High readings on my KIT1 dosimeter.

This topic has 6 replies, 2 voices, and was last updated 9 years, 6 months ago by uRADMonitor.

Viewing 7 posts - 1 through 7 (of 7 total)

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February 7, 2017 at 10:13 am #4018
LZ1JER
Participant
Hello, i’m building a simple weather station on Raspberry Pi 3 here, but strange high reading are present every day. I try with different values of compensation capacitor and different GM tubes, same result.

“”””
uRADMonitor 51000001
type:5 hw:101 sw:114 SBM20
radiation:19CPM
average:24CPM
voltage:380V (35%)
“”””

PWM and High Voltage are stable (380+-1V, PWM 35% – constant), supply voltage is also stable and clear. Cathode and anode network traces are short as posible.

No Idea why is that happening, any help is appreciated.
Thanks in advance!
LZ1JER
Attachments:
1. PCB_V3_2017_small.jpg
2. two_days_chart.jpg
1. uRadmonitor_LZ_eth_only.pdf
February 9, 2017 at 7:55 pm #4026

uRADMonitor
Keymaster

Amazing construction. Basically you’ve re-designed the model A. Would you post about this on the blog (www.uradmonitor.com/blog) or should I do it?

Readings seem fine.

February 11, 2017 at 7:56 am #4048
LZ1JER
Participant
Some additional files for Your Blog

BOM

T6, T3 = MMBT2907A PNP 60/60V 600mA 0.225W 45/100nS
T2 = SST2222A NPN 75/40V 600mA 0.2W hfe 75 300MHz 25/60ns
T1 = MMBTA42 SMD NPN 300V 500mA 0.225/0.3W
vOLTAGE REGULATOR = BA033CC0FP 3.3V±2% 1A, LDO 0.5V, Vinmax=25V
C6, C10, C11 = SIZE 1210 10nF 1000V X7R 10nF 1000V X7R +-10%
D2, D3, D4 = US1M 1000V 1A UFM1.7V/1A IFM30A IR10uA 75ns, Ultra Fast
All others C, R are size 1206 SMD
Attachments:
February 11, 2017 at 7:59 am #4052
LZ1JER
Participant
… and images
Attachments:
February 11, 2017 at 8:30 am #4057

uRADMonitor
Keymaster

Thank you, I will put them together in a nice article. The last two pics are too small, do you have higher res?

February 11, 2017 at 1:22 pm #4059
LZ1JER
Participant
Last two images…
Attachments:
1. uRADmonitor_LZ_PCB_2.jpg
2. uRADmonitor_LZ_PCB_1.jpg
February 11, 2017 at 10:47 pm #4075

uRADMonitor
Keymaster

Thanks for the pictures, and congrats – You’re now featured on the blog’s first page: https://www.uradmonitor.com/kit1-screenless-variant/
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