Date: Wed Dec 17 17:46:40 2008

Author: Tom Johnson

Subject: Re: Electrometer/Video Camera

Post:

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To all interested parties,

I checked our Keithley for the models suggested. Of course, they
were selling their new and improved

Model 6514 Programmable Electrometer. I expected a quote of over
$5,000 but with a 5% discount for educational institutions (in effect
until Dec. 31, 2008), the quote came back at $

3,213.75. It appears to be a pretty good deal.

Thanks for suggestions and sorry it took a while to get back report
the findings.

On another note, I'm looking for a good video camera capable of
recording, say a demonstration live in front of the class and
playback later. We are looking to use the live demo as a "clicker"
question then the playback can be used for the full explanation after
answers have been recorded. Relatively high resolution is
desired. I can spend in the neighborhood of $1200.

Thanks in advance for this one.


At 11:56 AM 12/10/2008, you wrote:
>Tom,
>
>We bought a few of the Pasco Electrometers a couple of years
>ago. They've been reliable.
>For demonstration you'd probably want to plug it into some ADC box
>and a computer. It outputs a voltage that is proportional to the
>scale reading.
>
>Stray fields and changing humidity will drive you nuts with
>electrostatics demos. e.g. works great when you set it up, but when
>you fill the room with students the results suddenly get
>strange. Or, works fine until you roll up your sleeve and find that
>you've just created a huge static potential on the hairs of your forearm.
>
>Paul
>
>
>
>On Dec 10, 2008, at 1:36 PM, Tom Johnson wrote:
>
>>Tapplers,
>>
>>Does anyone have suggestions regarding the purchase of an
>>electrometer for demonstration purposes?
>>
>>
>>
>>Later,
>>Tom G. Johnson
>>Dept. of Physics and Astronomy
>>Washington State University
>>Pullman, WA 99164-2814
>>phone: (509) 335-5097
>>email: johnstm@wsu.edu
>>Web: http://www.physics.wsu.edu/demos/default.htm



Later,
Tom G. Johnson
Dept. of Physics and Astronomy
Washington State University
Pullman, WA 99164-2814
phone: (509) 335-5097
email: johnstm@wsu.edu
Web: http://www.physics.wsu.edu/demos/default.htm

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To all interested parties,
I checked our Keithley for the models suggested. Of course, they
were selling their new and improved Model 6514
Programmable Electrometer. I expected a quote of over
$5,000 but with a 5% discount for educational institutions (in effect
until Dec. 31, 2008), the quote came back at
$3,213.75. It
appears to be a pretty good deal.
Thanks for suggestions and sorry it took a while to get back
report the findings.
On another note, I'm looking for a good video camera capable of
recording, say a demonstration live in front of the class and playback
later. We are looking to use the live demo as a "clicker"
question then the playback can be used for the full explanation after
answers have been recorded. Relatively high resolution is
desired. I can spend in the neighborhood of $1200.
Thanks in advance for this one.

At 11:56 AM 12/10/2008, you wrote:
Tom,
We bought a few of the Pasco Electrometers a couple of years ago.
They've been reliable.
For demonstration you'd probably want to plug it into some ADC box and a
computer. It outputs a voltage that is proportional to the scale
reading.
Stray fields and changing humidity will drive you nuts with
electrostatics demos. e.g. works great when you set it up, but when
you fill the room with students the results suddenly get strange.
Or, works fine until you roll up your sleeve and find that you've just
created a huge static potential on the hairs of your forearm.
Paul

On Dec 10, 2008, at 1:36 PM, Tom Johnson wrote:
Tapplers,
Does anyone have suggestions regarding the purchase of an electrometer
for demonstration purposes?

Later,

Tom G. Johnson
Dept. of Physics and Astronomy
Washington State University
Pullman, WA 99164-2814
phone: (509) 335-5097
email: johnstm@wsu.edu
Web:

http://www.physics.wsu.edu/demos/default.htm



Later,

Tom G. Johnson
Dept. of Physics and Astronomy
Washington State University
Pullman, WA 99164-2814

phone: (509) 335-5097
email: johnstm@wsu.edu
Web:

http://www.physics.wsu.edu/demos/default.htm



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