Extech Instruments MiniTec Series User manual

User’s Manual
MiniTecTM Series MultiMeter
Model MN24
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2 MN24-en-US_V2.2 07/15
Introduction
Congratulations on your purchase of Extech’s MN24 Multimeter. This meter
measures AC/DC Voltage, DC Current, Resistance, Battery Voltage, Diode
Voltage and Continuity. This professional meter is shipped fully tested and
calibrated and, 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
Safety Precautions
1. Improper use of this meter can cause damage, shock, injury or death. Read
and understand this user manual before operating the meter.
2. Make sure any covers or battery doors are properly closed and secured.
3. Always remove the test leads before replacing the battery or fuses.
4. Inspect the condition of the test leads and the meter itself for any damage
before operating the meter. Repair any damage before use.
5. Do not exceed the maximum rated input limits.
6. Use great care when making measurements if the voltages are greater than
25VAC rms or 35VDC. These voltages are considered a shock hazard.
7. Always discharge capacitors and remove power from the device under test
before performing Diode, Resistance or Continuity tests.
8. Remove the battery from the meter if the meter is to be stored for long
periods.
9. Voltage checks on electrical outlets can be difficult and misleading because
of the uncertainty of connection to the electrical contacts. Other means
should be used to ensure that the terminals are not "live".
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3 MN24-en-US_V2.2 07/15
1
2
3
4
5
Description
1. LCD Display
2. Function switch
3. COM jack
4. 10A jack
5. Positive jack
Note: Tilt stand, fuse, and battery compartment are located on the rear of the unit
Symbols
•))) Continuity
Diode test
micro (amps)
m milli ( volts, amps)
k kilo (ohms)
 ohms
VDC volts direct current
VAC volts alternating current
ADC amps direct current
BAT Low battery
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4 MN24-en-US_V2.2 07/15
Operating Instructions
AC or DC Voltage Measurements
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive Vjack.
2. Turn the rotary switch to the VDC or VAC range needed.
3. Touch the test probes to the circuit under test and read the
voltage on the display.
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. Allow 15 minute cool-down after high current
measurements
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the;
a. Positive mA jack for currents to 200mA
b. Positive 10A jack for currents to 10A
2. Turn the rotary switch to the ADC range needed.
3. Touch the test probes in series with the circuit under
test and read the current on the display.
Resistance Measurements
1. Insert the black test lead banana plug into the negative COM jack and the
red test lead banana plug into the positive jack.
2. Turn the rotary switch to the range needed.
3. Touch the test probes to the circuit or device under test
and read the resistance on the display.
Continuity Measurements
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive jack.
2. Turn the rotary switch to the /•))) position.
3. Touch the test probes to the circuit or device under test. If the resistance is
less than approximately 30the buzzer will sound. Read the resistance on
the display.
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5 MN24-en-US_V2.2 07/15
Diode Measurements
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.
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 Vjack.
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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6 MN24-en-US_V2.2 07/15
Maintenance
WARNING: To avoid electrical shock, disconnect the test leads from any
source of voltage before removing the rear cover.
WARNING: To avoid electrical shock, do not operate this meter until the rear
cover is in place and fastened securely.
This Multimeter is designed to provide years of dependable service if the following
care instructions are observed.
1. Keep the meter dry.
2. Use and store the meter in mild ambient conditions. Temperature
extremes can shorten the life of the electronic parts and distort or melt
plastic parts.
3. Handle the meter gently. Dropping it can damage the electronic parts or
the case.
4. Keep the meter clean. Wipe the case occasionally with a damp cloth. DO
NOT use chemicals, cleaning solvents or detergents.
5. Use only fresh batteries of the recommended size and type. Remove old
or weak batteries so they do not leak and damage the unit.
6. If the meter is to be stored for a long period of time, the batteries should
be removed to prevent damage to the unit.
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7 MN24-en-US_V2.2 07/15
Battery Replacement
WARNING: To avoid electrical shock, disconnect the test leads from any
source of voltage before removing the rear cover.
1. Disconnect the test leads from the meter.
2. Remove the rubber holster (if in place)
3. Open the battery door by removing the screw with a
Phillips head screwdriver
4. Insert the new battery into the battery holder, ensuring
correct polarity
5. Replace the battery door and secure with the screw
Fuse Replacement
WARNING: To avoid electric shock, disconnect the test leads from any
source of voltage before removing rear cover.
1. Disconnect the test leads from any circuit being measured.
2. Remove the rubber holster (if in place)
3. Open the fuse cover by removing the screw with a Phillips head
screwdriver.
4. Remove the old fuse and Install the new fuse by gently pushing it into the
holder.
5. Always use a fuse of the proper size and value (0.2A/250V fast blow, or
10A/250V fast blow).
6. Replace the fuse cover and secure with the screw
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8 MN24-en-US_V2.2 07/15
Specifications
Function Range Resolution Accuracy
DC Voltage
(V DC)
200mV 0.1mV (0.5% reading + 2 digits)
2000mV 1mV
20V 0.01V
200V 0.1V
600V 1V
AC Voltage
(V AC)
200V 0.1V (1.2% reading + 10 digits
(50/60Hz)
600V 1V
DC Current
(A DC)
2000A 1A (1.0% reading + 2 digits)
20mA 10A
200mA 100A (1.2% reading + 2 digits)
10A 10mA (2.0% reading + 2 digits)
Resistance 2000.1(0.8% reading + 2 digits)
20001
20k0.01k
200k0.1k
2000k1k(1.0% reading + 2 digits)
Battery Test 9V 10mV (1.0% reading + 2 digits)
1.5V 10mV
Input Limits
Function Maximum Input
VAC 600VDC/VAC
VDC 600VDC, 600VAC, 200Vrms on 200mV range
Ohms, Continuity 220Vrms for 15sec max
mA DC 200mA, 250V fast acting fuse
10A DC 10A, 250V fast acting fuse
NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less than 75% RH.
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9 MN24-en-US_V2.2 07/15
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 approx 30
Battery Test current 9V (6mA); 1.5V (100mA)
Input Impedance >1M
ACV Bandwidth 45Hz to 450Hz
DCA voltage drop 200mV
Display 3 ½ digit, 2000 count LCD, 0.5” digits
Over range indication “1” is displayed
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 one 9 volt (NEDA 1604) battery
Fuses mA, A ranges; 0.2A/250V fast blow
A range; 10A/250V fast blow
Operating Temperature 32oF to 122oF (0oC to 50oC)
Storage Temperature -4oF to 140oF (-20oC to 60oC)
Relative Humidity <70% operating, <80% storage
Operating Altitude 7000ft. (2000) meters maximum.
Weight 9.17 oz. (260g).
Size 4.78” x 2.38” x 1.57” (121.5mm x 60.6mm x 40mm)
Approvals UL, CE
Safety For indoor use and in accordance with Overvoltage Category II 600V,
Pollution Degree 2. Category II includes local level, appliance, portable
equipment, etc., with transient overvoltages less than Overvoltage
Category III.
UL Listed The UL mark does not indicate that this product has been evaluated for
the accuracy of its readings.
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10 MN24-en-US_V2.2 07/15
Warranty
FLIRSystems,Inc.warrantsthisExtechInstrumentsbranddevice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forauthorization.Visit
thewebsitewww.extech.comforcontactinformation.AReturnAuthorization(RA)numbermustbeissuedbeforeanyproductis
returned.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.FLIRSystems,Inc.specificallydisclaimsanyimplied
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consequentialdamages.FLIR’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,Repair,andCustomerCareServices
FLIRSystems,Inc.offersrepairandcalibrationservicesfortheExtechInstrumentsproductswe
sell.NISTcertificationformostproductsisalsoprovided.CalltheCustomerServiceDepartmentfor
informationoncalibrationservicesavailableforthisproduct.Annualcalibrationsshouldbe
performedtoverifymeterperformanceandaccuracy.Technicalsupportandgeneralcustomer
serviceisalsoprovided,refertothecontactinformationprovidedbelow.
Copyright©2013‐2015FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform
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TechnicalSupport:Option3;E‐mail:[email protected]
Repair&Returns:Option4;E‐mail:[email protected]
Productspecificationsaresubjecttochangewithoutnotice
Pleasevisitourwebsiteforthemostup‐to‐dateinformation
www.extech.com
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