User Manual

HOBO 4-Channel Thermocouple Data Logger (UX120-014M) Manual
1-800-LOGGERS 7 www.onsetcomp.com
5. Repeat steps 2 through 4 for any additional thermocouple
sensors.
6. Set the burst logging interval, which must be less than the
logging interval. Select either a preset burst logging interval
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.
7. 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 four thermocouple
channels 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 burst logging 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
sensor values every 5 minutes. In addition, the logger will take
a sample every 30 seconds and temporarily store it in memory.
The logger will then calculate the maximum, minimum,
average, and standard deviation using the samples gathered
over the previous 5-minute period and log the resulting
value(s). When reading out the logger, this would result in 5
data series for each thermocouple channel: one thermocouple
series (with data logged every 5 minutes) plus four maximum,
minimum, average, and standard deviation series (with values
calculated and logged every 5 minutes based on the 30-second
sampling).
Note: Statistics are available on the four thermocouple
channels only; they are not available on the internal 10K
thermistor (temperature) channel.
To set up statistics:
1. Select Statistics for Logging Mode in the Launch Logger
window. If Statistics has already been configured for this
logger, click the Edit button in the Launch Logger window.
2. Click the Maximum, Minimum, Average, and Standard
Deviation checkboxes for each of the statistics you want to
calculate during logging. Note that Average is automatically
enabled when selecting Standard Deviation. In addition, the
more statistics you record, the shorter the logger duration
and the more memory is required.
3. Set the sampling interval, which must be less than and a
factor of the logging interval. Choose either a preset
sampling interval or select Custom and enter your own
sampling interval. Keep in mind that the more frequent the
sampling rate, the greater the impact on battery life.
4. 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.
Once logging begins, click the Alarm/Stats button on the logger
to cycle through the current maximum, minimum, average, and
standard deviation data on the LCD screen. You can plot the
statistics series once you read out the logger.
Reading Out the Logger
There are two options for reading out the logger: connect it to
the computer with a USB cable and read out it with HOBOware,
or connect it to a HOBO U-Shuttle (U-DT-1, firmware version
1.20m030 or higher) and then offload the data files from the
U-Shuttle to HOBOware. Refer to the HOBOware Help for details.