Extech Instruments 382075 User manual

User's Guide
2000A True RMS 3-Phase Clamp
Power Analyzer
Model 382075
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Support line [phone]
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
up-to-the-minute product information, visit our website:
www.extech.com
Introduction
Congratulations on your purchase of the Extech Model 382075 Auto Range Power
Clamp-On Meter. This meter is shipped fully tested and calibrated and, with proper use,
will provide years of reliable service.
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
[phone] ext. 210 for authorization or visit our website www.extech.com for contact
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.
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.
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Table of Contents
Safety 4
Meter Functional Description 5
Operating Instructions 6
AC/DC Voltage Measurements 6
AC/DC Current Measurements 7
AC/DC 1φ2W Power (W) and Power Factor (PF) measurements 7
AC/DC 1φ2W Apparent/Reactive Power Measurements (KVA+KVAR) 8
Phase Angle Measurements 8
3φBalanced Power Measurements 9
3φ3W Unbalanced Power Measurements 10
3φ4W Unbalanced Power Measurements 11
1φ3W Power Measurement 13
Calculation of 3φ4W Power Factor (PF) 14
Improving the Power Factor of a 3φ4W Power System 14
Improving the Power Factor of a 3φBalanced Power System 14
Improving Power Factor of a 1φ2W Power System 14
Phase Sequence Indication 15
Recording Data 15
Recalling Data from Memory 15
Specifications 16
Battery Replacement 18
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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
Safety Notes
•Do not exceed the maximum allowable input range of any function.
•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.
•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.
•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.
•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.
Function Input Protection
A AC, A DC 3000A DC/AC
V AC 750V AC
V DC, 1000V DC
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Meter Functional Description
1. Transformer Jaw
Used to sense current signal. To measure current or power,
the conductor under test must be fully enclosed by the jaw.
2. Transformer Trigger
Press to open the jaw.
3. Data Hold Button
Press to freeze most recent reading on the LCD. Press
again to release.
4. Function Select and On/Off Switch
Select desired function, such as KW, V, A, KVA, or 3φ.
5. LCD Display
4-digit (9999 count) display with function symbols, units,
decimal point, low battery icon, and zero indication.
6. Units Symbols
Once a function is selected, the corresponding unit (KW, V,
A, Phase, KVA, or 3φ) will be displayed.
7. 3φ3W and 3φ4W Select Button
If the 3φsystem is not a balanced system, users can press
this button to select 3φ3W, 3φ4W or a balanced system.
Once the button is pressed, the LCD displays 3φ3W or 3φ4W
depending on the function selected.
8. Read/Next Button
•When the rotary switch is set to the 3φfunction, the READ/NEXT button is used as a
NEXT button. In the 3φbalanced mode, pressing the NEXT button will display W+PF,
KVA+KVAR, or V+A data.
•In the 3φ3W mode, pressing the NEXT button stores the measured values WRS(L1L2)
and WTS(L3L2). After two values are measured and stored, the meter adds the two
values, displays the result with the symbol WRST to represent W3φ3W. To start another
W3φ3W measurement, press the NEXT button again.
•In the 3φ4W system mode, press the NEXT button to store the measured values
WR(L1), WS(L2) and WT(L3). After three values are measured and stored, the meter
adds the three values, displays the result with the symbol WRST to represent W3φ4W.
To start another W3φ4W measurement, press the NEXT button again.
•If the rotary switch is not set to the 3φfunction, the READ/NEXT button is used as a
READ button. Stored data in memory (saved by pressing the REC button) can be read
by pressing READ.
9. & 10. V and COM Input Terminals
Used as positive and negative (common) inputs for voltage measurements.
11. DC A/W ZERO button
Press this button once to zero the Amp or Watt display. While the meter is zeroing, the
word ZERO appears the LCD.
12. REC button
Press the REC button to store up to 4 data points in meter memory.
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Operating Instructions
NOTE: Ensure that the jaws are clear of any conductors before applying power to the
meter. The meter performs an auto zero upon power-up to null any residual magnetism.
If this is done with a conductor inside the jaw area, the auto zero function will cause
subsequent measurements to be inaccurate.
AC/DC Voltage Measurements
Voltage (V) and Frequency (Hz) Dual Display
WARNING: Maximum input voltages: 1000VDC and
750VAC. Do not attempt to measure voltage that
exceeds these limits.
1. Set the rotary switch to the Voltage position (V).
2. Insert the test leads into the input terminals.
3. Connect the test leads in PARALLEL with the circuit to be
measured.
4. The power clamp will automatically select the proper range.
5. Read the voltage and Frequency values displayed on the LCD.
NOTE: The sensitivity for voltage/frequency measurements is 1V, and the
frequency range is 10 - 400Hz. If the frequency is < 10 Hz, the LCD will
indicate 0 Hz. If the frequency is > 400 Hz, LCD will show OL.
Voltage(V) / Current (A) Dual Display
Follow the instructions in the section entitled "3φBalanced Power Measurements" to
monitor V and A simultaneously.
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AC/DC Current Measurements
Current (A) + Frequency (Hz) Dual Display
WARNING: Make sure that test leads are disconnected from the meter during current
measurements.
1. Set the rotary switch to the Amps position (A).
2. Push and hold the DCA/DCW ZERO button to zero the
reading.
3. Press the trigger to open the jaw and fully enclose the
conductor to be measured. The Jaws must be completely
closed to make a measurement.
4. Read the current/frequency values on the LCD.
NOTE: The sensitivity for current/frequency
measurement is 5A, and the frequency range is 10 -
400Hz. If the frequency is < 10 Hz, the LCD will display 0
Hz. If the frequency is > 400 Hz, LCD will display "OL".
Voltage (V) and Current (A) Dual Display
Follow the instructions in the section entitled "3φBalanced Power Measurements" to
monitor Voltage and Current simultaneously.
AC/DC 1φ2W Power (W) and Power Factor (PF) measurements
1. Apply power to the meter with the jaws
clear of any conductors.
2. Set the rotary switch to the Watts
function (KW).
3. If the watt reading is not zero, press the
DCA/DCW ZERO button once to zero it.
4. Insert the test leads into the input
terminals.
5. Connect the COM (black) terminal to the
neutral line.
6. Connect the V (red) terminal to the power
line.
7. Clamp on to the line where the V (red)
terminal is connected. The power clamp will automatically select the proper
measurement range. Read the Watt and PF (Power Factor) values displayed on
the LCD.
NOTE: The "+" sign printed on jaw must face the power source for accurate
measurements.
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AC/DC 1φ2W Apparent/Reactive Power Measurements (KVA+KVAR)
NOTE: Before taking any measurements, zero the current (A) reading and
set the rotary switch to the KVA position.
Follow the steps listed in section entitled DC+AC 1φ2W Power (W) and Power Factor
(PF) measurement for these measurements. KVAR is a calculated value, and its
accuracy greatly depends on the accuracy of the V, A, and KW readings. To obtain a
more accurate KVAR value when PF is greater than 0.91 (φ< 25°), measure the phase
angle and obtain the KVAR from the following equation for a pure sine wave:
KVAR = KVA * sin φ
Phase Angle Measurements
1. Set the rotary switch to the A position. If the current reading is not zero, press the
DCA ZERO button.
2. Set the rotary switch to the Phase position.
3. Insert the test leads into the input jacks.
4. Connect the test lead inserted in the COM (black) terminal to the reference line.
5. Connect the test lead connected to the V (red) terminal to the voltage signal under
test.
6. Clamp on to the wire where the V (red) terminal is connected.
7. If current signal is detected from the jaws, the phase angle will be displayed in
degrees on the LCD together with the frequency of the voltage.
8. If current is not detected, only the frequency of the voltage will be displayed while
the phase angle display will be left blank.
INDUCTIVE LOAD: A negative phase angle indicates that the current signal lags the
voltage signal. A negative phase angle also indicates an inductive load.
CAPACITIVE LOAD: A positive phase angle indicates that the current signal leads
the voltage signal. A positive phase angle also indicates a capacitive load.
NOTE: The "+" sign printed on the clamp jaw must face the power source for correct
readings.
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382075 V2.2V 9/10
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3φBalanced Power Measurements
Power (W) and Power Factor (PF) Dual Display
1. Apply power to the meter with the
jaw clear of any conductors.
2. Set the rotary switch to the 3φ
position.
3. The LCD will show 3φ3W, 3φ4W,
and BAL symbols to indicate
balanced mode.
4. If the watt reading is not zero, press
the DCA/DCW ZERO button once
to zero reading
5. Insert the test leads into the input
terminals.
6. Select one phase (R or L1) as COM and Connect the COM (black) terminal to the
same phase just selected (R or L1).
7. Connect another test lead to the second phase (S or L2).
8. Clamp on to the third phase (T or L3).
9. The power clamp will automatically select proper range.
10. Read the Watt and PF values displayed on the LCD.
11. To view the KVA and KVAR data, press the NEXT button.
12. To view V and A, press the NEXT button again.
13. To return to the W and PF display, press the NEXT button again.
KVA/KVAR Dual Display
Follow steps 1 through 10. in the above section and press the NEXT button. Wait
approx. 2 seconds for the LCD to display the KVA and KVAR.
Voltage (V) and Current (A) Dual Display
Follow steps 1 through 10 in the above section and press the NEXT button twice. Wait
approx. 2 seconds for the LCD to display Voltage (V) and Current (A).
NOTE: Specific selection of each phase is not required in 3φbalanced
power measurement mode. As long as each test lead and the jaws are
connected to different phases, the reading is always correct. The "+" sign
printed on jaw must face the power source for accurate measurement.
NOTE: To find out if a load is capacitive or inductive, refer to the section
entitled "Phase Angle Measurements".
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382075 V2.2V 9/10
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3φ3W Unbalanced Power Measurements
W3φW= WRST = WRS(L1L2)+ WTS(L3L2)
Two measurements WRS (or WL1L2) and WTS (or WL3L2) are required.
1. Measure WRS (or WL1L2)
a. Apply power to the meter with the jaw clear of any conductors.
b. Set the rotary switch to the 3φposition.
c. Press the 3φbutton once, the 3φ3W symbol will display on the LCD. At this
moment, the WRS symbol flashes prompting the user to begin measurement of
WRS.
d. If the watt reading is not zero, press the DCA/DCW ZERO button once to zero
reading
e. Insert the test leads into the input terminals.
f. Select one phase (S or L2, for example) as COM and connect the COM (black)
terminal to that phase (S or L2).
g. Connect V (red) terminal to the second phase (R or L1).
h. Clamp on to the same phase as in step g. (R or L1).
The power clamp will automatically select the proper range.
i. Wait until the reading stabilizes, then press the NEXT button. The WRS (WL1L2)
symbol will disappear. At this moment, WRS is stored in memory, and the WT
(WL3L2) symbol appears flashing to prompt the user to take the WTS (WL3L2)
measurement.
2. Measure WTS (or WL3L2 ).
a. Disconnect the test leads and jaws from the lines in the previous measurement.
b. Connect the test leads to the third phase (T or L3).
c. Open and close the jaws, be sure that no conductor is in the jaws.
d. If the watt reading is not zero, press the DCA/DCW ZERO button once to zero the
reading.
e. Clamp on to the third phase where the test lead is connected (T or L3)
f. The power clamp will automatically select proper range.
g. Wait until the reading stabilizes, then press the NEXT button. The WT(or WL3L2)
symbol will disappear. At this moment, WTS (or WL3L2) data are stored in memory,
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