wtw PhotoLab S6 Operating Instructions Manual page 61

8. Analytical Quality Assurance (AQA)
After successful light barrier testing, the PhotoCheck
standards (test solutions) are measured.
Example:
Absorbance test OK...
After approx.
3 s:
l
Insert the next test solution
l
Cancel:
To cancel the check means no
release for the next "meter" AQA
interval!
The absorbance test is terminated if an error message occurs and the meter is not released.
On switching on, the warning message "AQA interval expired" appears until the AQA was
successfully performed or the AQA mode was switched off.
Example: Report output
AQA check meter
26.08.97
operator:
AQA interval
AQA check AQA1
L check
test sol.
445-1
– Insert a cell with the test solution, 445-1.
The photometer measures the absorbance of the
test solution and compares the result with the value
entered.
...or error message
Error elimination:
1. Repeat the measurement (insert
the cell again)
2. If necessary, perform a zero adjust-
ment and repeat the check
3. Exchange the test solution (each
packet contains two identical test
solutions)
4. Use a new Spectroquant
Check packet
5. Quit and have the photometer
checked in the factory
meas. unit
value
0.211 A
®
Photo-
AQA1
10:23
12 weeks
ok
ok
theor. val. tolerance
0.200 0.020
result
ok
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