequency Weighting 

A, C or Z

Peak Frequency Weighting 

A, C or Z

Sample Rate 

51200 Hz

Peak Rise Time 

≤ 30 µs

Range  Level Error ( OBA ) 

≤ ± 0.1 dB

Compliance

ANSI Type 1, IEC Class  1

Ranges 

Singel Range for Broadband 

2 ranges  for OBA

Maximum Clock Drift at 77 °F ( 25 °C ) 

< 2.6 s per day

1/1 and 1/3 Octave Filters

1/1 Octave Filters 

8 Hz to 16 kHz

1/3 Octave Filters 

6.3 Hz to 20 kHz

Filter Selection 

None, 1/1, 1/3, or 1/1 & 1/3

Frequency Weighting 

A, C or Z ( unweighted )

Maximum Spectrum 

Maximum in each band or at broadband  Lmax

Compliance 

ANSI and  IEC Class  1

Logging and Measurement History

Logging Period 

1 s to 24 hr

Logged Parameter

User selectable from Leq; Lmax; Lmin; LCSeq – LASeq; LAIeq – Laeq ; 1/1 OBA Leq, Lmax, Lmin; 1/3 OBA Leq, Lmax, Lmin,Battery, Internal Temperature

Measurement History Period ( Continuous run mode )

1 min to 24 hr

Measurement History Parameters  

Leq; Lmin w/time;  Lmax w/time;  Lpeak w/time;  Ex- ceedance counts w/duration; LAeq, Lceq, 1/1 OBA Leq, Lmax, Lmin; 1/3 OBA Leq, Lmax, Lmin

Community Noise

Measured Parameters 

LDEN, LDN

Day, Evening, Night Times 

Programmable

Evening and Night Penalty

Programmable

Time Averaged Level Integration Time

Minimum 

1 s

Maximum ( error < 0.5 dB )  

> 23 days

Ln Percentile

Number of User Defined Ln’s 

6

Ln Resolution 

0.01 %

Distribution Table Resolution 

0.1 Db

Markers

Number of Markers 

10

Predefined Markers 

5

Measurement Modes

Available Modes 

Manual Stop, Timed Stop, Stop when Stable, Continu- ous, Single Block Timer, Daily Block Timer

Manual Stop 

Measurement defined by run and stop button

Timed Stop 

Time in hh:mm:ss

Stop When Stable 

Change  < xx.x dB for hh:mm:ss

Continuous 

Auto file store 1, 2, 4, 6, 12, 24, 48, 96, 144 times per day

Single Block Timer 

Start date and time to end date and time

Daily Block Timer  

3 unique start/stop  times per day, multiple days

AC/DC Output

Connector 

2.5 mm stereo

AC Output Maximum Voltage 

± 2.3 V peak

AC Output Recommended Load 

≥ 16 Ω

DC Output Resolution 

10 mV/dB ( 0 to 100 dB )

DC Output Time Weighting 

Follows SLM Setting  ( F,S,I )

DC Output Frequency Weighting 

Follows SLM Setting  ( A,C,Z )

Dynamic Range ( typical )

A Weighted 

17 dB to 118 dB

C Weighted 

19 dB to 118 dB

Z Weighted 

24 dB to 118 dB