6. Press ENTER once again. This will return you temporarily to a display of the "live"
analog input.
7. Press ANY KEY EXCEPT CAL OR SETUP. This will freeze the displayed data
value.
8. Using the NUMERIC BUTTONS as explained in Section 1.e, change the displayed
value to "0" (zero).
9. Press ENTER. The display will return to "OFSET." Now press CAL. The unit will
display the word "FORCE":
10. Press ENTER. The unit will display the mnemonic for "SHUNT CALIBRATION—
POSITIVE":
11. Press ENTER. The display will show the status of the positive shunt: "ON" means
that the shunt is connected; "OFF," that it is not. If the positive shunt is currently
OFF, turn it ON by pressing the top or bottom segment of any displayed charac-
ter, followed by ENTER. The unit will display the mnemonic for "SHUNT CALIBRA-
TION—NEGATIVE":
12. Press ENTER. The display will show the status of the negative shunt (it should be
OFF, since you just turned ON the positive shunt). Press ENTER. This will return
you temporarily to a display of the "live" analog input.
13. Record the currently displayed data reading.
14. Press ENTER. This will freeze the displayed data reading.
15. Press ENTER twice to return to "SHP."
16. Press ENTER and turn OFF the positive shunt by pressing the top or bottom seg-
ment of any displayed character, followed by ENTER.
17. 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.
18. Now adjust the rear-panel SYMMETRY control until the negative value of the read-
ing you recorded in Step 13 appears.
19. Press CAL. The display will return to "OFSET." YOU ARE NOW READY TO CALI-
BRATE THE 3578, AS EXPLAINED IN SECTION 4.c. Note that the negative shunt
was automatically turned OFF when you pressed the CAL button.
4.5
SETUP: INSTRUMENT CALIBRATION
4
4.b PHASE AND SYMMETRY ADJUSTMENT OF THE MODEL 3578
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