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australian electronic gold prospecting forum.com  |  Recent Posts
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 51 
 on: Tuesday April 10 2018 20:55:38 AEST PM 
Started by mylab - Last post by techo_bob
Thanks fellas
Much appreciated

Bob..

 52 
 on: Tuesday April 10 2018 17:37:17 AEST PM 
Started by mylab - Last post by Doug
  
Ok Guy's

Which forum is the DP Forum?

bob..


  
doug smile

 53 
 on: Tuesday April 10 2018 16:30:00 AEST PM 
Started by mylab - Last post by mylab
Google detector forums then look for the one which has the initials DP.

 54 
 on: Tuesday April 10 2018 14:28:12 AEST PM 
Started by mylab - Last post by techo_bob
Ok Guy's

Which forum is the DP Forum?

bob..

 55 
 on: Tuesday April 10 2018 10:49:00 AEST AM 
Started by mylab - Last post by mylab
On the DP Forum a test result between a GPZ and a GPX that would give confidence to the GPX operator.


 56 
 on: Sunday April 8 2018 21:44:27 AEST PM 
Started by Doug - Last post by Doug
  
Vale Lefty Kreh
A fly fishing legend has left us. SAD
Looking back at the man behind the legend
    
link-   
doug SAD
 
Lefty Kreh in my view was one of smoothest,the most relaxed and beautiful fly casters.
Here is  video  of him teaching some of his basics.
  
doug smile

 57 
 on: Sunday April 8 2018 12:37:43 AEST PM 
Started by Doug - Last post by Doug
Vale Lefty Kreh
A fly fishing legend has left us. SAD
Looking back at the man behind the legend
    
link-   
doug SAD

 58 
 on: Saturday April 7 2018 13:08:40 AEST PM 
Started by Aziz - Last post by gef12
yep no probs Aziz .. sounds feasable .. I did a course " Meausurements Uncertanity" with NMI Aust years ago for our work and there was a lot of math involved.. as we calibrated "Instruments" and was required at the time .. now we out source thank god ... so dont have to go to court if there are issues now....

 59 
 on: Friday April 6 2018 19:51:03 AEST PM 
Started by Aziz - Last post by Aziz
  
Hi Aziz .. must be using something as a reference for your accuracy ...  Local measurements Lab ?

Hi gef12,

I use high accuracy reference metal film resistors. I only have to know their exact resistor values.
I have bought a bunch of different 0.1% metal film resistors last month.
With the initial 0.1% reference resistors, I can measure lets say ten 1% resistors. When I connect the then resistors parallel, I can calculate their parallel resistor. So the value of the 0.1% resistor can be determined easily back and I can increase it's tolerance from 0.1% into 0.1%/sqrt(10) = 0.032%. Trivial task.
I have 5 reference resistor to be calibrated. Each measurement range has it's own reference resistor. Going from 10 Ohm, 100 Ohm, 1 kOhm, 10 kOhm to 100 kOhm.

Cheers,
Aziz

 60 
 on: Friday April 6 2018 13:19:26 AEST PM 
Started by Aziz - Last post by gef12
Hi Aziz .. must be using something as a reference for your accuracy ...  Local measurements Lab ?

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