Chapter 6 -- Panel Indicators and Connectors--Rear Panel
6 - 4
We recommend that you always use the power adapter (power brick) supplied with your Reference 3000 to
power to the instrument.
Input power from the power adapter comes from your AC power main. The power adapter supply is rated for
operation from 100 to 240 volts AC, at frequencies from 47 to 63 Hz. It should therefore be useable
worldwide.
While a Reference 3000 may work with other power sources, we cannot guarantee it will work to its full
specifications. If you have to use the Reference 3000 with a different supply, make sure that the supply is
regulated, has an output between 22 and 26 volts, and supplies at least 5 amps of load current. Inrush current
drawn by the Reference 3000 at “power on” has been known to cause improper operation of an external
power supply, even though the supply is rated for more than 5 amps of output current.
Power Switch
The Power switch is located just below the Power In jack. It switches the power from this jack to the input of
the Reference 3000’s DC-DC converter.
Normally, the DC Power is connected before the Power Switch is turned ON. However, no damage will occur
if this switch is already in the ON position when the DC Power is connected, or when the AC power input is
connected to the external power supply.
Chassis Ground
The rear panel Chassis Ground is intended for one use only. When the Reference 3000 is used with cells
isolated from earth ground, connecting the chassis ground to earth ground may lower the noise measured in the
system. Note that the chassis of the Reference 3000 is connected to Floating Ground. See Chapter 1, for safety
information concerning this connection.
Either a banana plug or the stripped end of a wire can be connected to the Chassis Ground binding post. The
other end of the wire is then connected to earth ground.
A black banana-plug to banana-plug lead has been provided with your Reference 3000. You may find it useful
when making this earth ground connection.
USB Port
The USB port on the rear panel of the Reference 3000 is a Type B connector as defined in Revision 1.1 and 2.0
of the USB Specification. You use a standard, shielded, Type A/B cable to connect this port to a computer’s
USB port or a USB hub (preferably an externally powered hub). The two ends of a Type A/B cable are
CAUTION
If your facility owns both Gamry Reference 600’s and Reference 3000’s, you must
insure that the smaller power adapter from the Reference 600 is not used to power a
Reference 3000. The Reference 3000 will not power up with the smaller adapter.
Fortunately, neither the Reference 3000 nor the small power adapter will be damaged
if connected in error.
The power adapter for the Reference 3000 is almost 22 cm long. The largest
dimension on the Reference 600 power adapter is 11 cm.
WARNING
Power input voltages less than 20 volts or greater than 32 volts can damage the
Reference 3000’s DC-DC power supply.
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