Agilent InfinityLab LC Series VWD User Manual 34
2 Site Requirements and Specifications
Performance Specifications
Specification Conditions
ASTM: “Standard Practice for Variable Wavelength Photometric Detectors Used
in Liquid Chromatography”.
Reference conditions: Standard flow cell, path length 10 mm, flow 1 mL/min
LC-grade methanol.
Noise:
± 1.5·10
-6
AU at 230nm, TC 2s
RT = 2.2 * TC
Linearity:
Linearity is measured with caffeine at 265 nm.
ASTM drift tests require a temperature change below 2°C/hour (3.6°F/hour) over
one hour period. Our published drift specification is based on these conditions.
Larger ambient temperature changes will result in larger drift.
Better drift performance depends on better control of the temperature
fluctuations. To realize the highest performance, minimize the frequency and the
amplitude of the temperature changes to below 1°C/hour (1.8°F/hour).
Turbulences around one minute or less can be ignored.
Performance tests should be done with a completely warmed up optical unit
(> one hour). ASTM measurements require that the detector should be turned on
at least 24 hours before start of testing.
The specification are based on the the standard RFID tag lamp (G1314-60101)
and may be not achieved when other lamp types or aged lamps are used.
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