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6487 Noisy Voltage Source

2502, 6485, 6487 - Support
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Joined: October 8th, 2014, 11:01 pm
Country: Japan

6487 Noisy Voltage Source

Post by dmo_qb » October 8th, 2014, 11:05 pm

Hi there,

I'm trying to use the 6487 as a voltage source for a quick experiment, but noticed that its output is fairly noisy. I only need +100mV, but I seem to be getting a 40mV p-p pulse of noise at 25MHz when I plug the Voltage Source directly to the oscilloscope. It sits around 2mV RMS however.

I know I must be doing something not quite right, but has anyone seen this before?


Joseph V
Keithley Applications
Keithley Applications
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Joined: July 1st, 2014, 10:31 am
Country: United States

Re: 6487 Noisy Voltage Source

Post by Joseph V » October 9th, 2014, 6:47 am

The 6487 does not have a noise specification at 25MHz, however we do provide a wideband noise specification from 0.1Hz o 20MHz which has a level of 30mV p-p, so by going even high I am not surprised that you are seeing 25MHz p-p.

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