Specifications - Extech Instruments SL355 User Manual

13. Specifications

Applicable Standards:
±1dB high accuracy meets Class 2 standards (IEC 61672-2013 and ANSI/ASA S1.4/Part 1)
IEC 61252:2000, ANSI S1.25 – for dose meter and sound exposure meters
IEC 60651 – 1979 Type 2 for sound level meters
IEC 60804 – 2000 Type 2 for integration sound level meters
ANSI S1.43 – 1997 for integrating sound level meters
Microphone: 1/2-inch electret condenser microphone with 31-inch integral cable.
Display: Liquid Crystal Display
Measurement Ranges:
Linearity and Indicator ranges at 4 KHz (IEC 60804):
60 – 130: 60 – 130dB (A and C)
70 – 140: 70 – 140dB (A and C)
Peak Ranges:
'C' Frequency Weighted Peak or Linear (Z) Peak over the top 40dB of each range:
60 – 130db: 93 – 133dB Peak
70 – 140db: 103 – 143dB Peak
Accuracy: ± 1.0 dB @ 1kHz
Frequency Weighting: RMS Detector: 'A' or 'C'; Peak Detector: 'C' or 'Z' (flat or linear).
Response Time Weighting: Fast and Slow (RMS detector).
Exchange Rate (Q): 3, 4, 5 or 6 db
Stabilization Time: 10 seconds after the meter is switched on.
Threshold and Criterion Levels: Threshold Level: 70 – 90dB in 1dB steps; Criterion Level: 80, 84, 85
or 90dB.
Overload Indication (
Under–Range Indication (
High Level Detector: 115dB
Keypad Lock:  and  simultaneously to lock;  and  simultaneously to unlock.
Clock: Real-time clock with calendar.
Memory: 20 noise surveys can be stored.
Measurement Control: Measurement Duration may be set to 5, 10, 15, or 30 minutes or 1, 2, 4, 8, 10,
12, or 24 hours.
Timers: Up to 5 timers (automatic start and stop) can be set (maximum up to one month ahead of
measurement time). Timer Controlled Start/Stop: Configured using PC software or meter keypad.
Logging: All measurement parameters values can be logged, if the Logging Period is ≥ 1 minute.
): 0.1dB above the selected measurement range.
): 1dB below the selected range.
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