Measurement Computing USB-5100 Series - Manual (Page 22)

USB-5100 Series Software Help Working with USB-5100 Series Data Loggers
Filtered Series Statistics Logging
Can I view the data on the
logger's LCD screen (if
available)?
No, filtered series are only available after the
logger is read out.
Yes, you can press the Alarm/Stats
button on the logger to cycle through
each of the enabled statistics.
What kind of data can be
calculated with this feature? Maximum, minimum, and average; standard
deviation is not available. Maximum, minimum, average, and
standard deviation.
How often can data be
calculated?
By day, hour, minute, or second using
samples taken at the logging interval. The
filter interval should be greater than the
logging interval. It is also recommended that
it is a multiple of the logging interval so that
every filter interval has an equal number of
samples.
Data is calculated at each logging
interval using samples taken at the
sampling interval. The sampling
interval must be less than and a factor
of the logging interval (i.e., if the
logging interval is set to 10 minutes,
statistics cannot be calculated every
hour; the sampling interval would have
to be less than and a factor of 10
minutes).
Can I select different intervals
for each calculated series? Yes, you can select a different interval for
each filter you set up. No, the logging and sampling intervals
apply to all selected statistics.
How is the data recorded?
Sensor data is recorded at every logging
interval and filtered data points are calculated
at the rate you specified (for example, the
average temperature is calculated every hour).
This requires more memory as every sample
is recorded.
The logger takes a sample at every
sampling interval, but only records
statistics data at the logging interval.
This requires less memory as every
sample is not recorded.
Burst Logging
Burst logging is a logging mode that allows you to set up more frequent logging when a specified condition is
met. For example, let's say the logger is recording data at a five-minute logging interval and burst logging is
configured log every 10 seconds when the temperature goes above 85 °F (the high level) or falls below 32 °F
(the low level). This means the logger records data every five minutes as long as the temperature remains
between 85 °F and 32 °F. Once the temperature reaches 90 °F, for example, the logger does switch to the faster
logging rate and record data every 10 seconds until the temperature falls back below the high level (or 85 °F in
this case). At that time, logging then resumes every five minutes at the normal logging interval. Similarly, if the
temperature falls to 30 °F, for example, then the logger would switch to burst logging mode again and record
data every 10 seconds. Once the temperature rises back to 32 °F, the logger does then return to normal mode,
logging every five minutes.
Notes
Burst logging is not available if alarms have been enabled for the logger.
The actual values for the burst logging levels are set to the closest value supported by the logger. For example,
the closest value to 85 °F that the logger can record is 84.990 °F and the closest value to 32 °F is 32.043 °F.
Burst logging mode can begin or end when the sensor reading is within the logger specifications of 0.02 °C
resolution. This means the value that triggers burst logging may differ slightly than the value entered. For
example, if the High Level for a temperature alarm is set to 75.999
° F, burst logging can start when the sensor
reading is 75.994 ° F (which is within the 0.02 ° C resolution).
Once the high or low condition clears, the logging interval time is calculated using the last recorded data point
in burst logging mode, not the last data point recorded in
normal mode . For example, let's assume the logger
has a 10-minute logging interval and logged a data point at 9:05. Then, the high level was surpassed and burst
logging began at 9:06. Burst logging then continued until 9:12, when the sensor reading fell back below the
high level. Now back in normal mode, the next logging interval is 10 minutes from the last burst logging point,
or 9:22 in this case. If burst logging had not occurred, the next data point would have been at 9:15.
A New Interval event displays on the plot (if you select events for plotting in the Plot Setup dialog box) each
time the logger enters or exits burst logging mode.
On thermocouple loggers, burst logging is only available on thermocouple channels and not on the internal
temperature channel.
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