192 Agilent InfinityLab LC Series 1260 Infinity II FLD User Manual
8
Test Functions and Calibration
D/A Converter (DAC) Test
D/A Converter (DAC) Test
The detector provides analog output of chromatographic signals for use with
integrators, chart recorders or data systems. The analog signal is converted
from the digital format by the digital-analog-converter (DAC).
The DAC test is used to verify correct operation of the digital-analog-converter
by applying a digital test signal to the DAC.
The DAC outputs an analog signal of approximately 50 mV (if the zero offset of
the analog output is set to the default value of 5 %) which can be plotted on an
integrator. A continuous square wave with an amplitude of 10 V and a
frequency of approximately 1 cycle/24 seconds is applied to the signal.
The amplitude of the square wave and the peak-to-peak noise are used to
evaluate the DAC test.
Running the test with Agilent Lab Advisor
1 Run the D/A Converter (DAC) Test (for further information see Online-Help of
user interface).
Figure 71 D/A Converter (DAC) Test
When If the analog detector signal is noisy or missing.
Preparations Lamp must be on for at least 10 minutes. Connect integrator, chart recorder or data system to the
detector analog output.
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