WP
4
PotentiaMeter
Troubleshooting
61
moisture to condense on the mirror and provide
a reading.
• The mirror may be dirty. Try cleaning the mir-
ror and chamber and measuring the sample
again.
5. PROBLEM:
A small triangle appears in the upper right corner
after sampling:
SOLUTION:
The mirror needs to be cleaned, along with the rest
of the sample chamber, until it disappears. This tri-
angle is a mirror performance indicator. When the
WP4 senses that the mirror performance has
dropped to unacceptable levels, it will display the
triangular warning sign after the sample has been
measured. When this appears, you should stop sam-
pling and clean the chamber. If the triangle is still
on the screen after cleaning, the mirror is most
likely still dirty and you will need to clean it until
the triangle disappears.
6. PROBLEM:
The following screen comes up after turning on the
C
-1.84 MPa
24.7
pF 7.38
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