AV HUD-A Bedienungsanleitung

HUD-A

HEADS-UP DISPLAY

MANUAL

(revision 1/2015)

2015

CONTENTS

1.!INTRODUCTION,.......................................................................................................................................................,3!

2.!TECHNICAL,CHARACTERISTICS,.........................................................................................................................,3!

3.,,,,,TECHNICAL,DESIGN,................................................................................................................................................,4!

4.,,,,,SWITCHING,ON,AND,START,OF,WORK,............................................................................................................,4!

5.,,,,,PO2,DISPLAY,MODE,...............................................................................................................................................,5!

6.,,,,,CALIBRATION,...........................................................................................................................................................,7!

7.,,,,,JOINT,OPERATION,WITH,AV1F,AND,AV1ECCR,.............................................................................................,8!

8.,,,,,STORAGE,.................................................................................................................................................................,10!

1. Introduction

Heads-up display HUD-A (further - HUD-A) – fully autonomous device for PO2

indication and conrol via 3 independent channels. The device can operate with

standard oxygen cells, providing output voltage in the range of 5-30mV in the

open air at standard atmosphere pressure.

2. Technical characteristics

Number of measuring channels / indication: 3

PO2 measurement accuracy: 0.1 bar

Indication: 3 channels with 5 LEDs each

Independent indication: 2 LEDs (red and green) with connection to AV1f or

AV1eCCR

Battery: AAA battery 1.5V

Uninterrupted operation duration: not less than 100 hours

Tested depth: 250 meters

Calibration: air or oxygen

Operation temperatures range: -10С..+45С

Dimensions: diameter 24mm; length 80mm

Channels’ input impedance: 50kOhm

3. Technical Design

1. Hi-resistant polycarbonate protective display

2. Wet contacts

3. Sealed cable

4. Two sealing O-rings

4. Switching On and Start of Work

To start the work turn off the protective display 1 and insert AAA

battery 1.5V into the slot (mind the polarity!).

Ensure that sealing O-rings 4 are clean and are not damaged.

Lubricate them with a thin layer of silicone grease prior to placing the

protective display back.

HUD-A will automatically switch on and internal testing will start upon

inserting the battery. In case of successful testing all indicator LEDs

will flash three times.

and battery charge level will be displayed for a few seconds.

Replace the battery, if the charge level is lower than yellow LED.

Upon testing completion HUD-A will move to PO2 display mode.

HUD-A will automatically switch off on surface in case of staying

inactive for 3 min 30 sec.

30 seconds before switching off the device will warn about this with

intense LEDs’ flashing.

To switch the device from sleeping mode it's recommended to close

wet contacts 2 with any metallic subject or by a wet finger.

In underwater mode HUD-A will also immediately switch on.

5. PO2 display mode

Matrix of 3 columns with 5 LEDs each is used to display PO2 in HUD-

A. Each LED can either beam uninterruptedly, or flash with 1Hz

frequency. Each of 3 columns displays PO2 of each own channel in

accordance with the table.

РО2

Indication

<0.2

Low red is flashing

0.2...0.45

Low red is glowing

0.45...0.65

Low red is glowing

Yellow is glowing

0.65...0.75

Yellow is glowing

0.75...0.85

Yellow is flashing

0.85...0.95

Yellow is glowing

Blue is glowing

0.95…1.05

Blue is glowing

1.05...1.15

Blue is flashing

1.15...1.25

Blue is glowing

Green is glowing

1.25...1.35

Green is glowing

1.35...1.45

Green is flashing

1.45...1.55

Green is glowing

Red is glowing

1.55...1.65

Red is glowing

>1.65

Red is flashing

6. Calibration

To switch calibration on it is recommended to close wet contacts 3

times in the PO2 indication mode within 1.5 seconds.

This will require some skill, and possibly, you will not succeed from

the first trial. Try several times.

This procedure is designed on purpose to avoid any possibility of

calibration mode switch on by mistake when swimming on surface.

When switching calibration mode on HUD-A will display one of two

calibration options: by air or by oxygen.

In case of choice of calibration by air figures 2 and 1 will alternatively

flash with 2Hz frequency.

In case of choice of calibraton by oxygen figures 9 and 8 will

alternatively flash.

To switch between 2 options – single short closing of wet contacts.

Upon choosing the calibration option mode close wet contacts for 1

second to start calibration process.

Upon this indicator will intensely flash, and calibration process will

start. Upon successful calibration HUD-A will automatically switch to

PO2 indication mode and store the calibration coefficients in a

nonvolatile memory.

7. Joint operation with AV1Fand AV1eCCR

HUD-A has 2 separate independent LEDs (red and green) to connect

the device as a common dependent HUD. There indicators does not

depend either on HUD-A electronics or on the inside, and are

managed exclusively by the external dive computer.

ATTENTION! IMPORTANT!

HUD-A does not have pressure sonsor. Calibration is done

based on the assumption that ambient pressure is equal to

1,000 mbar. When calibrating is done in high-altitude

conditions or at low ambient pressure, PO2 indications will be

higher as pro rata.

When calibrating at ambient pressure equal more than 1,000

mbar, PO2 indications will be higher as pro rata.

Take into account this information when planning your dives!

HUD-A connection scheme:

ATTENTION! IMPORTANT!

When connecting HUD-A to the rebreather it is strongly

forbidden to cut off sealed cable end 3. This cable end is an

integral part of HUD-A. Its damage can affect the device’

operation and put HUD-A out of order.

10!

8. Storage

With long intervals of usage it is recommended to take the battery off

to avoid complete discharge and electrolyte leakage.

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