Newport 841-P-USB, Руководство пользователя

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12
Table 2.1. Statistical Parameters
Statistical Parameters Power Energy Definition
Maximum value
 
Highest value in the sample period, E
max
or
P
max
Minimum value
 
Lowest value in the sample period, E
min
or P
min
Average value
 
Rolling average of values in the sample, E
avg
or P
avg
Standard Deviation
 
A measure of the spread of the data around
the average.
RMS stability
 
Root mean square stability represents the
standard deviation as a percent of the
average.
100
 
avg
E
STD
RMS
,
100
 
avg
P
STD
RMS
PTP Stability
 
Shows the spread between the highest and
lowest point in the sample as a percent.
100
min max



avg
E
E E
PTP
,
100
min max



avg
P
P P
PTP
Time

Time elapsed since beginning the sample.
Repetition Rate

Frequency of pulses coming from the laser,
PRR
To
Activate the Statistics,
select
Statistics
from the
Ctrl
menu, and then
select
Start
in the submenu. Statistics are stopped as a default.
The 841-P-USB starts compiling statistics on your measurements as soon as
the
Statistics mode
is activated. Select
Stop
in the same submenu to turn the
Statistics mode off. When you stop the statistics, the last values remain in the
statistics display window for you to view later. If you click
Start
again, the
841-P-USB will restart the statistics from zero.
The 841-P-USB uses default sample parameters unless you set them yourself.
Selecting
Statistics
in the
Display
menu opens the
Statistics
window.
To
Set the Data Sample Parameters,
select
Data Sampling
from the
Settings
menu
.