Document RaNy5VKGpr63XnwmXn5LEknKX

* ' * Date: II/I7/43 By: HOEsDBH Ref: Material Test: Aroclor Resistivity thodNo. 10,120-43 ^t: B NO. 246-013 Page: 1 1. Disconnect' the leads from the dielectric constant set. (Method No. 10,119-43). 2. After grounding the leads of the resistivity set, connect the red lead to the inner electrode and the blade to the outer. 3. Reinsert the thermometer in the sample, Stir thoroughly, and readjust the temperatures to 100.0 0.5C. Remove the ther mometer and recheck the electrodes to see that they are proper ly spaced. 4 Turn the resistivity apparatus toggle switch to "nw" 5 Set the "Multiplier" knot at "1000" DSW 330917 6. Set the knob at "Check". Balance the "Galvanometer" at 0 by means of the "Zero Adjust" knob. 8. Turn the knob to "Charge" for 5 sec. 9. F. 221 Finally turn the knob to "Operate" and balance the Galvanometer with the "Megohms" dial. It is sometimes necessary also to set Monsanto Chemical Company ANALYTICAL LABORATORY STLCOPCB4077561 1 .__ Date: H/17/43 By: HOH:DBH Ref: WMatrna!: Test: Aroclor Resistivity No. 10,170-43 1 >: B NO. 246-013 Page: 2 the multiplier at a setting other than 1000. c 10. Read the dial (+ 0.05 megohns). 11. Empty the beaker in the waste bucket. 12. Refill the beaker with trichlorobenzene and allow to stand for 5 min. 13. Rinse a second time with trichlorobenzene and return to cabinet. Calculation: 1) Cell constant = (935 - Capacity with air ["Method No. 10,119-4-37) x 11.3 2) Resistivity ** Dial Reading x Multiplier Setting x Cell Constant x 10b The method is accurate to 300 parts in 1000. Report the result to the nearest 25 x lo9 ohms Monsanto Chemical Company F. 221 ANALYTICAL LABORATORY DSW 330918 STLCOPCB4077562