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 2.GQ Geiger Muller Counter
 Tube Voltage measurements

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T O P I C    R E V I E W
ggetchell Posted - 05/13/2014 : 16:23:08
Good Evening I purchased the GMC-080 and was reading several posts regarding using a 11M ohm resistance meter to measure the correct voltage on the circuit for specific tubes, I have not been able to find any 11M ohm meters all I can find anywhere are 10M ohm. also is this the impedance resistance or is this something different, can you recommend a low cost if available meter for this, and would a 10M ohm resistance meter work the same way???

Thanks
4   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 09/07/2014 : 12:19:12
The value of resistor placed on the ANODE side of the tube is depending on the tube. That is not for measuring the voltage, it is a DC current regulator resistor.

For all high voltage measuring, 1000Mohm or 1Gohm serial resistor on the meter is the best.
Alchemy2 Posted - 09/07/2014 : 07:44:31
ZLM,

I assume that the 1000Mohm or 1Gohm serial resistor is best placed on the ANODE side of the tube? Just checking.

Thanks!

Alchemy2

quote:
Originally posted by ZLM

10M ohm resistance meter should be fine.

Do get accurate voltage reading, you need to serial a 1G Ohm resistor to probe and then calculate the actual voltage reading.

See: http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=3745

ggetchell Posted - 05/14/2014 : 02:58:53
Thanks for the response, I thought that I would need to adjust the calculation for a 10 Meg ohm meter, but wanted to be sure.
ZLM Posted - 05/13/2014 : 23:43:29
10M ohm resistance meter should be fine.

Do get accurate voltage reading, you need to serial a 1G Ohm resistor to probe and then calculate the actual voltage reading.

See: http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=3745

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