Operating the System Page 2-13
Analyzing QC Samples
QC Handling
Significant errors in QC measurements may be caused by:
• improper storage and temperature equilibration of the QC sample,
• improper mixing of the QC sample,
• contamination of the QC sample by room air.
Always follow the manufacturer’s instructions for use carefully,
especially regarding the temperature of the QC before sampling. Mix
the ampule thoroughly, and once opened sample the QC immediately.
Do not re-use an opened ampule. Position the probe near the bottom of
the ampule to obtain a representative sample.
Recalling the Last QC Data
The 248 retains the data for the last QC sample measured at each
level.
1. From Ready press # for menu, 4 for Data Recall and 2 for QC Data.
2. Press 1 - 4 to select the QC level.
3. The QC data is recalled to the display.
4. Press # to print the data.
The printout shows the date and time the QC sample was analyzed,
not the time of recall.
→ Data Recall → QC Data
1 Level 1
2 Level 2
3 Level 3
4 Level X
press 1 - 4 or * to Exit
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