General EMF1394DL User manual
DIGITAL TRIPLE AXIS
EMF METER WITH
DATA LOGGING
MICRO SD CARD
USER’S MANUAL
EMF1394DL
Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
What’s In the Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –5
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 –6
Install Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 –6
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 – 12
easuring Real-time E F Intensity . . . . . . . . . . . . . . . 6 –8
Displaying aximum and inimum Triaxial Readings . . . 8
Storing and Recalling Readings anually . . . . . . . . . . 8 –9
Automatic Data Logging . . . . . . . . . . . . . . . . . . . . . . . 9 – 12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating & aintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . 14
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 – 15
Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INTRODUCTION
Thank you for purchasing eneral Tools & Instruments’ EMF1394DL Digital
Triple Axis EMF Meter with Data Logging MicroSD Card. Please read this
user’s manual carefully and thoroughly before using the product.
The EMF1394DL is ideal for measuring the intensity of electromagnetic and
magnetic fields produced by power lines, industrial machinery, and home
appliances (computer and TV monitors). Although some studies suggest a link
between long-term exposure to electromagnetic fields—especially extremely
low-frequency (ELF) fields—and cancer or childhood leukemia, there are
currently no standards defining recommended or permissible exposure levels.
However, until evidence disproves the health risk of EMF/ELF exposure,
common sense suggests minimizing exposure on a daily basis.
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KEY FEATURES
• Uses three orthogonal sensors to measure field intensity independent
of angle
• Displays readings in microTeslas (μT) or milli auss (m )
• Internal memory for manual storage of up to 99 three-axis readings
• Included 4 B MicroSD card for automatic logging of thousands of
readings
• Triple readout 3-1/2 digit LCD
• Autoranging or manual ranging
• Min/Max memory + data hold
• 15-minute Auto Power Off (can be disabled for data logging)
• Flip-up stand
• CE and RoHS approved
• 1-year limited warranty
WHAT’S IN THE PACKAGE
The EMF1394DL comes in a box along with Windows-compatible data logging
software on CD, a pre-installed 4 B MicroSD card, a cable with a full-size
USB plug at one end and a mini-USB plug at the other, six “AAA” batteries and
this user’s manual.
PRODUCT OVERVIEW
The figure on the next page shows the locations of the meter’s front-panel
controls and indicators, two jacks on top, and battery compartment and
MicroSD card on the back. Familiarize yourself with the locations and
functions of these components before moving on to the Setup Instructions
and Operating Instructions.
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Triple readout LCD. In normal display mode, upper readout shows total
(triaxial) EMF intensity and lower readouts show current day and hour and
current minute and second. In alternate display mode, upper readout
shows field intensity on x axis and lower readouts show field intensity on y
and z axes.
(Power) button. Press and hold for at least 3 seconds to power meter
on and off.
button. “Freezes” displayed EMF reading(s). Also used to disable Auto
Power Off (APO) function.
X/ N button. Used to show highest (maximum) and lowest (minimum)
value of triaxial EMF intensity measured since meter was last powered on.
G/T button. Toggles between microTeslas (μT) and milli auss (m ) units of
EMF intensity.
Range button. Used to exit Autoranging mode and select one of three
available manual ranges.
SET button. Toggles between normal and alternate display modes. Also
used to set data logging sampling time as well as currrent day and time.
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BACK OF UNIT
E button. Used to: a) Manually store displayed reading(s) in meter’s
internal memory at indicated location number; b) Begin automatic logging
of three-axis EMF readings onto MicroSD card at selected sampling time,
and c) Erase contents of meter’s internal memory and contents of
MicroSD card.
READ button. Recalls manually stored EMF readings in chronological or
reverse chronological order.
Arrow (, and ) buttons and (enter) button. Arrow buttons
used to: a) Navigate memory locations; b) Change sampling time and day
and time values; and c) Move left and right between day and time fields.
Enter button used to: a) Save settings; b) Enter day and time setting
mode; and c) Exit automatic data logging and internal memory read
modes.
ini-USB jack. For exporting data logs stored on MicroSD card to PC.
Jack for optional AC adaptor 4GB icroSD card (under batteries)
Battery compartment Hinges of flip-up stand
SETUP INSTRUCTIONS
INSTALL BATTERIES
1. Turn the meter over and lift the flip-up stand. Carefully
squeeze its arms toward each other just below the stand’s
hinges (Callout 15 of figure on the previous page) until the
pin at the end of each arm comes out of its mounting hole
on the housing. Remove the stand and set it aside.
2. Use a coin (a dime or a penny) or a flat-head screwdriver
to loosen the single screw securing the battery
compartment cover (Callout 14). Remove the screw and
cover and set them aside. Take care not to lose the screw.
3. Before you install the batteries, carefully lift the top half of
the paper strip with battery markings exposed by the
removal of the battery compartment cover (see top right
photo).
Note the MicroSD card pre-installed in a metal bracket
underneath (see right photo).
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4. Return the top half of the paper strip to its original, flat position.
5. Insert the six included “AAA” batteries into the compartment, using the
battery markings on the paper strip as a guide.
6. Replace the battery compartment cover and secure it by reinserting the
screw and tightening it with a coin or screwdriver.
7. Carefully re-install the flip-up stand by squeezing the top of its arms
together and re-inserting the pins at the top of each arm into the mounting
holes.
Complete Setup by carefully removing the plastic film protecting the LCD.
OPERATING INSTRUCTIONS
MEASURING REAL-TIME EMF INTENSITY
To power on the EMF1394DL, press and hold the green button (Callout 2)
for at least 3 seconds. The unit will sound a long beep and the LCD will
illuminate. The LCD will briefly show, in the following sequence:
1) All display indications
2) The term EEP on the upper readout and 1on the lower right readout
3) Auto on the upper readout and OFF on the lower right readout (to
indicate that the meter’s Auto Power Off (APO) function is enabled)
4) The term SdHC on the upper readout and 2.0 on the lower left readout
The meter will then power on with a clock icon in the lower left corner of the
LCD to further confirm that the APO function is enabled. Next, the meter will
automatically enter “normal” display mode. In this mode, the upper readout
shows total (triaxial) EMF intensity (indicated by the text X Y Z at the upper
left of the LCD) and the two lower readouts show the current day and hour
and current minute and second.
To set the current day and time, follow the procedure on pages 10 and 11. If
you never intend to automatically log EMF measurements, you need not enter
day, hour, minutes and seconds values (which together serve as a time
stamp).
To enter alternate display mode, press the SET button (Callout 7). In this
mode, the LCD shows the x-axis field intensity on the upper readout (with an
Xat the upper left of the reading) and the field’s y- and z-axis intensities on
the lower readouts (with a Yand a Zbelow the readings).
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To make a measurement:
1. Hold the meter in your hand far from the power line, machine or
appliance whose EMF intensity you wish to measure. Note that the
meter’s upper readout may show a value other than zero, due to random
EMF generation in the local environment.
2. Move slowly towards the target. Note how the intensity increases as you
move closer, and peaks as you physically touch the target.
3. When measuring the EMF produced by a machine or appliance, power off
the device and take a new reading of residual environmental EMF.
Subtract the peak reading from the residual reading to determine the
actual EMF intensity produced by the machine or appliance.
Experiment using alternate display mode to measure the axial EMF intensities
produced by a device. A label on the back of the meter indicates how to orient
it to measure and display the X, Y and Z components of a three-dimensional
EMF.
To change the measurement unit of EMF intensity, press the G/T button
(Callout 5). The button toggles between microTeslas (μT) and milli auss (m )
units. μTor m G appears at the right of the value displayed on the upper
readout.
The EMF1394DL automatically enters Autoranging mode when powered on.
To switch to one of the three available manual ranges, press the Range
button (Callout 6). Pressing the button causes the symbol R to appear in the
upper left corner of the LCD.
• Pressing the Range button once enters the narrowest measurement
range—0 to 20 m (0 to 2μT). In this range, both kind of readings (the
combined triaxial reading and the separate x-, y- and z-axis readings)
have 0.01 m (0.001 μT) resolution.
• Pressing the button again enters a middle measurement range—0 to 200
m (0 to 20μT). In this range, readings have 0.1 m (0.01 μT) resolution.
• Pressing the Range button a third time enters the widest measurement
range—0 to 2000 m (0 to 200μT). In this range, readings have 1 m
(0.1 μT) resolution.
To exit anual ranging mode and re-enter Autoranging mode, press and
hold the Range button for at least 3 seconds. This will cause the Rsymbol to
disappear from the upper left corner of the LCD.
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To hold a reading or readings (the combined triaxial EMF intensity reading
on the upper readout or the separate axial readings on the three readouts),
press the button (Callout 3). To release the reading(s), press the
button again.
To power off the EMF1394DL, press and hold the button for at least
3 seconds.
DISPLAYING MAXIMUM AND MINIMUM TRIAXIAL READINGS
The EMF1394DL automatically keeps track of the maximum and minimum
(largest and smallest) EMF values recorded over a measurement “session”—
the time during which the meter is used to measure the EMF intensity at
multiple distances from a device and/or the intensity of multiple devices. The
session begins when you power on the EMF1394DL; it typically ends 15
minutes after you finish making measurements with the activation of the
meter’s APO function.
The value of being able to quickly determine the largest and smallest EMF
generator of a group of machines or appliances, or the locations where the
EMF intensity of a particular device are higher (highest) and lower (lowest),
should be obvious.
To display the maximum triaxial E F value recorded by the EMF1394DL
since it was last powered off, switch the meter to operate in normal display
mode and press the X/ N button (Callout 4). The term AX will appear on
the top line of the LCD.
To display the minimum triaxial E F value recorded over the same
period, press the X/ N button again. The term IN will replace AX on
the top line.
The EMF1394DL cannot display Max and Min values of single-axis
measurements.
To exit ax/ in mode and re-enter normal, real-time EMF measurement
mode, press and hold the X/ N button for at least 3 seconds.
STORING AND RECALLING READINGS MANUALLY
The EMF1394DL incorporates enough fixed, internal memory to store up to
99 three-axis EMF readings. To store a displayed reading, briefly press (but do
not hold) the E button (Callout 8). The upper readout will briefly flash a
number from 1 to 99 indicating the number of the memory location where the
currently displayed reading will be stored. When you release the button the
meter will return to displaying triaxial or single-axis EMF intensity readings.
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To recall one or more stored readings, begin by pressing the READ button
(Callout 9). A small R will appear at the lower left of the LCD to indicate that
the meter is now operating in memory read mode.
To correlate displayed readings with their memory location number,
begin by pressing the or button several times. With each press, the
upper readout will briefly show a new memory location number, followed by
the display on the three readouts of the individual x-, y- and z-axis values of
EMF intensity stored at that location. To view the next-oldest reading, press
the button. The displayed memory location number will decrease by one,
and the three readouts will then show the individual axial values recorded at
that location. To view the next-newest reading, press the button.
Note that although you may have been viewing a combined triaxial reading
when you stored it, upon recall the three readouts show the individual axial
components of that reading. In other words, in memory read mode the meter
defaults to operating in alternate display mode. In addition, while the meter is
operating in memory read mode you can combine individual axial readings
into a triaxial reading by pressing the SET button, in effect returning to normal
display mode.
To exit memory read mode and resume operation in the display mode last
used (normal or alternate), press the button (Callout 10). Doing so will
cause the small Rat the left of the lower readouts to disappear.
To clear the meter’s internal memory:
1) Press and hold the button for 3 seconds to power off the meter.
2) Press and hold the E button while pressing the button once. After
a brief display of the term EEP on the upper readout and 1on the lower
right readout, the three readouts will together spell out the term rEC CLr
NO.
3) Press the button to change NO to yES on the lower right readout.
4) Press the button to execute the yES command—that is, delete the
entire contents of the meter’s internal memory.
AUTOMATIC DATA LOGGING
In addition to manually storing up to 99 readings, the EMF1394DL can
automatically log thousands of triaxial EMF intensity readings on its pre-
installed 4 B MicroSD card.
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Before beginning to data log, you should:
1) Disable the meter’s APO function so the meter will not shut itself down
after 15 minutes of front-panel inactivity. To disable APO: a) Power off the
meter; b) Power it back on in a special way by pressing and holding the
button while pressing and holding the button for at least 3 seconds.
You should release the and buttons precisely when SdHC 2.0
appears on the LCD. If you release the button too soon, Auto OFF will
appear before SdHC 2.0. The meter will power on, but the APO function will
not be disabled. If you release the button too late, the meter will fail to
power on. Unlike the display that follows a normal power on sequence
detailed on page 6, if you have successfully disabled the APO function you
will not see the clock icon that normally appears in the lower left corner of
the LCD to indicate that the APO function is enabled.
2) Set the data logging sampling time. To set the sampling time, press and
hold the SET button for at least 3 seconds. A number from 1 to 255 will
appear, flashing, on the upper readout and the term INTV (for interval) will
appear at the bottom right of the LCD. The number represents the data
logging sampling time, in seconds. Use the
and buttons to set the sampling time to any value from 1 to 255
seconds and then press the button to save your selection. The meter will
resume operating in normal display mode.
Choosing a sampling time requires making a tradeoff. Choose a small
number if you want to capture many EMF values over a short period of
time. The downside of using a short sampling time (such as 1 second) is
that you will fill up the MicroSD card with data within a few hours. By
comparison, choosing a long sampling time (such as
60 seconds) avoids filling up the MicroSD card’s capacity prematurely, but
at the risk of missing key changes in EMF intensity that may occur within
the samples, one-minute apart. As a compromise, consider an intermediate
sampling time value on the order of 15 seconds.
3) Set the current day, hour, minute and second to serve as a time stamp
for your data logs. To set the day and clock, press and hold the SET button
for at least 3 seconds, as you did to set the sampling time. When the
currently selected sampling time begins flashing, press the ►button. The
upper readout will go blank and the number above day in the lower left
readout will begin flashing. Use the and buttons to change the value
to that of the current day, and then press the button to save your
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