The key points to remember are:
Sample Rate
Measurement frequency
e.g. 10 points/second
Sample Period
Controls the amount of data
for which the statistics are
computed
e.g. 5 minute or 1 day
averages
Total Duration
Controls how long the 841-P-
USB will acquire data and/or
do statistics
e.g. 1 period, or 5 hours
Often the Total Duration and Sample Period will be the same but the 841-P-
USB gives you the flexibility for any application. For example, with the 841-
P-USB you can see 5 minute averages of your laser performance as you
check it during the day and have it stop and hold the last 5 minutes worth of
statistics after 20 hours.
Figure 2.7 Data sampling window
Table 2.2 Data Sampling Parameters
PARAMETER
Choices
Description
Default
Sample Rate
10Hz to 1
per hour
Sets the number of points (measurements) per
second: 10 per second, 1 per second, 1 per 10
seconds, 1 per minute, 1 per 10 minutes, 1 per
hour.
10 (Power)
Sample Period
Integer
1 to
1000000000
The time over which samples are to be averaged.
Sets the number of samples used in the average
and standard deviation
[for example, for each
average to be based on 5 minutes of data, set to
5 minutes..].
10 (Power)
500
(Energy)
Sample period
units
Second
Sets the time period for the value entered above. Minute
(Power)
