ANSI STM4.1:2017 pdf free download – Worksurfaces – Resistance Measurements (Including Shelving and Mobile Equipment)
7.2.3 Identification of Measurement Positions Identify the four sets of measurement positions as indicated in Figure 2. For Figures 2(A) and 2(B) find the geometric center of the sample then measure 1 27 mm (5 inches) in both directions for the test point(s) locations. For Figures 2(C) and 2(D), position the first electrode 51 mm (2 inches) from each edge of the worksurface and place the second electrode in the opposite corner 51 mm (2 inches) from each edge.
7.2.4 Connect one end of the first test lead to the positive terminal of the meter and the other end of the first test lead to an electrode. Connect one end of the second test lead to negative terminal of the meter and the other end of the test lead to the other electrode
7.2.5 Place the electrodes in the positions indicated in Figure 2(A). Set the meter to 10 volts. Energize the meter. If the indicated resistance is less than 1 .0 x 1 0 6 ohms, record the value after 5 seconds and continue with the next specimen or next step of the procedure. If the indicated resistance is equal to or greater than 1 .0 x 1 0 6 ohms, de-energize the meter. Energize the meter at 1 00 volts. Record the resistance after the instrument’s known electrification time or a maximum of 1 5 seconds. NOTE: If switching the test voltage to 1 00 volts results in a resistance reading of less than 1 .0 x 1 0 6 ohms, then the reading made with the 1 00 volt test voltage is used.
7.2.8 Report the resistance reading for each set of measurement positions. Report minimum, mean and maximum values in ohms at low and moderate relative humidity for each specimen. Report temperature and relative humidity at the time of testing, actual duration of conditioning and test equipment (e.g., meter manufacturer and model number) used.
8.1 .3.1 Shelving with direct connection to the groundable point. Connect one end of the second test lead to the negative terminal of the meter and the other end of the test lead to the groundable point. See Figure 3.
8.1 .3.2 Shelving with a series connection through another technical element (e.g., flooring) to the groundable point. Connect one end of the second test lead to the negative terminal of the meter and the other end of the test lead to the stainless steel plate which is in contact with the groundable point. See Figure 3.
8.1.4 Set the voltage to 1 0 volts. Energize the meter. If the indicated resistance is less than 1 .0 x 1 0 6 ohms, record the value after 5 seconds and continue with the next shelf. If the indicated resistance is equal to or greater than 1 .0 x 1 0 6 ohms, de-energize the meter. Energize the meter at 1 00 volts. Record the resistance after the instrument’s known electrification time or a maximum of 1 5 seconds. NOTE: If switching the test voltage to 1 00 volts results in a resistance reading of less than 1 .0 x 1 0 6 ohms, then the reading made with the 1 00 volt test voltage is used.