Siemens DCA Vantage, Руководство оператора, Страница: 106 / 214

106 DCA Vantage Operator’s Guide
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• If Quality Control samples do not give the expected values
• During the installation procedure
• If you relocate the instrument
• As part of the as-needed and quarterly maintenance schedules
NOTE:
The optical test cartridge is reusable; do not discard.
Optical Test Values
The optical test offers two options:
• Precision only—Runs during the first minute of testing and records the
values for Mean Transmittance (Mean T) and Standard Deviation (SD T)
• Precision and drift—If selected, this test runs for an additional 5 minutes
and measures the drift of the optics over 20 transmittance readings taken
during that period. The measured values are Drift T, the average drift in
transmittance, and Drift Max, the difference between the minimum and
maximum transmittance of the 20 transmittance readings.
When the optical test completes, the DCA Vantage system displays the
Mean T, SD T, Drift Max, and Drift T readings. Table 5 provides the value
ranges for the Optical Tests.
Table 5 Optical Test Value Ranges
Values Range
Mean Transmittance (Mean T) 0.95–1.05
Standard Deviation (SD T) < 0.0015
Drift Max < 0.0280
Drift T No applicable limits