Agilent InfinityLab LC Series Diode Array Detectors User Manual 148
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 µV 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.
1 Run the D/A Converter (DAC) Test with the Agilent Lab Advisor (for further
information see Online-Help of user interface).
Figure 47 D/A Converter (DAC) Test – Results
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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