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2182A readings have many shots and large fluctuations

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hachiko
Posts: 18
Joined: May 15th, 2013, 6:02 am
Country: China

2182A readings have many shots and large fluctuations

Post by hachiko » August 24th, 2014, 1:27 am

I have 2182A input cable's 2 blades (black and red) shorted. With default settings (channel 1, slow rate, filter on), the readings I got were following, showing many shots and large fluctuations.
I don't know where these shots came from since the input is shorted with Keithley's cable. How can I eliminate these shots and reduce fluctuations?

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Andrea C
Keithley Applications
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Joined: October 15th, 2010, 10:35 am
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Re: 2182A readings have many shots and large fluctuations

Post by Andrea C » August 26th, 2014, 7:14 am

Do you still have the DeoxIT solution that ships with the 2182A?
Try cleaning the contacts per the procedure on page 1-13 of the 2182A User's Manual.

Are you using a clean copper clamp to create the short between the red and black spade lugs on the 2107 input cable?

hachiko
Posts: 18
Joined: May 15th, 2013, 6:02 am
Country: China

Re: 2182A readings have many shots and large fluctuations

Post by hachiko » August 27th, 2014, 9:05 am

What is the " DeoxIT solution"? I don't understand. I will try the cleaning with a sand paper.

Yes I am using a clean clamp for shorting the red and black spade lugs.

Andrea C
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Re: 2182A readings have many shots and large fluctuations

Post by Andrea C » August 27th, 2014, 4:29 pm

The DeoxIT is a contact cleaning solution that is provided with the instrument when new. It is usually packaged with the copper alligator clips. The 4-pin copper contacts in the LEMO connector on the 2182A can also oxidize. This cleaning fluid can be used to remove the oxide.
2182A_contact_cleaner.PNG
2182A_contact_cleaner.PNG (28.4 KiB) Viewed 17054 times

hachiko
Posts: 18
Joined: May 15th, 2013, 6:02 am
Country: China

Re: 2182A readings have many shots and large fluctuations

Post by hachiko » October 9th, 2014, 5:39 am

I cleaned the clips, but still got the shots time by time.

Dale C
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Re: 2182A readings have many shots and large fluctuations

Post by Dale C » October 9th, 2014, 12:51 pm

I ran the 2182A with a short on the input cable for 10,000 readings with your settings.
The result is as follows...
This is what you should be seeing.
No spikes.
Attachments
2812A test.png
2812A test.png (218.35 KiB) Viewed 16986 times

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