PMEL Acoustics Program logo National Oceanic and Atmospheric Administration Pacific Marine Environmental Laboratory Acoustics Program
  Moored Autonomous Hydrophones: System Diagram and Model Comparisons
  case diagram  
  This diagram shows the current configuration of the Model 3 autonomous hydrophone. A comparison and listing of the components of the three hydrophone models can be found below.  
     
System Parameter
Model 1
Model 2
Model 3
Data Logger
Supply Current 1kHz sampling rate @15V
18 mA
18 ma
6.8 ma
.
250 Hz sampling rate @15V
-
-
4.2 ma
.
100 Hz sampling rate @15V
6.5 ma
6.5 ma
3.5 ma
.
Maximum Sampling Rate
2 kHz
2 kHz
5 kHz
.
Hard Disk
2.5" 1GB
2.5" 1GB
2.5" 8GB
.
Number of Hard Disks
4
4
4
.
Maximum Data Storage
4 GB
4 GB
32 GB
.
Resolution
8 or 12-bit
8 or 12-bit
8 or 12-bit
.
Bytes per Data
1or 2 bytes
1 or 2 bytes
1 or 2 bytes
.
File Size
2 MB
2 MB
20 MB
.
File Format
Raw Data File
Raw Data File
DOS FAT16 compliant
.
Data Gap between files
~25 seconds
~25 seconds
None
.
Main Processor
Onset Model 7
Onset Model 7
CF1 from Peripheral Issues
.
.
.
.
.
Clock
Supply current @15 V
2.1 ma
2.1 ma
2.1 ma
.
Stability (-55 to +85 deg C)
3 x 10 E-08
3 x 10 E-08
3 x 10 E-08
.
Clock Synchronization
GPS
GPs
GPs
.
Output
1 PPS and 100 PPS
1 PPS and 100 PPS
1 PPS and 100 PPS
.
.
.
.
.
Pre-Amp
Supply Current
2.3 ma @+12V
2.3 ma @+12V
4 ma @12V
.
Frequency Range
1 to 42 Hz
1 to 50 Hz
2 to 440 Hz
.
Low-Pass Cut-off
42 Hz
50 Hz
Programmable
.
Gain (see gain figure)
4 settings
4 settings
Programmable
.
Pre-whitening filter
4 settings
4 settings
4 settings
.
Signal Input
Single
Single
Differential
.
Signal Output
0 to 5V
0 to 5V
0 to 4V