Operator`s manual

can be characterize by the equation used by the DMMReadCJTemp(); t
cj
= b + (V
cjs
– a) / m, the
parameters can be set using DMMSetSensorParams(). V
cjs
is the sensor generated voltage, a, b and m
are the coefficients which are entered using DMMSetSensorParams() and t
cj
the cold junction
temperature. Once set, use DMMReqadCJTemp() to measure the sensor temperature.
4.19 Auxiliary VDC inputs (2064)
In addition to the main voltage input terminals (V+ and V-), the SMU2064 provides two auxiliary voltage
measurement inputs, see Figure 4.25. While the DMM is in 2-Wire Ohms, DCI source or DCV source
functions, invoking one of the standard measurement functions (DMMRead, DMMReadStr or
DMMReadNorm) results in voltage measurement of the top two terminals (V+ and V-). In cases where
additional voltage measurement points are required while in these operations, the I+ and I- terminals can
also be measured by using the DMMReadHiSense function, which returns the voltage present at the I+
terminal relative to the V- terminal. The DMMReadLoSense function returns the voltage present at the I-
terminal referenced to the V- terminal when the DMM is set for 2-Wire or 4-Wire Ohms. The
DMMReadHiLoSense function reads the differential voltage between the I+ and I- terminals. The range
of measurements is limited to of ±2.4V. The accuracy is the same as is specified for the 2.4VDC range.
For higher voltages, it is necessary to provide an external divider network (Figure 4.26). When not in the
above functions, make sure these terminals are disconnected from the application.
Figure 4.24. Testing Amplifier gain and offset using the Auxiliary inputs.
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