User’s Guide
400A AC Clamp Meter
Model MA200
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MA200 Version 1.4 06/06
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Introduction
Thank you for selecting the Extech MA200 AC Clamp Meter. This meter measures AC
Current, AC/DC Voltage, Resistance, Diode Test, and Continuity. This professional meter,
with proper care, will provide years of safe 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
A UL mark does not indicate that this product has been evaluated for the accuracy of its
readings.
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 240V.
• When changing ranges using the selector switch always disconnect the test leads
from the circuit under test.
• Do not exceed the maximum rated input limits.
OVERVOLTAGE CATEGORY III
This meter meets the IEC 610-1-95 standard for OVERVOLTAGE CATEGORY III. Cat III
meters are protected against overvoltage transients in fixed installation at the distribution
level. Examples include switches in the fixed installation and some equipment for industrial
use with permanent connection to the fixed installation.
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MA200 Version 1.4 06/06
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Specifications
Function Range Accuracy (of reading)
2.000 ACA ± (2.5% + 10 digits)
20.00 ACA ± (2.5% + 4 digits)
200.0 ACA ± (2.5% + 4 digits)
AC Current
400 ACA ± (3.0% + 5 digits)
200.0mV, ± (1.5% + 30 digits)
2.000V
20.00V
200.0V
± (1.5% + 3 digits)
AC Voltage
600V ± (2.0% + 4 digits)
200.0mV ± (0.5% + 5 digits)
2.000V
20.00V
200.0V
± (1.2% + 3 digits)
DC Voltage
600V ± (1.5% + 3 digits)
200.0 ± (1.0% + 4 digits)
2.000k
20.00k
200.0k
± (1.5% + 2 digits)
2.000M ± (2.0% + 3 digits)
Resistance Ω
20.00M ± (3.0% + 5 digits)
Jaw size 0.9" (23mm) approx.
Display 3-1/2 digits (2000 counts) LCD
Continuity Audible tone < 120Ω approx.
Diode Test Open circuit voltage < 1.5VDC;
Test current 0.3mA (typical)
AC V bandwidth 50Hz to 400Hz
AC A bandwidth 50/60Hz
Low battery indication “BAT” is displayed
Overrange indication “OL” is displayed
Auto Power OFF After 15 minutes
Measurement rate 2 per second, nominal
Input Impedance 7.8MΩ (V DC and V AC)
Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)
Storage Temperature -4
o
F to 140oF (-20oC to 60oC)
Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at
104ºF(40ºC)
Storage Humidity <80%
Operating Altitude 6560ft. (2000meters)
Batteries (2) 1.5V AAA batteries
Weight 0.44lb (200g)
Size 7.87” x 1.97” x 1.38” (200x50x35mm)
Safety For indoor use and in accordance with the requirements for
double insulation to IEC1010-1 (1995): EN61010-1 (1995)
Overvoltage Category III, Pollution Degree 2.
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Meter Description
1. Transformer jaws
2. MAX Hold button
3. Hold button
4. LCD Display
5. COM Input Terminal
6. Jaw opening trigger
7. Function select switch
8. Voltage, Resistance Input Terminal
9. Mode Select Button
10. Backlight Button
11. Range Select Button
AC Alternating current
DC Direct currrent)
AUTO AutoRange mode
MAX MAX Hold mode
Diode test mode
•))) Audible Continuity
HOLD Data Hold mode
Low Battery icon
1
2
7
3
4
9
11
5 8 10
6
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MA200 Version 1.4 06/06
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Operation
NOTICES: Read and understand all warning and precaution statements listed in the
safety section of this operation manual prior to using this meter. Set the function select
switch to the OFF position when the meter is not in use.
AC Voltage Measurements
1. Set the rotary function switch to the VAC position.
2. Insert the black test lead banana plug into the negative
(COM) jack and the red test lead banana plug into the
positive (V/Ω) jack
3. Touch the test probe tips to the circuit under test
4. Read the voltage in the display. The display will indicate
the proper decimal point and value
DC Voltage Measurements
1. Set the rotary function switch to the VDC position.
2. Insert the black test lead banana plug into the negative (COM) jack and
the red test lead banana plug into the positive (V/Ω) jack
3. Touch the test probe tips to the circuit under test. Be sure to observe
the correct polarity (red lead to positive, black lead to negative)
4. Read the voltage in the display. The display will indicate the proper
decimal point and value. If the polarity is reversed, the display will show
(-) minus before the value
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AC Current Measurements
WARNING: Ensure that the test leads are disconnected from
the meter before making current clamp measurements.
1. Set the Function switch to the 400 or 200A range. If the
range of the measured is not known, select the higher range
first then move to the lower range if necessary.
2. Press the trigger to open jaw. Fully enclose one conductor to
be measured.
3. The clamp meter LCD will display the reading.
Resistance Measurements
1. Set the function switch to the
Ω •))) position.
2. Insert the black test lead banana plug into the negative
(COM) jack
Insert the red test lead banana plug into the positive (VΩ)
jack.
3. Touch the test probe tips across the circuit or part under
test. It is best to disconnect one side of the part under test
so the rest of the circuit will not interfere with the
resistance reading.
4. Read the resistance in the display. The display will
indicate the proper decimal point and value.
Continuity Check
1. Set the function switch to the
Ω •))) position.
2. Push the mode button to indicate •))) on the display.
3. Insert the black lead banana plug into the negative
(COM) jack
Insert the red test lead banana plug into the positive
(VΩ) jack.
4. Touch the test probe tips to the circuit or wire you
wish to check.
5. If the resistance is less than approximately 30Ω, the
audible signal will sound. If the circuit is open, the
display will indicate “OL.”.
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Diode Test
1. Turn the rotary switch to the
Ω •))) position.
2. Insert the black test lead banana plug into the negative
(COM) jack and the red test lead banana plug into the
positive (VΩ)
jack.
3. Push the mode button to indicate on the display.
4. Touch the test probes to the diode under test. Forward
voltage will indicate 400 to 700mV. Reverse voltage will
indicate “OL”. Shorted devices will indicate near 0mV.
Shorted devices will indicate near 0mV and an open
device will indicate “OL” in both polarities.
Data Hold
To freeze the LCD meter reading, press the data hold button. The data hold button is
located on the left side of the meter (bottom button). While data hold is active, the HOLD
display icon appears on the LCD. Press the data hold button again to return to normal
operation.
MAX Hold
To hold the highest reading on the LCD, press the MAX button. The max hold button is
located on the left side of the meter (top button). While data hold is active, the MAX display
icon appears on the LCD. The meter reading will not change as readings change, rather it
will only display the highest reading encountered since the max hold button was pressed.
Press the max hold button again to return to normal operation.
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MA200 Version 1.4 06/06
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Support Hotline (781) 890-7440
Tech support: Ext. 200; Email: support@extech.com
Repair/Returns: Ext. 210; Email: repair@extech.com
Website: www.extech.com
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 with 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 periods of longer than 60 days, remove the
batteries and store them separately
Battery Replacement
1. Remove the two rear Phillips head screws
2. Open the battery compartment
3. Replace the two 1.5V AAA batteries.
4. Re-assemble the meter
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 on 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 (781) 890-7440 ext. 210 for authorization. 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.
Repair and Calibration Services
Extech offers complete repair and calibration services for all Extech products. For
periodic calibration, NIST certification or repair of any Extech product, call customer service
for details on services available. Extech recommends that calibration be performed on an
annual basis to insure calibration integrity.
Copyright © 2003 Extech Instruments Corporation. All rights reserved
including the right of reproduction in whole or in part in any form.
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