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Sound Level Meter “ACO” Model 6226

Integrating-averaging Precision Sound Level Meter/


Integrating-averaging Sound Level Meter


TYPE 6224/ TYPE 6226






§  Percentile level (Lx) – any 5 selectable values


§  Measure equivalent continuous A-weighted sound pressure level capability (Leq)

Measure environmental noise required for securing occupational health capability


§  Wide linearity range of 100 dB


§  Equipped with an RS-232C function, allows for processing of data by PC


§  Equipped with memory function, allows for storing up to 15,000 bits of data


§  Backlite LCD screen for high-visibility and easy-on-the-eye display


§  Excellent cost/performance ratio overpowers comparably priced products









Applicable Standards

JIS C 1505, IEC 60651 Type 1,

IEC 60804 Type 1, IEC/CDV 61672-1 Class 1

JIS C 1502, IEC 60651 Type 2,

IEC 60804 Type 2, IEC/CDV 61672-1 Class 2

Measurement Range

27 ~ 130dB (A)

38 ~ 130dB (C)

41 ~ 130dB (F)

28 ~ 130dB (A)

33 ~ 130dB (C)

38 ~ 130dB (F)

Peak Level

38 ~ 138dB (A)

55 ~ 138dB (C)

60 ~ 138dB (F)

Measurement Frequency Range

20Hz ~ 20kHz (JIS range: 20Hz ~12.5kHz)

20Hz ~ 8kHz



1/2 Electret condenser microphone


1/2 Electret condenser microphone

Level Range Control

10dB 6 steps

Linearity Range


Time weighting characteristics

Fast, Slow, Impulse

Fast, Slow, Impulse

Frequency Weighting

A, C, Flat

Measurement Parameters

Lp: Sound pressure level

Leq: Equivalent continuous A-weighted sound pressure level

Le: Sound exposure level

Lmax: Maximum sound level

Lmin: Minimum sound level

Lx: Percentile level (5 values of free select)

Lpeak: Waveform peak hold (C weighting selectable)

Response Time For Constant Input Signal

1s, 3s, 5s, 10s, 1min, 5min, 10min, 15min, 30min, 1h, 8h, 24h, Manual (Max: 199H59M59S)

Sampling Time

20.8µs (Leq), 10ms (Lmax, Lmin)

Lx Sampling Time




                            Digital display

                            Bar display




Liquid crystal and Back light (128 x 64 points)

4 digits, Display Period: 1s

Display Period: 0.1s

Over: +3dB from upper limited scale     Under: -0.6dB from lower limited scale

4 steps display


Memorize the Sound pressure level or the Operation level (Approx. 15000 data)


Built-in (year/month/day/hour: minute: second)


Pause/ data clear


Electric calibration with internal oscillator (1kHz Sine wave)

AC Output

1Vrms for full scale Output impedance: 600Ω, resistance: more than 10kΩ

DC Output

2.5V for full scale, 0.25V/10dB Output impedance: 50Ω, resistance: more than 10kΩ

I/O Terminal

Interface: RS-232C Data: 8bits, Stop: 2bits, Parity:not, Baud rate: 4800, 9600, 19200bps

(direct output to printer, control and output data to computer)


Four 1.5V Alkaline cells IEC type LR6, Optional AC adapter

Alkaline dry cell: Approx. 24 hours (Manganese dry cell: Approx. 11 hours)

when Switch on a back light: Approx. 1/3

Operating Temperature Range

Temperature: -10°C ~ 50°C  Humidity: 30% ~ 90% (not condensing)


85 (W) x 310 (H) x 48 (D)

85 (W) x 284 (H) x 48 (D)


Approx. 370g


This product was added to our catalog on Tuesday 18 February, 2020.
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Nanomachinery Co., Ltd.
4, Soi Petchkasem 100 ,Phetchkasem Rd. ,Bangkaenue ,Bangkae ,Bangkok, 10160, THAILAND.
Tel : 086-322-6876 ,02-421-9927 ,Fax : 02-809-2591 E-mail : pongthorn@nano-machinery.com
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