cmug hat geschrieben:I try to read the specification sheet (I found on pripyat website).
But I can’t read Russian language.
Well, you can simply enter сбт10а into google and it will happily
find some russian website with some data which can be pasted
into google translator. The result will look like:
Specifications appliances Geiger-Mueller SBT-10A:
The source of radiation - Cs;
Sensitivity to gamma radiation:
EDR - 4,0mkR ∙ s-1;
362,5mkR 40mkR 1 ± 1;
1450,0s ± 1 160s-1;
Rated operating voltage of the device Geiger-Muller counter SBT-10A - 400V;
Voltage beginning bills - 260V-320V;
Slowness counting response - not less than 80V;
The slope of the counting response - no more than 0.3% / V;
Maximum working EDR - 6500c-1, 30mkR ∙ s-1 to n.. ± 20%;
The maximum permissible dose rate - 300R ∙ h-1;
Dimensions - 70h91h38mm;
Weight of the device Geiger-Muller counter SBT-10A - 150g.
I looked for an circuit online, how connect this tube but did found only 1 website.
How should I connect this tube to my counter ?
I bought as counter the High Voltage Geiger Probe Driver from rhelectronics.
Don't know this thing but judging from its website it starts at 420 V while
the SBT10A apparently likes to see 400 V. I have no experience with the
SBT10A but it should be OK with 420 V. It probably won't blow off but it
might hurt its life expectancy slighlty. Best would be to dim the source
down to some 390 V...
The Kathode (Minus) is High Voltage Geiger Probe Driver connect to the earth, that seems not the problem.
But the Anode (+) ? Should I just parallel connect them ? (I saw that on a photo on Ebay)
Should I give every single Anode an 10 MΩ resistor and then connect them ?
Like this: http://shaddack.brutowave.com/projects/ ... akeGeiger/
Well, this depends on the detection circuit of the rhelectronics board. If it
grabs the pulses from the tube's cathode (as shown on your pancake
geiger link), you will be happy by connecting it the same way.
NEVER COMBINE THE ANODES TOGETHER DIRECTLY AND WITHOUT
This will impose a noteworthy capacitive load which will be discharged
entirely for each pulse and puts a somewhat high burden onto the tube.
Same applies for the wires between the resistor(s) and the anode(s):
Always keep them as short as possible.
But if I look at http://www.rhelectronics.net/store/medi ... -probe.JPG
it seems that the tube's cathode is connected to the system's ground
and they are detecting the pulses on the anode's end. We have just
learned that you should not combine all the anodes without their
individual resistors (see above). But if you connect the anodes as
they should be and attach the "virtual" common anode to the
rhelectronics thingie, you will probably lose too much of the pulse
to be detected properly. You just have to try...
One first step might be to connect just one anode (without a
resistor) and keep the others floating. If it counts it is good and
you're on the right path but beware that you will lose approx.
90% of all events (as only one anode is connected).
Next would be to check how the anode detection is implemented
in the rhelectronics board. If it's the standard version (resistive
voltage divider with a capacitor attached to the tap) we might try
to remove the anode's end resistor and replace it by the virtual
common anode from above. But this is all wild guessing -- it
would help a lot if we had some schematics (at least for the
detection circuit) of the rhelectronics board...