Models 2510 and 2510-AT User’s Manual Connections 2-7
Ground connect mode
Ground connect connects output low to sensor measurement ground, as shown in
Figure 2-5. Without ground connect, the output can float up to ±10V from sensor measure-
ment ground.
Figure 2-5
Ground connect mode
AC ohms measurement
The AC ohms measurement can be used to determine the AC resistance across the OUT-
PUT F+ and F- terminals. This measurement is typically used as a pre-test of Peltier static
resistance before using PID control. The AC ohms measurement can be displayed from the
front panel by configuring the resistance function (Section 3) and via remote by using the
:MEAS:RES:AC? query (Section 9).
As shown in Figure 2-6, the AC ohms command results in a 9.6mA current being pulsed
through the DUT in opposite directions so as to eliminate system voltage offset and mini-
mize temperature change of the Peltier. During thermoelectric (PID) control, dynamic
(DC) resistance can be displayed on the front panel display by pressing the DISPLAY
TOGGLE key or via remote with the :MEAS:RES:DC? query (Section 9).
Figure 2-6
AC ohms measurement
AC
Rectifier
TEC
GND Connect
Measurement
Circuit
DUT
9.6mA
F-
S-
S+
F+
Output
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