Hoyt 2940 CL User manual

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INSTRUCTION MANUAL
AC CLAMP METER
2940 CL

Index
1. Introduction..............................................
2. Safety notes..............................................
3. Features......................................................
4. Specications...........................................
5. Instrument layout...................................
6. Measurement...........................................
7. Maintenance...........................................
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Warning
Read "Safety Notes"(next page) before using the meter.
1. Introduction
Note
This meter has been designed and tested according to
CE Safety Requirements for Electronic Measuring
Apparatus, EN 61010-1 EN 61010-2-32 and other safety
standards. Follow all warnings to ensure safe operation.
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2. Safety Notes
Read the following safety information carefully before
attempting to operate or service the meter.
● Use the meter only as specified in this manual, otherwise
the protection provided by the meter may be impaired.
● Always keep hands behind the meter barrier.
● Use extreme caution when clamping around uninstalled
conductors or bus bars.
● Never clamp around any conductor carrying a voltage
above 600V R.M.S.
● During current measurement to avoid an electric shock
accident, do not connect the test leads to the instrument.
● To avoid electric shock when measuring live lines, wear
appropriate protective gear, such as insulated rubber gloves
and boots.
● Rated environmental conditions:
(1) Indoor use.
(2) Installation Category II 600V
Category III 300V
(3) Pollution Degree 2.
(4) Altitude up to 2000 Meter.
(5) Relative Humidity 80% Max.
(6) Ambient Temperature 0~40.
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▬
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3. Features
● 4000-count LCD.
● Full automatic measurement.
AC Current measurement.
AC/DC Voltage measurement.
Resistor measurement.
● Data Hold function.
● Continuity check.
● Diode measurement.
● Low battery indication.
● Auto-off function.
● Flashlight.
● Safety Standard :
EN 61010-1 CAT II 600V / CAT III 300V
EN 61010-2-32
EN 61326-1
● Observe the international electrical symbols listed below.
Meter is protected throughout by double insulation
or reinforced insulation.
Warning ! Risk of electric shock.
Caution ! Refer to this manual before using the meter.
Alternating current.
Direct current.
Earth (ground).
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±(1.5%rdg+5dgt)
(40~500Hz)
AC Voltage
Range Resolution Accuracy
4.000V 1mV ±(1.5%rdg+10mV)
(40~500Hz)
40.00V 10mV
400.0V 100mV
750V 1V
● Input impedance : 10MΩ
4. Specifications
AC Current
Range Resolution Accuracy
400.0A 0.1A ±(2.0%rdg+5dgt)
1000A 1A (40~200Hz)
DC Voltage
Range Resolution Accuracy
4.000V 1mV
40.00V 10mV
400.0V 100mV
1000V 1V
● Input impedance : 10MΩ
±(1.0%rdg+5dgt)
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Resistance
Range Resolution Accuracy
400.0Ω 0.1Ω
4.000kΩ 1Ω
40.00kΩ 10Ω
400.0kΩ 100Ω
4.000MΩ 1kΩ
40.00MΩ 10kΩ ±(2.0%rdg+4dgt)
Threshold level (beep sound) : less than 25Ω
±(1.5%rdg+3dgt)
● Overload protection: ACV 750V rms
DCV 1000V
Diode & Ohm 250V rms
● Conductor size: 35mm
● Low battery indication: " " sign appears on the display.
● Response time: Approx. 1 second.
● Sample rate: Approx. 2 times per second
● Temperature and humidity:
Operating: 0°C~40°C / 80% R.H. Max.
Storage: -10°C~50°C / 80% R.H. Max.
● Battery life : Approx. 100 hours on continuity use.
● Dimension : 183(L) × 62(W) × 20(D)mm
● Weight : Approx 123g (battery included)
● Power source : DC 3V (CR2032) battery × 1
● Accessories : Instruction manual
Test leads
Soft pouch
Battery
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5. Instrument layout
(1) Transformer Jaws (6) Function Switch
(2) Flashlight (7) Input Terminal
(3) Jaw Trigger (8) SELECT Push Button
(4) LCD (9) Flashlight Button
(5) Data Hold Button (10) Barrier
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(1)
(2)
(3)(3)
(4)
(5)
(6)
(7)
(9)
(8)
(10)
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(1) Transformer Jaws
Pick up the conductor within the jaws center.
(2) Flashlight
For easier viewing in the dark.
(3) Jaw Trigger
Press to open the jaws.
(4) LCD
3¾ digit LCD with maximum reading of 3999.
(5) Data Hold Button
Freeze the reading for all ranges with "HOLD" indicated.
(6) Function Switch
For function selection
(7) Input Terminal
"+" and "-" terminal
(8) SELECT Push Button
For select function : a. ACV / DCV
(9) Flashlight Button
For flashlight function
(10) Barrier
Provide a protective distance from hands to conductor.
b. Ω / /
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6. Measurement
Before proceeding with measurement, read the safety notes.
(1) AC current measurement
● Set the function switch to " A" range.
● Press the jaw trigger to open the transformer
jaws and clamp onto one conductor only.
● Read the display reading directly.
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(2) ACV measurement
● Insert the BLACK test lead to (-)terminal and the
RED one to the other terminal.
● Set the function switch to " ▬… V" range and press
the SELECT button, until the " AC " symbol appears.
● Connect the test leads to the object to be measured.
● Read the display.
(3) DCV measurement
● Insert the BLACK test lead to (-)terminal and the
RED one to the other terminal.
● Set the function switch to " ▬… V" range
● Connect the test leads to the object to be measured.
● Read the display.
Note: Reversing the polarity of the test leads
displays a negative value.
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(4) Resistance measurement
● Insert the BLACK lead to the (-)terminal and the
RED one to another.
● Set the function switch to "Ω / / " range
and make sure there is no power in the circuit
being Measured.
● Connect the test leads to the object under test
and read the display directly.
(5) Continuity test
● Insert the BLACK lead to the (-)terminal and the
RED one to another.
● Set the function switch to "Ω / / " range and
press the "SELECT" button, until the " "
symbol appears.
● Connect the test leads to the object under test.
● The buzzer will work when the resistance is less
than 25Ω.
(6) Diode test
● Turn the function switch to "Ω / / " setting
and press the "SELECT" button twice, until the
" " symbol appears.
● Connect the 2940 CL red and black test lead,
red test lead should connect Diode (+Anode)
black test lead should connect Diode (-Cathode).
The display will show the reading.
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WARNING
To avoid electrical shock or damage to the meter,
do not get water inside the case.
7. Maintenance
(1) Battery Replacement:
When low battery warning appears, change a new
battery as follows:
Disconnect the test leads from the instrument and
turn off the power. Unscrew the battery cover and
replace with a new battery.
(2) Cleaning and storage:
Periodically wipe the case with a damp cloth and
detergent. Do not use abrasives or solvents.
If the meter is not to be used for a long time over
60 days, please remove the battery for storage
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