Collecting Statistics On Measurements - Fluke 8845A User Manual

8845A/8846A
Users Manual

Collecting Statistics on Measurements

The statistical analysis function displays the minimum and maximum measurements of a
series of Meter measurements. The Meter also calculates an average and a standard
deviation value for the same measurement series. This function also provides control over
the starting and stopping of the measurement series.
Starting the Measurement Collection
To start the statistics process:
1. Press J to display the Meter's analysis menu.
2. Press the STATS soft key.
While a series of measurements are being collected, the process can be stopped by
pressing the STOP soft key. To start calculations on another series of measurements,
press the RESTART soft key.
Reading the Min, Max, Std. Dev. and Avg. Values
As the measurements are collected, the display is continually updated with the latest
statistical data as shown below.
The minimum, maximum, average, and standard deviation is displayed along with the
number of measurements the statistics were calculated on.
Stopping Measurement Collection
There are two methods of stopping the collection of measurements for the statistics
function.
To manually stop the measurement collection, press the STOP soft key from the
statistics menu. The display will update with the final set of statistical data.
The process can also be stopped automatically by entering the number of samples on
which you want to calculate statistics. To enter the number of statistic samples:
1. While in the statistics function, press #SAMPLES.
3-10
The Meter starts collecting data immediately. Individual readings are never stored in
the Meter, but each reading is added to the Average and Standard Deviation
calculation. At the same time, the measured value is compared to the values stored in
the minimum and maximum registers, and overwrites one of these values if it is
lower than the minimum value or greater than the maximum value.
F1
To select the digit to adjust, press the soft key labeled either <-- or -->.
With the desired digit selected, press the soft key labeled -- to decrement the digit
or ++ to increment the character.
F2 F3 F4 F5
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