Final tests and Health tests 1

DESIGN OF THE HATCH OF THE INSTRUMENT BOOTH OF EUSO-BALLOON

version v1.2

Writer : SYLVIE DAGORET-CAMPAGNE

http://euso-balloon.lal.in2p3.fr/spip.php?article313

Final tests and Health tests 2

Purpose of the hatchThe hatch is a kind of box of 17 cm x 17 cm x 6 cm inside the top wall of the Instrument Booth.During final tests and health tests the electronics of the internal booth is connected to external equipment to shunt :• SIREN which may not be available• Batteries to spare the cellsLast checking tests are done to be sure the whole detector works as expected.

Hatch open

Final tests and Health tests 3

Hatch closed

• For the flight, the cables to external equipments are removed, SIREN is installed definitely inside the IB, the connectors are plugged with the terminal plugs, the hatch box is closed.

• The instrument works with SIREN and its own battery• The whole instrument booth (IB) has to be kept totally

watertight even if splash fall in water

Hatch closed

Final tests and Health tests 4

Cables having to pass through the hatch

• The cables from both side are connected through a series of feedthrough connectors passing through the wall of the hatch box.

• During the tests the active subsystems of IB are connected to the external equipments and for flight, the external cables are removed, the internal cables are kept in place and the feedthrough connectors inside the hatch box is ended by plugs.

Final tests and Health tests 5

List of feedthrough

name subsystem equipment type comment

LED Led Stabilised voltage supply

Lemo or BNC FS illumination

PM Anode Ext PM Scope Lemo or BNC Light leakage

PM HV Ext PM HV BNC

PDM-B PDM-B Int PC-USB-PDM USB2

CPU-ExtTrig CPU Trigger generator

Lemo or BNC

CPU-Eth CPU PC-Ethernet-CPU

DB9

SIREN-Eth SIREN DB9 In flightLoop back toward CPU-Eth

SIREN-RS232/422

SIREN DB9 In flight loop back HK RS422

SIREN-Open Drain

SIREN Lemo or BNC In flight loop back LVPS-HK

LVPS-HK Open Drain

LVPS-HK Signal generator ?TBC

Lemo or BNC

HK-RS422 HK PC-RS422-CPU DB9

PWP PWP 28 V Power supply

MicroSUBD25 Allow to switch between external geenrator and batteries

Motor Motor Motor Cpntrol SUBD25 TBD

6

LED

PDM-B NI

HATCH BOX

HATCH BOX

BNC BNC

USB USB

CPUExternal TrigEthernet DB9 DB9

DB9 DB9SIRENEthernet

RS232Open Drain

ComputerPDM Soft

LED Power supply

BNC BNC

plug

Ext Trig

ComputerDP Soft

DB9 DB9

LVPS-HKOpen Drain

RS232/RS422

DB9 DB9HKRS422

Instrument booth

BNC BNC

BNC BNC

plug

ComputerHK Soft

AnalogTurn ON

ExternalTest equipment

SUBD

-25

SUBD

-25Batteries

SUBD

-25

SUBD

-25

plug

ExternalPowerSupply28 V, 5 Amp

Motor SubD25 SubD25 Motor control

Ext PM BNC

SHV SHV

BNC

PM HV

Scope

7

LED

PDM-B NI

HATCH BOX

HATCH BOX

BNC BNC

USB USB

CPUExternal TrigEthernet DB9 DB9

DB9 DB9SIRENEthernet

RS232Open Drain

BNC BNCplug

DB9 DB9

LVPS-HKOpen Drain

RS232/RS422

DB9 DB9HKRS422

Instrument booth

BNC BNC

BNC BNC

plug

IN

Flight

SUBD

-25

SUBD

-25Batteries

SUBD

-25

SUBD

-25

Motor subD25 SubD25

Ext PM BNC

SHV SHV

BNCplug

Final tests and Health tests 8

Hatch Panel Design

Final tests and Health tests 9

BACKUP

Final tests and Health tests 10

LED

For Final Tests and Health Tests:

• This is to put a stabilised voltage for pulsing with photons the PDM FS.

• The feedthough has to be of good quality to avoid water entering inside the instrument.

• Integrating sphere optional

Final tests and Health tests 11

External PMT

For Final Tests :The purpose is to check there is no light leakage inside the Instrument booth.

• Need to feed the voltage divider by HV (BNC-SHV)

• Need to read the anode with lemo/BNC

May be kept in-situe for health test to check LED is pulsing correctly

Final tests and Health tests 12

PDM-B• This is to read the PDM-B directly on a PC to

perform special studies that shunt the DP.

• This is optional but probably usefull for debugging during final tests (not health tests).

• It is possible to select the Data Output of the PDM-B by a command from DP.

• This requires to have the NI inside the IB (instrument booth).

• The question is can we find a watertight USB plug for flight

Final tests and Health tests 13

CPU

Ethernet• To be watertight the usual RJ45

Ethernet connector will not be used. We should use a DB9 feedthrough.

• In Flight : A plug DB9 is used to loop back to SIREN Ethernet.

External Trigger• For final tests, like PDM-FS position

adjustment with a motor, the CPU-DAQ is triggered externally

• A BNC/lemo is proposed with the most watertight solution proposed.

Final tests and Health tests 14

HK

RS422 :

• We will use a DB9 feedthrough (watertight).

• In Flight : A plug DB9 is used to loop back to SIREN RS422/RS232.

Final tests and Health tests 15

LVPS-HK

• This is the port through which the instrument start to be turned on.

• This is an analog signal on open drain from a dedicated SIREN output.

• The proposed connection is through BNC/lemo (depending on watertightness)

• This connection is doubled to loop back from SIREN to LVPS HK during the flight

Final tests and Health tests 16

Motor

• DB25 connector is enough

Final tests and Health tests 17

Open points

• The hatch panel has still to be confirmed in the 15th meeting

• The choice of the feedthrough has to be done according compromises on:– Price/ connector quality– Full Water tightness for sea landing– Reusability during the same flight

campaign• No idea about the turn on off

HVPS ?