Specifications

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION

5.2.2 FRONT PANEL ADJUSTMENT OF ELECTRICAL SIGNALS

5.2.2.1 PRINCIPLES

See Section 5.2.1 for general information on the principles of MFC-CB electrical

signal adjustment.

MFC-CB provides front panel capability to mathematically adjust each of the MFC-CB

electrical output and input signals. The adjustments are accomplished by an adder

and multiplier that is used to offset and adjust the slope of each signal’s response.

The adder (A) and multiplier (M) affect the signal as follows:

Corrected Value = (Uncorrected Value X Multiplier) + Adder

Where:

• Corrected value, uncorrected value and adder are in the current unit of measure.

• Multiplier is dimensionless.

[SPECIAL], <4cal> provides capabilities to view each electrical signal value real time

and edit its adder and multiplier. To calibrate or adjust the electrical signals, compare

their values to a reference and adjust the corresponding adder and/or multiplier as

needed to arrive at acceptable agreement.

As editing adder and multiplier values alters MFC-CB’s calibration, they should only

be edited by qualified personnel as part of the calibration process. Caution should be

taken to avoid accidental editing. For information on preventing access to calibration

information, see Section 3.4.2.

A new MFC-CB is delivered with all calibration adder and multiplier values set to

zero (0) and one (1) respectively. This does NOT mean that the MFC-CB has NOT

been calibrated. For the original factory calibration, privileged factory coefficients are

used for calibration adjustment. This allows a new MFC-CB to be delivered with

“virgin” calibration coefficients of A = 0 and M = 1 for all signals.

To facilitate signal verification and calibration, the view screens of the MFC-CB local

calibration function ([SPECIAL], <4cal>) display the device channel electrical signals

affected only by their calibration adder and multiplier. K factor and adjustment

factors are NOT applied (see Section 7.1).

See Section 7.2 for MFC-CB device channel connector pin outs.