1.3.5 Temperature Measurement
3
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1.3.5 Temperature
Measurement
Extremely accurate and reliable ultra-low temperature measurements can be
achieved by combining the Model 372 with a negative temperature coefficient (NTC)
resistive temperature device (RTD), such as the Lake Shore Cernox®, Rox™ or germa-
nium temperature sensors. Multiple calibration curves can easily be uploaded to the
Model 372, allowing highly-accurate conversion of sensor resistance to equivalent
temperature, using cubic spine interpolation (an improved interpolation technique
compared to older instruments).
User-generated calibration curves can also be created and loaded into the Model
372, allowing great flexibility in the type of resistive sensors that are used. A maxi-
mum of 39 calibration curves can be stored on the instrument, and when used with a
3726 scanner, up to 17 sensors can be connected simultaneously, each with their
own curve.
1.3.6 Measure a Wide
Range of Resistive
Devices
With up to 21 different current (I) excitation levels available, the Model 372 is able to
perform accurate impedance measurements from several microohms(10
-6
)
) to
many megohms (10
6
)
), all while keeping power dissipation levels to an absolute
minimum.
The addition of full quadrature measurements mean that both the resistive and reac-
tive components of an impedance can now be measured. This enables much better
characterization of the device under test by allowing capacitive or inductive
components to be measured.
FIGURE 1-3
Cubic spline vs. linear interpolation
Ω
K
Precise
interpolation
Cubic spline
Linear
interpolation