5
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 d
isplay 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.
