Background Noise (Stray Light) Test - Agilent Technologies 1260 Infinity User Manual

6 Troubleshooting and Diagnostics
Noise Test Procedures

Background Noise (Stray Light) Test

For this test, the HPLC pump must be off (no solvent flow).
N O T E
To determine the background noise :
1 Make sure the siphon is filled and the bulkhead is blocked with a blank nut
2 Switch on the gas flow at 3.5 bar (51 psi).
3 Set the temperature to 50 °C. Wait for stable temperature.
4 Switch on the light source.
5 Set the Gain to 1.
6 Set the offset to 0 mV.
7 Wait 15 minutes for stabilization and record the signal level.
8 Increase the gain to 12 and monitor the signal.
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or Parafilm™ to avoid a Venturi effect.
The expected level is typically 100 mV to 150 mV.
Agilent 1260 Infinity ELSD User Manual