[volt-nuts] Fluke 335A

gbusg gbusg at comcast.net
Tue Sep 27 01:55:53 UTC 2011


Hi Joe,

On a given range, the 335D's noise is a fixed quantity regardless of your 
output voltage setting. Therefore as a percentage of output voltage, the 
noise is the least at full scale of range, and greatest at voltage settings 
that are a small percentage of full-scale.

Unfortunately the lowest output range for the 335D is 10VDC. Therefore for 
most quiet output, you'd have to set for something near 10VDC (full-scale).

As a percentage of output voltage setting, noise and zero-offsets will be 
higher at tenth scale. In your case you're setting for approximately 
hundredth scale. So noise and zero offset will be significant as a 
percentage of your output voltage setting.

One way around this problem would be to build an external divide by 10 and 
divide by 100 resistive divider. That way you could set the 335D to near 
full-scale, yet achieve the lower voltages you desire.

Best,
Greg


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: <volt-nuts at febo.com>
Sent: Monday, September 26, 2011 7:28 PM
Subject: [volt-nuts] Fluke 335A


My 335A is, seemingly, behaving but I have noticed two issues.



First, there is a slow fluctuation in the 'zero' reading and requires
adjustment every day or so to make it read 0.00000+/-.



Second, once adjusted, when set to 0.123456 volts, it fluctuates 2 or 3 uV
when monitored on an HP 3478A.



Are these behaviors normal?  If not, what suggestions are there to resolve
this?



Thanks in advance.



Joe

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