User Manual

2400 Series SourceMeter
®
User’s Manual Connections 2-5
NOTE To avoid redundancy, generic SourceMeter drawings will be used in this
section. A generic drawing excludes the labeling for the terminal voltage
differentials.
Sensing methods
Basic source-measure operations are performed using either 2-wire local sense
connections (Figure 2-2) or 4-wire remote sense connections (Figure 2-3). The
factory default sense selection is local. See “Sense selection,” page 2-12, to
check and/or change the sense selection. Also, see Section 4 for “Ohms sensing”
issues.
WARNING There is no internal connection between earth ground and the
selected INPUT/OUTPUT LO terminal of the SourceMeter.
Therefore, hazardous voltages (>30V rms) can appear on that
LO terminal. Typically, this can occur when the SourceMeter is
operating in any mode where the output changes rapidly, such
as quick, pulsed waveforms that can be generated using the
ZERO, AUTO-OFF output state, or fast pulse sweep operations.
To prevent this from occurring (if your application allows it),
connect the INPUT/OUTPUT LO terminal to earth ground. You
can connect the LO terminal to the chassis ground screw ter
-
minal on the rear panel, or to a known safety earth ground.
Note that the front panel terminals are isolated from the rear
panel terminals. Therefore, if you are using the front panel ter
-
minals, ground the front panel LO terminal. If using the rear
panel terminals, ground the rear panel LO terminal.