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was furthest out of range for the sensor before the alarm
cleared (see the Points table for the actual value).
• Alarms can only be configured on the thermocouple
channel; they are not available for the internal 10K
thermistor (temperature) channel.
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 5-minute
logging interval and burst logging is configured to log every 10
seconds when the temperature goes above 2,000°F (the high
limit) or falls below -200°F (the low limit). This means the logger
will record data every 5 minutes as long as the temperature
remains between 2,000°F and -200°F. Once the temperature
reaches 2,100°F, for example, the logger will switch to the
faster logging rate and record data every 10 seconds until the
temperature falls back below the high limit (or 2,000°F in this
case). At that time, logging then resumes every 5 minutes at
the normal logging interval. Similarly, if the temperature falls to
-250°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 -200°F, the logger will then return to
normal mode, logging every 5 minutes. To set up burst logging:
1. Select Burst for Logging Mode in the Launch Logger
window. If Burst has already been configured for this
logger, click the Edit button in the Launch Logger window.
Note that you cannot set up alarms with burst logging. You
also cannot select the Stop Logging option "Never (wrap
when full)" if burst logging is configured.
2. In the Burst Logging window, select the High Limit checkbox
if you want to set up a condition in which burst logging will
occur when the sensor reading rises above the high limit
value. Type in the value or drag the red upper slider.
3. Select the Low Limit checkbox if you want to set up a
condition in which burst logging will occur when the sensor
reading falls below the low limit value. Type in the value or
drag the blue lower slider.
4. Set the burst logging interval, which must be less than the
logging interval. Select either a preset burst logging interval
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or select Custom and enter your own interval. Keep in mind
that the more frequent the burst logging rate, the greater
the impact on battery life and the shorter the logging
duration.
5. Click OK when done. This will return you to the Launch
Logger window. Click the Edit button next to Logging Mode
in the Launch Logger window to make additional changes.
Notes:
• Burst logging is available on the thermocouple channel
only; it is not available for the internal 10K thermistor
(temperature) channel.
• Once the logger is launched, the high and low burst
logging limits are only checked when the logger's
LCD screen refreshes once every 15 seconds. Therefore,
if you set the logging interval to less than 15 seconds and
the sensor reading falls outside the limits, the burst
logging will not begin until the next 15-second refresh
cycle.
• The actual values for burst logging limits are set to the
closest values supported by the logger based on the
thermocouple type. In addition, burst logging mode can
begin or end when the sensor reading is within the
resolution specification for each thermocouple type. This
means the value that triggers the alarm may differ
slightly than the value entered.
• Once the high or low condition clears, the logging
interval time will be 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 limit 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 limit. Now back in normal mode, the next
logging interval will be 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 will appear on the plot (if you select
events for plotting in the Plot Setup window) each time
the logger enters or exits burst logging mode.
Statistics
Statistics is a logging mode in which the logger calculates
maximum, minimum, average, and standard deviation statistics
during logging, recording the results at each logging interval
based on samples taken at a rate you specify. This will result in
up to four additional series per sensor that record the following
information at each logging interval:
• The maximum, or highest, sampled value,
• The minimum, or lowest, sampled value,
• An average of all sampled values, and
• The standard deviation from the average for all sampled
values.
For example, let's say the logging interval is set to 5 minutes
and the sampling interval is set to 30 seconds (with maximum,
minimum, average, and standard deviation all enabled). Once
logging begins, the logger will measure and record the actual
temperature sensor values every 5 minutes. In addition, the
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