User Guide
1Φ/3Φ 1000 Amp True RMS Power Clamp-On
Model 380976
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Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited warranty
applies to sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
information. A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects
resulting from action of the user such as misuse, improper wiring, operation outside of
specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific
purpose and will not be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product. The warranty set
forth above is inclusive and no other warranty, whether written or oral, is expressed or
implied.
Safety Information
•
Read the following safety information carefully before attempting to operate or
service the meter.
•
To avoid damage to the instrument do not exceed the maximum input limits shown in
the technical specifications.
•
•
Do not use the meter or test leads if they appear damaged.
Use extreme caution when working around bare conductors or bus bars. Accidental
contact with the conductor could result in electric shock.
•
Use the meter only as specified in this manual; otherwise, the protection provided by
the meter may be impaired.
•
•
Read the operating instructions before use and follow all safety information.
Use caution when working with voltages above 60VDC or 30VAC RMS. Such
voltages represent a shock hazard.
•
Before taking resistance measurements or testing continuity, disconnect the circuit
under test from the main power supply and remove all loads from the circuit.
Safety symbols
Caution! Refer to this manual before using the meter.
Dangerous voltages.
Meter is protected throughout by double insulation or
reinforced insulation.
When servicing, use only specified replacement parts.
Complies with EN-61010-1, IEC 1010-2-32
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Meter Description
1. Transformer Jaws
2. Jaw opening trigger
3. Data Hold & MX/MN button
4. Function Selector
5. Range button
6. Temperature input jack
7. LCD Display
8. ‘COM’ input jack
9. ‘V’ input jack
10.
Ω
µA input jack
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Measurements
AC + DC Voltage Measurements
WARNING
The maximum input is 600V. Do no attempt voltage measurements above this limit.
Exceeding this limit could cause electrical shock and damage to the meter.
1. Set the rotary switch to the ‘
V’ position.
2. Insert the test leads into the meter’s input jacks. (Black to
‘COM’ and Red to ‘V’)
3. Connect the test leads to the measured circuit.
4. The meter will automatically detect and display AC or DC
voltage. The meter will also automatically select the
appropriate range.
5. Read the voltage (main display) and frequency (upper,
smaller display digits) on the LCD.
NOTE: The sensitivity for Automatic AC/DC Voltage detection is
1V. Voltage below 1V may indicate DC.
NOTE: The sensitivity for voltage measurements is 1.2V and the frequency range is
40Hz to 1 KHz. If the frequency is less than 40Hz the LCD may display ‘Hz’.
AC Current Measurements
1. Set the rotary switch to the "~A" position.
2. Press the Trigger to open the jaw.
3. Fully enclose the conductor that is being measured in the jaw. No gap should exist
between the two jaw halves. The conductor under test must be a single wire; if there
are multiple wires in a cable the conductor must first be isolated (see diagram below).
4. The meter selects the range automatically.
5. Read the measured current (main display) and frequency (upper display) on the LCD.
NOTE: The sensitivity for current measurements is 6A and the frequency range is
40Hz to 400Hz. If the frequency is less than 40Hz the LCD may display ‘Hz’.
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AC Power Measurements
1Φ KW, KVA, KVAR, Power Factor & Phase Angle Measurement
1. Set the rotary switch to the ‘KW/KVA’
position.
2. Insert the test leads to the meter as
follows: Black to ‘COM’ and Red to ‘V’.
3. Connect the black lead to the neutral line.
4. Connect the red lead to the power line
and clamp onto the same lead to which
the red lead is connected.
5. The meter selects the best range
automatically.
6. Select the desired display combination
using the RANGE key. Press RANGE to
scroll through the following combination displays:
ƒ
ƒ
ƒ
ƒ
ƒ
kW and HP (horsepower)
kW and PF (power factor)
kW and KVAR (reactive power)
KVA and phase angle (θ)
V and A
Note that LEAD and LAG icons are also displayed on the LCD to inform the user that the
voltage is leading or lagging the current with regard to phase.
Note: Allow 2 seconds after each RANGE key press for the meter to update the display.
1 HP = 746 Watts
KW
= cosθ
PF =
KVA
KVA (Apparent Power) = (V*A) / 1000
(KVA)2 −(KW)2
KVAR (Reactive Power) =
= KVA sinθ
*
NOTES
1. The ‘+’ sign printed on the meter must face the power source for best accuracy.
2. If the device under test is a switching mode power supply, the KW, PF, and
Phase angle measurements may not be accurate.
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3Φ 3-Wire KW, HP, KVA, KVAR, Power Factor & Phase Angle Measurement
1. First, measure WRS(L1L2) (refer to the diagram below).
a. Set the rotary switch to the “
V ”.
b. Press and hold the “HOLD” key while setting the rotary switch to “KW/KVA”, the
3φ3W and WL12 symbols will appear.
c. Insert the test leads into the jacks.
d. Select a phase (e.g. S or L2) as COM and connect the test probe of the COM
(black) terminal to that phase (e.g. S or L2).
e. Connect the test probe of V (red) terminal to the second phase (e.g. R or L1).
f.
Clamp the same phase as step e. (e.g. R or L1).
g. The power clamp will automatically select the proper range.
h. Wait until the reading is stable (about 6 seconds). Press the “HOLD” key to store
the measured value. The WL23 symbol will appear.
2. Second, measure WTS(L3L2) (refer to the diagram that follows the steps below).
a. Disconnect the test probe from the phase where the jaw clamp was set in the
previous measurement.
b. Connect the test probe to the third phase (e.g. T or L3).
c. Clamp the third phase where test probe is connected to (e.g. T or L3)
d. The power clamp will automatically select the proper range.
e. Wait until the reading is stable (about 6 seconds) and then press the “HOLD” key
to store the measured value.
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3. The power clamp will process these two sets of data (WL12 , WL23), and show the result
on the LCD. The WL123 symbol will be shown to indicate 3 3W power. The 3 3W power
φ
φ
(in watts) is stored in the meter memory.
4. To read a single data record, press the “HOLD” key to select desired WL12 , WL23
or WL123 display then press the “RANGE” key to select KW+HP (Horse Power),
KW+PF (Power Factor), KW+KVAR, KVA+θ(Phase Angle) or A+V.
5. W3 3W = WRS(L1L2) + WTS(L3L2)
φ
2
2
KVA3φ3W = K
3φ3W + KVAR 3φ3W
W
KW
3φ3W
PF3φ3W
=
KVA
3φ3W
6. Set the rotary switch to another position to exit this mode and clear the stored data.
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NOTE
Once a phase is selected as COM, users can not change this selection in the
subsequent measurement. For example, if S (or L2) phase is selected, S (or L2)
phase is always connected to the COM during measurement of WRS (or WL1L2) and
W
TS (or WL3L2) in 3 3W unbalanced power.
φ
NOTE
1. The "+" sign printed on Panel must face the power source for accurate
measurement.
2. If the device under test is a switching power supply, the meter KW, PF and θ
reading maybe incorrect.
NOTE
For 3 3W unbalanced power measurements, W
or W
could be negative.
TS
φ
RS
Ensure that all connections are correct before accepting a reading as valid.
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3Φ 4-Wire KW, HP, KVA, KVAR, Power Factor & Phase Angle Measurement
1. First, measure WR(L1) (refer to the diagram below).
a. Set the rotary switch to the “
V ” position.
b. Press and hold the “RANGE” key while setting the rotary switch to the “KW/KVA”
position, the 3φ4W and WL1 symbols should appear.
c. Insert the test leads into the input jacks.
d. Connect the neutral line to the COM (black) terminal.
e. Connect the test probe of the V (red) terminal to the first phase (e.g. R or L1).
f.
Clamp on to the same phase (e.g. R or L1).
g. The power clamp meter will automatically select the proper range.
h. Wait until the reading is stable (about 6 seconds) and then press the “HOLD” key;
the WL1 symbol will clear and the WL2 symbol will appear in order to instruct users
to take the WS(L2) measurement.
2. Second, measure WS(L2) (refer to the diagram that follows the steps below)
a. Disconnect the test probe from the phase where the jaw was clamped in the
previous measurement.
b. Connect the test probe of the V (red) terminal to the second phase (e.g. S or L2).
c. Clamp on to the phase where the test probe is connected (e.g. S or L2 phase)
d. The power clamp will automatically select proper range.
e. Wait until the reading is stable (about 6 seconds) and then press the “HOLD” key;
the WL2 symbol will disappear. The WL3 symbol will appear to instruct users to take
the WT(L3) measurement.
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3. Third, measure W
(refer to the diagram that follows the steps below)
T(L3)
a. Disconnect the test probe from the phase where the jaws were clamped in the
previous measurement.
b. Connect the test probe of the V (red) terminal to the third phase (e.g. T or L3
phase).
c. Clamp the phase where the test probe is connected to (e.g. T or L3).
d. The power clamp will automatically select the proper range.
e. Wait until the reading is stable (about 6 seconds), and then press the “HOLD” key;
The WL3 symbol will disappear.
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4. The power clamp will process these three sets of data (WL1, WL2 WL3) and show the result on
the LCD. The WL123 symbol will be shown to indicate the 3 4W power (refer to diagram).
φ
The 3 4W power value in watts is now stored in the meter’s memory.
φ
5. To read a single data record, use the “HOLD” key to select WL1, WL2, WL3 or
WL123 display then press the “RANGE” key to select KW+HP (Horse Power),
KW+PF (Power Factor), KW+KVAR, KVA+θ(Phase Angle) or A+V displays.
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6. W3 4W = WR(L1) + WS(L2) WT(L3)
φ
2
2
KVA
3φ4W
= K
3φ4W
+ KVAR
3φ4W
W
KW
3φ4W
3φ4W
PF3φ4W
=
KVA
7. Set the rotary switch to another position to exit this mode and clear the stored data.
NOTE
1. The "+" sign printed on meter must face the power source for accurate
measurement.
2. If the device under test is switching power supply, the KW, PF and θ readings
may not be correct.
NOTE
For 3 4W power measurements, WR or WS and WT must be positive. If one shows
φ
negative power, check the connections.
Resistance and Audible Continuity Measurements
WARNING
Before taking any in-circuit resistance measurements remove power from the circuit
under test and discharge all capacitors.
1. Set the rotary switch to the ‘Ω, ’
2. Insert the test leads into the input jacks. (Black to ‘COM’ and
Red to ‘Ω’
’
or ‘MΩ’ position.
)
3. Connect the test leads to the circuit or component under test.
4. Read the resistance value on the LCD.
5. For measurements < 40
Ω
, the continuity beeper will sound.
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Capacitance Measurements
1. Fully discharge the capacitor under test before proceeding.
2. Insert the test leads into the input jacks. (Black to ‘COM’ and
Red to ‘
’).
3. Set the rotary switch to the ‘
’ position.
4. Connect the red and black test leads to the capacitor. For
Electrolytic (polarized) capacitors, connect the red test lead to
the positive side and the black lead to the negative side.
5. Read the capacitance value displayed on the LCD.
Note: Large valued capacitors will take a long period of time to charge and to auto-range
to the correct range. (up to 60 seconds in the worst case). For improved resolution
and shortest test time, manually pre-selecting the proper range is recommended.
Diode Tests
1. Set the rotary switch to the "
" position.
2. Insert the test leads into the input jacks. (Black to ‘COM’ and Red to ‘
’)
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:
a. If one reading shows a value and the other reading shows ‘OL’ (overload), the
diode is good.
b. If both readings show ‘OL’, the device is open.
c. If both readings are very small or zero, the device is shorted.
d. Note that the audible continuity function is operational in this mode (<40mV).
Temperature Measurements
1. Set the rotary switch to the "TEMP" position.
2. Press the RANGE button to select the desired unit of measure (C or
F).
3. Insert the Type K Thermocouple into the subminiature input jacks
located to the lower left of the rotary selector switch.
4. Touch the thermocouple sensor to the object under test.
5. Read the temperature value on the LCD.
AC and DC µA Measurements
1. Set the rotary switch to the "
" position.
µA
2. Insert the test leads into the input jacks. (Black to ‘COM’ and
Red to ‘µA’)
3. Connect the test leads in series with the circuit or device
under test.
4. The meter will automatically select AC or DC and the
appropriate range.
5. Read the current value on the LCD.
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Meter Control Keys
HOLD - MX/MN Key
Data Hold Function
Press this key momentarily to put the meter into Data Hold mode (HOLD will appear on
the LCD). In this mode, the meter freezes the displayed reading. To exit the Data Hold
mode, press the key again (the HOLD icon will switch off). Note that the Data Hold
mode is not available for Capacitance measurements.
MX/MN (Maximum and Minimum reading mode)
The MX/MN mode permits the user to record and recall the highest and lowest readings.
The MX/MN feature is available for ACA, ACV, DCV, TEMP, and µA functions only. The
following steps outline the MX/MN feature:
1. Take an ACA, ACV, DCV, TEMP, or µA measurement as described earlier.
2. Press and hold the MX/MN key for 2 seconds.
3. The Elapsed Timer (top display) and the MX/MN & ® indicators will appear on the
LCD.
4. The Elapsed Timer shows the duration of the measurement session in Minutes and
Seconds (the Elapsed Timer switches to Hours and Minutes after 60 minutes). The
maximum recording time is 100 hours.
5. The ® indicator informs the user that the measurement range is being held. Note
that the AUTO POWER OFF feature is disabled in the MX/MN mode.
6. Press the MX/MN key again to view the highest reading and the time (shown on
the Elapsed Timer) that the reading was taken. The ‘MX’ icon will appear on the
LCD.
7. Press the MX/MN key again to view the lowest reading and the time (shown on the
Elapsed Timer) that the reading was taken. The ‘MN’ icon will appear on the LCD.
8. Press again to view the current elapsed time and measurement.
9. To exit this mode, press and hold the MX/MN key until MX/MN indicators switch off.
Using the HOLD button for Power Measurements
Refer to the power measurement section of this manual for details.
RANGE Key
The RANGE Key operation varies from mode to mode. Refer to the information below:
In ACA, ACV, DCV, A, Capacitance, and Resistance modes:
µ
1. Press RANGE to enter the Manual Range mode (the ® indicator will appear).
2. Press RANGE again to select the desired range manually.
3. Press and hold the RANGE key to exit this mode (the ® indicator switches off).
In KW/kVA mode:
As described earlier, use the RANGE key to select the desired display combination:
KW & PF, KW & KVAR, KVA & Phase angle, or Current / Voltage.
In TEMP mode:
Use the RANGE key to select the desired unit of measure (oC or oF).
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Automatic Sleep Mode and Battery Replacement
The Meter is powered by a 9V battery. An AUTO SLEEP feature is included to preserve
battery life.
Note: The Auto Power OFF feature is disabled when the meter is in the MIN/MAX mode
Note: In the sleep mode the meter continues to draw a small amount of battery current.
Always turn the function switch to the OFF position when storing the meter.
Note: To restore operation after the sleep mode has engaged, turn the function switch to
the OFF position and then back to the function desired.
Auto Sleep Disable
The meter automatically goes to sleep mode after 30 minutes to conserve battery energy.
To defeat this feature:
1. Turn the meter OFF.
2. Press and hold the HOLD key while turning the selector switch to the AC Amps
position.
3. Release HOLD when the clock icon appears on the LCD.
Battery Replacement
WARNING
To prevent electrical hazard or shock, turn off the meter and disconnect test
leads before removing the back cover.
+
When the battery power falls low, the LCD will display the battery icon
To replace the 9V battery:
.
1. Set the Range switch to the OFF position.
2. Remove the back cover by first removing the rear screws and then prying open the
housing.
3. Replace the 9V battery.
4. Reassemble the meter housing.
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Specifications
General Specifications
Display
Dual Display; 4-digit, 10,000 count (0 to 9999) LCD
1.6” (42mm)
Jaw Opening
Max. Input limit
Sampling rate
Max. voltage between any terminal and ground: 600Vrms
2.5 times per second (Digital Display); Once every 6
seconds (KW, KVA, and KVAR)
Auto Sleep
After approx. 30 minutes (feature can be defeated)
Battery symbol appears on the LCD
9V Battery
Low battery indication
Power supply
Battery life
Approx. 32 hours with alkaline battery
32 to 122oF (0 to 50oC)
Operating Temperature
Operating Humidity
Operating Altitude
Storage Temperature
Storage Humidity
Temperature coefficient
< 80% RH
7000 ft. (2000 meters) maximum.
14 to 140oF (-10 to 60oC)
< 70% RH
0.1 x (specified accuracy) / oC at < 64oF (18oC), > 82oF
(28oC)
Dimensions
Weight
9.0 x 3.0 x 1.5" (228 x 76 x 39mm)
Approx. 1.0 lb. (465g)
CE, UL
Approvals
Safety
This meter is intended for indoor use and protected, against
the users, by double insulation per EN61010-1 and
IEC61010-1 2nd Edition (2001) to CAT III 600V; Pollution
Degree 2. The meter also meets UL 61010A-1, First Edition
UL Listed
The UL mark does not indicate that this product has been
evaluated for the accuracy of its readings.
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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Measurement Specifications
Accuracy: ±(% of rdg + number of digits) from 18oC to 28oC (64oF to 82oF) R.H. < 80%
AC Current (50Hz to 400Hz) True RMS
Range
Overload Protection
1000A
99.99A
999.9A
± (2%
± (4
+
+
20d) (50, 60Hz)
20d) (40~400Hz)
%
100mA
1.0A
μA True RMS (AC+DC)
Range
±(1% + 20d)
Overload Protection
600V
2.0µA
99.99
999.9
μ
A
A
100nA
μ
Burden Voltage: 5mV/µA
AC Voltage (50Hz to 400Hz) True RMS
Range
Overload Protection
999.9mV
±(1% + 20d) (50, 60Hz)
±(2% + 20d) (40~100Hz)
600V
9.999V
99.99V
600.0V
100mV
2V
±(1% + 20d) (50, 60Hz)
±(2% + 20d) (40~400Hz)
Input impedance: 3M
Ω
DC Voltage
Range
999.9mV
9.999V
99.99V
600.0V
Overload Protection
600V
±(1.0% + 20d)
100mV
2V
Input resistance: 3M
Ω
Resistance (Audible Continuity for readings <40Ω on the 999.9Ω range)
Range
Overload Protection
600V
999.9
9.999K
99.99K
999.9K
Ω
Ω
Ω
Ω
± (1% + 10d)
100
Ω
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MΩ (Resistance)
Range
10K
Overload Protection
600V
9.999M
99.99M
Ω
Ω
±(5% + 10d)
Ω
Capacitance
Range
Overload Protection
600V
10.000
100.00
1000.0
μ
μ
μ
F
F
F
±(1.5% + 5d)
±(2.5% + 15d)
7000
μ
F
μ
1 F
Diode (Continuity <40mV)
Range
2.000V
1mV
Overload Protection
600V
±(2
%
+ 1d)
Temperature (K-Type thermocouple)
Range
0.1oF
Overload Protection
30VAC or 60VDC
-50oC to 900oC
-58oF to 1000oF
±(1% + 2oF
)
1Φ/3Φ TRUE Power (PF > 0.5 or
K
< 60o) (50/60Hz)
Range
Overload Protection
60.00KW (<100A)
600.0KW (>100A)
±(5% + 20d)
600VAC/
1000AAC
100W
1Φ/3Φ Horse Power (HP) (PF > 0.5 or
K
< 60o) (50/60Hz)
Range
0.1 HP
Overload Protection
600VAC/1000AAC
80.00HP (<100A)
800.0 HP (>100A)
±(5% + 20d)
1Φ/3Φ Reactive Power (KVAR) (PF > 0.5 or
K
< 60o) (50/60Hz)
K
Range
Overload Protection
60.00KVAR (<100A)
600.0KVAR (>100A)
±(5% + 20d)
600VAC/
1000AAC
100VAR
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1Φ/3Φ Apparent Power (KVA)
Range
Overload Protection
600VAC/1000AAC
60.00KVA (<100A)
600.0KVA (>100A)
±(2.5% + 20d)
100VA
Phase Angle (50/60Hz)
Range
0.1º
±6.0º
Sensitivity
-60° ~ 0° ~ +60°
ACV>100V, ACA>10A
Frequency
Range
0.1Hz
Sensitivity
40Hz/1KHz
±(0.5% +
2
d)
ACV>5V, ACA>6A
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Service Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
ꢀꢁ
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User Guide, Software updates, and other
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Copyright © 2007 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
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