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