Extending the Calibration Frequency of a Measurement Device

G

gagegirl

#11
To increase a frequency from once a year = a 12 month cycle. If you increase the frequency (it occurs more often) to twice a year = a 6 month cycle.
 
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C

Corsair

#12
Thank you all gentlemen, for the clarification on this matter.
 
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A

AirdrieQPA

#13
Calibration Intervals – it is generally accepted that the interval of Calibration of measuring equipment be based upon stability, purpose and degree of use.

Stability means that your measuring equipment has the inherent ability to maintain its metrological characteristics overtime and use.

The purpose of your equipment is of prime importance, in general the more critical the application or measurement being made, the more frequent your calibration cycle needs to be.

Usage is pretty self explanatory, but it simply means how often you use the device to take measurements coupled with the environment it is taken in.

You shorten the interval/frequency if your previous records show that the usage indicated the need to tighten up on the interval. By this I mean, suppose your item, item A has a 1 year cycle it is calibrated and found 'out of tolerance' (OOT). You calibrate again at the 1 year interval and it again is OOT. So you shorten you calibration cycle to say six months and on return from calibration your 'as found' and 'as left' reports show in-tolerance. Your next calibration cycle reports the same thing; you know you have probably found a happy place for your equipment.

At my work place the calibration cycle can be extended or shortened based on well reasoned and documented evidence, but only after we have five (5) consecutive, 'as found/as left' in-tolerance reports from the Calibration facility on record. Then we only ever bump the cycle by three months, taking into consideration the three criteria stated at the beginning of my reply.

Cost is also a reason for looking at these cycles but it can not be the sole determining factor, after all this is the cost of doing and staying in the business we are all in.

In short the choice of calibration interval is basically a well reasoned and documented trade off between risk and cost. Too great of an interval increases the risk of mistakes and too short of a period increases the risk of needless spending. The greatest/best advice you can obtain is from the OEM manual supplied with your test equipment in the first place, and then from this you apply the other determining factors.
 
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John Broomfield

Staff member
Super Moderator
#15
The words that we usually use in this business (frequency & interval) have not the same meaning then.

Frequency, meaning rate of occurrence and interval meaning cycle (the amount of time between a specified events).

Correct?
Correct, 60Hz is a frequency of cycles per second

A second is an interval.

Lengthen the interval and you reduce the frequency.

Shorten the interval and you increase the frequency.

You can see they are different.
 
S

sathishthantri

#16
Gentleman,

Increasing the frequency would be going from 6 months to 3months, an increase in how many times it is done. Whereas decreasing the frequency is going from 6months to 12months, a decrease in the number of times in a period.

I need your toughs on the above statement.Any body agree to that?

:thanx:




May be I was not clear enough, on this one.

But to me, when we increase the frequency of an instrument is to "prolong"
the interval of calibration and to decrese is to shortened the interval of cal-.

Is this correct?

Dear Corsair,
There is lot of confusion due to these messages contradicting each other:mad:

You were right in the initial mail but in the subsequent mail you changed the entire meaning
Frequency means no. of cases i.e increased frequency leads to more number of calibration (hence lesser time duration - 6 to 3 months perhaps)and decreased frequency means less number of calibration (hence prolonged time duration, 6 - 12 months perhaps).
Sathish
 
K

KwalityWonk

#17
FORGET FREQUENCY!!! The term is Interval, and you may increase or decrease as statistically justified. I'm lazy, and don't remember enough math to calculate it myself, so I use a little freeware calculator based on RP-1 method A3. Very simple. Recommends increase or decrease. Just plug in a few parameters. FREE. Integrated Sciences Group (ISG) A# Interval Tester.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#18
In short the choice of calibration interval is basically a well reasoned and documented trade off between risk and cost. Too great of an interval increases the risk of mistakes and too short of a period increases the risk of needless spending.
A better description of the risk includes the impact of the "mistake" - such as the cost of recalling product back to your previous calibration date because the gage was reading erroneously and clearly you have no idea when the error began. Compare that and value of your customer's reaction to the cost of performing the calibration and you should be in good shape. If yours is a situation where you intend to ignore any issues after they have left your dock, the interval may be a little longer based on less perceived risk.
 
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