Installation manual

Operation Manual for LCD Digital Readouts Page 30 of 48
c. Press the SEND key to transmit the Maximum Measurement to the SPC
port.
Press the F4 key again and the LCD will display either AG
AGAG
AG or AAG
AAGAAG
AAG depending on
the setting of the Special Function Option parameter, PR 25.
If PR 25 is set to 0, the Standard Averaging method is used and the LCD
displays AG
AG AG
AG for 1 second followed by the Standard Average: (Measurement
Sum ÷ Count)
If PR 25 is NOT set to 0, the LCD displays AAG
AAG AAG
AAG for 1 second followed by
Trimmed Average ((Measurement Sum - Max - Min) ÷ (Count - 2))
a. Press the F3 key to clear statistics variables and return to measurement
mode.
b. Press the F4 key to return to measurement mode without clearing the
statistics variables.
c. Press the SEND key to transmit the Average Measurement to the SPC
port.
4. Press the F3 key to clear statistics variables and return to a NEW
measurement sequence.
Press the F4 key to return to measurement mode without clearing the
statistics variables and continue.
Notes on the Statistics function:
Standard averaging will be influenced by the Min and Max measurement
values. If these values vary greatly from the measurement population, the
average will not reflect a “centered” representation of the measurement
population.
Trimmed averaging, in this implementation, subtracts the Min and Max values
prior to the averaging calculation. This yields a more “centered” representation
of the measurement population that will be closer to the median value of the
measurement population.
Lack of memory resources has limited this implementation to averaging. Only a
running summation is kept in memory, not the value of each measurement
sample. Because of this, we cannot calculate statistical values such as median
or standard deviation. On the other hand, this implementation allows for a large
number of measurement samples to be accumulated. Measurement count can
be up to 65,536 samples. Measurement summation can be 9.223 x 10
14
mm.