Need to send out for Calibration or Self-calibration? HP model# 35670A analyzer

al40

Quite Involved in Discussions
#1
I have a HP model# 35670A with "self-calibration" does this unit still have to be calibrated since it is self calibrating?

I'm not sure how to handle this since my engineering group contends to argue against the fact to have the unit sent out for calibrated since the cost is very expensive for calibration and that's why they bought it with self calibrating capabilites to begin with.


Thanks,

Al
 
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Al Rosen

Staff member
Super Moderator
#2
Allen M. said:
I have a HP model# 35670A with "self-calibration" does this unit still have to be calibrated since it is self calibrating?

I'm not sure how to handle this since my engineering group contends to argue against the fact to have the unit sent out for calibrated since the cost is very expensive for calibration and that's why they bought it with self calibrating capabilites to begin with.


Thanks,

Al
This is a common misconception. It needs to be calibrated periodically. How do you know the internal references haven't changed? What does the mfr state about recommended calibration intervals?
 
Last edited:

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#3
Al is correct.

The self-cal function uses an algorithm which relies on stored information that is input during the calibration by the accredited laboratory, in this case most likely Agilent. That algorithm is not a true cal, but a readjustment to significantly reduce drift and related issues.

It needs to be sent out, unless your accredited cal provider can perform the calibration at your location.

Hope this helps.

Hershal
 
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