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Summary of Contents for Casella 620 Series
- Page 1 USER MANUAL 620 Series Enhanced Digital Sound Level Meter HB3340-03 March 2023 Casella Holdings Limited Regent House, Wolseley Road, Kempston, Bedford. MK42 7JY T:+44(0) 1234 844 100 F:+44(0) 1234 841 490 E: info@casellasolutions.com www.casellasolutions.com...
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Page 2: Table Of Contents
620 Series Contents Safety and warnings ................4 Disposal ......................5 Disclaimer ....................6 Introduction ..................7 Instrument features ..................7 Key features ........................7 New features for 2023 ...................... 7 Frequency analysis ......................7 Controls ....................8 Microphone and pre-amplifier ............... 9 Soft keys ......................9 Navigation keys .................... - Page 3 620 Series Delete ..........................22 Record Voice Notes ......................22 Event data audio ......................22 Status ......................23 GPS Location ..................23 Connectivity ..................24 Power socket ....................24 USB ....................... 24 Audio socket ....................25 System Tools ..................25 Calibration ..................
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Page 4: Safety And Warnings
620 Series Safety and warnings The 620 series will not present a safety risk when you use it as instructed in this User Manual. However, it is possible that the environment where you use the instrument may present a safety risk. For this reason, always follow correct, safe working practices. -
Page 5: Disposal
620 Series • Remove all batteries from the 620 series if you will not use the instrument for a long time. • Always follow local regulations to dispose of used batteries. CAUTION The 620 series is not waterproof. Do not immerse the instrument in water or use it in the rain. -
Page 6: Disclaimer
620 Series Disclaimer Do not use the 620 series until you have thoroughly familiarised yourself with this manual or have been instructed by a Casella engineer. A quick start guide will help you get started. At the time of writing, this manual was up to date but due to continual improvements the final operating procedures may differ slightly from those in the manual. -
Page 7: Introduction
The 620 series is based on the very latest digital signal processing (DSP) technology and has a colour TFT display with an intuitive user interface. It encompasses functionality from basic sound level measurement to integrating and real-time octave band analysis , the latter depending on the exact model. -
Page 8: Controls
620 Series Controls The 620 series has a compact, ergonomic and robust ‘rubber grip’ case design that fits comfortably in the hand when not mounted on a tripod. Referring to figure 1 below, the windshield (1) should be used at all times (except during Calibration) to cover and protect the microphone, which is screwed onto the fixed pre-amplifier (2). -
Page 9: Microphone And Pre-Amplifier
620 Series Microphone and pre-amplifier The 620 series has a fixed pre-amplifier and removeable ½ inch (12.7 mm) pre-polarised microphone. There are two types of microphone available depending on the accuracy Class, namely:- • CEL-251 microphone used on Class 1 versions, 50 mV/Pa sensitivity •... -
Page 10: Navigation Keys
620 Series Colour coding in more detail is as follows in figure 3: Screen Description Colour Stop screens – These screens are displayed when the instrument has completed initialisation after power on, as well as before and after taking measurements. -
Page 11: Operation
Batteries To extend battery life, if the 620 series is not taking a measurement and there are no key presses, the instrument will automatically turn off after a period of 5 minutes. This auto power off facility is disabled when the 620 series is powered from external 12VDC or USB. -
Page 12: Turning The Instrument On/Off
620 Series Figure 4 Turning the instrument On/Off To turn the instrument on: Press and release the red power On/Off key. During the software initiation the start-up and status screen (figure 5) will display the firmware version (e.g. V018-03 indicates issue 3 of the firmware) and the serial number followed by the screens listed below (figure 6): •... -
Page 13: Measurement Screens
620 Series To turn off the instrument: When the required measurements have been taken and in stop mode, press and hold the red power key for three seconds to switch off the instrument. The display will show a ‘3, 2, 1’ count down. - Page 14 620 Series If the Run Duration Timer is set, a ‘stopwatch’ (symbol 1 in figure 8) will appear next to the countdown timer. The Run Duration timer is enabled and disabled in Settings detailed later. If the Run Duration is not set, the run timer will count up until the run is stopped manually by...
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Page 15: Main Menu
620 Series Main Menu Access the ‘Main Menu’ (figure 11) from either of the two Stop screens by pressing the corresponding Menu soft key. • Settings allows changes to the instrument setup. • Memory allows viewing and deletion of stored results. -
Page 16: Set Up
620 Series Set UP This screen shows the default measurement parameters which will be displayed for a given ‘regime’ and changes settings like the time constant, (Fast or Slow), Exchange rate (Q=3, 4 or 5), LEQ or LAVG with its associated thresholds. -
Page 17: Language
620 Series Language The default language is UK English (see figure 16). Use the, , or navigation keys and the corresponding Select soft key to choose the language of your choice Press the corresponding Exit soft key to return to the previous screen(s). -
Page 18: Measurement Control
620 Series Measurement Control This new feature adds additional data sets which may be graphed as shown below (see figure 20). Use the or to navigate and the corresponding Edit soft key and , keys to select either 1, 2, 5, 10, 15,20,30 second or 1, 2, 5, 10, 15, 20, 30, minute profiles or Off to disable. -
Page 19: Run Duration
620 Series Run Duration This changes the way a run starts and stops either by a manual key press (see the Measurement Screens section) or for a selectable fixed run Duration. Press the corresponding Edit soft key and , to select either Off (manual start/stop) or On. -
Page 20: Voice Notes
620 Series Voice Notes Audio voice notes may be added prior to a measurement run (if selected) by speaking into the instrument microphone. The 2GB memory gives 33 hours of storage. Use the corresponding Edit soft key and the, keys to... -
Page 21: View Results
620 Series You can now see the individual run(s) for a given date in Figure 25. Again, use the or navigation keys to highlight the run of interest and press the corresponding Select soft key. Figure 25 You now have a series of further options as shown in figure 26. Use the, , or ... -
Page 22: Delete
620 Series Note: The Octave screens are only available on ‘B models’. Delete Use the or navigation keys to highlight an individual date to be deleted, or all the stored runs to date, and press the corresponding Select soft key. You will be asked to confirm that you want to delete or otherwise. -
Page 23: Status
620 Series Status Figure 27 is a repeat of the screen shown when the instrument is first switched on and displays: • Exact model variant • Date & Time • Number of measurement runs free • Free memory • Battery voltage ▪... -
Page 24: Connectivity
170mA via a 2.1mm Power Connector. The PC18 power supply is recommended (see Part Numbers and Accessories). The CEL-620 series acts as a removable storage device when connected to a PC by the CMC51 cable supplied. See figure 29 for the location of the USB connection. -
Page 25: Audio Socket
620 Series Audio socket An AC output is available via a 2.5mm stereo audio jack (Barrel ground, Tip AC output) provided for remote monitoring, DAT tape / PC wav file recording or headphone applications. The output level can be set Low or High see System Tools. -
Page 26: Calibration
620 Series Calibration Note: The Instrument must be at a STOP screen before the acoustic calibrator is fitted. It is recommended that an acoustic calibration using a CEL-120/2 (or CEL-120/1) calibrator is performed before and after taking measurements. To perform a calibration: Switch on the acoustic calibrator. -
Page 27: Technical Specifications
620 Series Technical specifications Technical area Specification Applicable Standards IEC 61672-1:2013 CEL-620B model only, IEC 61260 Class 1 Octave filters ANSI S1.4 - 1983 (R2006), ANSI S1.43 - 1997 (R2007) CEL-620B model only, ANSI S1.11-2004 (R2009) Total measurement range 20 to 140dB RMS (single range), 143.0 dB Peak Frequency weightings RMS &... -
Page 28: Additional Information Required For Testing
620 Series Additional information required for testing As required by IEC61672-1 section 9.3 a) Reference Sound Pressure Level The reference sound pressure level is selectable to be 94 dB or 114 dB. b) Reference Level Range The CEL-62X is a single level range instrument of 0 to 140 dB. - Page 29 620 Series Weighting 31.5Hz 1 kHz 4kHz 8kHz 12.5kHz 30 to 100 30 to 140 30 to 141 30 to 138 30 to 134 32 to 137 32 to 140 32 to139 32 to 136 32 to 132 38 to 140...
- Page 30 15 seconds after a 5kPa change in ambient pressure. m) Electric Field Strength Greater Than 10 V/m The 620 series has not been tested for field strengths greater than 10 V/m. n) EMC Emissions Emissions were no greater in any one plane or any mode of operation.
- Page 31 620 Series Casella CEL-620 with CEL-251 Microphone Free Field response with and without Wind Screen. Nominal Actual 0 Degree 0 Degree Effect of 0 Degree 0 Degree Expanded Frequency Frequency Free Field Free Field Wind Free Field Free Field uncertainty...
- Page 32 620 Series CEL-620 with CEL-251 Microphone directional response (dB) relative to zero degrees. Orientation of CEL-62X - Display at 0 degrees relative to ground. Nominal Actual Frequency Frequency (Hz) (Hz) 501.19 0.00 0.01 0.01 0.00 -0.02 -0.05 -0.09 -0.20 -0.20 -0.26...
- Page 33 620 Series CEL-620 with CEL-251 Microphone directional response (dB) relative to zero degrees. Orientation of CEL-62X - Display at 90 degrees relative to ground. Nominal Actual Frequency Frequency (Hz) (Hz) 501.19 0.00 0.00 0.00 0.00 -0.01 -0.03 -0.06 -0.11 -0.16 -0.21...
- Page 34 620 Series Sound Calibrators – Level Corrections Sound level calibrators apply sound pressure to a microphone in a closed cavity. The response of a microphone in a free field at 1kHz will be slightly different to that of a pressure field. Also some calibrators are affected by the volume of the microphone changing the volume of the calibrator cavity.
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Page 35: Declarations
Declarations UKCA & CE DECLARATION OF CONFORMITY Casella declares that this product is in compliance with the essential requirements and other relevant provisions of applicable UK and EC directives. A copy of the relevant Declaration of Conformity for this product may be obtained by clicking on the product compliance documentation link at www.casellasolutions.com. -
Page 36: Servicing, Maintenance And Support
Servicing, maintenance and support Servicing The CEL 620 series has no user serviceable parts with the exception of the microphone and if a fault is suspected, return the instrument to Casella or a Casella approved service centre. The warranty DOES NOT extend to cleaning or general servicing of the instrument. -
Page 37: User Notes
620 Series Accessory Part Description Number CEL-6840 Standard ‘K1’ kit case 206084D Executive kit case CEL-6841 Windshield CEL-120/1 Acoustic Calibrator Class 1 CEL-120/2 Acoustic Calibrator Class 2 CEL-6718 Lightweight tripod CEL-251 Microphone Class 1 CEL-252 Microphone Class 2 PC18 Universal power supply...
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