Datasheet

Section 6: Rechargeable battery measurements Model 2461 Interactive SourceMeter® Instrument User's Manual
6-4 2461-900-01 Rev. A / November 2015
Device connections
To set up the test, connect the Model 2461 to the battery as shown in the following figure. Make a
4-wire (remote sense) connection from the instrument terminals to the battery to eliminate the effects
of the lead resistance. This allows you to measure the battery voltage as closely as possible to the
terminals of the instrument.
Figure 27: Schematic for the Model 2461 battery application
To prevent electric shock, test connections must be configured such that the user cannot
come in contact with conductors or any device under test (DUT) that is in contact with the
conductors. It is good practice to disconnect DUTs from the instrument before powering the
instrument. Safe installation requires proper shields, barriers, and grounding to prevent
contact with conductors.
There is no internal connection between protective earth (safety ground) and the LO
terminals of the Model 2461. Therefore, hazardous voltages (more than 30 V
rms
) can appear
on LO terminals. This can occur when the instrument is operating in any mode. To prevent
hazardous voltage from appearing on the LO terminals, connect the LO terminal to
protective earth if your application allows it. You can connect the LO terminal to the chassis
ground terminal on the front panel or the chassis ground screw terminal on the rear panel.
Note that the front-panel terminals are isolated from the rear-panel terminals. Therefore, if
you are using the front-panel terminals, ground to the front-panel LO terminal. If using the
rear-panel terminals, ground to the rear panel LO terminal.
Be aware that hazardous voltages can appear on the LO terminals even if the terminals are
not presently selected. The TERMINALS FRONT/REAR switch selects the active terminals
for the measurement. It does not disconnect the terminals.
The maximum input voltage between FORCE/SENSE HI and FORCE/SENSE LO 105 V
peak
.
Exceeding this value may create a shock hazard.
The maximum common-mode voltage (the voltage between FORCE/SENSE LO and chassis
ground) is 250 V
peak
. Exceeding this value may cause a breakdown in insulation that can
create a shock hazard.