Onset HOBO H22, H22-001 User Manual

9857-H MAN-H22

HHOOBBO

O

®

®

EEnneerrggyy LLooggggeerr

Data Logger & Modules User’s Guide

ii HOBO Energy Logger User’s Guide

DANGER! HIGH VOLTAGE HAZARD!

This logger can be used with sensors that may be installed in an
energized electrical enclosure or on an energized conductor.
Installation of sensors in an energized electrical enclosure or on an
energized conductor can result in severe injury or death. These
sensors are for installation by qualified personnel only. To avoid
electrical shock, do not install or service these sensors unless you are
qualified to do so. Disconnect and lock out all power sources during
installation and servicing. Please read the user’s manual for
instructions and use.

© 2009–2017 O

nset Computer Corporation. All rights reserved.

Onset, HOBO, HOBOware, and FlexSmart are trademarks or registered trademarks of
Onset Computer Corporation for its data logger products and configuration/ interface
software. Keyspan is a trademark of InnoSys Inc. Duracell is a registered trademark of
Duracell. Energizer is a registered trademark of Eveready Battery Company, Inc. All
other trademarks are the property of their respective companies.

This product has been manufactured by Onset Computer Corporation and in compliance
with Onset’s ISO 9001:2008 Quality Management System.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

HOBO Energy Logger User’s Guide iii

Table of Contents

Section 1: Introduction ....................................................... 1

Overview .............................................................................................. 1

Specifications ....................................................................................... 2

Key Features ........................................................................................ 4

Components ......................................................................................... 5

Accessories .......................................................................................... 7

Section 2: Setup and Test .................................................. 9

Requirements ....................................................................................... 9

Steps .................................................................................................. 10

FlexSmart Modules ............................................................................ 11

Launching the Logger ........................................................................ 13

Checking Logger Status ..................................................................... 14

Stopping the Logger ........................................................................... 14

Reading out Data ............................................................................... 15

Verifying Logger Operation ................................................................ 15

Section 3: Modules and Sensors ..................................... 17

Adding and Removing Modules and Sensors .................................... 17

Smart Sensor Cables ......................................................................... 17

Analog (CVIA) Module ....................................................................... 18

Connecting Sensors to the Analog Module ....................................... 19

Configuring Channels on the Analog Module .................................... 20

Verifying Operation ............................................................................ 20

Sensor Excitation ............................................................................... 20

Working with Channels ...................................................................... 22

Section 4: Batteries and External Power ......................... 23

Selecting batteries ............................................................................. 23

iv HOBO Energy Logger User’s Guide

Battery Life ......................................................................................... 24

Maximizing Battery Life ...................................................................... 25

Replacing Batteries ............................................................................ 26

External Power Sources .................................................................... 28

Section 5: Maintenance .................................................... 29

General Maintenance Schedule......................................................... 29

Inspecting the Logger Housing and Cables ....................................... 30

Verifying Sensor Accuracy ................................................................. 30

Cleaning the Logger ........................................................................... 30

Section 6: Reference ......................................................... 31

Time Accuracy ................................................................................... 31

Memory .............................................................................................. 33

Section 7: Diagnostics and Troubleshooting ................. 34

Indicator LED behavior ...................................................................... 34

Problems and Solutions ..................................................................... 36

Index .................................................................................. 39

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 1: Introduction

HOBO Energy Logger User’s Guide 1

Section 1: Introduction

This section discusses the following topics:

• Overview

• Specifications

• Key Features

• FlexSmart Modules

• Smart Sensors

• Components

• Accessories

Overview

The HOBO Energy Logger is a modular, reconfigurable data logging
system used in energy and industrial monitoring applications.

The 15-channel system enables you to quickly and easily perform a
broad range of monitoring applications. You can use the HOBO Energy
Logger with FlexSmart™ modules, which convert signals from many
types of Onset and third-party sensors. You can also use any Smart
Sensor that is compatible with the HOBO Weather station or HOBO
Micro Station.

Note: Although some Smart Sensors are intended mainly for outdoor use
(for example, the Solar Radiation sensor), the Energy Logger is suitable
for indoor use only.

Use HOBOware

®

Pro software to configure and communicate with the
logger. HOBOware allows you to customize configuration settings, launch
the logger, read out the data, and plot or export the data for analysis.

The Energy Logger package includes:

• HOBO Energy Logger

• Energy Logger User’s Guide

• Eight 1.5V alkaline batteries

• One miniature slotted screwdriver

• Blank label

• Rubber feet

Section 1: Introduction

2 HOBO Energy Logger User’s Guide

Specifications

Operating
range

-20° to 50°C (-4° to 122°F) with alkaline batteries

-40° to 60°C (-40° to 140°F) with lithium batteries

Sensor inputs Three FlexSmart multi-channel modules and up to 6

Smart Sensors (which may have multiple

p

arameters/channels)

Sensor
connectors

Six RJ-12 Smart Sensor jacks plus 3 FlexSmart module
slots

Communication RS-232 via 3.5 mm serial port or/and 9-pin D-Sub

connector

Dimensions 15.6 cm x 8.4 cm x 4.6 cm (6.13" x 3.31" x 1.81")

Weight 435 g (15.23 oz) with batteries

238 g (8.33 oz) without batteries

Memory 512K nonvolatile flash data storage

Memory modes Stop when full; wrap when full

Operational
indicators

Six indicators provide logging and sensor network
status

Logging
interval

One second to 18 hours, user-specified interval
(2-second minimum for two-channel S-FS-TRMSA
operation)

Sensor
excitation

12 V DC at 200 mA total, with user-programmable
warmup time on a per-channel basis

Battery life One year typical use (up to 75 mA excitation with 10-

minute or longer logging Interval and 1-second
warmup time)

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 1: Introduction

HOBO Energy Logger User’s Guide 3

Battery type Eight standard AA alkaline batteries included (for

operating conditions

-20°C/-4°F to 50°C/122°F); optional AA lithium

batteries available for operating conditions of -40° to

60°C (-40° to 140°F).

External power Supports optional 13.6 V DC regulated AC Wall

Adapter Connector. Internal batteries may remain

installed. Alternatively, an automotive battery or 9-

12 V DC regulated Wall Adapter may be used, but it is

recommended to remove the internal batteries since

they will discharge to the level of the external supply.

Time accuracy 0 to 2 seconds for the first data point and ±5 seconds

p

er week at 25°C (77°F)

Logging mode Immediate, timed delay, or trigger (button-push) start

options; supports sampling intervals for some sensors

Data
communication

Current readings while logging; read out while logging;

read out when stopped

CE marking identifies this product as complying with

all relevant directives in the European Union (EU).

Section 1: Introduction

4 HOBO Energy Logger User’s Guide

Key Features

Flexible expansion

The logger is not preconfigured. You can use any combination of
FlexSmart modules (up to 3) and Smart Sensors (to a maximum of 15
channels) by plugging them in before logging begins.

Automatic detection of Smart Sensors

The logger automatically recognizes Smart Sensors. No programming,
wiring, or calibration is required to set them up.

Digital network

The connections between the Smart Sensors and the logger are digital,
ensuring accurate, reliable data collection and storage.

Excitation

The Analog module (S-FS-CVIA) supports optional, user-configurable
sensor excitation power and warm up. The logger provides 12 V DC
sensor excitation voltage up to 200 mA for transducers that require
external power for proper operation. Refer to Sensor Excitation on
page 20 for details.

Flexible power capabilities

The logger supports multiple battery types (alkaline, enhanced alkaline,
or lithium) as well as several types of external power sources to allow for
longer deployments while providing increased power for sensor
excitation. Refer to External Power Sources on page 28 for details.

FlexSmart Modules

The logger is compatible with two types of FlexSmart modules, which
can accommodate up to two sensors each. Up to three FlexSmart
modules (in any combination) can be connected to the logger.

The Analog Module (S-FS-CVIA) offers configurable excitation power
and can be connected to any one or two of the following sensors:

The TRMS Module (S-FS-TRMSA) can be connected to the following
compatible AC current and potential (voltage) transformers:

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 1: Introduction

HOBO Energy Logger User’s Guide 5

Smart Sens

ors

The Energy Logger can accommodate up to six Smart Sensors to monitor
temperature, humidity, pressure, current, voltage, pulses, and other
properties. Smart Sensors are automatically detected when logging
begins, and do not require any configuration.

Components

Figure 1: Components

Section 1: Introduction

6 HOBO Energy Logger User’s Guide

FlexSmart Module Ports

Up to three FlexSmart modules can be installed on the logger. These can
consist of any combination of Analog and TRMS modules. Third-party
sensors (available through Onset) are connected to the logger through the
terminals on these modules.

Trigger Button

Hold down the button for at least two seconds to manually start the
logger in the field if the Trigger start option was selected in HOBOware
during launch.

Indicator LEDs

There are three green and three red status indicators. The green indicators
blink to show status or activity. The red indicators blink to show that
battery or memory is low, or that a sensor error has occurred. For more
detailed description of the indicators, refer to Diagnostics and
Troubleshooting on page 34.

Stereo Jack for Serial Cable

The serial interface cable is connected to this port to communicate with
HOBOware or the HOBO U-Shuttle.

RS-232 Jack

This port allows you to connect the logger via a DB9 connector instead
of the stereo jack. The pinout for the logger's RS-232 connector is as
follows:

Pin # Function

1 DCD (Connected internally to 4)
2 RxD (Logger Received Data In)
3 TxD (Logger Transmit Out)
4 DTR (Connected internally to 1)
5 Signal Ground
6 NC
7 RTS (Connected internally to 8)
8 CTS (Connected internally to 7)
9 NC
Shell Logger Chassis Ground

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 1: Introduction

HOBO Energy Logger User’s Guide 7

RJ-12 Jacks

Any combination of up to six Smart Sensors can be installed on the
logger.

External Power Jack

An optional external power adapter can be connected to this port to
power the logger.

Accessories

The following accessories can be used with the HOBO Energy Logger.
These accessories can be purchased from an Onset Authorized Dealer, or
directly from Onset Computer Corporation.

Accessory &
Onset part #

Description

USB Serial Adapter Cables
ADAPT-SER-USB

Allows you to connect the logger to a USB

p

ort on your computer.

Energy Logger Feet
A-H22-MOUNT-1

Allows you to securely mount the logger to
a panel or other surface. Includes screws.

Energy Logger Mounting
Kit
A-H22-DINMOUNT-1

Allows you to mount the logger to
industry-standard 32 mm and 35 mm DIN
rails.

Energy Logger Spares Kit
A-H22-SPARES

Spare bumpers, screwdriver, and
FlexSmart module connector covers.

FlexSmart Analog Module
Spares Kit
A-FS-CVIA-7P

Four 7-pin screw terminals and
screwdriver; lets you leave a sensor
attached to screw terminal for later
connection to module.

Section 1: Introduction

8 HOBO Energy Logger User’s Guide

Accessory &
Onset part #

Description

FlexSmart TRMS Module
Spares Kit
A-FS-TRMSA-4P

Four 4-pin screw terminals and
screwdriver; lets you leave a sensor
attached to screw terminal for later
connection to module.

Energy Logger AC Power
Adapter
P-AC-1

Allows you to power the logger using AC

p

ower, rather than batteries. (100 to 240

VAC, 50 or 60 Hz input.)

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 2: Setup and Test

HOBO Energy Logger User’s Guide 9

Section 2: Setup and Test

Before deploying the logger, read this section thoroughly and follow all
of the procedures at least once. This will ensure that you are comfortable
enough with the logger and with HOBOware software to get the most out
of your deployment. It will also verify that the logger is configured
properly.

Note: Refer to the HOBOware User’s Guide for detailed information
about setup.

Requirements

You will need the following items to prepare the logger for use:

• Eight 1.5V Alkaline Batteries and small Phillips head

screwdriver (for battery door); or external power source

• At least one of the following:

- FlexSmart modules with third-party sensors and

miniature slotted screwdriver

- Smart Sensors

• Serial interface cable (plus USB serial adapter if your computer

does not have a serial port)

• Computer running HOBOware version 2.1.1 or greater

Section 2: Setup and Test

10 HOBO Energy Logger User’s Guide

Steps

To set up the logger, take the following steps:

1. Insert the batteries or connect external power source.

To install batteries, use a Phillips head screwdriver to loosen the
screw on the back of the battery compartment door. Remove the
door. Install eight fresh 1.5 V batteries, being careful to match
the polarity marked in the battery compartment. (Refer to
Selecting Batteries on page 23 for tips on selecting the right
battery type for your application.) Replace the battery
compartment door and tighten the screw to secure it. Do not

over-tighten the screw.

See Batteries on page 23 for more information.

To use an external power source, plug the power adapter into an
electrical outlet or other power source, then plug the power
adapter into the external power jack. See External Power Sources
on page 28.

2. Install FlexSmart modules (if applicable).

You can install up to three FlexSmart modules on the logger.
Modules may be plugged into any slot in any combination. See
Installing FlexSmart Modules on page 11.

3. Attach the third-party sensors to the modules (if applicable).

For information on installing the third-party sensors, refer to
Modules and Sensors on page 17 as well as the instructions that
came with the sensor.

4. Connect the Smart Sensors (if applicable).

Plug up to six Smart Sensors into the RJ-12 modular jacks, or
use splitters to install more than six. (Keep in mind that some
Smart Sensors have more than one sensor channel.) The logger
supports up to 15 sensor channels, plus the logger’s own battery
channel (if selected for logging).

5. Connect to the host computer.

Use the serial interface cable (part # ADAPT-SER-USB) to
connect the logger to a computer running HOBOware. If your

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 2: Setup and Test

HOBO Energy Logger User’s Guide 11

computer does not have a serial port, you can use a Keyspan™
USB serial adapter (part # ADAPT-SER-USB) to connect the
logger to a USB port on your computer.

6. Access the Launch dialog in HOBOware.

In the Launch window, you should see a list of all the Smart
Sensors and FlexSmart modules you connected to the logger.

Note: Modules and smart sensors are listed in HOBOware in ascending
order by serial number regardless of their physical position within the
logger.

FlexSmart Modules

Installing FlexSmart Modules

Remove the protective cap from the module connector on the logger.
Align the connector on the back of the FlexSmart module with the
connector on the logger, and gently press the module into place.

Figure 2: FlexSmart Module

Section 2: Setup and Test

12 HOBO Energy Logger User’s Guide

Configuring FlexSmart Modules

While Smart Sensors are designed and preconfigured for specific
purposes, FlexSmart modules are user-configurable to accommodate a
wide range of Onset and third-party sensors. To take advantage of this
adaptability, HOBOware lets you configure these modules at launch
time, or create and save different configurations to be loaded into the
modules whenever needed.

If you connected only Smart Sensors, skip ahead to the next topic,
“Launching the logger.”

1. Access the Configure Channel dialog in HOBOware.

From the Launch window in HOBOware, double-click a module
name to expand it, then select a module channel and click
Configure.

2. Load an existing configuration, if available.

HOBOware may already have a default configuration for your
sensor. Click the Load button to select an existing configuration
for the sensor.

3. Review the loaded configuration, or create a new one.

The Configure Channel dialog allows you to create or change
the channel name, scaling parameters, and other items. (Refer to
the HOBOware User’s Guide for details.)

4. Review or set excitation power, if applicable.

If this is an Analog module, make sure that the excitation power
settings are correct for the intended sensor.

5. Save the new or changed configuration.

Skip this step if you are using a default configuration without
any changes.

6. Click Configure to complete the configuration.

Repeat these steps for each channel of each module.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 2: Setup and Test

HOBO Energy Logger User’s Guide 13

Launching the Logger

Once all Smart Sensors have been connected and FlexSmart modules
have been configured, access the Launch window in HOBOware and
take the following steps:

1. Select the correct battery type (alkaline or lithium).

If the battery type is not set correctly, the batteries will not report
their power accurately.

2. Review the list of channels.

Make sure all of your sensors and modules are listed in the
Launch window in HOBOware. The FlexSmart modules and
Smart Sensors are listed in ascending order by serial number. If
more than 15 data channels are connected, the devices with the
higher serial numbers will be ignored and their data will not be
recorded. The logger can only record 15 data channels at a time.

3. Log battery voltage (Optional)

If you are using excitation power, you should also log the battery
voltage. This channel does not count towards the 15-channel
limit.

4. Wrap (Optional)

The Energy Logger will stop logging when its memory is full, or
you can enable wrapping. With wrapping enabled, when the
logger’s memory fills up, the newest measurements will
overwrite the oldest measurements.

5. Pre-set Data Assistants (Optional)

Configure pre-set Data Assistants as desired. See the HOBOware
User’s Guide for details.

6. Review other launch settings.

Select logging and sampling intervals, and indicate whether you
want to begin logging now, wait for a timed delay, or a trigger
start. Refer to the HOBOware User’s Guide for more
information about these settings.

7. Click Launch.

Section 2: Setup and Test

14 HOBO Energy Logger User’s Guide

Depending on the option you select, the logger may start
automatically (either immediately or at a specified time), or you
may start it manually by pressing the Push to Start button on the
logger.

Checking Logger Status

You can verify logger status by looking at the indicator lights on the
logger. The LEDs blink to let you know if the logger is waiting for a
delayed or button start, or if the logger is already logging. Other LEDs
blink to warn you when battery power or memory is running low, or if
there is a sensor error. Refer to Indicator LED Behavior on page 34 for
details.

You can get more detailed information about battery power, sensor
readings, and memory in HOBOware at any time, whether the logger is
logging or not. Refer to the HOBOware User’s Guide for details about
the Status window.

Note: In HOBOware, battery capacity is reported differently depending
on the type of batteries being used. For alkaline batteries, the status is
displayed as a percentage of the capacity remaining.

For lithium batteries, capacity is listed as “Good” for 25-100% capacity
remaining, or “Empty” for 25% or less capacity remaining. This is
necessary because lithium battery voltage does not vary much until the
batteries are nearly depleted. Because of the uncertainty in capacity, you
may wish to start each deployment with fresh lithium batteries that you
know are at 100%, rather than rely on old ones.

Stopping the Logger

If wrap is not enabled, the logger automatically stops recording data
when the memory is full. You can also stop the logger manually at any
time by using the Stop command in HOBOware.

Once the logger has stopped, the data remains in the logger until the next
launch.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 2: Setup and Test

HOBO Energy Logger User’s Guide 15

Reading out Data

Use HOBOware to read out data from the logger. Reading out copies
data from the logger to your computer, allowing you to save the data in a
.dtf file and view the plot.

You can read out while the logger is recording data, or after the logger
has been stopped. Refer to the HOBOware User’s Guide for details about
reading out, saving, and displaying data.

Verifying Logger Operation

It is a good idea to quickly test the logger before each deployment,
especially if the logger has been stored unused for a long period. To test
the logger, take the following steps:

1. Set up the logger (attach sensors, etc.) and start HOBOware.

2. Access the Launch window and verify that HOBOware detects

all of the connected modules and sensors.

3. Enter a logging interval of a few seconds so that your test will

yield enough data to look at, and select the logger’s internal
battery channel. Make sure the logger is configured to start
logging immediately upon launch.

Important: If you are using both channels of a TRMS module,
you must select a minimum 2-second logging interval. If all
TRMS modules are configured for single-channel use, you can
use a 1-second logging interval.

4. If you are using sensor excitation, configure it for each

FlexSmart Analog module channel. Sensors purchased from
Onset include sensor connection instructions, including warmup
time (if required). For sensors not supplied by Onset, consult the
sensor manufacturer’s datasheet for warm up time requirements.

• Many sensors specifications assume that the sensor will be

powered continuously, but may be capable of switched
operation to conserve battery life. You may need to experiment
to determine the best warm up time for rated transducer
accuracy.

• The Energy Logger disables excitation when the battery pack

voltage falls to approximately 6.8V (0.85 volts per cell). The

Section 2: Setup and Test

16 HOBO Energy Logger User’s Guide

batteries are essentially dead at this point and should be
changed. The logger will continue to log, but data for channels
using excitation will be invalid.

5. Click Launch to start the logger.

6. After a couple of minutes, read out the logger. (Answer Yes

when prompted to stop the logger.)

7. Make sure the data appears normal for all sensors.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 3: Modules and Sensors

HOBO Energy Logger User’s Guide 17

Section 3: Modules and Sensors

This section provides details on working with modules and sensors.

Adding and Removing Modules and Sensors

Whenever possible, it is best to add and remove modules and sensors
between deployments – after stopping the logger and reading out data,
but before relaunching. However, circumstances may require that you
add or remove a module or sensor at some other time.

If you add a module or sensor while the logger is recording data, the
module or sensor will be ignored. Logging will continue normally for the
other channels.

You may attach modules and sensors at the following times:

• Any time between deployments, when the logger is stopped.

• While you are configuring the launch parameters in HOBOware.

Click Refresh to update the Logging Duration and see the new
module or sensor added to the list of sensors.

• After you have launched the logger, but before logging has

begun (i.e. when the logger is waiting for a delayed or button
start). Note that adding modules or sensors will cause the
logging duration to be shorter than the duration that was
displayed in the Launch window.

If you remove a module or sensor while the logger is logging, the
Sensor Fail indicator will blink when the next logging interval is
reached, and the logger will record erroneous data for that channel. This
is true even if you immediately connect another sensor of the same type
in the same port. If you want to change sensors – even sensors of the
same type – you must stop the logger, read it out, swap the sensors, and
then relaunch.

Smart Sensor Cables

The logger can work with a maximum total of Smart Sensor cable
lengths up to 100 meters (328 feet), as measured from the logger
connection point to the electronics embedded in the individual cables.
Optional Smart Sensor extension cable lengths must also be included in
the total.

Section 3: Modules and Sensors

18 HOBO Energy Logger User’s Guide

This limitation applies to Smart Sensor cables only. The lengths of other
cables, such as those connected to FlexSmart modules, do not need to be
included in this total.

Analog (CVIA) Module

The Analog module (S-FS-CVIA) is an easy-to-configure, flexible DC
signal-conditioning module for the HOBO Energy Logger. This two­channel module can accept (and provide excitation power to) a wide
range of Onset and third-party sensors with 0-0 V or 0-20 mA output,
including devices with 4-20 mA current loop interface, and sensors with
0-2.5, 0-5, and 0-10 V DC output.

The Analog module features input protection and signal filtering, as well
as delta-sigma A/D conversion and factory calibration. This module
features extremely low-power operation, resulting in long battery life for
unattended data logging applications. Precision electronics provide
±0.25% accuracy from 50 mV to full scale (FS).

Sensors connected to this Analog module can be configured in
HOBOware software. Configuration options include channel names,
scaling parameters, and excitation power. Sensors are connected to the
module via a seven-pin Phoenix-style detachable screw terminal
connector.

Functional Block Diagram

Figure 3: Analog Module - Functional Block Diagram

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 3: Modules and Sensors

HOBO Energy Logger User’s Guide 19

Connecting Sensors to the Analog Module

Insert the Phoenix-style screw terminal connector into the connector on
the end of the module.

Note: The Analog module is a single-ended device. Pins 3 and 7 are
connected to signal ground and to each other.

Refer to the sensor documentation for terminal connection details and
use the pinout diagram below to connect a two- or three-wire sensor or
transducer to the module’s terminals. To make the connection, loosen the
screw for each pin on the connector, insert the appropriate wire, and
tighten the screw.

The following example illustrates typical connections for a voltage
sensor, and a current sensor that requires excitation:

1

2

3

4

5

6

7

4 - 20 mA

Transducer

Excitation

IN

Pin #

1

2

3

4

5

6

7

Function

Shield

Channel 1 Input

Channel 1 Return

Excitation Voltage

Excitation Return

Channel 2 Input

Channel 2 Return

Signal

OUT

0 - 5 Volt

Transducer

Signal

OUT

Signal

GRND

Figure 4: Voltage Sensor Connections

Tip: Always refer to your sensor documentation for terminal connection

details.

Section 3: Modules and Sensors

20 HOBO Energy Logger User’s Guide

Once the sensors are connected, install the Analog module into any of
the three module slots on the logger.

Use the provided label to identify a module/sensor combination to aid in
determining sensor placement and cable routing when in the field.

Configuring Channels on the Analog Module

Each channel of the Analog module is individually configurable to
accept a wide range of sensors. That means that each channel can be
configured to measure either current or voltage, and the collected data
can be scaled to produce meaningful results that are consistent with the
properties being measured.

Use HOBOware to configure each channel at launch time, or create and
save different configurations to be loaded into the modules whenever
needed. A channel configuration consists of a channel name, measured
property name, scaling parameters, and excitation information, if
applicable. Refer to the HOBOware User’s Guide for details.

Verifying Operation

When logging begins, the logger will acquire and store measurements
from the sensors attached to the module. When the module is functioning
correctly, the Active indicator on the module blinks once per logging
interval for each configured channel to indicate that a successful
measurement has been made.

Sensor Excitation

Sensor excitation is a voltage output provided by the logger to power a
sensor that is connected to it. This power may be needed because the
sensor is not self-powered, or because the sensor’s power capacity
cannot support a long deployment.

When sensor excitation is required, the logger can provide 12 V DC
sensor excitation voltage up to 200 mA total for transducers that require
external power for proper operation. The excitation voltage has a
programmable warm up time and is controlled by the FlexSmart Analog
module. Excitation is controlled on a per-module basis.

Excitation power can drastically reduce logger battery life. If your sensor
does not require it, you should not include it in the channel configuration.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 3: Modules and Sensors

HOBO Energy Logger User’s Guide 21

If you do need to use it, carefully select the sensor excitation mode that
best meets your needs. Two modes are available:

• Warm up mode – The logger supplies excitation power for a

brief, user-programmable period prior to each measurement.
This mode allows you to select the minimum warm up time
needed to allow for sensor stabilization, while conserving the
logger’s battery power. For example, if you specify a warm up
time of one second and set the Logging Interval in the logger to
one minute, the logger will power the external sensor for one
second, log a measurement, and then turn off the excitation
power for the next 59 seconds. The warm up time can be up to
120 seconds.

Note: If the warm up time selected is greater than the logging
interval selected, the logger will interpret the excitation mode as
continuous.

• Continuous mode – The logger supplies constant excitation

power to the sensor for the entire duration of the deployment.
This mode will result in the shortest battery life. Continuous
mode is required if the sensor needs more than two minutes of
warm up time. If you need to provide continuous excitation to a
sensor, you should consider backing up your batteries with an
external power source. Refer to External Power Sources on page
28 for details.

Important: When using excitation power, always enable the logger’s
internal battery channel at launch. If the battery becomes too low to
provide excitation power, excitation power is turned off, but logging
continues as long as the battery can power the logger. This will cause the
further readings on that channel to become inaccurate. If you are logging
the internal battery channel when this happens, an “Excitation Off” event
will be shown in your datafile to mark the point at which excitation
power was disabled. (If you do not log the internal battery channel, you
will not have anything in your datafile to identify the point beyond which
the data might be inaccurate.)

Section 3: Modules and Sensors

22 HOBO Energy Logger User’s Guide

Working with Channels

The Energy Logger can log up to 15 data channels (not including the
internal battery channel). This includes all FlexSmart module channels,
plus each of the Smart Sensor channels (note that some Smart Sensors
may have more than one channel). If you have more than 15 channels
connected, some of the sensors will be ignored. You should remove any
Smart Sensors that will not be used in the deployment, and disable any
module channels that are not needed.

• FlexSmart modules have two channels. If you want to log only

one channel, you can disable the unused channel on the Launch
window in HOBOware. Refer to the HOBOware User’s Guide
for details.

• If you connect a Smart Sensor that has multiple channels (such

as temperature and relative humidity), all of its channels will be
logged. There is no way to disable them.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 4: Batteries and External Power

HOBO Energy Logger User’s Guide 23

Section 4: Batteries and External

Power

The HOBO Energy Logger requires eight 1.5V AA batteries. The logger
is shipped with eight alkaline batteries, and is also compatible with
enhanced alkaline batteries and lithium batteries (Li/FeS

2

).

An external power source can reduce or eliminate the need for internal
batteries in applications that have readily available AC power, or require
more current and/or longer deployments than the logger's internal
batteries can support. See External Power Sources on page 28.

Selecting batteries

Onset recommends alkaline batteries for most applications because they
are inexpensive, can provide more accurate battery status readings in
HOBOware, and last longer than similar lithium batteries at moderate
temperatures.

However, some applications or environments are better suited to other
types of batteries. Refer to the following table to determine which type of
battery you should use.

Battery type Considerations for use

Alkaline These are best for most applications at moderate

temperatures.

Alkaline batteries also work in temperatures ranging
from 40° to 50°C (104° to 122°F) and from -20° to
0°C (-4° to 32°F), but may not perform as well as
lithium batteries at these temperatures.

At temperatures lower than -20°C (-4° F) and higher
than 50°C (122°F), alkaline batteries are not suitable.
Use lithium batteries instead.

Enhanced
alkaline (such as
Energizer

®

E2 or

Duracell

®

Ultra)

Consider these for applications with higher sensor
excitation requirements and moderate temperatures.
These batteries are specifically designed for high­current use. For low-current applications, however,
they offer little improvement.

Section 4: Batteries and External Power

24 HOBO Energy Logger User’s Guide

Battery type Considerations for use

Lithium
(Li/FeS

2

)

Lithium batteries last longer than alkaline batteries in
applications with extreme or varying temperatures
(below 0°C/32°F or above 40°C/104°F). They also
outperform alkalines in deployments with high sensor
excitation currents (>100 mA) or long warmup times.

Lithium battery voltage does not vary much until the
batteries are nearly depleted. Because of the
uncertainty in capacity, you may wish to start each
deployment with fresh lithium batteries that you
know are at 100%, rather than rely on old ones.

Important: Do not use any other type of battery, such as carbon zinc
(“heavy duty”) or rechargeable batteries. These batteries will not perform
well and will not report their battery status accurately in HOBOware.

WARNING: Fire, Explosion, and Severe Burn Hazard. Do
not mix battery types, either by chemistry or age; batteries
may rupture or explode. When replacing the batteries, read
and follow their disposal instructions; dispose of lithium
batteries according to local regulations. Do not dispose of
batteries in fire. Never attempt to recharge a lithium or
alkaline battery. Do not heat the batteries above 185°F (85°C).
Do not mutilate or rupture the battery housing. Lithium
batteries may explode if the logger is exposed to extreme heat
or conditions that could damage or destroy the battery case.
Do not expose the contents of the battery to water.

Battery Life

Battery life will vary with the following factors:

• Sensor excitation current and warm up time (most important

factor)

• Logging interval (and sampling interval, if applicable) selected

• Number of sensors being used

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 4: Batteries and External Power

HOBO Energy Logger User’s Guide 25

• Battery type

• Operating environment (e.g., temperature)

The following graph can help you estimate how long batteries will last
(the run time) at different logging intervals and excitation currents with a
warm up time of 30 seconds.

Logging Interval

0.1

1.0

10.0

100.0

1000.0

1 21 41 61 81 101 121 141 161 181

Excitation Current (mA)

Battery Life (days)

1 Min 5 Min 10 Min 1 Hr

Figure 5: Battery Life

Note: This graph assumes that standard alkaline batteries and three
FlexSmart modules are being used.

This graph was generated from a spreadsheet that can estimate battery
life for varying parameters. Contact Onset Technical Support for more
information.

Maximizing Battery Life

• Batteries are inexpensive compared to the cost of a new logger

or a missed logging opportunity. If you suspect that batteries are
damaged or run down, replace them immediately to prevent
leakage or logger malfunction.

• When launching the logger in HOBOware, do not set a

Sampling Interval unless you have sensors that support
measurement averaging. Only the following Smart Sensors and
input adapters support measurement averaging:

Section 4: Batteries and External Power

26 HOBO Energy Logger User’s Guide

- 12-bit Temperature S-TMB-M0XX

- 12-bit 4-20 mA Input Adapter (S-CIA-CM14)

- 12-bit Voltage Input Adapter (S-VIA-CM14)

- Photosynthetically Active Radiation (PAR) S-LIA-M003

- Silicon Pyranometer (Solar Radiation) S-LIB-M003

Note: Although some Smart Sensors are intended mainly for
outdoor use (for example, the PAR and Solar Radiation sensors),
the Energy Logger is suitable for indoor use only.

• If you are using excitation voltage, select the shortest warm up

time needed for the sensor.

• Verify that the batteries’ “Use Before” date is at least two years

from the current date.

• Alkaline batteries will lose up to 10% of capacity per year if they

are sitting on a hot shelf. They can lose 50% or more of their
capacity if exposed to heat repeatedly (for example, stored on a
car dashboard). Keeping batteries in the refrigerator can reduce
self-discharge to 1 to 2% per year, but you must prevent
condensation from forming on the batteries.

• Use new batteries if you expect the deployment to require a

substantial portion of battery life.

Replacing Batteries

Fresh batteries are cheap insurance for extended deployments or high­draw applications when using an external power source is not feasible.

• Before replacing batteries, always read out the logger to prevent

data loss.

• Replace batteries at least once a year to prevent loss of data.

• Replace batteries more often if you are using sensor excitation.

To replace batteries:

1. Select the type of batteries you will use and obtain eight fresh,

new batteries of the same type. For more information on

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 4: Batteries and External Power

HOBO Energy Logger User’s Guide 27

selecting the type of batteries to use for your application, refer to
Selecting batteries on page 23.

2. Using a Phillips head screwdriver, loosen the screw on the back

of the battery compartment door. Remove the door.

Figure 6: Replacing Batteries

3. Remove the used batteries and dispose of them properly.

4. Install eight new 1.5 V AA batteries, using care to match the

polarity marked in the battery compartment. Do not mix battery
types.

5. Position the battery compartment door in place and tighten the

screw to secure it. Do not over-tighten the screw.

Recovering Data from a Logger with Dead Batteries

The logger uses very durable, high-capacity Flash memory. With this
memory, data is retained even when the batteries are dead or removed.

If the logger stops recording data because the batteries are dead, you can
recover the data that has been recorded. Simply replace the batteries and
then read out the data from the logger as usual.

Important: Do not relaunch the logger until the data has been recovered.
If, after changing the batteries, you are still unable to read out your

Loosen screw on battery
com

p

artment door

Insert batteries into
battery compartment

Section 4: Batteries and External Power

28 HOBO Energy Logger User’s Guide

logger, contact the vendor that sold it to you. It may be possible to
retrieve the logged data.

External Power Sources

An external power source can reduce or eliminate the need for internal
batteries in applications that have readily available AC power, or require
more current and/or longer deployments than the logger's internal
batteries can support. The logger can operate on a DC input voltage from
several external sources including:

• Standard 12 V automotive/motorcycle type battery

• Sealed lead-acid (SLA) type 12 V battery (used in

uninterruptible power supplies and emergency lighting systems)

• External alkaline/lithium battery packs

• Optional AC power adapter (Onset part # P-AC-1)

There are two ways you can use an external power source:

• Battery eliminator mode - In place of the internal batteries. In

this mode, the logger can operate on a DC input voltage ranging
8 V – 15 V.

• Battery backup mode - To conserve the internal batteries as an

automatic back-up supply if the external supply should fail,
similar to an uninterruptible power supply. To do this, you must
provide a DC input voltage greater than that of the internal
batteries. Thus, a DC input voltage of 13.6 V – 15 V is required
for proper operation.

External Power Adapter Specifications

• Able to deliver 750mA

• Positive outer sleeve

• 2.1 mm center pin diameter

• 5.5 mm outer sleeve diameter

• 10 mm outer sleeve length

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 5: Maintenance

HOBO Energy Logger User’s Guide 29

Section 5: Maintenance

This section describes general maintenance activities for the HOBO
Energy Logger.

General Maintenance Schedule

Regular maintenance of the logger is essential to ensure the accuracy of
recorded measurements. The logger is primarily intended for indoor use.
It can be damaged by many environmental conditions, such as moisture,
airborne contaminants, vibration, and tampering. Performing regular
maintenance checks allow you to:

• Verify that the logger is logging data and functioning as you

expect

• Identify damage

• Minimize the impact of any existing damage

The following table lists maintenance activities and how often they
should be performed:

Activity Frequency

Inspect logger housing and
cables

Each use.

Verify sensor accuracy Refer to the sensor manufacturer’s manual

for information on how often to verify
sensor accuracy.

Clean the logger As needed.

Replace the batteries At least once a year, or before any

deployment that requires many sensors,
excitation, etc. or is scheduled for an
extended deployment.

Verify logger operation Before each deployment.

Section 5: Maintenance

30 HOBO Energy Logger User’s Guide

Inspecting the Logger Housing and Cables

Periodically perform a visual inspection of the logger. Verify that the
logger housing is free of visible damage, such as cracks, and that it is
clean.

Also ensure that cables and wires are free of damage, such as cracks,
cuts, and splits; are fastened securely, free of corrosion and in good
condition.

Verifying Sensor Accuracy

Onset recommends that you test most Smart Sensor accuracies once a
year. For details on verifying sensor accuracy, refer to the documentation
included with each sensor. For third-party sensors (even those supplied
by Onset), refer to documentation provided by manufacturer.

For a fee, Onset can verify the accuracy of any sensor. It may be possible
to recalibrate some sensors. Contact Onset Technical Support for details.

Cleaning the Logger

The logger does not require specialized cleaning; however, if it is
deployed in a dusty or grimy location, you should wipe it down with a
damp cloth occasionally. This will prevent dirt from interfering with
sensors.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 6: Reference

HOBO Energy Logger User’s Guide 31

Section 6: Reference

Time Accuracy

When you launch a logger, its clock is set by the host computer’s time
and time zone offset from UTC. (UTC, or Coordinated Universal Time,
is similar to Greenwich Mean Time.) The time zone offset makes it
possible to determine objective, non-local time. This prevents conflicts
and confusion when you relaunch a logger with a shuttle that may have
been launched in a different time zone, or before a Spring or Fall time
change.

Once the logger is logging, it will keep fairly accurate time. However,
the following may cause errors with time reporting.

• Host clock error. The most likely source of error is an incorrect

time, or time zone setting, on the computer that launched the
logger. Make sure the clock on your computer is set to the
correct date and time before launching the logger. One accurate
resource is http://www.nist.time.gov.

• Launch time loss. The logger may lose up to two seconds when

it is launched. This is a one-time error that occurs as part of the
start-up sequence and cannot be avoided.

• Clock drift. The logger’s long-term time accuracy is related to

ambient temperature. At 25°C (77°F), the worst-case error is ±8
parts per million (PPM), or about 5 seconds per week. The error
increases as the temperature deviates from 25°C, as shown in the
graph below. At a constant temperature of -20°C, the logger time
error could be as much as 35 PPM (21 seconds per week).

Section 6: Reference

32 HOBO Energy Logger User’s Guide

The following graph shows the worst-case time
error.

Figure 7: Worst-case Time Error

Resetting the Logger’s Clock

Reading out the logger and relaunching it will reset the logger’s clock.
This is useful when your logger has been running for a while and its
clock needs to be reset. Make sure the computer clock is set accurately
before relaunching.

1. Exit HOBOware.

2. Correct the computer’s clock.

3. Restart HOBOware.

4. Read out the logger, if you have not done so already.

5. Relaunch the logger.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 6: Reference

HOBO Energy Logger User’s Guide 33

Memory

The logger contains 512K bytes of very durable, high-capacity, non­volatile Flash memory, which stores data even if power runs out. This
allows for data retention even when the batteries become depleted or are
removed.

Up to 10K of this memory is used to store the launch configuration and
deployment notes, leaving at least 502K bytes for data storage.
HOBOware automatically estimates how long the logger will record data
before the memory fills up, based on the logging interval and the number
and type of sensors connected. This is called the logging duration.

Adding sensors or logging the internal battery channel decreases the
logging duration; increasing the logging interval increases the logging
duration.

For most applications, it is battery life and not memory capacity that
limits the logging duration. The following table shows the expected run
time for several logging intervals based on the total number of bits in
place, which is determined by adding together the bits per sample for
each sensor measurement parameter in your system. For example, a
HOBO Energy Logger with the following sensors is using 56 total bits.

Sensor

Bits per

Sample

Total bits

1 temperature sensor X 8 = 8

1 wind speed sensor X 16 = 16

2 temperature sensors X 16 = 32

Total number of bits 56

At a logging interval of 5 minutes, the logging duration for a logger
using 56 bits would be approximately 250 days. (Refer to the sensor
manual to determine the number of bits each type of sensor uses.)

Section 7: Diagnostics and Troubleshooting

34 HOBO Energy Logger User’s Guide

Section 7: Diagnostics and

Troubleshooting

This section lists some symptoms and tips to help you confirm correct
operation of your logger, and help you diagnose possible problems. It
discusses the following diagnostic and troubleshooting topics:

• Indicator LED behavior

• Testing the logger

• Problems and solutions

Indicator LED behavior

The indicator LEDs can provide helpful clues as to what the logger is
doing, especially when it is not behaving as expected.

Note: The indicators are very faint under direct sunlight or bright
fluorescent lighting. If no indicators appear to be blinking, shield the
logger from the light and check the indicators again.

Push to Start (Green)

If you have launched the logger with the Trigger start option, this
indicator will continue blinking and will not record any measurements
until you press and hold the Push to Start button on the logger for at
least two seconds. You can add and remove Smart Sensors and
FlexSmart modules while this indicator is blinking.

Delayed Start (Green)

If you have launched the logger with an At Interval or Delayed start
option, the indicator will continue blinking and the logger will not record
measurements until the defined start date/time. You can add and remove
Smart Sensors and FlexSmart modules while this indicator is blinking.

Logging (Green)

This indicator blinks every two seconds while the logger is recording
data from sensors. Sensors must not be added while this indicator is
blinking.

If this indicator is not blinking when you believe it should, make sure the
logger has been launched. If you configured the logger to launch with a

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 7: Diagnostics and Troubleshooting

HOBO Energy Logger User’s Guide 35

delayed or interval start, check the date and time you selected and make
sure the Delayed Start indicator is blinking. If you configured the logger
to launch with the Trigger start option, press and hold the Push to Start
button on the logger until all the indicators flash at once (at least two
seconds).

Memory Low (Red)

If the logger was launched with wrapping disabled, this indicator blinks
when less than 25% of memory remains for saving data. The logger will
continue to run until all memory is used.

If the logger was launched with wrapping enabled, this indicator should
not blink.

Battery Low (Red)

This indicator blinks when battery power is at less than 25% capacity, or
if the batteries are installed improperly. The logger will continue logging
until the batteries are dead; however, you should read out the data and
replace the batteries as soon as possible, before the batteries die, and then
relaunch the logger. Or, attach an external power source if possible.

If this indicator continues to blink even after you have replaced the
batteries:

• Check that the batteries are installed properly. If the polarity of

any of the batteries is incorrect, this indicator will blink.

• Make sure you are using the correct battery type. The logger uses

eight 1.5 volt AA alkaline or lithium batteries. The battery type
must be specified correctly on the Launch Logger dialog for the
correct battery status to be reported.

• Make sure all batteries are of the same type - either all alkaline,

all enhanced alkaline, or all lithium. Never mix battery types.

• Check the battery expiration date. Verify that the expiration date

is at least two years from the current date. Batteries can lose
significant capacity if stored at elevated temperatures.

• Check the voltage of the batteries with a voltmeter. Alkaline

batteries should be at least 1.5 V per cell when new; fresh
lithium batteries should be 1.6 V per cell.

Section 7: Diagnostics and Troubleshooting

36 HOBO Energy Logger User’s Guide

Sensor Fail (Red)

This indicator blinks when there is or has been a FlexSmart module or
Smart Sensor communication failure.

Note: If the Sensor Fail indicator is blinking, you should read out the
logger, investigate the problem, and then relaunch the logger.

• If the Sensor Fail indicator is blinking in conjunction with the

Logging indicator, there was a communication failure, but the

system has recovered. There may be an intermittent problem.
Try checking the FlexSmart modules and Smart Sensors one at a
time to make sure they are all communicating. If you find a bad
module or sensor, or if no module or sensor communicates,
contact your Onset Authorized Dealer or Onset Technical
Support.

• If the Sensor Fail indicator is the only one that is blinking, at

least one FlexSmart module or Smart Sensor is currently not
communicating. You should investigate this problem
immediately. Look for a loose connection, which could cause
bad electrical contact with a module or sensor. If found, remove
the offending module or sensor and check its wires and
connector for damage and/or signs of moisture.

Problems and Solutions

Problem Solution

N

o status
indicators are
blinking

The indicators are very faint under direct sunlight or
bright fluorescent lighting. If no indicators appear to
be blinking, shield the logger from the light and
check the indicators again.

Check the status in HOBOware:

• Make sure the batteries are not dead.

Batteries should have at least 1 volt per cell.

• The memory may be full. Read out the

logger and relaunch.

• The logger may not have been launched.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 7: Diagnostics and Troubleshooting

HOBO Energy Logger User’s Guide 37

Problem Solution

Individual
modules or
sensors are not
found, or are
missing in
HOBOware’s
Launch Logger
dialog

If a FlexSmart module or Smart Sensor is removed
and then immediately reconnected, it may not be
detected, and therefore will not appear on the
Launch Logger dialog. Click the Refresh button on
the Launch Logger dialog.

Check for a loose connection between the module or
sensor and the logger.

Make sure you have not exceeded 100 meters (328
ft) of network cable for all Smart Sensors.

N

o modules or
sensors appear in
HOBOware’s
Launch Logger
dialog

Remove all modules and sensors except one, click
Refresh, and see if the module or sensor appears on
the Launch Logger dialog. Continue to remove and
reconnect modules and sensors one at a time until
you identify the culprit. If you find the bad module
or sensor, or if none of the modules or sensors
communicates, contact your Onset Authorized
Dealer or Onset Technical Support.

Batteries die

p

rematurely

Check for excessive moisture or contamination in
the logger enclosure. Severe and/or repeated
condensation in the logger enclosure can lead to
short circuits and battery failure. It may be
necessary to place the logger in an additional
weatherproof case with desiccant inside the
enclosure to prevent condensation.

Make sure that both the logging and sampling
intervals are set for at least one minute or greater.
Fast sampling and logging intervals (shorter than
one minute) will rapidly deplete the battery. For
more information, refer to “Maximizing battery life”
on p. 25.

Check for damaged wiring and malfunctioning
modules and sensors. Damaged cables or connectors
can result in complete or partial short circuits that
will rapidly drain batteries.

Section 7: Diagnostics and Troubleshooting

38 HOBO Energy Logger User’s Guide

Problem Solution

Datafile contains
errors

If you are missing data for a particular module or
sensor, check that it was properly installed and
configured. Remove and reconnect the module or
sensor, and check the status in HOBOware to verify
that it can report accurate readings. If you find that it
is not communicating, it may be damaged. Contact
your Onset Authorized Dealer or Onset Technical
Support.

Excitation power
stops working

The batteries have dwindled to 6.8 V while
excitation was in use. The batteries are nearly dead
and must be changed.

Datafile cannot be
opened

In rare circumstances, the datafile may have become
corrupted. Read out the logger again and try opening
the file again. If that does not work, contact your
Onset Authorized Dealer or Onset Technical
Support.

Logger is not
found

Check and replace the batteries, and reconnect the
logger.

Check communication cable connections.

Review the Communication preferences in
HOBOware.

Check the computer’s COM port/USB settings.

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]

Section 7: Diagnostics and Troubleshooting

HOBO Energy Logger User’s Guide 39

Index

Analog module, 4, 7, 12, 15,

18–20, 20

Batteries, 3, 4, 13, 14, 23–26

dead, 16, 27, 33, 37
indicator, 35
installing, 10
replacing, 26

Battery channel, 10, 13, 15, 21,

22, 33

Delayed/interval start, 3, 13, 17,

34, 35

Excitation, 2, 4, 12, 13, 15, 18,

19, 20–21, 23, 24, 38

External power source, 3, 4, 7,

8, 10, 21, 28, 35

FlexSmart modules, 2, 12, 13,

22

analog, 4, 7, 12, 15, 18–20, 20
TRMS, 2, 4, 8, 15

Indicators (LEDs), 2, 14, 17, 20,

34–36, 36

Logging interval, 2, 15, 17, 20,

21, 24, 33, 37

Measurement averaging. See

Sampling interval

Memory, 2, 14, 27, 33, 36

wrapping, 13, 14, 35

Power adapter, power supply.

see External power source

Sampling interval, 3, 13, 24, 25,

37

Sensor excitation. See

Excitation

Sensors, 2, 36, 37

adding and removing, 17
FlexSmart, 4, 10, 12, 13, 19,

22, 34

Smart, 1, 4, 5, 10, 13, 17, 22,

25, 26, 30, 34

Smart Sensors, 1, 2, 4, 5, 10, 13,

22, 25, 26, 30, 34

cable lengths, 37
cable lengths, 17

Trigger (button) start, 3, 6, 13,

14, 17, 34, 35

TRMS module, 2, 4, 8, 15

Warmup, 2, 15, 21, 24, 26

Wrap, 2, 13, 14, 35

40 HOBO Energy Logger User’s Guide

www.GlobalTestSupply.com

Find Quality Products Online at: [e-mail]