HOBO
®
U10 Temp/RH Data Logger (Part # U10-003)
© 2005, 2006 Onset Computer Corporation
Part #: MAN-U10-003, Doc #: 11196-A
Inside this package:
• HOBO U10 Temp/RH
Logger
• Mounting kit with magnet, hook-
and-loop tape, and 3/8” double-
sided tape.
Doc # 11196-A, MAN-U10-003
Onset Computer Corporation
Thank you for purchasing a HOBO data logger. With
proper care, it will give you years of accurate and reliable
measurements.
The HOBO U10-003 is a two-channel
Temperature/Relative Humidity Data Logger with 10-bit
resolution and capacity for 52,000 measurements. The
logger uses a direct USB interface for launching and data
readout by a computer.
HOBOware
®
software is required for logger operation.
Visit www.onsetcomp.com for details.
Specifications
Measurement range
Temperature: -20° to 70°C (-4° to 158°F)
RH: 25% to 95% RH
Accuracy
Temperature: ± 0.4°C from 0° to 40°C (± 0.72°F from 32°
to 104°F), see Plot A
RH: ± 3.5% from 25% to 85% over the range of 15° to
45°C (59° to 113°F), see Plot B; ± 5% from 25% to 95%
over the range of 5° to 55°C (41° to 131°F), see Plot B
Resolution
Temperature: 0.1°C at 25°C (0.2°F at 77°F), see Plot A
RH: 0.07% @ 25°C and 30% RH
Drift
Temperature: 0.1°C/year (0.2°F/year)
RH: <1% per year typical
Response time in
airflow of 1 m/s
(2.2 mph)
Temperature: 10 minutes, typical to 90%
RH: 6 minutes, typical to 90%
Time accuracy
Approximately ± 1 minute per month at 25°C (77°F),
see Plot C
Operating range
Logging: -20° to 70°C (-4° to 158°F); 0 to 95% RH
(non-condensing)
Battery life 1 year typical use
Memory 64K bytes (52,000 10-bit measurements)
Weight 26 g (0.82 oz)
Dimensions 45 x 60 x 20 mm (1.8 x 2.38 x 0.77 inches)
The CE Marking identifies this product as complying with
the relevant directives in the European Union (EU).
Temperature Accuracy and Resolution
0
0.5
1
1.5
2
-20-10010203040506070
Temperature (deg C)
Temperature Error (deg C)
resolution accuracy
Plot A
Plot B
-125
-100
-75
-50
-25
0
25
-20 0 20 40 60
Temperature (°C)
Timebase Error (ppm)
Plot C
Connecting the logger
The U-Series logger requires an Onset-supplied USB interface cable to
connect to the computer. If possible, avoid connecting at temperatures
below 0°C (32°F) or above 50°C (122°F).
1. Plug the large end of the USB interface cable into a USB port on the
computer.
2. Plug the small end of the USB interface cable into the side of the logger
as shown in the following diagram.
3. Load and use logger software to operate the logger (see software
manual).
If the logger has never been connected to the computer before, it may take
a few seconds for the new hardware to be detected
Important: If you configure the logger to start with a trigger start, be
sure to press and hold down the button on the front of the logger for at
least three seconds when you want to begin logging. When you release
the button, the light on the side of the logger will flash rapidly to
indicate that logging has begun.
You can read out the logger while it continues to log, stop it manually with
the software, or let it record data until the memory is full.
Refer to the software user’s guide for complete details on launching,
reading out, and viewing data from the logger.
Sample and event logging
The logger can record two types of data: samples and events. Samples are
the sensor measurements recorded at each logging interval (for example,
the temperature every minute). Events are independent occurrences
triggered by logger activity. Examples of events recorded asynchronously
during deployment include: when the logger is connected to the host, when
the battery is low, end of a datafile once the logger is stopped, and button
pushes.
Press the button on the front of the logger for one second to record an
event. Both a “button down” and a “button up” event will be recorded. This
is useful if you want to mark the datafile at a particular point.
The logger stores 64K of data, and can record up to 52,000 samples.
Not Specified
+/- 5%
+
-3.5%
100%
90%
80%
70%
60%
50%
40%
30%
20%
U10 RH Accuracy
0 10 20 30 40 50 60 50
°C
Important: Press this
button for 3 seconds
when logger is
launched with “Trigger
Start” or press for 1
second to record an
event while logging
USB interface
cable plugged
into logger
