Extech MN25 Operating Manual
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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MN25 Version 2.2 Aug 2003
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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MN25 Version 2.2 Aug 2003
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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MN25 Version 2.2 Aug 2003
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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MN25 Version 2.2 Aug 2003
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