Sierra 951 instruction manual Step and Min-Max Switch S3, Zero and Exit Switch S4, Cal Switch S5

SWITCH DEFINITIONS (cont)

Step and Min-Max Switch (S3)

This switch has a dual function. When in the MENU sequence, it steps the digit to be incremented, one position to the right. Using S3 in conjunction with S2 allows rapid updating of all parameter values.

When ��� in the MENU sequence, depressing S3 momentarily displays the maximum and minimum flow readings diplayed since power was applied. These values are stored in static RAMS and are reset when power is applied.

Zero and Exit Switch (S4)

This switch has a dual function. When ��� in the MENU sequence, this switch must be depressed and held for approximately 3 seconds before it zeroes the reading on the display. The ZERO annunciator on the front panel should be illuminated. ZEROing is accomplished by storing the reading just prior to ZEROing. This value is retained in non-volatile memory and recalled when power is applied. It is also used to compensate the StPt control voltage output.

When in the MENU sequence, this switch is used to exit. All values entered prior to exiting, except for the StPt value, will be retained in non-volatile memory and recalled when power is applied.

Cal Switch (S5)

This switch must be depressed and held for approximately 3 seconds to auto-calibrate the readout. When initially held and depressed for 3 seconds the CAL annunciator will extinquish and the display will read the raw data generated by the analog-to-digital converter. When depressed and held again for 3 seconds the CAL annunciator will illuminate and the raw data will automatically be scaled to the CAL value entered previously. (Reference the PROGRAM INSTRUCTIONS page 10 and the CALIBRATION INSTRUCTIONS on page 13 for more information)

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