HP HP 8712ET, User Manual, Page: 211 / 480

ET User’s Guide 5-5
Optimizing Measurements
Increasing Sweep Speed
To Reduce the Amount of Averaging
If averaging has been turned on (it is off in the factory preset condition),
reducing the averaging factor (or turning it off altogether) will increase
the analyzer's measurement speed. Averaging requires multiple sweeps
which increases measurement time. Turning off averaging and using a
narrower system bandwidth may produce faster results.
1. Press and enter an averaging factor that is
less than the value displayed on the analyzer screen and press
.
2. If you want to turn the averaging off, press
.
To Reduce the Number of Measurement Points
To reduce the number of measurement points, press
and use the front panel knob, the
keys, or the numeric keypad to enter the reduced number.
Generally, as the number of points is decreased, so is the sweep time.
However, other factors will affect the sweep time such as:
• using frequency bands that contain very low frequencies (below
approximately 20 MHz)
• the number of band crossing points encountered in a sweep (at
approximately 1900 MHz, 2310 MHz, and 2620 MHz) (HP 8714ET
only)
• if the MHz/msec rate is above the maximum rate at which the source
can be swept
The following graph shows an example of the relationship between the
number of points, frequency span, and total cycle time. Total cycle time is
defined as the time from the start of the sweep to the start of the next
sweep. This graph was created with data from a setup on an HP 8714ET
using
conditions, except for number of
points and sweep frequencies, as noted on the graph.
AVG
Average Factor
ENTER
AVG
Average on OFF
MENU
Number of Points
PRESET
Factory Preset