Echo Intensity Calibrations

Erc: Noise counts

K1: Power into the water (W)

K2: Noise figure

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SN 382		Erc		K1		K2
Beam 1		32		3.89		3.18
Beam 2		33		4.66		2.99
Beam 3		35		4.07		3.19
Beam 4		37		4.19		3.08

Calibration done in April 1998
David Starr Jordan transducer prior to 2/1998

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SN 275		Erc		K1		K2
Beam 1		27		10.97		1.64
Beam 2		21		11.11		1.55
Beam 3		32		12.19		1.83
Beam 4		21		13.38		1.74

Calibration done in December 1997
David Starr Jordan transducer post 1/1998

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SN 73		Erc		K1		K2
Beam 1		-		7.669		2.871
Beam 2		-		8.214		2.723
Beam 3		-		7.877		2.381
Beam 4		-		8.359		2.229

Calibration done in June 1996
New Horizon transducer for multiple cruises in 1996-2002

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SN 173		Erc		K1		K2
Beam 1		-		10.715		2.128
Beam 2		-		10.562		2.244
Beam 3		-		10.127		1.888
Beam 4		-		9.919		3.690

Calibration done in July 1997
used on New Horizon in 1994 (nh9410);
currently on Roger Revelle (9901, 0304)

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SN 532		Erc		K1		K2
Beam 1		-		8.752		2.871
Beam 2		-		9.525		2.564
Beam 3		-		11.605		2.009
Beam 4		-		10.206		2.104

Calibration done in August 1997
presently on Melville. (AUCE, me0302)

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© 2008 Scripps Institution of Oceanography