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Castle Sound Level Meters

Castle Sound Level Meters
Castle Sound Level Meters
Product Code : GA6224
Product Description

Castle Sound Level Meters
Specification for Castle 6224 (Class 1)

Measuring noise really does not have to be complicated, even for the novice, and the Castle 6224 (Class 1) Integrating sound level meter is designed with this in mind.
The meter is ideally equipped for carrying out Noise at Work Risk Assessments, as well as the majority of environmental survey work. The range of parameters measured, the wide measuring capability of the meter and the ease of use, mean that this equipment is suitable for anything from aircraft noise to lawnmower design, and from construction sites to laboratories.

Noise at Work Measurements

The Castle 6224 provides the essential measurements required by the Control of Noise at Work Regulations 2006, including Leq (equivalent continuous level) in ‘A’ and ‘C’ weightings, and Cpeak. The meter can data-log any of these parameters in up to 10,000 data-memories, making it more than powerful enough for the task in hand.

Environmental Monitoring

Also ideally suited to environmental monitoring, the Castle 6224 can measure 5 select- able percentile values and sound exposure (LE). Most environmental measurements re- quire Leq and L90 plus possibly one or two other measurements. These can all be measured simultaneously with the Castle 6224 and data-logged into its 10,000 data-point memory.

Multi- purpose Measurement

Many sound measuring tasks require the measurement of Leq (equivalent continuous level), Lmax (Maximum rms level), LE (Sound Exposure) or percentiles, and all of these can be completed using the Castle 6224 with its accessories.


The Castle 6224 (Class 1) Integrating Sound Level Meter has an easy to follow menu system and clearly marked keys, all designed to make the meter simple-to-use. The back-lit LCD display is also very clear with large figures and a quasi-analogue display bar to show the changes in sound level as they happen.


  • Equivalent continuous level (Leq)
  • 5 user selectable percentile values (Ln)
  • Wide Linearity range of 90dB
  • RS232 for data output to optional software
  • Memory storage for 10,000 data-points
  • Back-lit LCD display


Castle 6224


Precision Integrating Sound Level Meter


Conforms with IEC 61672-1:2002, Class 1, IEC 60651:1979 and IEC 60804:2000 Type 1

Measuring ranges

27 – 130dB(A), 38 – 130dB(C), 41 – 130dB(F)

Frequency range

20Hz – 20kHz


7146N 1/2” electret condenser microphone

Time weighting


Peak range

50 – 133dB(A), 60 – 133dB(C), 70 – 133dB(F)

Level range

Six ranges: 20 – 80dB, 20 – 90dB, 20 – 100dB, 20 – 110dB, 30 – 120dB, 40 – 130dB

Linearity range


Frequency weighting


Measurement items

Lp, LMH, Leq, LAe, Lmax, Lmin, Lx (L5, L10, L50, L90, L95), Peak. 1s, 3s, 5s, 10s, 1min, 5min, 10min, 15min, 30min, 1h, 8h, 24h manual (max: 199h 59m 59s)

Measurement time

20.8μs (Leq), 10ms (Lmax, Lmin)

Sampling interval


Lx Sampling interval

LCD with back light (128×64 dots)


Four line, resolution 0.1dB (display update 1s)

Digital display

Display update: 0.1s

Bar display

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


Four level display of battery condition

Battery display

Approximately 10, 000 samples: 1, 000 sets of results

Built-in memory

Year/month/day/ hour : minute : second

Built-in calendar

Pause and a function that deletes preceding 3 or 5 sec. data


Internal generator (1 kHz sine wave)

Calibration signal

1Vrms (FS), output impedance: 600Ω, load impedance > 10kΩ

AC output

2.5V (FS), 0.25V/10dB, output impedance: 50Ω, load impedance > 10kΩ

DC output

Castle 6224

RS232 interface

RS-232C (asynchronous)

data bits : 8 bits

stop bit : 1 bit

parity : none

baud rate : 4800, 9600, 19200 bps

Power supply

Four 1.5V size-AA batteries or AC adapter

Battery life

Alkaline batteries: 20 hours continuous operation. Use of LCD backlight will shorten battery life (approximately 1/3).

Operating temperature

-10 to +50°C


30% to 90% (without condensation)


85(W) × 287(H) × 46(D) mm


370g (including batteries)


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