Installation manual

Manual Part # 800-1402-001 Rev E Page 29 of 48
SPECIAL FUNCTION 4: STATISTICS
PROGRAMMING PARAMETER Pr24 set to 4
The General Purpose Digital Readout can perform some basic statistical
analysis without the use of SPC data collection on a PC or other device. The
DRO’s Statistics mode can provide the following functionality:
1. Measurement Count.
2. Minimum Measurement.
3. Maximum Measurement.
4. Average Measurement in two modes:
a. Standard average (Measurement Sum ÷ Count)
b. Trimmed average ((Measurement Sum - Max - Min) ÷ (Count - 2))
To begin the Statistics mode, complete the following:
1. Clear the statistics variables by pressing the F4 key.
If the variables are already clear, the LCD will display CLr
CLrCLr
CLr.
If there is a previous sample in memory, the LCD will display Cn
CnCn
Cn representing
the measurement count for 1 second followed by a non-zero number.
Press the F3 key to clear the statistics variables. The LCD will display CLr
CLrCLr
CLr for 1
second and then return to normal measurement mode
2. Take a measurement sample and press the F3 key. The LCD displays Add
AddAdd
Add
momentarily to indicate that the measurement has been accumulated. At this
time the measurement is also compared to the current Min and Max values to
determine if it is less than the current Minimum or greater than the current
Maximum. Continue to take additional measurements and press the F3 key
after each measurement.
3. When you are ready to review the statistical data, momentarily press the F4
key. The LCD will display Cn
CnCn
Cn for 1 second followed by a non-zero number. This
number represents the measurement Count.
Press the F4 key again and the LCD will display Lo
LoLo
Lo for 1 second followed by the
Minimum Measurement value.
Then:
a. Press the F3 key to clear statistics variables and exit.
b. Press the F4 key to continue without clearing the statistics variables.
c. Press the SEND key to transmit the Minimum Measurement to the
SPC port.
Press the F4 key again and the LCD will display Hi
HiHi
Hi for 1 second followed by the
Maximum Measurement value.
Then:
a. Press the F3 key to clear statistics variables and exit.
b. Press the F4 key to continue without clearing the statistics variables.