4
Remote Operations Using the IEEE 488 Interface
Syntax Diagrams of Math Functions
Standard Deviation
Each of these queries recalls the stored standard deviations for a block of readings.
DEVTN? READING
DEVTN? ABSOLUTE
adj363f.eps
Recall Standard Deviation
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.
Note
To obtain a valid standard deviation value the AvR or BlocN avarage mode
must be configured and enabled.
Syntax Diagrams of Math Functions
Note
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.
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