User's Guide
400Amp True RMS AC Clamp Meter
Model EX612
Introduction
Congratulations on your purchase of this Extech EX612 True RMS Clamp Meter. This meter measures
AC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Diode Test, Duty Cycle and
Continuity. Special features include Dual Input Thermocouple Temperature, and Non-Contact Voltage detector. The double molded case is designed for heavy duty use. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be present
Double insulation
WARNING
This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.
CAUTION
This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result damage to the product.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment
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SAFETY NOTES
Do not exceed the maximum allowable input range of any function.
Do not apply voltage to meter when resistance function is selected.
Set the function switch OFF when the meter is not in use.
Remove the battery if meter is to be stored for longer than 60 days.
WARNINGS
Set function switch to the appropriate position before measuring.
When measuring volts do not switch to current/resistance modes.
Do not measure current on a circuit whose voltage exceeds 600V.
When changing ranges always disconnect the test leads from the circuit under test.
CAUTIONS
Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter.
Always remove the test leads before replacing the battery or fuses.
Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair or replace any damage before use.
Use great care when making measurements if the voltages are greater than 25VAC rms or
35VDC. These voltages are considered a shock hazard.
Always discharge capacitors and remove power from the device under test before performing
Diode, Resistance or Continuity tests.
Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts. Other means should be used to ensure that the terminals are not "live".
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
This device is not a toy and must not reach children’s hands. It contains hazardous objects as well as small parts that the children could swallow. In case a child swallows any of them, please contact a physician immediately
Do not leave batteries and packing material lying around unattended; they can be dangerous for children if they use them as toys
In case the device is going to be unused for an extended period of time, remove the batteries to prevent them from training
Expired or damaged batteries can cause cauterization on contact with the skin. Always, therefore, use suitable hand gloves in such cases
See that the batteries are not short-circuited. Do not throw batteries into the fire.
A AC,
V DC, V AC
400A DC/AC
600V DC/AC
Resistance, Capacitance, Frequency, Diode Test 250V DC/AC
Type K Temperature 30V DC, 24V AC
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Description
Meter Description
2. Clamp opening trigger
4. MODE / ZERO button
5. Backlit LCD Display
6. Type K input jacks
7. Multimeter input jacks
12. Thermocouple display button
13. Battery compartment (rear)
14. Non-Contact Voltage Detector
15. NCV LED indicator
Display icons Description
AUTO Autoranging
P Peak
ZERO mV or V
DCA or CAP zero
Milli-volts or Volts (Voltage) o F and o C Fahrenheit and Celsius units (Temperature)
T
1
, T
2
, T
1
-T
2
Therocouple n, m, , M, k Unit of measure prefixes: nano, milli, micro, mega, and kilo
)
) test
Diode test
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Operation
NOTES: Read and understand all Warning and Caution statements in this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use.
Input Shutter
The Input Shutter inhibits simultaneous connection to the thermocouple jacks and the DMM input jacks. This is a safety feature which prevents a potentially hazardous condition from existing during high voltage measurements. Slide the shutter up for test lead measurements or slide it down for thermocouple temperature measurements.
Non-Contact Voltage Detector
WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live circuit to verify proper operation.
1. Rotate the Function switch to any measurement position.
2. Place the detector probe tip on the conductor to be tested.
3. If AC voltage is present, the NCV detector light will turn on with a steady red light.
NOTE: The conductors in electrical cord sets are often twisted. For best results, move the probe tip along a length of the cord to assure placing the tip in close proximity to the live conductor.
NOTE: The detector is designed with high sensitivity. Static electricity or other sources of energy may randomly trip the sensor. This is normal operation.
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AC Current Measurements
WARNING: Disconnect the test leads before making clamp measurements.
1. Rotate the Function switch to the 400A AC position
2. Press the trigger to open jaw. Fully enclose only one conductor.
3. Read the current value in the display.
4. If the value is less than 40A, rotate the function switch to the 40A AC position to improve resolution.
AC/DC Voltage Measurements
CAUTION: Do not measure voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter.
1. Slide the input shutter to the up position.
2. Rotate the function switch to the V position.
4. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
5. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
6. Read the voltage value in the display.
Frequency
When ACA is selected, the measured frequency can be viewed in the lower display.
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Resistance Measurements
Note: Remove power from the device under test before making resistance measurements
1. Slide the input shutter to the up position.
2. Set the function switch to the position.
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
4. Touch the black test probe tip to one side of the device.
Touch the red test probe tip to the other side of the device.
5. Read the resistance value in the display.
Continuity Test
1. Connect as described for resistance measurements. the
)
) ).
3. Touch the test probe tips across the circuit or component under test.
4. If the resistance is < 50 , a tone will sound.
Diode Test
1. Connect as described for resistance measurements the .
3. Touch the test probe tips to the diode or semiconductor junction under test. Note the meter reading.
4. Reverse the test lead polarity by reversing the red and black leads. Note this reading.
5. The diode or junction can be evaluated as follows:
If one reading displays a value (typically 0.400V to 01.800V) and the other reading displays OL, the diode is good.
If both readings display OL the device is open.
If both readings are very small or ‘0’, the device is shorted.
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Capacitance Measurements
WARNING: To avoid electric shock, discharge the capacitor before measuring.
1. Slide the input shutter to the up position.
2. Rotate the function switch to the capacitance position.
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive jack.
4. Touch the black test probe tip to one side of the device.
Touch the red test probe tip to the other side of the device.
5. Read the capacitance value in the display.
Note: For very large values of capacitance measurement time can be several seconds before the final reading stabilizes.
Note: The Zero feature removes stray test lead capacitance to improve the accuracy of low value capacitance measurements. To perform a zero, Press and hold the MODE ZERO button for two beeps. The display will zero. The offset value is now stored and is removed from all measurements.
.
Frequency and Duty Ratio Measurements
1. Slide the input shutter to the up position.
2. Rotate the function switch to the Hz % Position.
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Hz jack.
4. Touch the black test probe tip to one side of the device.
Touch the red test probe tip to the other side of the device.
5. Read the Frequency value on the upper large display.
Read the Duty Ratio on the lower small display. the display.
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A DC/AC Current Measurements
1. Slide the input shutter to the up position.
2. Rotate the function switch to the A position.
4. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive A jack.
5. Turn power to the circuit under test off and make a break in the circuit.
6. Insert the meter in series with the circuit;
Touch the black test probe tip to the negative side of the break.
Touch the red test probe tip to the positive side of the break.
7. Turn circuit power on.
8. Read the current value in the display.
Type K Temperature Measurements
1. Slide the input shutter to the down position.
2. Rotate the function switch to the TYPE K temperature position.
3. Press the MODE button to select °F or °C.
4. Insert the Temperature Probe(s) into the T1 and/or T2 type k sockets.
5. Place the temperature probe tip(s) where needed.
6. Read the temperature on the display.
Upper display a. T1 b. T2 c. T1-T2
Lower display
T2
T1
T1
T2
Note: In case of an open input or a temperature overrange, the meter will display “- - - -” .
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Data Hold
To freeze the LCD reading, press the HOLD button. While data hold is active, the HOLD icon appears on the LCD. Press the HOLD button again to return to normal operation.
MAX/MIN
the will appear. The meter will begins recording and displaying the maximum value measured. the measured during the recording session. reading, but will continue to update and store the max and min readings.
4. To exit MAX/MIN mode press and hold the MAX/MIN button for 2 seconds.
Peak Hold
When ACA or ACV is selected, pressing the PEAK button enables the peak capture circuit. The meter will now capture and display the maximum and minimum peaks of the waveform.
RANGE
In the Voltage, Resistance, Capacitance, Frequency or uA function the meter automatically selects the best range for the measurements being made. For measurement situations requiring that a range be manually selected, perform the following: units displayed until the preferred range is located.
3. To exit the Manual Ranging mode and return to Autoranging, press and hold the RANGE key for 2 seconds.
LCD Backlight
The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas. Press and hold the HOLD/ button for 2 seconds to turn the backlight on. The backlight will automatically turn off after 30 seconds.
Automatic Power OFF with Disable
In order to conserve battery life, the meter will automatically turn off after approximately 30 minutes.
To turn the meter on again, turn the function switch to the OFF position and then to the desired function position.
To disable APO:
1. From the OFF position, hold the MODE button and rotate the FUNCTION switch to a measurement function.
2. will appear in the display
3. Release the MODE button
4. APO is now disabled (APO icon is off) and will be reset when the Function switch is returned to the OFF position.
Low battery indication
When the icon appears in the display, the battery should be replaced. Refer to the battery replacement procedure in the maintenance section.
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Maintenance
WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for 60 days or more, remove the battery and store it separately.
Battery Replacement
1. Remove the Phillips head screw that secures the rear battery door
2. Open the battery compartment
3. Replace the 9V battery
4. Secure the battery compartment door
5.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection sites, the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-oflife devices to a designated collection point for the disposal of electrical and electronic equipment.
Other Battery Safety Reminders o Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type
Fuse Replacement
1. Remove the battery
2. Remove the Phillips head screws (2) that secures the rear cover.
3. Replace the fuse with one of equal rating. (200mA, 660V [SIBA 70-180-40])
4. Replace the rear cover and battery
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Specifications
Function Range
AC Current
50/60 Hz
True RMS
AC/DC A
Current
AC Voltage
50/60 Hz
True RMS
DC Voltage
Resistance
Capacitance
Frequency
(clamp)
Resolution
Accuracy
(% of reading + digits)
400.0 AAC 0.1A
40.00 AAC 0.01A
400.00
A 0.01A
4000.0
A 0.1A
400.0 mVAC 0.1mV
4.000 VAC
40.00 VAC
400.0 VAC
600 VAC
0.001V
0.01V
0.1V
1V
±(1.5% + 5 digits)
DC: ±(1.0% + 2 digits)
AC: ±(1.5% + 2 digits)
±(1.0% + 20 digits)
±(2.0% + 5 digits)
400.00 mVDC
4.0000 VDC
40.000 VDC
400.00 VDC
600.0 VDC
0.01mV
0.0001V
0.001V
0.01V
0.1V
±(0.1% + 6 digits)
400.00
0.01
4.0000k
0.0001k
40.000k
0.001k
400.00k
0.01k
4.0000M
0.0001M
40.000M
0.001M
400.00nF 0.01nF
4000.0nF
400.00µF
0.1nF
0.01µF
±(1.0% + 2 digits)
±(0.8% + 20 digits)
±(0.8% + 4 digits)
±(2.5% + 10 digits)
±(5.0% + 40 digits)
±(3.0% + 10 digits)
±(3.5% + 10 digits)
4000.0µF 0.1µF
±(5.0% + 10 digits)
40.000mF 0.001mF
400.00Hz
Sensitivity: 5Arms minimum
0.01Hz ±(1.0% + 3 digits)
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Function Range
Frequency
(test leads)
40.000Hz
Resolution
0.001Hz
Accuracy
(% of reading + digits)
±(0.3% + 3 digits)
400.00Hz 0.01Hz
4000.0Hz 0.1Hz
40.000kHz 0.001kHz
±(0.3% + 2 digits)
400.00kHz 0.01kHz
4000.0kHz 0.1kHz
40.000MHz 0.001MHz
Duty Cycle
Temperature
Type K
Sensitivity: 5 to 5kHz; 0.8Vrms min., 5kHz to 150kHz; 5Vrms min
0.5% to 99.0% 0.1% ±(1.2% + 2 digits)
Pulse width: 100 s to 100ms, Frequency: 5Hz to 150kHz
-58 to -4°F
-50 to -19°C
± 7°C/13°F
-4 to 31°F
-20 to -1°C
32°F
0°C
33 to 211°F
1 to 100°C
0.1° <1000°
1° >1000°
212 to 718°F
101 to 399°C
719 to 1832°F
400 to 1000°C
Specification does not include probe accuracy
±(1.0% + 1°C/2°F)
±1°C/2°F
±(1.0% + 1°C/2°F)
±(1.5% + 2°C/3°F)
±(2.5% + 4°C/7°F)
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General Specifications
Clamp jaw opening
Display
Non-Contact Voltage
Continuity check
Diode test
Low Battery indication
32mm (1.25") approx.
Dual 40,000/4,000 count backlit LCD
100 to 600VAC
Threshold 50 ; Test current < 0.5mA
Test current of 0.3mA typical;
Open circuit voltage 2.8VDC typical
Battery symbol is displayed
Measurement rate
Peak detector
Thermocouple sensor
2 readings per second, nominal
>1ms
Type K thermocouple required
Fuse
Input Impedance
AC bandwidth
200mA/660V, ceramic
10M (VDC and VAC)
50 to 400Hz (AAC and VAC)
AC response
Crest Factor
True rms (AAC and VAC)
3.0 in 40A and 400A ranges, 1.4 in 1000A range (50/60Hz and 5% to
100% of range)
Operating Temperature 5 C to 40C (41F to 104F)
Storage Temperature -20 C to 60C (-4F to 140F)
Operating Humidity
Storage Humidity
Max 80% up to 31 C (87F) decreasing linearly to 50% at 40C
(104 F)
<80%
Operating Altitude
Battery
Auto power OFF
Dimensions & Weight
Safety
2000meters (7000ft) maximum.
One (1) 9V Battery (NEDA 1604)
After approx. 30 minutes, with disable
241x96x44.5mm (9.5x3.8x1.75”); 386g (13.6 oz)
Approvals
Patent notice
For indoor use and in accordance with the requirements for double insulation to IEC1010-1 (2001): EN61010-1 (2001) Overvoltage
Category III 600V and Category II 1000V, Pollution Degree 2.
CE
U.S. Patent 7163336
Copyright © 2013‐2015 FLIR Systems, Inc.
All rights reserved including the right of reproduction in whole or in part in any form
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