Download 1085-150 Heat Capaci..

Chapter 5
Creating and Using Calibration Files
Section 5.2
Overview of Puck Calibration
Hence, the Helium-3 thermometer must be fully field corrected for this procedure to work. Similarly,
to perform this calibration without the Helium-3 system, the standard PPMS block thermometer must
be field corrected.
Each time you execute the Field Calibrate sequence command, additional field calibration data is
saved to the current .cal file. Once the thermometer is calibrated at a specific field, repeating it at
that field again is unnecessary. The calibration data is permanently stored in the .cal file.
Additional calibration tables may be added at any time and in any order. Keep in mind, however, that
the old calibration data remains as part of the .cal even when new calibration data is added at the
same field. This may result in unexpected behavior if calibrated more than once at the same field.
You may delete unwanted field calibration data from the Advanced menu on the Calorimeter Files
dialog (see Fig. 5-1).
Simple linear interpolation is used if a heat capacity measurement is requested at a field that lies
between calibration fields. For example, if you execute the Field Calibrate sequence command at
both 80,000 and 90,000 Oe and subsequently perform a heat capacity measurement at 85,000 Oe, a
linear interpolation of the thermometer corrections at the two neighboring fields would be used to
synthesize an approximate correction at 85,000 Oe. However, for the best accuracy, it is
recommended that measurements be performed at fields corresponding to the calibration values.
5.2.8
Compatibility of Electronics: DSP Board and Model 6500 vs. Model
CM-E HC Module.
There are two different types of Heat Capacity Controller Electronics. Older systems use a DSP card
that resides in the Model 6500 Option Controller. Newer systems use a Model CM-E Heat Capacity
CAN Module. A .cal file created with one type of controller CANNOT be used with the other type of
controller. If you intend to use pucks that were calibrated with the other DSP controller, you will need
to recalibrate them for use with the CM-E HC Module.
Quantum Design
PPMS Heat Capacity Option User’s Manual, 1085-150, Rev. L3
October 2010
5-5