EM306 SERIES
DIGITAL CLAMP METER
OWNERS MANUAL
Read this manual thoroughly before use
b.
c.
Inspect the test leads for damaged insulation or expo-
sed metal. Check the test leads for continuity. Replace
damaged test leads before you use the meter.
Do not use the meter if it operates abnormally.
Protection may be impaired. When in doubt, have the
meter serviced.
d.
e.
Do not operate the meter around explosive gas,
vapor, or dust.
Do not apply more than the rated voltage, as marked
on the meter, between terminals or between any
terminal and earth ground.
f.
g.
h.
Before use, verify the meter's operation by measuring
a known voltage.
When servicing the meter, use only specified
replacement parts.
Use with caution when working above 30V ac rms,
42V peak, or 60V dc. Such voltages pose a shock
hazard.
i.
j.
When using the probes, keep your fingers behind the
finger guards on the probes.
Connect the common test lead before you connect
the live test lead. When you disconnect test leads,
disconnect the live test lead first.
k. Remove the test leads from the meter before you
2
open the battery door or measure AC current.
Do not operate the meter with the battery door or
portions of the case removed or loosened.
l.
m.
To avoid false readings, which could lead to possible
electric shock or personal injury, replace the batteries
as soon as the low battery indicator ( "
appears.
" or " ")
n.
o.
p.
Before using the clamp jaws to clamp the conductor
to be measured, make sure that all the test leads
have been removed from the clamp meter.
Remove test leads from the meter and remove the
clamp jaw from the clamped conductor before opening
the meter case or the battery door.
Remaining endangerment:
When an input terminal is connected to dangerous
live potential it is to be noted that this potential at all
other terminals can occur!
q.
CATII-Measurement Category II is for measurements
performed on circuits directly connected to low
voltage installation.(Examples are measurements on
household appliances, portable tools and similar
equipments.) Do not use the meter for
measurements within Measurement Categories III
and IV.
3
Caution
To avoid possible damage to the meter or to the equi-
pment under test, follow these guidelines:
1. Disconnect circuit power and discharge all
high-voltage capacitors before testing resistance,
diode and continuity.
2. Use the proper function and range for your
measurements.
3. Before moving the rotary switch to change functions,
disconnect test leads from the circuit under test and
remove the clamp jaws from the clamped conductor.
ELECTRICAL SYMBOLS
AC (Alternating Current)
DC (Direct Current)
Important safety information. Refer to the manual.
Dangerous voltage may be present.
Earth ground
Conforms to European Union directives
Double insulated
Diode
4
GENERAL DESCRIPTION
1
This series meters are compact 3 /2-digit digital
clamp meters for measuring DC voltage, AC voltage,
AC current, resistance, diode and continuity (only
EM306B and EM306C ). They are easy to operate
and are ideal instruments.
GENERAL SPECIFICATION
1
Display: 3 /2 -digit LCD with a max. reading of 1999
Overrange indication : "1" shown on LCD
Sampling rate: Approximate 3 times per sec.
Error caused by improper position: Reading1%
(Note: The conductor should be placed in the
center of the area closed by the jaws to avoid this
error)
Sensor : Clamp-shape transformer for AC
measurement.
Jaw opening capability : 27mm
Max. measurable conductor : * 25mm
Battery : 3V, CR2032, three batteries
Low battery indication : "
" or " " on LCD
Operation temperature : 0* 40*, <75%RH
~
Storage temperature : -20* 60*, <85%RH
~
5
Size : 151mm*65mm*34mm
Weight : about 127g( including battery )
SPECIFICATIONS
Accuracy is specified for a period of one year after
calibration and at 18* 28* with relative humidity
~
up to 75%. Accuracy specifications take the form of:
*([% of Reading]+[number of Least Significant Digits]).
AC Voltage
Overload
Range
Resolution
Accuracy
protection
DC 600V
AC 600Vrms
600V
1V
*(1.2%+3)
Input impedance: 9M*
Frequency response: 40Hz~400Hz
Max. permitted input voltage: 600Vrms
6
DC Voltage
Overload
protection
Range
Resolution
Accuracy
DC 600V
AC 600Vrms
600V
1V
*(1.0%+2)
Input impedance: 9M*
Max. permitted input voltage: 600Vrms
AC Current
Overload
protection
Range
2A
Resolution
1mA
Accuracy
*(5.0%+5)
*(3.0%+5)
500A
(30 secs.)
20A
10mA
200A 100mA
400A 1A
*(2.5%+5)
Response: Average, calibrated in rms of sine wave.
Frequency range: 50 ~ 60Hz
2A range is only for EM306C.
7
Resistance
Overload
protection
Range
Resolution
Accuracy
2000*
1*
*(1.2%+2)
*(1.5%+2)
DC 250V
AC 250Vrms
200k* 100*
Audible Continuity (EM306B, EM306C)
Range
Resolution
Accuracy
When the resistance*about 30*,
1*
buzzer will sound.
Diode
Overload
Accuracy
Range Resolution
protection
Approx. forward voltage
drop will be displayed.
DC 250V
AC 250Vrms
1mV
( Opencircuit voltage
is about 3V.)
8
PANEL INTRODUCTION
1
7
6
2
3
4 5
1. Clamp Jaw
Used to clamp the conductor to be measured.
To get more accurate reading, the conductor should
be in the center of the jaws.
2. Trigger
Used to open and close the jaws for AC current
measurement.
3. Display
3 1/2-digit LCD, with a max. reading 1999.
9
4. "COM" Jack
Plug-in jack for the black (Negative) test lead.
5. "V* " Jack
Plug-in jack for the red (Positive) test lead.
6. Rotary Switch
Used to select desirable function and range as well
as to turn on /off this meter.
7. "HOLD" Button
After pressing the button, the present reading is
held on the display, meanwhile "HOLD" is displayed
on LCD as an indicator. To exit the Hold Mode,
press the button again and the indicator "HOLD" will
disappear.
10
OPERATING INSTRUCTION
Measuring DC Voltage
1. Insert the plug of the black test lead to the "COM"
jack, the plug of the red test lead to the "V*
"
jack.
2. Set the rotary switch to "
" position.
3. Connect the test leads to the source or load to be
measured.
4. Read the voltage value on the LCD. The polarity
of the red test lead connection will be indicated
as well.
Measuring AC Voltage
1. Insert the plug of the black test lead to the "COM"
jack, the plug of the red test lead to the "V*
"
jack.
2. Set the rotary switch to "
" position.
3. Connect the test leads to the source or load to be
measured.
4. Read the voltage value on the LCD.
11
Measuring AC Current
1. Set the rotary switch to the desired AC current
range position.
2. Press the trigger and clamp the conductor to be
measured with the jaws.
Make sure that the jaws are perfectly closed.
Note:
a. Each time only one conductor should be clamped.
b. The conductor should be in the center of the area
closed by the jaws in order to get an accurate
reading.
c. Don't touch the conductor with your hand or skin.
3. Read the reading on the display.
Measuring Resistance
1. Insert the plug of the black test lead to the "COM"
jack, the plug of the red test lead to the "V*
jack.
"
2. Set the rotary switch to the desired resistance
range position ("2000*" or "200k*").
3. Connect the test leads across the load to be
measured.
4. Read the reading on LCD.
12
Note:
For EM306B and EM306C, the built-in buzzer will
sound when the resistance being measured is less
than about 30*with the rotary switch in "2000*"
position.
Before you do in-circuit resistance measurement, make
sure that the power of the circuit has been disconnec-
ted and all the capacitors have been discharged.
Measuring for continuity (only EM306B
and EM306C )
1. Insert the plug of the black test lead to the "COM"
jack, the plug of the red test lead to the "V*
jack.
"
2. Set the rotary switch to the " " position.
3. Connect the test leads across the load to be
measured.
4. When the resistance being measured is less than
about 30*, the built-in buzzer will sound.
Measuring Diode
1. Insert the plug of the black test lead to the "COM"
jack, the plug of the red test lead to the "V*
"
13
jack ( the polarity of the red test lead is "+").
2. Set the rotary switch to the " " position.
3. Connect red test lead to the anode of the diode, black
test lead to the cathode of the diode.
4. Read the approximate forward voltage on LCD
( Note: Reading's unit is "mV" ).
BATTERY REPLACEMENT
When the symbol "
" or " " is shown on LCD, it
means the batteries are low and should be replaced.
To replace the batteries, remove the screw on the
battery door, replace the exhausted batteries with new
batteries of the same type(3V, CR2032, 3 batteries).
Refer to the figure, the Plus (" ") side of the batteris
must face up. Rejoin the battery door and reinstall the
screw.
clip
(You can move it for
battery replacement)
14
GENERAL MAINTENANCE
Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
Dirt or moisture in the jacks can affect readings.
Clean the jacks as follows:
1. Make sure that no object is clamped in the jaws.
2. Turn the meter off and remove all test leads.
3. Shake out any dirt that may be in the jacks.
4. Soak a new swab with alcohol. Work the swab
around in each jack.
ACCESSORIES
Manual:
1 piece
Test leads: 1 pair
DISPOSE OF THIS ARTICLE
Dear Customer,
If you at some point intend to dispose of
this article, then please keep in mind that
many of its components consist of
valuable materials, which can be recycled.
Please do not discharge it in the garbage
bin, but check with your local council for
recycling facilities in your area.
15
|