Two Probe Method for resistivity measurement of insulators at different temperatures

The Two Probe Method is one of the standard and most commonly used method for the measurement of resistivity of very high resistivity samples like sheets/films of polymers. The resistivity measurement of such samples is beyond the range of Four Probe Method.

DESCRIPTION OF THE EXPERIMENTAL SET-UP

1. Two Probes Arrangement, TPA-01

It has two spring load contact probes. These probes move in a pipe and are insulated by Teflon washers. This probes arrangement is mounted in a suitable stand, which also holds the sample plate and RTD sensor. The stand also serves as the lid of PID Controlled Oven. Teflon coated leads are provided for connecting wit High Voltage Power Supply EHT-11 and Digital Picoammeter DPM-111. With this set-up assuming max. Voltage = 1500V; current 10x10-12 A (max) and thicknexx of sample 1mm, the resistivity of the sample could be measured upto 1014 ohm.cm..

2. PID Controlled Oven, PID-TZ

The unit is a high quality PID controller wherein the temperatures can be set and controlled easily. The P, I and D parameters are factory set for immediate use, however, the user may adjust these for specific applications as well as auto-tune the oven whenever required. The steps for these are given in the user manual. Although the controller may be used either for our small oven, up to 200°C or a larger oven up to 600°C, however, in the present setup only small oven is to be used. The controller uses thermocouple as temperature sensor

SPECIFICATIONS OF THE OVEN CONTROLLER

Temperature Range Ambient to 200°C
Display Accuracy ±0.3°C
Setting Type Front push buttons
Control Method PID, PIDF, PIDS
Measurement Accuracy ±0.5°C (typical)
 
Oven Specially designed for Four Set-Up
Sensor Thermocouple (Chromel-Alumel)
Display 7 segment LED, two rows
Values Process Value, PV and Set Value, SV
Power 150W
 
 

3. High Voltage Power Supply, Model EHT-11
Specifications as per datasheet attached

4. Digital Picoammeter, Model DPM-111
Specifications as per datasheet attached
 

The experimental set-up is complete in all respect

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