need a 100K-Megaohm resistor (100 Giga-Ohm)

[Scott Johnson]

An electrometer measures electric charge, usually in coulombs, but many 
newer units such as the Keithley units, are in reality very high 
impedance multimeters.  I have a few Keithleys of various models for 
sale if anyone is interested.  They are all digital readout, solid state 
units. A FET is used in place of the electrometer tube.

Scott

GDM wrote:
> OK,  educate me.  What's an electrometer and what is it used for?
>
> 73,  Gary  W9OAK
>
>>  
>>
>>> Another issue is getting a good CK5886 electrometer tube. These are 
>>> hard to
>>> come by nowadays and about half of them have a bit of gas in them. 
>>> Enough
>>> to make them useless due to ion currents. You may have to get several
>>> before you find one with low enough grid current.
>>>
>>> 73
>>> Bill wa4lav
>>>   
>>
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