Agilent Technologies G1314B, User Manual

Page: 29 / 208

Agilent 1260 Infinity VWD User Manual 29
Site Requirements and Specifications
2
Performance Specifications
Specification Conditions
ASTM: “Standard Practice for Variable Wavelength Photometric Detectors
Used in Liquid Chromatography”.
Reference conditions: Standard flow cell, path length 10 nm, flow
1 mL/min LC- grade methanol.
Noise:
<± 0.5·10
- 5
AU at 254 nm, TC 2 s, ASTM
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 (> two hours). ASTM measurements require that the detector should
be turned on at least 24 hours before start of testing.
Time Constant versus Response Time
According to ASTM E1657- 98 „Standard Practice of Testing
Variable- Wavelength Photometric Detectors Used in Liquid
Chromatography” the time constant is converted to response time by
multiplying by the factor 2.2.
N O T E
The specifications are based on the standard lamp (G1314-60100) and may be not achieved
when other lamp types or aged lamps are used.