Fluke 8588A Operator's Manual page 93

Reference Multimeter and 8 ½ Digit Multimeter
Features
These features are available in all of the functions: DCV, ACV, DCI, ACI, Ohms,
Capacitance, RF Power, Frequency, DCI Ext Shunt, ACI Ext Shunt, PRT, and
Thermocouple. It is also available in Digitize but Statistics is not available, and
Histogram is replaced with Frequency. See Using Analyze in Digitize Mode.
 (Statistics): When pushed, the Statistics feature is displayed, showing the
Maximum, Minimum, Span (Max – Min), Average, Standard Deviation, and total
number of readings in the data record. Statistics does not start a new record
when first enabled, using data in the current record. A new record is started upon
power-up, a Product reset, and whenever there is a function change, or a change
of parameters in a function. For example, range, resolution and input
characteristics; or when the Trigger subsystem is taken out of the Idle mode. A
convenient way to start a new record (in all functions except Digitize) is to push
. This puts the Product triggering in the Idle mode, then you can push
 once again to put the Product into the free-run triggering mode.
In Statistics,  (Std Dev) determines how the standard deviation displays,
either in the units of the measurement, or in parts per million (PPM). See the
screen below.
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