ALAT UJI Onset HOBO UX100-001, Manual

HOBO Temp Data Logger (UX100-001) Manual 

3.

Select the Low Level 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 
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: 

•

Once the logger is launched, the high and low burst 
logging levels 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 levels, the burst 
logging will not begin until the next 15-second refresh 
cycle. 

•

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 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 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 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 
logger will take a temperature 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: one temperature 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). 

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.