AEMC SDL-A301 User manual

CURRENT
DATA LOGGERS
SENTINEL
CURRENT
DATA LOGGERS
ENGLISH User Manual
®

Statement of Compliance
Chauvin Arnoux®, Inc. d.b.a. AEMC®Instruments
certifies that this instrument has been calibrated
using standards and instruments traceable to
international standards.
We guarantee that at the time of shipping your
instrument has met its published specifications.
An NIST traceable certificate may be
requested at the time of purchase, or obtained
by returning the instrument to our repair and
calibration facility, for a nominal charge.
The recommended calibration interval for this
instrument is 12 months and begins on the date of
receipt by the customer. For recalibration, please
use our calibration services. Refer to our repair
and calibration section at www.aemc.com.
Serial #: ______________________________
Catalog #: ______________________________
Model #: ______________________________
Please fill in the appropriate date as indicated:
Date Received: _________________________________
Date Calibration Due: _______________________
Chauvin Arnoux®, Inc.
d.b.a AEMC®Instruments
www.aemc.com

READ CAREFULLY BEFORE USING
NOTE: The Sentinel Loggers that are equipped with rechargeable
NiMH batteries are designed to be used with the power adapter
plugged in. When not plugged in or during a power failure, the bat-
teries will work up to 10 hours. It is recommended that you keep
the logger plugged in to avoid battery drainage.
If the battery becomes fully drained and the logger will not function,
recharge the battery using an external battery charger.
Your instrument is equipped with a NiMH battery (model dependent). This
technology offers several advantages:
Long battery charge life for a limited volume and weight.•
Possibility of quickly recharging your battery.•
Signicantlyreducedmemoryeffect:youcanrechargeyour•
battery even if it is not fully discharged.
Respect for the environment: no pollutant materials such as lead•
or cadmium, in compliance with the applicable regulations.
After prolonged storage, the battery may be completely discharged.
If so, it must be completely recharged with an external battery
charger (available at local retail stores).
Your instrument may not function during part of this recharging
operation.
Full recharging of a completely discharged battery may take several
days.
Do not dispose of the battery pack with other solid waste. Used
batteriesmustbeentrustedtoaqualiedrecyclingcompanyortoa
company specialized in processing hazardous materials.

Table of Contents
INTRODUCTION ..................................................................................... 4
1.1 International Electrical Symbols................................................4
1.2 Denition of Measurement Categories .....................................5
1.3 Receiving Your Shipment..........................................................5
1.4 Ordering Information.................................................................5
1.5 Accessories and Replacement Parts........................................6
1.5.1 Sensors Compatible with Model SDL-A401..................7
1.5.2 Current Probes Compatible with Model SDL-A402 ......7
PRODUCT FEATURES............................................................................. 9
2.1 Description................................................................................9
2.2 Control Features .....................................................................10
SPECIFICATIONS................................................................................. 12
3.1 Electrical .................................................................................12
3.2 Mechanical..............................................................................13
3.3 Environmental.........................................................................13
3.4 Safety......................................................................................13
OPERATION......................................................................................... 14
4.1 Operating Modes ....................................................................14
4.2 Connecting the Sentinel®to a Computer ................................16
4.3 Turning the Unit On.................................................................16
4.4 Recording Data.......................................................................17
4.4.1 Starting a Recording Session .....................................17
4.4.2 Stopping a Recording Session ...................................18
4.5 Downloading Recorded Data..................................................18
4.6 Erasing Data from Memory.....................................................18
4.7 Data Storage...........................................................................19
4.7.1 Trend Measurements..................................................19
4.8 Normal Operation ...................................................................19
4.8.1 Normal Operating Environment ..................................19
4.9 Reset Button Operation ..........................................................22
4.10 Synopsis of Operation ............................................................23

MAINTENANCE ................................................................................... 26
5.1 Changing the Alkaline Batteries..............................................26
5.2 Recharging the Batteries ........................................................26
5.3 Replacing the Rechargeable Batteries ...................................27
TROUBLESHOOTING ............................................................................ 28
GLOSSARY.......................................................................................... 29
Repair and Calibration...........................................................................31
Technical and Sales Assistance ............................................................31
Limited Warranty ...................................................................................32
Warranty Repairs...................................................................................32

4 Sentinel®Current Data Loggers
CHAPTER 1
INTRODUCTION
WARNING
These safety warnings are provided to ensure the safety of personnel
and proper operation of the instrument.
• Read the instruction manual completely and follow all the safety infor-
mation before attempting to use or service this instrument.
• Never exceed the maximum working voltage ratings given.
• NEVER open the back of the instrument while connected to any circuit
or input.
• Always inspect the instrument accessories and leads prior to use.
Replace any defective parts immediately with factory parts.
1.1 International Electrical Symbols
This symbol signifies that the instrument is protected by double or reinforced
insulation.
This symbol on the instrument indicates a WARNING and that the operator must refer
to the user manual for instructions before operating the instrument. In this manual,
the symbol preceding instructions indicates that if the instructions are not followed,
bodily injury, installation/sample and product damage may result.
Risk of electric shock. The voltage at the parts marked with this symbol may be
dangerous.
This symbol refers to a type A current sensor. This symbol signifies that application
around and removal from HAZARDOUS LIVE conductors is permitted.
This symbol refers to a type B current sensor. Do not apply around or remove from
HAZARDOUS LIVE conductors without additional protective means (de-energizing
the circuit or wearing protective clothing suitable for high voltage work).
In conformity with WEEE 2002/96/EC

Sentinel®Current Data Loggers 5
1.2 Definition of Measurement Categories
Cat. IV: For measurements performed at the primary electrical supply
(<1000V) such as on primary overcurrent protection devices,
ripple control units, or meters.
Cat.II: For measurements performed on circuits directly connected to
the electrical distribution system. Examples are measurements
on household appliances or portable tools.
Cat.III: For measurements performed in the building installation at
the distribution level such as on hardwired equipment in xed
installation and circuit breakers.
1.3 Receiving Your Shipment
Upon receiving your shipment, make sure that the contents are consistent with
the packing list. Notify your distributor of any missing items. If the equipment
appears to be damaged, le a claim immediately with the carrier and notify your
distributor at once, giving a detailed description of any damage. Save the dam-
aged packing container to substantiate your claim.
1.4 Ordering Information
UNITS
Sentinel®AC Logger Model SDL-A301 .......................... Cat. #2134.15
(3-Channel, 1000AAC)
Includes three attached 24" AmpFlex®sensors, USB cable, DataView®CD-ROM, 4x1.5V
C-cell alkaline batteries installed, user manual and warranty card.
Sentinel®AC Logger Model SDL-A302 .......................... Cat. #2134.16
(3-Channel, 3000AAC)
Includes three attached 24" AmpFlex®sensors, USB cable, DataView®CD-ROM, 4x1.5V
C-cell alkaline batteries installed, user manual and warranty card.
Sentinel®AC Logger Model SDL-A303 .......................... Cat. #2134.17
(3-Channel, 1000AAC)
Includes three attached 24" AmpFlex®sensors, USB cable, (120V US) wall plug adapter with
9VDC output, DataView®CD-ROM, 4x1.5V AA rechargeable NiMH batteries installed, user
manual and warranty card.

6 Sentinel®Current Data Loggers
Sentinel®AC Logger Model SDL-A304 .......................... Cat. #2134.18
(3-Channel, 3000AAC)
Includes three attached 24" AmpFlex®sensors, USB cable, (120V US) wall plug adapter with
9VDC output, DataView®CD-ROM, 4x1.5V AA rechargeable NiMH batteries installed, user
manual and warranty card.
Sentinel®DC Logger Model SDL-A401 ........................... Cat. #2134.19
(4-Channel - Four AmpFlex®Sensors w/ BNC Output [not included])
Includes USB cable, (120V US) wall plug adapter with 9VDC output, DataView®CD-ROM,
4x1.5V AA rechargeable NiMH batteries installed, user manual and warranty card.
Sentinel®AC/DC Logger Model SDL-A402 .................... Cat. #2134.20
(4-Channel - Four 1V Current Probes with BNC Output [not included])
Includes USB cable, (120V US) wall plug adapter with 9VDC output, DataView®CD-ROM,
4x1.5V AA rechargeable NiMH batteries installed, user manual and warranty card.
KITS
Sentinel®AC Logger Model SDL-A401 Kit..................... Cat. #2134.21
Includes the Model SDL-A401, three 1000A 24" AmpFlex®sensors with BNC output, USB
cable, (120V US) wall plug adapter with 9VDC output, DataView®CD-ROM, 4x1.5V AA
rechargeable NiMH batteries installed, carrying bag, user manual and warranty card.
Sentinel®AC Logger Model SDL-A401 Kit..................... Cat. #2134.22
Includes the Model SDL-A401, four 1000A 24" AmpFlex®sensors with BNC output, USB
cable, (120V US) wall plug adapter with 9VDC output, DataView®CD-ROM, 4x1.5V AA
rechargeable NiMH batteries installed, carrying bag, user manual and warranty card.
Sentinel®AC Logger Model SDL-A401 Kit..................... Cat. #2134.23
Includes the Model SDL-A401, three 3000A 36" AmpFlex®sensors with BNC output, USB
cable, (120V US) wall plug adapter with 9VDC output, DataView®CD-ROM, 4x1.5V AA
rechargeable NiMH batteries installed, carrying bag, user manual and warranty card.
Sentinel®AC Logger Model SDL-A401 Kit..................... Cat. #2134.24
Includes the Model SDL-A401, four 3000A 36" AmpFlex®sensors with BNC output, USB
cable, (120V US) wall plug adapter with 9VDC output, DataView®CD-ROM, 4x1.5V AA
rechargeable NiMH batteries installed, carrying bag, user manual and warranty card.
1.5 Accessories and Replacement Parts
Set of color-coded leads (red/black) with alligator clips....... Cat. #2118.51
Banana (Female) - BNC (Male) Adapter (XM-BB)............... Cat. #2118.46
Large classic tool bag.......................................................... Cat. #2133.71
110/220V Power Adapter for use with
Sentinel Models A303, A304, A401 and A402 .....................Cat. #2134.41

Sentinel®Current Data Loggers 7
1.5.1 Sensors Compatible with Model SDL-A401
AmpFlex®SDL-1000A - 24" with BNC output...................... Cat. #2129.00
AmpFlex®SDL-1000A - 36" with BNC output...................... Cat. #2129.01
AmpFlex®SDL-3000A - 24" with BNC output...................... Cat. #2129.02
AmpFlex®SDL-3000A - 36" with BNC output...................... Cat. #2129.03
1.5.2 Current Probes Compatible with Model SDL-A402
NOTE: All current probes except Models MN261, SL261, SR661, MR461 and
MR561 will require a Banana (Female) to BNC (Male) adapter [Cat. #2118.46]
AC Current Probe Model MN103
(Lead - 1mV/mA - 10A max & 1 mV/A - 100A max)............................. Cat. #1031.02
AC Current Probe Model MN114
(Lead - 100mV/A - 10A max) ........................................................ Cat. #2110.71
AC Current Probe Model MN251
(Lead - 1mV/A - 240A max).......................................................... Cat. #2115.77
AC Current Probe Model MN261
(BNC - 100mV/A - 24A; 10mV/A 240A max) ..................................... Cat. #2115.82
AC Current Probe Model MN307
(Lead - 100mV/AAC - 12A max) ..................................................... Cat. #2116.23
AC Current Probe Model MN375
(Lead - 100mV/A - 10A max) ........................................................ Cat. #2115.41
AC/DC Current Probe Model SL201
(Lead - 1mV/mA - 2A max & 1mV/A - 150A max) ............................... Cat. #1201.40
AC/DC Current Probe Model SL206
(Lead - 1mV/mA - 2A max & 10mV/A - 80A max) ............................... Cat. #1201.45
AC/DC Current Probe Model SL261
(BNC - 100mV/mA - 10A peak & 10mV/A - 100A peak) ....................... Cat. #1201.51
AC Current Probe Model MD301
(Lead - 1mVDC/AAC - 500A max) ................................................... Cat. #1201.07
AC Current Probe Model MD314
(Lead - 1mV/A - 500A max).......................................................... Cat. #2110.75

8 Sentinel®Current Data Loggers
AC Current Probe Model SR652
(Lead - 1mV/A - 1000A max) ........................................................ Cat. #2113.46
AC Current Probe Model SR661
(BNC - 100mV/A-10A; 10mV/A-100A; 1mV/A-1000A max) ................... Cat. #2113.49
AC Current Probe Model SR752
(Lead - 1mV/A - 1000A max) ........................................................ Cat. #2116.32
AC Current Probe Model SR759
(Lead - 1/10/100/1000A/1V)......................................................... Cat. #2116.33
AC/DC Current Probe Model MR461
(BNC - 10mV/mA - 60A peak & 1mV/A - 600A peak)........................... Cat. #1200.72
AC/DC Current Probe Model MR561
(BNC - 10mV/mA - 150A peak & 1mV/A - 1500A peak) ....................... Cat. #1200.73
NOTE: The current probe measurement ranges are limited to 1Vrms.
Above 1.1Vrms, the meter will show overload.
Order Accessories and Replacement Parts Directly Online
Check our Storefront at www.aemc.com/store for availability

Sentinel®Current Data Loggers 9
CHAPTER 2
PRODUCT FEATURES
2.1 Description
The Sentinel®Current Data Loggers are three- and four-channel current
recording devices with alkaline or rechargeable battery packs (model
dependent). Line tracking is performed such that 64 samples over one
line cycle are taken. Frequency tracking is performed over the range of
±3Hz around the nominal line frequency (50 or 60Hz). Measurements are
calculated from these 64 samples for all input channels.
The Sentinel®records RMS values for each of the inputs at a rate of up to
four times per second. Measurements for each channel are taken sequen-
tially. RMS calculations from the 64 samples are performed on each single
line cycle measured for each input. DC measurements are also on all volt-
age models and probe dependent on current models.
The main advantage of the Sentinel®logger is its ability to perform a vari-
ety of recording tasks with easy and intuitive setup from a computer using
the DataView®software, which is included.
Analog information on the input is sampled and converted to a digital signal.
This digital signal is processed and stored along with scale and time infor-
mation. An optically isolated Universal Serial Bus (USB) port facilitates the
transfer of data from internal memory to the computer for analysis.
Three LEDs on the front panel (red, yellow and green) indicate recording
and memory status at a glance. User selectable storage rate, recording
length and recording modes are provided.
An optically isolated Universal Serial Bus (USB) port provides the trans-
fer of data from internal memory to the computer for analysis. Figure 2-1
shows a block diagram of the logger.
Figure 2-1. Data Logger Block Diagram

10 Sentinel®Current Data Loggers
2.2 Control Features
2
1
3
4
5
DCIN 9V
SENTINEL
®
DATA LOGGER
TRMS CURRENT LOGGER MODEL SDL-A301
600V CAT III 1000A
I2I1 I3
Figure 2-2. Key Components and Features
1. Hard-wired current inputs or BNC inputs for iron core current
probes (3- or 4-channel and model dependent)
2. Control Button (Record Start/Stop)
This button marked “PRESS” selects the mode of operation. The
logger has three modes: RECORD, STANDBY and OFF. Use this
button to start or stop recordings and erase the memory.
3. Three LED Indicators
•REDLED:Indicates the status of battery voltage
•YELLOWLED:Indicates the status of the memory
LED OFF: No data in memory
LED Single Blink: Memory is partially lled
LED Double Blink: Memory is full
•GREENLED: Indicates the mode of operation
LED OFF: Logger is turned off
LED Single Blink: Logger is in Standby Mode (and not recording)
LED Double Blink: Logger is in Record Mode
Note: All LEDs single blink simultaneously in case of an overload (≥10%
above range) at the input if the unit is in power-on status.

Sentinel®Current Data Loggers 11
4. USB Communication Port
5. Power Input (Model dependent)
6. Reset Button (not shown)
This button resets the CPU.
The RESET Button is located inside the instrument under the shield.
Remove the rear cover and insert a small tool, such as a pen, through
the hole in the shield to activate it. Do not press the RESET Button
under normal operation.
WARNING: If the RESET Button is pressed when the logger is recording, it will
stop recording and data in the memory may be lost.

12 Sentinel®Current Data Loggers
CHAPTER 3
SPECIFICATIONS
3.1 Electrical
Reference Conditions: 23°C ± 5°C (30 to 50% RH) range. Add 300 ppm/°C from -10° to 18°C and 28° to
50°C to all accuracy specications. Conductor must be centered in the sensor. Continuous magnetic eld
<40 A/m (Earth Magnetic Field). No external electrical or alternating magnetic eld is present. Sinusoidal
current with frequency 50/60Hz ± 3Hz for >60A and 50/60Hz for <60A. Calibration cycle is 1 year.
MODEL SDL-A301 SDL-A302
Channels Three Three
Input Hard-wired AmpFlex®Flexible Current Sensors
Current Range 5 to 1000A 15 to 3000A
Resolution 0.1A 0.25A
Accuracy 5 to 100A:
± (1.0% of Reading + 1.2A)
100 to 1000A:
± (1.0% of Reading + 1.0A)
15 to 100A:
± (1.0% of Reading + 1.5A)
100 to 3000A:
± (1.0% of Reading + 1.0A)
Sample Rate 64 samples/cycle
Storage Rate Programmable from 250ms to 12 hrs
Storage Technique Stop when full, FIFO and Extended Recording Mode* (XRM™)
Recording Length 1 minute to 8 weeks, programmable using DataView®
Memory 480,000 measurement (1MB)
Communication USB 2.0 optically isolated
Power Source** 4x1.5V C-cell alkaline batteries
Battery Life 100 hours to 45 days (dependent on sample rate)
MODEL SDL-A303 SDL-A304
Channels Three Three
Input Hard-wired AmpFlex®Flexible Current Sensors
Current Range 5 to 1000A 15 to 3000A
Resolution 0.1A 0.25A
Accuracy 5 to 100A:
± (1.0% of Reading + 1.2A)
100 to 1000A:
± (1.0% of Reading + 1.0A)
15 to 100A:
± (1.0% of Reading + 1.5A)
100 to 3000A:
± (1.0% of Reading + 1.0A)
Sample Rate 64 samples/cycle
Storage Period Programmable from 250ms to 12 hrs
Storage Technique Stop when full, FIFO and Extended Recording Mode* (XRM™)
Recording Length 1 minute to 8 weeks, programmable using DataView®
Memory 480,000 measurement (1MB)
Communication USB 2.0 optically isolated
Power Source** AC power/rechargeable 4x1.5V NiMH battery pack
Battery Life Power ride through 10 hrs

Sentinel®Current Data Loggers 13
MODEL SDL-A401 SDL-A402
Channels Four Four
Input BNC
Sensor/Probe
Type
24" or 36” AmpFlex®
Flexible Current Sensors
0-1V output probes w/BNC
(use only specified current probes)
Current Range 5 to 1000A 15 to 3000A Probe dependent
Resolution 0.1A 0.25A Probe dependent
Accuracy 5 to 100A
± (1.0% of Reading +1.2A)
100 to 1000A
± (1.0% of Reading +1.0A)
15 to 100A
± (1.0% of Reading +1.5A)
100 to 3000A
± (1.0% of Reading +1.0A)
Probe dependent
Sample Rate 64 samples/cycle
Storage Rate Programmable from 0.25s to 12 hrs
Storage
Technique
Stop when full, FIFO and
Extended Recording Mode* (XRM™)
Recording Length 1 minute to 8 weeks, programmable using DataView®
Memory 480,000 measurement (1MB)
Communication USB 2.0 optically isolated
Power Source** AC power/rechargeable 4x1.5V NiMH battery pack
Battery Life Power ride through 10 hrs
*This unique recording mode provides the opportunity to continuously record over long periods of time
by reducing the stored sample resolution of the oldest data and maintaining matching resolution for the
newest data. Each time the memory lls up using XRM™, every other of the oldest stored samples is dis-
carded making room for newer samples. This process continues until the recording is manually stopped.
**An internal lithium battery (>2.8V) provides additional memory back up for up to 30 days. If the unit is
connected to DataView®via a PC, the operating time is 100 hours regardless of the storage rate.
3.2 Mechanical
Dimensions:6.73 x 4.76 x 2.17" (171 x 121 x 55mm)
Weight-ModelsA301-A302-A303-A304:3 lbs (1.4kg) with batteries and probes
Weight-ModelA401:3.3 lbs (1.5kg) with batteries and probes
Weight-ModelA402:1.1 lbs (0.5kg) with batteries, excluding probes
Case: Polycarbonate UL94-V2
Vibration: IEC 68-2-6 (1.5mm 10 to 55Hz)
Shock:IEC 68-2-27 (30G)
Drop:IEC 68-2-32 (1m)
3.3 Environmental
OperatingTemperature:14° to 122°F (-10° to 50°C)
StorageTemperature:-4° to 140°F (-20° to 60°C)
RelativeHumidity:0 to 85% @ 95°F (35°C), Non-condensing
Altitude:2000m
3.4 Safety
Safety:600V Cat. III, 300V Cat. IV (with sensors/probes attached)
*All specications are subject to change without notice

14 Sentinel®Current Data Loggers
CHAPTER 4
OPERATION
4.1 Operating Modes
The Sentinel®Data Logger has three modes of operation: RECORD,
STANDBY and OFF.
After the instrument has been turned on, the operating mode of the logger
can be determined by pressing the PRESS button for less than 1.5 seconds.
The GREEN LED indicates the mode of operation:
LEDOFF: Logger is turned off
LEDSingleBlink:Logger is in Standby Mode (and not recording)
LEDDoubleBlink:Logger is in Record Mode
The YELLOW LED indicates the state of recording memory:
LEDOFF: No data in memory
LEDSingleBlink: Memory is partially lled
LEDDoubleBlink: Memory is full
In the STANDBY and OFF modes, the logger retains recorded information
for transfer to a computer.
Both of these modes have low power states, which require very little
power from the battery. The LEDs will not blink at this time. By using these
low power states the instrument can be programmed to start recording at
some time in the future without draining the batteries. The instrument can
also record for very long periods.
NOTE: While in a low power state, a button press is required before further
use of the instrument. For this reason, a short button press should be issued
before attempting any button control operations.
When in the STANDBY mode, the unit enters the low power state if the
button is not pressed for ve minutes. It will remain in this state until either
the button is pressed or the internal clock reaches the start time for a
scheduled recording.

Sentinel®Current Data Loggers 15
When in the RECORD mode, the instrument will enter the low power state
provided the storage period is one second or greater and the button has
not been pressed for ve minutes. If the recording storage rate is faster
than once per second the unit will not power down between sample sets.
Operations are determined by the length of time the control button is
pressed. The lighting of each LED in sequence provides a visual indication
that a required amount of time (for each operation) has been reached.
The following table illustrates the operations that can be performed while
in each of the three modes.
Mode Operation to be
Performed
Press
Duration
(seconds)
Indication
(LEDs that light) Notes
Off Turn On 5 RED, GREEN and YELLOW
simultaneously (1)
Standby
Turn Off 5 GREEN, then RED (2) (3)
Start Recording 1.5 GREEN
Erase Memory 10 GREEN, then RED,
then YELLOW (2) (4) (5)
Recording Stop Recording 3 GREEN and RED
simultaneously (1)
Notes:
(1) LEDs light at the same time.
(2) LEDs light one at a time in sequence.
(3) GREEN lights after 1.5 seconds, RED lights after 3 s.
(4) GREEN lights after 1.5 seconds, RED lights after 3 seconds and YELLOW lights after 10 s.
(5) Hold the button for 10 seconds. Release it. Press again within 3 seconds and hold for 10 s.
NOTE: If the input to the logger exceeds 10% over the measurement range
and the logger is powered on, all three LEDs will blink at a rate of one per
second.

16 Sentinel®Current Data Loggers
4.2 Connecting the Sentinel®to a Computer
INSTALL THE DATAVIEW®SOFTWARE BEFORE INSTALLING THE USB DRIV-
ERS AND BEFORE CONNECTING THE SENTINEL®TO THE COMPUTER.
Figure 4-1 shows a typical hook-up. The Sentinel®Data Logger utilizes an
optically isolated USB communication port.
The manual for the computer should indicate where to nd the USB port on
your computer.
Figure 4-1
The logger can be connected to the computer during a recording session,
however, additional battery drainage will occur to support the active USB
connection.
4.3 Turning the Unit On
The Sentinel®Data Logger can be turned ON by performing one of the
following:
• Press and hold the PRESS button for approximately 5 seconds.
• Connect the unit to a USB port on your computer and establish
communication with the instrument using the DataView®software.
The logger will remain ON while a communication link with DataView®
is active (provided sufcient battery power is available during the
communication session).
The unit has been turned ON successfully when the RED, YELLOW and
GREEN LEDs light up. At this time you can release the PRESS button.
The unit is now in the STANDBY mode.

Sentinel®Current Data Loggers 17
The instrument contains protection circuitry to prevent it from being turned
on when the battery voltage is below 3.8V.
There are two thresholds for the battery voltage depending on how the
instrument is turned ON (either button press or DataView®) and the record-
ing state that it is in.
• If the unit is turned ON from a button press, the threshold is 4.3V.
This means that if the unit is turned on and the battery voltage is below
4.3V, the RED LED will double-blink and the unit will turn off.
•If the unit is turned ON via DataView®, the threshold is 3.8V.
This means that the instrument can be turned on via DataView®as long
as the battery voltage is above 3.8V. If the instrument is recording, it will
continue to record until the battery voltage falls below 3.8V.
4.4 Recording Data
NOTE: The Sentinel®Data Logger is factory configured and may be altered
to fit the users needs (see the Configuring the Sentinel®Data Logger section
inside the DataView®user manual).
Once a conguration is written to the Sentinel®, the logger will no longer
need to be connected to DataView® to start the congured recording.
When data is stored in the memory, the user may download the informa-
tion onto a hard-disk (see the Downloading Recorded Instrument Data
section inside the DataView®user manual).
4.4.1 Starting a Recording Session
NOTE: A new recording cannot be started if the memory is full.
1. Connect the inputs to the measurement source.
2. Make sure the logger is in STANDBY mode (GREEN LED single-blinks).
3. Press the PRESS button for longer than 1.5s but less than 3s to start
recording.
4. Verify that the GREEN LED double-blinks to ensure that the logger is
recording.
WARNING: If during a recording the GREEN LED remains ON, the Sentinel®
Data Logger is in a fault condition. Disconnect immediately (the logger will
not record and the battery will drain faster).

18 Sentinel®Current Data Loggers
4.4.2 Stopping a Recording Session
1. Push the PRESS button for >3s and <5s. The RED and GREEN LED
will turn on simultaneously.
2. The GREEN LED will change from a double-blink to a single-blink,
indicating STANDBY mode.
The data will be retained, even if the instrument is turned OFF. The
recorded data may be downloaded to a hard-disk.
4.5 Downloading Recorded Data
Recorded measurements stored in the instrument are transferred to
a database on a hard-disk via the download command in the Sentinel
Control Panel. For complete instructions on downloading data, see the
Downloading Recorded Instrument Data section inside the Sentinel
DataView®user manual.
4.6 Erasing Data from Memory
Erasing data from the instrument’s memory can only be performed while
in the STANDBY mode.
WARNING: Data will be permanently lost by performing this procedure.
There are two ways to erase the memory:
ErasingtheMemoryusingthePRESSButton:
1. Press and hold the PRESS button for >10s. This will arm the instru-
ment for an erase operation (when not in record mode).
2. Once the button has been held long enough to arm the unit, the YELLOW
LED will light. At this time you can release the PRESS button.
3. Press and hold the PRESS button for another 10s within 3 seconds of
arming the erase operation.
4.
Once the button has been held long enough to erase memory, the
YELLOW LED will light. At this time you can release the PRESS
button.
5. As the memory is being erased the unit will cycle through the three
LEDs until the operation has nished.