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USB LED
The USB LED is located just below the Power LED. It is a tri-color LED, capable of glowing green, orange, or
red.
The USB LED is unlit 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 glows a steady green if a valid USB connection is made and the Reference 3000's
communication processor is receiving power through the USB cable.
The USB LED flashes orange whenever the Reference 3000 is receiving or transmitting valid USB messages to
or from the host computer. It does 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 indicates a solid RED in one special condition: when a firmware download is taking place.
Caution:
Do not turn off the Reference 3000, do not unplug the USB cable, and do not stop the operation of the
host computer when the USB LED is a continuous red color.
Do not interrupt a firmware update that is in progress. An incomplete update can render a Reference
3000 inoperable until it is returned to Gamry for reprogramming.
Should the firmware update be interrupted, contact Gamry before starting the return process.
Cell On LED
The Cell On LED glows yellow whenever the Reference 3000 is actively applying voltage or current to the
electrochemical cell attached to the Cell Cable. Avoid touching the cell cable leads whenever the Cell On LED
is lighted, because the quality of the data collected in your experiment may be compromised.
The Cell On LED does not indicate a dangerous condition when it is lighted. The voltages put
out by a Reference 3000 are generally considered safe. Still, avoid touching the cell leads when the cell is
on.
If you need to make changes to your cell leads, do this between experiments, when the Cell On LED is off and
the potentiostat is inactive.
In a typical experimental sequence, the Cell On LED is off between experiments and during any open-circuit
potential measurements. It glows yellow whenever the cell is polarized.
Overload LED
The Overload LED is normally unlighted. When it glows red, this indicates that some circuit in the Reference
3000 has exceeded its normal operating limit. Conditions that generate Overloads include:
Panel Indicators and Connectors – Front Panel
Interrupting a firmware update can cause a catastrophic failure of your system.
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