1. Probes Arrangement, FPA-03 : It has four individually spring loaded probes. The probes are collinear and equally spaced. The probes are mounted in a Teflon bush, which ensures a good electrical insulation between the probes. A teflon spacer near the tips is also provided to keep the probes at equal distance. The probe arrangement is mounted in a suitable stand, which also hold, the sample plate. To ensure the correct measurement of sample temperature, the RTD is embedded in the sample plate just below the sample. This 2stand also serves as the lid of the temperature controlled oven, Proper leads are provided for the current and

2. DFP 03-Sample :Germanium crystal in the form of a chip.

3. Oven, FPO-03 : This is a high quality temperature controlled oven suitable for Four Probe Set-up. The oven has been designed for fast heating and cooling rates, which enhances the effectiveness of the controller.

4. Four Probe Set-up, DFP-03 : The set-up consists of three units housed in the same cabinet.
OvenController Platinum RTD (A class) has been used for sensing the temperature. A wheatstone bridge and aninstrumentation amplifier are used for signal conditioning. Feedback circuit ensures offset and linearity trimming and a fast accurate control of AR, oven temperature.
Temperature range : Ambientto473k 3Amp. Stability 2 40.5k at 2 Amp. Measurement 1 +1K (typical) at3 Amp. Oven Set-Up Display : 3%digit, 7 segment LED with auto polarity and decimal indication