Standard Deviation; Syntax Diagrams Of Math Functions; Averaging - Fluke 8508A User Manual

Standard Deviation

Each of these queries recalls the stored standard deviations for a block of readings.
DEVTN? READING
(Nr3) Recalls the standard deviation of the block relative to the mean of the block.
DEVTN? ABSOLUTE
(Nr3) Recalls the standard deviation of the block as an absolute quantity.
To obtain a valid standard deviation value the AvR or BlocN avarage mode
must be configured and enabled.

Syntax Diagrams of Math Functions

Combinations of math operations are allowed, but they must be performed in
the following order:
1. Averaging (AVG)
2. Multiplication (MUL_M)
3. Subtraction (SUB_C)
4. Division (DIV_Z)
5. Decibels (DB).

Averaging

Two forms of averaging are available:
•
Rolling Average
Processes successive readings to provide a measurement which is the arithmetic
mean of the most-recent "R" (4,16, or 64) readings. When the window has filled with
the selected number of readings, the earliest reading is discarded as each new reading
is added. The mean is updated with every new reading.
•
Block Average
Continuously calculates the arithmetic mean of successive readings until a block of
"N" readings is complete, then presents the mean of the whole block. A new block of
N readings is started, but the old block's mean remains on the display until the new
block is completed, when the new mean is presented.
Remote Operations Using the IEEE 488 Interface
DEVTN? READING
DEVTN? ABSOLUTE
Recall Standard Deviation
Note
Note

Syntax Diagrams of Math Functions

adj363f.eps
4
4-25