Test process of surface resistance tester
1. Preparation before test
1. Insert the power plug into the power socket on the back of the instrument, and place the power switch in the off position;
2. The working mode switch is in the "short circuit" position;
3. The shielded wire plug of the manual test frame is connected to the input socket of the electrical box;
4. Perform certain treatment on the test sample (such as sandblasting and cleaning, etc.);
5. Adjust the indoor temperature and humidity to meet the test requirements.
Two, test
First put the power switch in the open position and the measurement selection switch is set to "short circuit", and a digital display appears, and the power is turned on for half an hour.
1. Place the sample, press down the probe, place the measurement selection switch in the "measurement" position, and place the polarity switch above the switch;
2. Select the appropriate voltage range and current range, the digital display is basically "000", if there is a number at the end, you can turn the zero adjustment knob to make the pulse "000";
3. Set the working mode switch to "I adjustment", press the current switch, and turn the current adjustment knob to make the number display "1000", which is the full-scale value of each current range;
4. Press down the polarity switch again, so that the digital display is also 1000 ± 1, exit the current switch, and set the working mode switch to 1 or 6.28 (when the probe spacing is 1.59mm, set it to 1 position and the spacing is 1mm when it is 6.28 Position); (After adjusting the current, the above steps do not need to be repeated in subsequent measurements; as long as the adjustment is completed, press the current switch, and the measured value can be directly read by the digital display.)
5. If the digital display goes out and only "1" is left, it means that the voltage value exceeds the range, and the voltage range switch can be set to a higher level;
6. After reading, turn the polarity switch to the other side, you can read the measured value of negative polarity. The average of the two measured values is the resistivity value of the sample at that place.
Three, matters needing attention
1. When pressing down the probe, the pressure should be moderate to avoid damage to the probe;
2. Since the surface resistance of the sample may be unevenly distributed, a few more points should be measured for one sample and then the average value should be taken;
3. The actual resistivity of the sample is also related to its thickness, and it is necessary to check the thickness correction coefficient in the appendix for correction.