18. Using the NUMERIC BUTTONS, change the displayed value to the "EQUIVALENT
INPUT" VALUE GIVEN BY THE TRANSDUCER MANUFACTURER FOR THE CALI-
BRATION RESISTOR YOU HAVE INSTALLED (for a discussion of "equivalent input,"
see Section 4.c.3, below). This value should be expressed in the desired engineer-
ing units and with the desired measurement precision.
19. Press ENTER twice to return to "SHP."
20. Press ENTER and turn OFF the positive shunt by pressing the top or bottom seg-
ment of any displayed character, followed by ENTER.
21. Press ENTER once more and turn ON the negative shunt by pressing the top or
bottom segment of any displayed character, followed by ENTER. This will return
you temporarily to a display of the "live" analog input.
22. Now adjust the rear-panel SYMMETRY control to produce a reading equal to the
negative value of the "equivalent input" you entered in Step 18 (or some other spe-
cific negative engineering-unit value, if such a value is given by the transducer
manufacturer for the calibration resistor).
23. Press the CAL button. The display will return to "OFSET" (the negative shunt has
been automatically turned OFF).
24. Move the transducer's "CAL/RUN" Switch to the "RUN" position.
25. With the transducer load still at zero, press ENTER. This will return you temporari-
ly to a display of the "live" analog input.
26. Press ANY KEY EXCEPT CAL OR SETUP. This will freeze the displayed data value.
27. Using the NUMERIC BUTTONS, change the displayed value to "0" (zero). Then
press ENTER. The display will return to "OFSET."
28. Now press CAL. The unit will again display "FORCE."
29. To exit the CAL button sequence and return to the "Setup" display, press SETUP.
THE LEBOW 1800 / DAYTRONIC 3578 SYSTEM IS NOW FULLY CALIBRATED. YOU
NEED NOT PERFORM A SUBSEQUENT "DEADWEIGHT" OR "SIMULATED" CALIBRA-
TION.
4.7
SETUP: INSTRUMENT CALIBRATION
4
4.b PHASE AND SYMMETRY ADJUSTMENT OF THE MODEL 3578
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