HP 3562A Operating Manual page 300

OVRLP%-determines the percentage of the time record that is used for over­
lap processing, from 0 to 90%. The percentage selected determines the
portion of each time record overlapped with the next time record in the
averaging. There may be some difference between the requested overlap
percentage and the percentage actually achieved. The achieved percent­
age is displayed on the screen and is always equal to or less than the
requested percentage. The default percentage is 0%. When averaging is
off, the analyzer overlaps as much as possible, regardless of the setting of
OVRLP% (except for capture and throughput measurements, which use
the value of OVRLP%). The overlap percentage readout at the top of
measurement displays shows the overlap between the last two averages
only.
PEAK HOLD-selects the peak hold function, which yields a composite spectrum
containing the maximum values that occurred during the measurement in
each of the display lines. Peak hold continues until the selected number of
averages have been computed (this is the difference between peak hold
and continuous peak). Note that peak hold can be applied only to fre­
quency response and power spectrum measurements.
PRVIEW OFF-deactivates manual or timed previewing. When previewing is off, the
measurement includes all time records, without waiting for your approval.
The possible exception to this is overload rejection; see OV REJ ON OFF.
RETURN-redisplays the first level of the AVG menu.
STABLE (MEAN)-selects stable averaging, which weights old and new data equally
to yield the arithmetic mean at each display line for the number of averages
calculated. If PAUSE CONT is pressed before the specified number of
averages have been calculated, the measurement pauses at the comple­
tion of the current average. Pressing PAUSE CONT again resumes the
measurement at the next average. The formula used to calculate stable
averaging is:
"quantity is time record when time averaging is on; power spectrum, fre­
quency response or correlation when time averaging is off.
where An cumulative average
=
O n current quantity'
=
n number of averages
=
Chapter 12-0perating Reference
(conI)
AVG
12-11