The unit "siemens" (symbol: S) is the International System of Units (SI) unit of electrical conductance. Conductance is the reciprocal of resistance, and it measures how well a material allows the flow of electric current. The siemens is the unit of measure for conductance, and it is equivalent to one ampere per volt. A nanosiemens (nS) would be a very small unit of conductance, indicating a high resistance. However, it's important to note that resistance is usually measured in ohms (Ω), and conductance is measured in siemens (S). The relationship between resistance (R) and conductance (G) is given by: G = 1/R So, when you mention "nano siemens," it might be a misunderstanding or a confusion of terms. BTW it was named after a German enginer, Ernst Werner von Siemens.
When performing high resistance testing with a multimeter, you are essentially measuring the resistance of a component or material. This can be useful in various applications, such as testing the insulation of wires or checking the resistance of electronic components. BTW the Fluke 8026B has a 200nS range. The resolution is 0.1nS.
That means that I can read resistance to a resolution of 10% up to 11𝑛𝑆11�� = 1GΩΩ, and see leakage in the 5~10GΩΩ range.
Here's a general procedure for performing high resistance testing with a multimeter:
Select the Proper Range: Most multimeters have different ranges for measuring resistance. Choose a range that is appropriate for the expected resistance value. For high resistance measurements, you'll typically use the highest range available.
Some multimeters have an nS range to take full advantage of the siemens measurement. Your nS range will vary depending on the dmm.
Turn Off Power: Ensure that the circuit or component you're testing is powered off and disconnected from any voltage sources.
Connect the Leads: Connect the test leads of the multimeter to the two points across which you want to measure the resistance. The red lead is usually the positive lead (connected to the higher potential) and the black lead is the negative lead.
Read the Display: Once the connections are made, the multimeter will display the resistance value. If you are measuring high resistance, the value might be displayed in megaohms (MΩ) or even gigaohms (GΩ) if the resistance is very high.
Interpret the Reading: Compare the measured resistance value to your expectations or the specifications of the component you're testing. High resistance readings could indicate good insulation or the presence of an insulating material.
Zero Out: Some multimeters have a "zero" or "null" function that helps compensate for the resistance of the test leads. This can be particularly important for accurate high resistance measurements.
Test for Stability: High resistance measurements can be sensitive to environmental factors like humidity. Make sure the readings stabilize over time if you suspect any external factors might be influencing the measurement.
0.01nS = 100,000 megohms
0.1nS = 10,000 megohms
1nS = 1000 megohms
10nS = 100 megohms
50nS = 20 megohms
Remember that high resistance measurements can be affected by factors like moisture, contamination, and surface conditions. It's essential to follow best practices to ensure accurate and reliable measurements.
Always consult the manual of your specific multimeter model for detailed instructions on performing high resistance testing, as procedures may vary between different multimeter models.