SERVOTOUGH LaserExact Monitor, Operator Manual 02950001A_1
SERVICE
PROGRAM
25
Dark Direct:
Optical zero of the direct signal measured when the laser is switched
off for a short period. The unit is the same as for
Max. Direct.
Laser temp. (V):
The voltage across the thermistor located in the vicinity of the
diode laser. Higher voltages indicate lower laser temperature. Changing laser
temperature changes the laser wavelength.
Laser temp. error:
The amplified difference in Volts between the measured
Laser
Temp
and the reference value. Should be around 0.000. It indicates the quality of
the laser temperature regulation and thus the quality of the wavelength
stabilization.
Peltier pump (A):
The current drawn by the Peltier element.
Modulation ampl. (V):
Amplitude of the high frequency modulation voltage to the
laser.
TU/RU temp.:
The temperatures measured by the embedded thermistors located
inside the transmitter and receiver unit.
Extra current input (mA):
Current measured on extra current input (Flow 4-20 mA
input).
Air pressure (Bar):
The ambient pressure measured by the embedded pressure
sensor located inside the cabinet.
4.3
The program menus
4.3.1
Plot readings
Plot readings
plots the measured average and instant concentration of gases,
transmission and spectral temperature (if measured). Two different plots can be
shown simultaneously. Clicking on the axis labels modifies the scale of the plot.
4.3.2
Second harmonic signal
Second harmonic signal
displays signals recorded by the instrument for
calculation of the gas concentration. This signal is also useful for inspection and
analysis of the absorption spectra, verification of proper laser function, and fault
diagnostics. In total three curves are displayed: the normalised second harmonic
signal as detected (pink curve) and the same signal after filtering with two different
filters (yellow and blue curves). For some instruments only one filter is applied to
the signal.
The example given below displays the signal from an oxygen absorption line. The
peak of the yellow curve is marked with a red cross. The instantaneous gas
concentration as measured from this line; the sample number and position of the
peak are printed in the upper right corner in parenthesis. The latter are referred to
Summary of Contents for SERVOTOUGH LaserExact 2950
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