Page 16
When “READY TO TEST” is displayed on the Main Test Screen:
•
Press
[Memry]
•
Highlight
RH SENSOR CAL
•
Press
[START]
Accuracy of results should be within five (5) percent of the capillary capacity, usually 1000
micrograms (950 to 1050
µ
g). If using a different value capillary tube, use
±
5% of the value
listed on the container for the tolerance.
Allow the test to proceed until completed. It should take five to seven (5 to 7) minutes.
If desired, perform four more calibration tests and calculate the statistics. Calculations must be
performed by hand if the instrument is 21 CFR, Part 11 compliant.
After the 5th test:
•
Press
[Menu]
for the MAIN MENU,
•
Highlight STORED DATA MENU and press
[Selct]
, (Not available in 21 CFR. Part
11 compliant instruments)
•
Highlight ANALYZE STORED DATA and press
[Selct],
•
Highlight and
[Selct]
the desired results to be included in the statistics, and
•
Press
[Stat]
to calculate Average, Standard Deviation, and Coefficient of Variation.
The average should fall within
±
5% of the capillary tube’s calibrated value.
If the mean result does not fall within the
±
5% range, perform the sensor
calibration. See the procedure beginning on page 17.
If this is a 21 CFR, Part 11 compliant instrument, all readings must be recorded by hand; AZI
recommends using a printer to capture the values. The calculations must be performed on a
calculator since the instrument’s storage and analysis functions are disabled.
Mean, Standard Deviation, and Coefficient of Variation are calculated using the following
formulas.
•
Mean = total of results divided by number of results.
•
Standard Deviation =
1
-
n
x
-
x
2
)
(
Σ
•
Coefficient of Variation = Standard Deviation divided by Mean times 100%
