Valeport Va500 Manual de usuario

VA500 Altimeter Manual Page 1 0430831e_VA500_Altimeter_Manual

VALEPORT LIMITED

VA500 Altimeter

Operating Manual

Document Ref: 0430831

Document Version: E

Date: September 2012

This confidential document was prepared by the staff of Valeport Limited, the Company, and

is the property of the Company, which also owns the copyright therein. All rights conferred

by the law of the copyright and by virtue of international copyright conventions are reserved

to the Company. This document must not be copied, reprinted or reproduced in any material

form, either wholly or in part, and the contents of this document, and any method or

technique available therefrom, must not be disclosed to any other person whatsoever

without the prior written consent of the Company.

Valeport Limited, Tel: +44 (0)1803 869292

St Peters Quay, Fax: +44 (0)1803 869293

Totnes, e-mail: sales@valeport.co.uk

Devon, TQ9 5EW, Web: www.valeport.co.uk

As part of our policy of continuous development, we reserve the right to alter, without prior

notice, all specifications, designs, prices and conditions of supply for all our equipment.

VA500 Altimeter Manual Page 2 0430831e_VA500_Altimeter_Manual

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VA500 Altimeter Manual Page 3 0430831e_VA500_Altimeter_Manual

1 INTRODUCTION

The VA500 altimeter has been designed with the objective of providing an accurate, reliable

and robust measurement of range from surface and underwater platforms. State of the art

signal processing offers unrivalled range and performance from a 500kHz transducer.

Millimetre precision, 0.1m –100m range, RS232/RS485/0-5V & 0-10V analogue outputs with

a wide range power supply address the needs of the ROV, AUV and Hydrographic

community in a compact, robust package.

The option of integrating a high accuracy pressure sensor (0.01%) as used in the MiniIPS

offers an unbeatable package for your underwater positioning requirements.

VA500 Altimeter Manual Page 4 0430831e_VA500_Altimeter_Manual

2 SPECIFICATIONS

2.1 ACOUSTIC

State of the art signal processing technology provides stable, repeatable readings while

allowing the range to be extended to unrivalled distances for a 500kHz altimeter.

Type: 500 kHz broadband transducer

Range: 0.1m –100m

Resolution: 1mm

Beam Angle: ±3

2.2 PRESSURE

The optional pressure sensor fitted to the Altimeter is a temperature compensated piezo-

resistive sensor, which delivers the performance previously only available from a resonant

quartz sensor at a more cost-effective price.

Type: Temperature compensated piezo-resistive

Range: 10, 30, 100, 300 or 600 Bar

Accuracy: ±0.01% FS

Resolution: 0.001% FS

2.3 DATA ACQUISITION

Sampling: Continuous or data on demand (by serial command/TTL trigger).

Data Rate: 1, 2, 4 Hz

2.4 COMMUNICATIONS

RS485 is enabled by grounding a pin in the communications lead, See section 6

Digital Output: RS232 & RS485 fitted as standard

Protocol: 4800 to 115200 baud, (8,1,N)

Formats: Valeport NMEA / Tritech / Kongsberg / $SDDBT NMEA

Analogue output: 0-5/10V fitted as standard

2.5 POWER REQUIREMENTS

Input: 9 - 28vDC (isolated power supply)

Power: <125 mA @ 12V

2.6 PHYSICAL

Housing: Titanium (6000m rated)

Size: 48mm max Ø

43mm main body Ø

215mm length (including connector)

248mm length with pressure fitted

Weight: 0.95 kg (air)/ ~0.7 kg (in water)

Connector: Subconn MCBH10F (titanium)

VA500 Altimeter Manual Page 5 0430831e_VA500_Altimeter_Manual

Figure 1: VA500 Altimeter dimensions

VA500 Altimeter Manual Page 6 0430831e_VA500_Altimeter_Manual

3 CONFIGURATION + OPERATION

The VA500 is supplied with a Valeport Terminal, a terminal communications program and

configuration tool designed specifically for use with Valeport instruments.

Install the program by opening the install package on the supplied CD and follow the on

screen instructions. Once installed, Launch the terminal program

3.1 USING THE CONFIGURATION WIZARD

Valeport Terminal can be used to

manually connect and configure

the VA500 or can be used in the

configuration wizard mode.

Click on the configure button to

launch the wizard.

Select the COM port the

VA500 is connected to.

The wizard is configured

with the default settings of

the unit but can be altered

if the unit has been

modified.

VA500 Altimeter Manual Page 7 0430831e_VA500_Altimeter_Manual

Default ASCII settings are

preconfigured and should

not need changing.

Select the VA500 altimeter

from the dropdown list.

Select the Read

Configuration from the

instrument to determine

current settings

Open previously saved

configuration file to load a

predefined setup.

VA500 Altimeter Manual Page 8 0430831e_VA500_Altimeter_Manual

The first wizard screen will

give information about the

instrument. These are

settings that are set at the

factory.

The next page defines:

Communications settings.

Analogue mode and

limits.(See wiring schedule

in section 6 for analogue

outputs)

Anaologue range can be 0-

5V or 0-10V

Analogue limit is the

distance that equates to

full scale voltage output.

Serial Data format (see

data format section for

definition of formats)

VA500 Altimeter Manual Page 9 0430831e_VA500_Altimeter_Manual

The next page defines:

Output units, can be

seconds, metres, feet or

fathoms.

Minimum range allows

fixed returns close to the

VA500 to be filtered out.

Maximum range allows

filtering of spiking in noisy

environments or in the

presence of multiple

echoes.

Sound speed is set to

1500m/s. To improve

accuracy then the local

sound speed should be

measured and applied

here.

Error is the value returned when no echo is detected or it is outside the minimum and

maximum ranges defined.

If the Altimeter is fitted

with the optional pressure

sensor, this can be

configured here.

Units can be dBar, metres

or feet.

Tare allows the pressure

sensor to be zeroed to

atmospheric pressure.

Latitude is used in the

conversion from pressure

to depth.

VA500 Altimeter Manual Page 10 0430831e_VA500_Altimeter_Manual

Continuous output rates

can be 1,2 or 4 Hz

Alternatively the VA500

can be triggered with a

serial command (S

followed by a carriage

return) or via TTL (see

wiring schedule in section

Once configuration is

complete, the wizard will

summarise the commands

to be sent to the

instrument.

The configuration can also

be saved to file for later

use or reference.

If the Run mode checkbox

is ticked the instrument will

start outputting data into

the terminal window behind

once the configuration is

complete.

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