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The Power LED is used both to indicate power status and to indicate that power-up
tests have passed. It therefore cannot be relied on as a true power status indicator.
Always unplug the DC Power In connection if you suspect your Reference 3000 is
malfunctioning.
The USB LED
The USB LED is located just above the Power LED. It is a tri-color LED, capable of glowing green, orange, or
red.
The USB LED will be unlighted when:
The Reference 3000 is not powered.
•
The Reference 3000 does not have a USB cable plugged into its rear panel USB port.
•
The computer end of the USB cable is not plugged into a USB port on a computer or hub.
•
The USB cable is not supplying USB power to the Reference 3000.
•
The computer has disabled the USB port going to the Reference 3000.
•
The USB LED will glow a steady green if a valid USB connection has been made and the Reference 3000's
communication processor is receiving power down the USB cable.
The USB LED will flash orange whenever the Reference 3000 is receiving or transmitting valid USB messages to
or from the host computer. It will not flash if there is USB traffic addressed to other devices on the USB bus,
including messages aimed at a different Reference 3000.
The USB LED will indicate a solid RED in one special condition. It will be red when a firmware download is
taking place. Interrupting a firmware download can cause a catastrophic failure of your system. Do not turn off
the Reference 3000, do not unplug the USB cable, and do not stop the host computer operation when the USB
LED is a steady red color.
Do not interrupt a firmware download while it is in progress. An incomplete
download can render a Reference 3000 inoperable until it is returned to Gamry for
reprogramming.
Cell LED
The Cell LED glows yellow whenever the Reference 3000 is actively applying voltage or current to the
electrochemical cell attached to the Cell Cable. You should avoid touching the cell cable leads whenever the
Cell LED is lighted, because the quality of the data being collected in your experiment may be compromised.
The Cell LED does not indicate a dangerous condition when it is lighted. The voltages
output by the Reference 3000 are generally considered to be safe. Still, you should
avoid touching the cell leads when the cell is on.
If you need to make changes to your cell leads, you normally do so between experiments, when the Cell LED is
off and the potentiostat is inactive.
In a typical experimental sequence, the Cell LED will be off between experiments and during any open circuit
potential measurements. It will glow yellow whenever the cell is polarized.
Chapter 6 -- Panel Indicators and Connectors--Front Panel
CAUTION
CAUTION
CAUTION
6 - 2
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