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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
5-10
5.2 Sample Mode
5.2.1 Test Functions
NOTE
In any of the following TEST functions, if a value of
XXXX is displayed, that indicates an off scale and
therefore meaningless reading.
To use the TEST functions to diagnose instrument faults, refer to Troubleshooting Section 9.1.
Range
This is the range of the instrument. Electronically, there is only one physical range. The range of
the instrument is just the software expanding various portions of the single physical range to fill
the selected analog output voltage range. In standard configuration there is one range for all 3
outputs.
Independent range option allows different ranges for each output. When enabled, there will be
three range values displayed, NO, NO
x
and NO
2
.
Auto range mode allows a low range and high range. The M200AU will automatically switch to
the other range dynamically as concentration values require. The TEST values will show the
range the instrument is currently operating in, and will dynamically display the alternate range as
the range changes occur.
NOTE
Each of the range modes Single range, Auto range, and
Independent ranges are mutually exclusive.
Stability
The instrument noise is computed using the standard deviation of the last 10 minutes of data,
with the value being computed at the end of each NO/NO
x
cycle. It is computed for the NO
x
channel only. The stability value only becomes meaningful if sampling a constant concentration
for more than 10 minutes. The value should be compared to the value observed in the factory
check-out.
The Stability reading on the front panel TEST functions is different than the STABIL reading
found in the DAS. Check the DAS in Section 5.3.3 for more information on the STABIL - DAS.