Author Topic: HP 34401A reads a little low on AC  (Read 1977 times)

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Online bdunham7

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Re: HP 34401A reads a little low on AC
« Reply #25 on: November 03, 2020, 12:13:21 am »
I have a 34401A with a current calibration certificate.  Last calibration date was in 2000.  Calibration count 279.  Here is the voltage calibration data:

So it had annual calibrations for a number of years until 2000--with a significant number of adjustments--and then it has been checked without adjustment since?
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit DMM is good enough for most people.
 

Offline J-R

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Re: HP 34401A reads a little low on AC
« Reply #26 on: November 29, 2020, 06:22:48 am »
I have a 34401A with a current calibration certificate.  Last calibration date was in 2000.  Calibration count 279.  Here is the voltage calibration data:

So it had annual calibrations for a number of years until 2000--with a significant number of adjustments--and then it has been checked without adjustment since?

It appears that way, or the date wasn't updated.  I purchased it with a fresh calibration certificate and they stated it did not need any adjustments. 
 


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