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MN25
Data Sheet
1 pgs106.65 Kb0
Operating Manual
15 pgs290.45 Kb0
User Guide
1 pgs291.43 Kb0

Extech MN25 Operating Manual

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User's Guide
MiniTecTM Series
Model MN25 MultiMeter
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) 890­7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA number). 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.
Introduction
Congratulations on your purchase of Extech’s MN25Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency, Duty Cycle, Temperature, Diode Test and Continuity. Proper use and care of this meter will provide many years of reliable service.
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Safety
This meter has been designed for safe use, but must be operated with caution. The rules listed below must be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
Input Limits
Function Maximum Input
V DC, V AC 600V DC/AC, 200Vrms on 200mV range
mA DC 200mA 250V fast acting fuse
A DC, A AC 10A 250V fast acting fuse(30 seconds
Resistance, Continuity
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 500V above earth ground.
4. NEVER connect the meter leads across a voltage source while the function switch is in the current, resistance, or diode mode. Doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads before opening the doors to replace the fuse or batteries.
max every 15 minutes)
250Vrms for 15sec max
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Safety Symbols
WARNING
CAUTION
MAX 500V
NEVER operate the meter unless the back
cover and the battery and fuse doors are in place and fastened securely. This symbol adjacent to another symbol, terminal or operating device indicates that the operator must refer to an explanation in the Operating Instructions to avoid personal injury or damage to the meter.
This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.
This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result damage to the product.
This symbol advises the user that the terminal(s) so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds (in this case) 500 VAC or VDC.
This symbol adjacent to one or more terminals identifies them as being associated with ranges that may, in normal use, be subjected to particularly hazardous voltages. For maximum safety, the meter and its test leads should not be handled when these terminals are energized.
This symbol indicates that a device is protected throughout by double insulation or reinforced insulation.
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Specifications
Function Range Resolution Accuracy
DC Voltage (V DC)
(V AC)
DC Current (A DC)
AC Current (A AC)
Resistance
NOTE: Accuracy specifications consist of two elements:
• (% reading) – This is the accuracy of the measurement circuit.
• (+ digits) – This is the accuracy of the analog to digital
converter.
NOTE: Accuracy is stated at 65
than 75% RH.
200mV 0.1mV
2000mV 1mV
20V 0.01V
200V 0.1V
600V 1V
200V 0.1V AC Voltage
600V 1V
200mA
10A 10mA
200mA
10A 10mA
200Ω 0.1Ω
2000Ω 1Ω
20kΩ 0.01kΩ
200kΩ 0.1kΩ
2000kΩ 1kΩ
9V 10mV Battery Test
1.5V 10mV
100µA
100µA
o
F to 83oF (18oC to 28oC) and less
± (0.5% reading + 2 digits)
± (1.5% reading + 5 digits (Frequency 50/60Hz)
± (1.2% reading + 2 digits)
± (2.0% reading + 2 digits)
± (1.8% reading + 5 digits)
± (3.0% reading + 5 digits)
± (0.8% reading + 2 digits)
± (1.0% reading + 2 digits)
± (1.0% reading + 2 digits)
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Display 3 ½ digit, 2000 count LCD, 0.5” digits Overrange indication “1” is displayed Diode Test Test current of 1mA maximum, open
circuit voltage 2.8V DC typical
Continuity Check Audible signal will sound if the
resistance is less than approximately 30Ω
Battery Test current 9V (6mA); 1.5V (100mA) Input Impedance >1MΩ ACV Bandwidth 45Hz to 450Hz DCA voltage drop 200mV Polarity Automatic (no indication for positive
polarity); Minus (-) sign for negative polarity.
Measurement Rate 2 times per second, nominal Low Battery Indication ‘BAT’ is displayed if battery voltage
drops below operating voltage
Battery 9 Volt Battery Fuses mA, µA ranges; 0.2A/250V fast blow
A range; 10A/250V fast blow
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 7000ft. (2000) meters maximum. Weight 9.17 oz. (260g). Size 4.78 x 2.38 x 1.57” (121.5 x 60.6 x
40mm)
Safety For indoor use and in accordance with
Overvoltage Category II, Pollution Degree 2. Category II includes local level, appliance, portable equipment, etc., with transient overvoltages less than Overvoltage Category III.
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Meter Description
1. LCD Display
2. Function switch
3. 10A jack
4. COM jack
5. Positive jack
Note: Tilt stand, fuse and battery
compartment are on rear of unit.
LCD Display Indicators
•))) Continuity
Diode test
m milli ( volts, amps)
k kilo (ohms)
Ω ohms
V DC volts direct current
V AC volts alternating current
A DC amps direct current
A AC amps alternating current
BAT Low battery and battery test
1
2
5
3 4 5
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Operation
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care.
1. ALWAYS turn the function switch to the OFF position when
the meter is not in use.
2. If “OL” appears in the display during a measurement, the
value exceeds the range you have selected. Change to a higher range.
NOTE: On some low AC and DC voltage ranges, with the test leads not connected to a device, the display may show a random, changing reading. This is normal and is caused by the high-input sensitivity. The reading will stabilize and give a proper measurement when connected to a circuit.
DC Voltage Measurements
CAUTION: Do not measure DC voltages if a motor on the
circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter.
1. Set the function switch to the highest VDC
position.
2. Insert the black test lead banana plug into
the negative (COM) jack. Insert the red test lead banana plug into the positive (V) jack.
3. 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.
4. Read the voltage in the display. Reset the function switch to
successively lower V resolution reading. The display will indicate the proper decimal point and value. If the polarity is reversed, the display will show (-) minus before the value.
DC positions to obtain a higher
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AC Voltage Measurements
WARNING: Risk of Electrocution. The probe tips may not be
long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter.
1. Set the function switch to the highest VAC
position.
2. Insert the black test lead banana plug into
the negative (COM) jack. Insert red test lead banana plug into the positive (V) jack.
3. 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.
4. Read the voltage in the display. Reset the function switch to
successively lower V
AC positions to obtain a higher
resolution reading. The display will indicate the proper decimal point and value.
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DC Current Measurements
CAUTION: Do not make current measurements on the 10A
scale for longer than 30 seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana
plug into the negative (COM) jack.
2. For current measurements up to
200mA DC, set the function switch to the 200m A
DC position and insert the
red test lead banana plug into the (mA) jack.
3. For current measurements up to 10A
DC, set the function switch to the 10A range and insert the red test lead banana plug into the (10A) jack.
4. Remove power from the circuit under
test, then open up the circuit at the point where you wish to measure current.
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. Apply power to the circuit.
7. Read the current in the display. The display will indicate the
proper decimal point and value.
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AC Current Measurements
CAUTION: Do not make current measurements on the 10A
scale for longer than 30 seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug
into the negative (COM) jack.
2. For current measurements up to 200m
A AC, set the function switch to the
AC position and insert the red
200m A test lead banana plug into the (mA) jack.
3. For current measurements up to 10A
AC, set the function switch to the 10A range and insert the red test lead banana plug into the (10A) jack.
4. Remove power from the circuit under
test, then open up the circuit at the point where you wish to measure current.
5. Touch the black probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display. The display will indicate the
proper decimal and value.
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Resistance Measurements
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords.
1. Set the function switch to the highest 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 Ω 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 and then set the function
switch to the lowest Ω position that is greater than the actual or any anticipated resistance. The display will indicate the proper decimal point and value.
Battery Test
1. Insert the black test lead banana plug into the negative COM
jack and the red test lead banana plug into the positive V jack.
2. Select the 1.5V or 9V BAT position using the function select
switch.
3. Connect the red test lead to the positive side of the 1.5V or
9V battery and the black test lead to the negative side of the
1.5V or 9V battery.
4. Read the voltage in the display.
Good Weak Bad
9V battery: >8.2V 7.2 to 8.2V <7.2V
1.5V battery: >1.35V 1.22 to 1.35V <1.22V
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Diode Test
1. Insert the black test lead banana plug into the negative COM
jack and the red test lead banana plug into the positive diode jack.
2. Turn the rotary switch to the position.
3. Touch the test probes to the diode under test. Forward
voltage will indicate 400 to 700mV. Reverse voltage will indicate “I”. Shorted devices will indicate near 0mV. Shorted devices will indicate near 0mV and an open device will indicate “I” in both polarities.
Continuity Check
WARNING: To avoid electric shock, never measure continuity
on circuits or wires that have voltage on them.
1. Set the function switch to the position.
2. Insert the black lead banana plug into the negative (COM)
jack Insert the red test lead banana plug into the positive (Ω) jack.
3. Touch the test probe tips to the circuit or wire you wish to
check.
4. If the resistance is less than approximately 30Ω, the audible
signal will sound. If the circuit is open, the display will indicate “1”.
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Maintenance
Battery Replacement
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the battery door.
When the batteries drop below the operating voltage, ‘BAT’ will appear in the right-hand side of the LCD display. The batteries should be replaced as follows.
1. Disconnect the test leads from the meter.
2. Remove the protective rubber holster (if
installed).
3. Open the battery door by loosening the
screw using a Phillips head screwdriver.
4. Insert the battery into battery holder,
observing polarity.
5. Put the battery door back in place.
Secure with the screw.
Fuse Replacement
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the fuse door.
1. Disconnect the test leads from the meter and any item under
test.
2. Remove the protective rubber holster.
3. Open the fuse door by loosening the screw on the door
using a Phillips screwdriver.
4. Remove the old fuse from its holder by gently pulling it out.
5. Install the new fuse into the holder.
6. Always use a fuse of the proper size and value (0.2A/250V
fast blow for the 200mA range, 10A/250V fast blow for the 10A range).
7. Put the fuse door back in place. Insert the screw and tighten
it securely.
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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.
Tech support: Ext. 200; Email: support@extech.com Repair/Returns: Ext. 210; Email: repair@extech.com
Copyright © 2003 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in
Support Hotline (781) 890-7440
Website: www.extech.com
any form.
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