5V PS Input Voltage SweepCharacteristics

Power system Measurement

5VPS Voltage ripple - without load



5VPS Voltage ripple - with expected load

PC Electronic Test

LPI RAS radiosonde schematics

Ionizing tubes - measurements

YELLOW - output LOGIC, RED - PRIMARY single-event IONIZ. tube, BLUE coinc.telescope IONIZ. tube

Single event trigger measurement

Both tube coincidence signal - telescope event

single event- output logic 700us VS. coincidence event – output logic 1400us.

2nd tube radionuclide test - events

Primary tube radionuclide test

background

primary tube radionuclide test

Box Manufacturing

uC UNIT Schematic Update

Added: connectors, Status LED

uC UNIT PCB

BOTTOM Layer


TOP Layer

uC UNIT PCB

HVandSDC PCB

BOTTOM Layer

TOP layer

HVandSDC PCB

HV and SDC PCB design

PCB layout
dimensions are in mils [1mil/40=1mm]

Bill of Materials for HVandSDC

Revised: Sunday, June 28, 2009
Revision:
Bill Of Materials June 28,2009 14:13:22
Item	Quantity	Reference	Part	Note
__________________________________________________________________________________________________________________________________
1	2	C1,C7	100n/1000V
2	22	C2,C4,C8,C10,C12,C13,C14,C17,C19,C22,C23,C27,C28,C29,C31,C37,C40,C42,C43,C47,C48,C49	100n	ceram ~40V
3	1	C3	1m/35V	elyt
4	1	C5	10n/1000V
5	1	C6	200n/1000V
6	1	C9	50n	ceram ~40V
7	5	C11,C39,C41,C45,C46	100u/35V	elyt
8	4	C15,C30,C44,C50	100u/16V	elyt
9	6	C16,C21,C24,C25,C26,C36	10u/16V	elyt
10	5	C18,C20,C32,C34,C38	150p
11	1	D4	Zenner 6.2 V
12	1	D6	Zenner 4.7 V
13	5	D1,D2,D3,D5,D8	1N5408
14	1	D7	1N4700
15	1	F1	4A	GME: E-CH10 500V gG 4A
16	1	J1
17	1	J2	Spark Plug
18	1	J3	ARM PLUG
19	1	J4	BATTERIES
20	1	J5
21	1	J6	Digital I/O
22	1	L1	470uH	min 1A, toroid
23	4	L2,L3,L4,L5	10uH	min 0.5A, axial
24	3	R8,R9	10k
25	1	Q1	BC337
26	1	Q2	BC237
27	1	Q3	BC546
28	3	R1,R17,R19	1k
29	1	R2	1meg	HV
30	3	R3,R5,R6	0	see Item 28
31	1	R4	5k
32	1	R7	2.7meg	1000V (serial combination with R3,R5,R6)
33	5	R10,R12,R15,R16,R18	100R
34	1	R11	470R
35	1	R13	4.7k
36	1	R20	400k
37	1	U1A	tl497
38	2	U2,U6	ADuM1100	Order in Analog Devices !!!
39	1	U3	7404
40	1	U4	AD741
41	1	U5	TS555
42	1	U7	LM7805
43	1	U9	LM7808
44	1	Z1	BUP313
45	1	P1	10k	R Trimmer/ Multi-Turn; GME: 64 P 10K (http://www.gme.cz/cz/index.php?product=112-264)

Complete schematic for HV and SDC PCB design

HV Source Final Design

Modified: timming capacitor C10 -> 50nF
feedback values
Added: connectors
digital insulation
filters
safety OFF mechanism
LED indicators

Structure model-testing

Fixing into the Gondola

SOFTWARE LAYOUT

Spark Detection Circuit Update

Added VDD=8V for OA
Added Zener diode 4.7V D3 for OA's LOW output voltage shifting

Project Planning Update

ROBUST shiny metal EXPERIMENT MECHANICAL STRUCTURE

High Voltage Spower Supply Test

input voltage 12 VDC; current drain 250 mA
output voltage 800V
input voltage change +- 2 V => output voltage change +-10V
load 10Mohm => 5V shift
output voltage ripple +-2V

Spark Detection Circiut Test

Upper Trace(CH1): Discharge Voltage
Lower Trace(CH2): Spark Det. Logical Signal

Upper Trace(CH1): Discharge Voltage
Lower Trace(CH2): Spark Det. Logical Signal

Log. signal delay: 1.25us

Medipix@ATLAS

=> Lot of important data foreseen for analyses in synergy with our balloon experiments and potential scientific satellite applications!

http://pcatdwww.cern.ch/local-server/pc-medipix-01/devices/

New Ionisation Measurement Concept

...was proposed.
Measuring few points of V-A Chart before a spike => no EMC interferences.
HV ~ 100V digitally adjustable
- uC unit will have an extra dig. outputs
- HV PS will have an D/A converter in the feedback for adjustment

Current measurement by a TIA (with integration)

Double shielding will be still necessary but now in opposite way.
Electrodes: 100x100 mm

TO DO list:

- JOSHY time schedule and task interest

- funding (Vasa, SSC)

- ion concept discussions - Spanel, Svoboda, UTEF...

- STANDARD radiosonde detailed info from LEBEDEV inst.

industrialPC-uComp interface

pending decision about:

incorporating reset function into uControler having two separate ETH interfaces through E-link, 

OR

using single ETH on indPC, uControler connected to serial to it (indPC) WITH TESTED WATCHDOG function

Project Planning

PDR documents sent out

CRIndIons SED and PDR presentation sent to ESA.

3D model

updated version

ESRANGE provided battery source confirmed

A 28V/1A battery power will be supplied to each experiment if needed. The experiment

must have a 4 Pin connector type MIL – C-26482P series 1, placed on the outside of the

structure / housing.

If the experimenter chooses to use some other electrical system or batteries, it has to be

discussed with the BEXUS project manager before the critical design review (CDR).

Breakdown voltage environmental dependences

From easy calculations based on Paschen's law (i.e. WIKI) 5.7mm is the optimal effective distance of our spark-plug electrodes to obtain best results having available just max 800V potential. 

This graph is for parallel electrodes separated by 2.5cm. Find on figure for air 1 torr=133.3Pa) expected lowest pressure during flight will be ~ 0.1 Torr so well in our range. Max (ground) pressure ~700 Torr so we can effectively operate from on almost whole range with optimal 5.7mm distanceand from ~10km up higher even with 2.5cm distant electrodes.

More interesting, dependences on temperature and humidity as well> http://home.earthlink.net/~jimlux/hv/paschen.htm

Vbreakdown = 24.22 * x + 6.08 * SQRT(x)

 x = 293 * p * d / (760 * T)

p = pressure in Torr (mm Hg), d = distance in cm, T = Temperature in Kelvins, Vbreakdown in kV

Aluminum profiles

http://www.betz.cz/download_soubory/Hlinikove_profily_Bosch_12.pdf
http://www.betz.cz/download/soubory_ke_stazeni.html

3D Model

I just render this image.

Risk Management

analysis was done and sent for comments.

Electrical Design CHapter

was written and distributed for comments.

Update of HV source