      HUBBARD COMMUNICATIONS OFFICE

Saint Hill Manor, East Grinstead, Sussex



      HCO BULLETIN OF 11 MAY 1969R

           REVISED 8 JULY 1978



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                TECH DIVISION

                QUAL DIVISION



               METER TRIM CHECK



E-Meters can go out of trim during a session because of temperature 

changes.



Thus, even if the meter is properly calibrated and reads at 2.0 with 

a 5,000 ohm resistor across the leads and 3.0 with 12,500 ohms, by 

the end of the session a pc can be apparently reading below 2.0 

because the meter is off trim.



The following meter procedure is therefore to be followed AT THE END 

OF EACH SESSION (AFTER GIVING "END OF SESSION"):



1. DON'T MOVE THE TRIM KNOB



2. PULL OUT THE JACK PLUG



3. MOVE THE TA UNTIL THE NEEDLE IS ON "SET" AT THE SENSITIVITY YOU 

WERE USING IN THE SESSION



4. RECORD THE TA POSITION AT THE BOTTOM OF THE AUDITOR'S REPORT FORM 

AS



    "Trim Check - TA = ______"



5. IF YOUR METER IS KNOWN TO BE OUT OF CALIBRATION (as in paragraph 

two above), RECORD ALSO "Calibration error - ______ on meter = 2.0 

actual" at the bottom of the form.





L. RON HUBBARD

Founder



LRH:lb-r.cs.an.ei.cden.nc.gm



