Introduction 
Agilent Cary 3500 UV-Vis Spectrophotometer User’s Guide  23 
Back of the module 
 
Indicator LED 
The LED on the front of the module indicates the status of the system: 
  Off – no power to the instrument 
  Solid yellow – the engine is starting up, a calibration has started, a calibration 
error occurred, or the calibration was not completed. 
  Slow flashing yellow – the lamp is flashing during calibration 
  Fast flashing yellow – the instrument is waiting to perform a scan 
  Red – an instrument error occurred, or the module is powering on 
  Solid green – the instrument is ready 
  Flashing green – the instrument is scanning 
  The engine power LED, located on the left side of the engine, is green if power is 
on, and off if there is no power. 
Using the software 
For information on how to use the software, double-click the Cary UV Workstation 
Help and Learning Center icon installed on your computer desktop during the Cary 
UV Workstation software installation. 
Electrical interface 
Information is sent 
between the module and 
engine
 
Module positioning 
indents 
Module label 
The serial number is located here 
and on the left side (not shown) of 
the module