Operating the Analyzer
301-92-4 A .ver 97020-00094
–5
• Powr: Shows the laser power detected at the absorption peak in A/D
counts. Acceptable values are between 1000 and 2000. A number
below 1000 may indicate that either the optics need to be cleaned or
there is an alignment problem. A value below 200 will cause a Power
Fail.
• Indx: Shows the position of the absorption peak within the
wavelength scan. It should normally be at 290 with the peak tracking
turned on. Typically, values outside of the range of 241 to 339
indicate a Spectrum Fail condition.
• Zero: Shows the detector signal value when the laser is turned off.
It should be in the range of -50 to +50. Outside of this range, a Null
Fail displays.
• PkDf: The factory laser current set point in mA that matches the
target absorption line.
• PkD1: The laser current set point after adjustment by the peak-
tracking software. It should be within a few mA of the PkDf value. If
the analyzer is experiencing problems, one of the first
troubleshooting steps should be to check the peak tracking.
Tracking Fail may be displayed if PkD1 differs by more than 4 mA
from
PkDf. For more information on troubleshooting these issues,
see “Peak Tracking Reset Procedure” on page A-5.
Mode 5: (Not Used)
Mode 6: (Diagnostic Data Download)
Used to transfer diagnostic data to the serial port and read the individual data
points of both the DC and 2f spectra that the instrument analyzes to calculate
the gas concentration. Viewing these data can be helpful in diagnosing
problems with the analyzer. Press # key followed by the 6 key.
The data points, along with int
ermediate calculation results, are output to the
serial port(s) whenever Mode 6 is selected.
+
#
6
UK Distibution by IMA Ltd Tel: +44 (0)1943 878877 Email: info@ima.co.uk Web: www.ima.co.uk
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