SourceMeter® Instrument User's Manual Section 8:
Rechargeable battery measurements
2450-900-01 Rev. E / August 2019 8-3
If you are using the current source to charge or discharge batteries, the following precautions
must be observed. Failure to observe these precautions could result in instrument damage
that is not covered by the warranty.
Make sure the external voltage never exceeds the voltage limit setting of the current source.
This will cause excessive current to be drawn from the external battery or source.
Be sure to set the output-off state of the current source for high impedance. This setting
opens the output relay when the output is turned off. With the normal output-off state
selected, turning the output off sets the voltage limit to zero. This 0 V source limit condition
will cause excessive current to be drawn from the external battery or source.
Carefully consider and configure the output-off state, source, and limits before connecting
the 2450 to a device that can deliver energy. Devices that can deliver energy include voltage
sources, batteries, capacitors, and solar cells. Configure instrument settings before making
connections to the device. Failure to consider the output-off state, source, and limits may
result in damage to the instrument or to the device under test (DUT).
When using the current source as a sink, always set the voltage limit and configure
overvoltage protection (OVP) to levels that are higher than the external voltage level. Failure
to do so could result in excessive current flow into the 2450 (> 105 mA) and incorrect
measurements. When the instrument is operating in limit, be aware that the instrument
always tries to maintain the limit.
Equipment required
• One 2450 SourceMeter
®
Instrument
• For front-panel connections, use four insulated banana cables, such as the Keithley Instruments
Model 8608 High-Performance Clip Lead Set (one set included with the 2450; you will need
another set)
• For rear-panel connections, use four triaxial cables
• One GPIB, USB, or ethernet cable to connect the 2450 to a computer
• One rechargeable 2300 mAh AA (1.2 V) battery to test
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