## How to read a Surface Resistance Meter.

The Decade Scale is shorthand for electrical measurements, displayed in powers of 10

and described in “Ohms”. A Surface Resistivity Meter is used to take these electrical measurements on all types of surfaces and materials, and the results are displayed in the Decade Scale. Â Most meters will display results using colored LEDs that brighten according to each decade.Â  These measurements are important in ESD control because this is how to classify a material as Conductive, Dissipative or Insulative.

Ohms are the units used to describe the Â measurements of electrical resistance and has a symbol that looks like this “Î©”.Â  Depending on the value, measurements can be in “kilohms”, or “meg ohms”.Â  The decade scale can be written in several ways and mean the same:Â  105 , 10^5, 100 kilohms, or 100megÎ© etc. The table below shows all the values important as it pertains to ESD or Static Control:

 Color- typical for most meters) Indicating Function ohm Green Conductive 10^3-10^5 Yellow Dissipative: ideal test measurement 3×10^5-10^9 Orange Dissipative but nearing insulative level 3×10^9-10^10 Red Near insulative to insulative 10^11-10^12

10^3Â Â Â Â Â  =1 kilohm
10^4Â Â Â Â Â  =10 kilohm
10^5Â Â Â Â Â  =100 kilohm
3×10^5Â  =300 kilohm
10^6Â Â Â Â Â  =1 meg ohm
3×10^6Â  =3 meg ohm
10^7Â Â Â Â Â  =10 meg ohm
3×10^7Â  =30 meg ohm
10^8Â Â Â Â Â  =100 meg ohm
3×10^8Â  =300 meg ohm
10^9Â Â Â Â Â  =3000 meg ohm
3×10^9Â  =1000 meg ohm
10^10Â Â Â  =10,000 meg ohm
10^11Â Â Â  =100,000 meg ohm
10^12Â Â Â  =1,000,000 meg ohm