I don't know what logo cal is, but between Z540 and 17025 is a
question of procedures and how they are done.
In metrology the procedures, and how strict they are, reduce the risk
of uncertainty in the final measurement. For example, some
procedures in Z540 can be 'interpreted' where in 17025 is explicit,
thus there is more room in Z540 for one lab to be worse than another,
or vice versa, which defeats the purpose of standardization. This
'intepretation' is fairly reduced when the device is cal'd by an
autocalibrator such for close case calibration DMMs, but becomes a
big issue with any manual cal.
If these do not mean anything to you and you do not need the data for
long term drift calculations, ISO 9001 is good to go.
IMHO the difference between all 3 is insignificant for 5.5 digit
DMMs, except for one's need for data.
http://us.flukecal.com/literature/articles-and-education/temperature-calibration/papers-articles/comparison-ansincsl-z540-1?geoip=1
At 12:30 PM 8/7/2013, Joseph Gray wrote:
I just got the following quote for getting my HP 3478A calibrated.
35.00 for ISO 9001 no data
87.50 for Z540 with data and uncertainties
275.00 for 17025 with data, uncertainties and logo calibration.
I still didn't get any explaination as to exactly what the lab does for
each of these price points. When I asked about the "Level 4" listed next to
the meter, I was told that it is the difficulty level. Still not telling me
much. I have read the procedure in the HP service manual and it is very
easy. You set some volt, amp, ohm values on the standard, then push some
buttons on the meter.
I understand about getting data or not, it is the other aspects that I
don't understand. What is Z540, 17025 and "logo calibration"?
Joe Gray
W5JG
Sincerely,
Marv
Philadelphia, PA
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