Ludlum Model 3-6

This is my new ludlum model 3-6 survey meter, it cost $255. Please subscribe

Category:

Science & Technology

Tags:

• ludlum
• model
• 3-6
• geiger
• counter
• new
• radioactive
• science
• detector

[amatomicX]

Nice video and nice counters. That looks like a probe from a military geiger counter. It probably has 700 volt geiger tube in it. I have one of the tubes that went in those, ( it's a 700v. ) I going to try and build a simple volt meter just for testing geiger counters, with a panel meter and a string of 10 meg.Ohm resistors. I'll let ya all know if it works good . keep them Ludlums clickin'

[jrbpyro101]

I look forward to seeing that! thanks for the comments, i have 2 other ludlums but i have had a lot of problems with uploading videos lately so i hope to have those videos of soon.

[amatomicX]

Testing voltage on a Ludlum (continued ) Your average small digital or analog voltmeter that so many of us have won't work for a geiger counter volt tester. They don't have a high enough sensitivity (impedance) , and will drain down on the counter's H.V. supply and it will read way too low. So you need a meter with a high impedence like an old Triplett 630 or a Simson that has a scale that goes up to 5000 or 6000 volt D. C. they won't "load down" the geiger , and will read true voltage.

[jrbpyro101]

well i have a voltmeter from radio-shack that works well for finding the voltage. All of the ludlum scaler and ratemeters have a lcd on them that allow you to read the voltage and set it to what you want

[amatomicX]

Hi I was lucky enough to have a good friend who sold me a Ludlum model 2 and a model 16. One problem with these counters is how to know what voltage the counter is set to ( if you want to change to a scintillation probe or a geiger tube that needs a different voltage. all the Ludlums have a H.V. adjust screw. ( continued on next post )

[jrbpyro101]

Well the easiest way to find the voltage is to just get a multimeter and put the contacts on the HV connector on the ludlum and you can adjust the voltage from there

[connectingdots1]

Be gentle with those connectors as they have a tendency to short out right where the connection is. BTW have you done many background CPM checks in your neighbourhood>..if so please reply and tell me what your readings were.

thanks!

peace and prosperity

CD

[Huffdev]

where u get that?

[theDaxcorp]

@a12345nful on the 2241-3 you gotta put in the correct cal constant and deadtime and the correct voltage that it operates at for it to work right..discrimination may need to be set too..standard operating voltage on a 133-7 is 460 volts

[theDaxcorp]

@jrbpyro101 yeah but you need to go thru a hv divider box so you will not damage your multimeter and get an accurate reading ..they run about 150 bux

[a12345nful]

Hello.. thank you for nice video. I have got ludlum 2241-3.

Have got 3 probe, pancake (44-9), NaI scintillation (44-2) and 133-7 (high range gamma GM).

But i have a problems with 133-7 probe. I am not sure if it ismeasuring correctly or not. Because it measures sometimes like 1 mR/hr and than it doesn't measure for any undetermined time. Do you have any idea usage/use area of 133-7 probe?

[amatomicX]

jrbpyro I sent a message to your inbox. please let me know if you got it, then return a message to my inbox. I'm just setting up my You Tube page.

[amatomicX]

Thanks and moe vids would be cool. I'm not setup to post vids right now, but In the future I'll try and post some neat stuff.