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Song Meter SM4M User Guide Supplement

4 Specifications

Wildlife Acoustics, Inc.

page

4.5

Hydrophone Response and Noise Charts

Testing was completed and certified by the National Physical Laboratory in the UK.

NOTE:

The dip in response at 2 kHz is caused by resonance in the housing and can be

avoided with a cabled hydrophone available for special order.

Noise Power Spectral

Density for Acoustic Model.

Noise Power Spectral
Density for Ultrasonic
Model.

-178

-176

-174

-172

-170

-168

-166

-164

-162

-160

nsitivity (dB r

e 1V

/µ

Pa)

Frequency (Hz)

System Frequency Response of Hydrophone Options

Ultrasonic
Standard

Содержание SM4M

Страница 1: ...enetr Song Meter SM4M B I O A C O U S T I C S R E C O R D E R Last updated on September 7 2017 ...

Страница 2: ... and Removing SD Memory Cards 8 2 5 Estimating Battery Life 9 2 6 Estimating Memory Requirements 9 2 7 Deploying the Recorder 11 2 8 Anchoring Solutions 15 2 9 Retrieving and Servicing the Recorder 17 3 SM4M Specific User Guide Notes 19 3 1 Setting Gain 19 3 2 Deactivating Scrubber on Ultrasonic Models 19 3 3 Recording Behavior 20 3 4 Measuring Hydrophone Sensitivity 20 4 Specifications 21 4 1 Phy...

Страница 3: ...aded from http www wildlifeacoustics com support documentation The SM4 SM4BAT User Guides are also available from the same webpage in Spanish French German Chinese and Japanese translations Tutorial Videos Visit http www wildlifeacoustics com support tutorial videos to view tutorial videos for the SM4 and SM4BAT Contacting Support For issues or questions not addressed in this guide contact the Wil...

Страница 4: ...pt 64 D sized batteries The recording electronics are identical 1 4 AcousticandUltrasonicModels The SM4M is available in two versions Acoustic or Ultrasonic The Acoustic version is designed to be used with the Acoustic Hydrophone option for monitoring non ultrasonic marine mammals and quantifying ocean noise It can record sounds up to 48 kHz It is a two channel recorder so it can additionally be f...

Страница 5: ...f the other hydrophones in a dual hydrophone configuration the unit can record quiet or distant sounds from any source including marine life with one hydrophone and at the same time accurately record and quantify very loud sounds from anthropogenic sources with the High SPL The sensitivity of each hydrophone is calibrated to a 0 1 dB resolution by the hydrophone manufacturer This value appears on ...

Страница 6: ... At the top of the board are the SM4 or SM4BAT module which contains the LCD display user interface buttons SD card slots power switch and GPS accessory port 1 Storage Case Rugged storage case protects the equipment and offers convenient handles and wheels for reliable transport ...

Страница 7: ...otect seals against water 5 Spanner Wrenches Set of two identical wrenches allow installation and removal of the threaded top cap 1 7 PressureReleaseValve A pressure release valve is installed on the top cap next to the hydrophone The pressure release valve prevents dangerous pressure build up greater than 10 PSI within the enclosure by releasing air though the valve No maintenance is required to ...

Страница 8: ... StorageandTransport The SM4M ships in a rugged case suitable for storage and shipment The case has wheels on one end for ease of travel and two latches which can accept locks for security The spanner wrenches O rings lubricant desiccant and other needed supplies can also be stored inside ...

Страница 9: ...not mix old and new batteries 1 Remove the top cap 2 Pull the battery board from the housing using the large finger hole at the top of the board 3 Press STOP to stop the current recording schedule This step may be unnecessary if the batteries are depleted or the memory cards are full 4 Remove the old batteries 5 For SM4M Submersible models insert at least 8 and at most 32 new size D batteries of t...

Страница 10: ...are or import or export a Schedule 1 In a dry environment remove the top cap 2 Pull the battery board from the tube 3 Press STOP to stop the current schedule 4 Insert one or two memory cards by lightly pushing in until each card is secure Use memory card slot A when you want to update the firmware or import or export a Schedule TIP Insert multiple SD memory cards to take advantage of failover capa...

Страница 11: ...life and memory card utilization given your specific recording schedule and configuration 2 6 EstimatingMemoryRequirements Ultrasonic Recording Generally ultrasonic recordings will be made utilizing the trigger function so that the recorder is not constantly recording and quickly using up card space How long any given card s will last is dependent on ultrasonic activity so some Version Sampling Ra...

Страница 12: ... 1111 2222 128 GB 185 370 403 555 741 806 1111 2222 4444 256 GB 370 741 806 1110 1482 1613 2222 4445 8889 512 GB 741 1481 1613 2221 2963 3226 4444 8889 17778 Estimated Recording Time in Hours 2 channel Stereo WAV 96 000 48 000 44 100 32 000 24 000 22 050 16 000 8 000 4 000 8 GB 6 12 13 17 23 25 35 69 139 16 GB 12 23 25 35 46 50 69 139 278 32 GB 23 46 50 69 93 101 139 278 556 64 GB 46 93 101 139 18...

Страница 13: ...g When the top cap is tightened this holds the board in place and prevents movement during deployment 2 Slide the battery board down into the recorder cylinder 3 Plug the cable into either channel connector or both if using two hydrophones The Ultrasonic Version will have only one connector Perform a Pre Deployment Test At this point it is prudent to run a final system test 1 Verify that you insta...

Страница 14: ...p 4 Store remaining desiccant packs in air tight resealable storage bags to prevent them from absorbing moisture Prepare the Top Cap It is extremely important that the O rings are clean free of defects and properly lubricated The housing is sealed using two O rings on the top cap This is a redundant system Only one O ring is necessary to seal but two are used to ensure a seal if one should become ...

Страница 15: ...y place the cap into the tube opening Verify that the cap is level 3 In a single counterclockwise rotation you should feel the cap fall into place with a click At this point the beginning of the threads are mated properly and the cap can then be installed by slowly rotating clockwise to tighten the cap onto the tube 4 Rotate by hand to tighten the cap a couple turns to get it started When the firs...

Страница 16: ...hold the housing wrench stationary and rotate the top cap moving to a new hole as it is tightened NOTE The wrenches are identical They rotate in opposing directions to create a seal inside the threaded enclosure Be careful to orient the wrenches as shown Operating them backwards can easily break the small tabs 6 Apply symmetric downward force as shown below to tighten 7 Make six 6 more rotations T...

Страница 17: ...ure the Pressure release valve is hand tight 2 8 AnchoringSolutions The SM4M Submersible model shown at left below can be anchored from the stainless steel eyebolt on the bottom of the housing For the Deep Water Model shown at right below there is a mounting bracket welded on the bottom ...

Страница 18: ...ch allow the unit to be released from the ocean floor by playing an acoustic signal from the surface In this case it is necessary to use a subsea float to increase the visibility of the housing when it surfaces The Deep Water unit is not positively buoyant with any batteries installed and will need additional flotation to return to the surface on its own NOTE All metal hardware used on the SM4M is...

Страница 19: ...hes After a long underwater deployment especially in shallow water the unit may have accumulated significant biofouling 2 Insert the spanner wrenches in the top cap side holes NOTE When sealing and removing the top cap downward force is applied however the spanner wrenches are reversed When unsealing the cap the top wrench extends to the right and the lower wrench extends away from the cylinder to...

Страница 20: ... cylindrical housing especially where the O rings make contact 5 Discard the desiccant pack It is not reusable and must be replaced before every deployment 6 Inspect the entire unit for damage to the housing attachment points or hydrophone 7 Verify that the hydrophone is still tightly secured to the top cap The bottom of the hydrophone connector should make contact with the surface of the top cap ...

Страница 21: ... 240dB SPL There is no reason to use additional gain as both hydrophones are fully covering the available dynamic range Further gain will not allow recording quieter sounds due to the self noise of the standard hydrophone Preamplifier Gain in Audio Settings section of SM4 User Guide This gain only affects the built in microphones of the SM4 unit and it will have no effect on the SM4M Ultrasonic Ga...

Страница 22: ...late To compensate the SM4M automatically extends the duration of the recording so it will finish on time to keep to the schedule In this scenario it is normal to see a delayed start time and a shorter recording 3 4 MeasuringHydrophoneSensitivity We include this section because all SM4 models support this functionality however this procedure is not intended for use with hydrophones though it could...

Страница 23: ... 20 C to 50 C SM4M Deep Water Length Height 58 3 in 148 cm includes bottom bracket and hydrophone cage Diameter 6 5 in 16 5 cm Mounting Bracket Slots 1 5 in 3 8 cm high 3 0 in 7 6 cm wide Weight air 53 8 lb 24 4 kg without batteries 71 lb 32 2 kg with 64 batteries Buoyancy salt water 2 2 lb 1 kg without batteries 21 6 lb 9 8 kg with 64 batteries note negative buoyancy with batteries Rated Depth 3 ...

Страница 24: ...6 bit PCM wav Analog to Digital Converter Full scale 0 707V rms 2v p p Supported Sample Rates Hz 8000 12000 16000 22050 24000 32000 44100 48000 and 96000 Amplifier Gain 0 0 59 5 dB in 0 5 dB steps High Pass Filter Selectable 2 pole at 220 Hz or 1 kHz Anti Alias Filter Performance Fraction of Sample Rate Anti Alias Filter Gain dB 0 to 0 39 0 1 0 4125 0 25 0 45 3 0 0 5 17 5 0 55 75 0 Ultrasonic Mode...

Страница 25: ...in the UK NOTE The dip in response at 2 kHz is caused by resonance in the housing and can be avoided with a cabled hydrophone available for special order Noise Power Spectral Density for Acoustic Model Noise Power Spectral Density for Ultrasonic Model 178 176 174 172 170 168 166 164 162 160 Sensitivity dB re 1V µPa Frequency Hz System Frequency Response of Hydrophone Options Ultrasonic Standard ...

Страница 26: ...throughtheendoftheoriginalwarranty whicheverislonger OBTAINING WARRANTY SERVICE Customer should refer to the WAI website at www wildlifeacoustics com support contact support for information on obtaining warranty service authorization Methods for obtaining warranty service may vary dependingonwhetherpurchasesweremadefromanauthorized provider of WAI products or from WAI directly All requests for war...

Страница 27: ...sed in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interferenceinwhichcasetheuserwillberequiredtocorrectthe interferenceathisownexpense Changes or modifications not expressly approved by Wildlife Acoustics Inc could void the user s authority to operate the equipment Note U...

Страница 28: ...ice SM4 SM4BAT and SM4M are trademarks of Wildlife Acoustics Inc SDHC and SDXC Logos are trademarks of SD 3C LLC All other trademarks are the property of their respective owners The Song Meter is patented U S Pat No 7 782 195 Additional U S and international patents and trademarks are pending Wildlife Acoustics Inc 3 Mill and Main Place Suite 210 Maynard MA 01754 978 369 5225 or toll free in the U...

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