USER MANUAL
MiniTecTM Series
Manual Ranging Mini MultiMeter
Model MN35
Additional User Manual Translations available at www.extech.com
Introduction
Congratulations on your purchase of Extech’s MN35 Manual Ranging Multimeter. This meter
measures AC/DC Voltage, DC Current, Resistance, Temperature, Battery Test, Diode Test and
Continuity. This meter is shipped fully tested and calibrated and, with proper use, will provide
years of reliable service. Please visit our website (www.extech.com) to check for the latest version
of this User Guide, Product Updates, and Customer Support.
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 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 ured.
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. To avoid electric shock, do not measure AC current of any kind
Input Limits
Function
Maximum Input
VDC, VAC
600V DC/AC
Resistance, Diode, Continuity
500V DC/AC
mA DC
250mA DC
10A DC
10A DC (15sec. max every 15 min.)
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Meter Description
1. LCD Display
2. Hold button
3. Function switch
4. COM jack
5. 10A jack
6. Positive jack
Note: Tilt stand and battery
access is on the rear of unit.
Operating Instructions
Note: If “H” and a blank screen appear when the meter is turned on the HOLD feature is active.
Press the HOLD button to exit the HOLD mode.
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 V jack.
2. Turn the rotary switch to the highest VAC or VDC position.
3. Touch the test probes to the circuit under test and read the voltage on the display.
4. Reset the function switch to successively lower positions to obtain a higher resolution reading. If
the polarity is reversed (DC voltage only), the display will show (-) minus before the value.
DC Current Measurements
CAUTION: Do not make current measurements on the 10A scale for longer than 15 seconds
followed by a 15 minute cool down period. Exceeding 15 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 200mA DC position
and insert the red test lead banana plug into the V/Ω/mA jack.
3. For current measurements up to 10A DC, set the function switch to the 10A DC 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.
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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 V/Ω/mA jack.
2. Set the function switch to the highest position.
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 position that is
greater than the actual or any anticipated resistance.
Temperature Measurements
WARNING: To avoid electric shock, disconnect test leads from any source of voltage before
making a temperature measurement. Be sure that the thermocouple has been removed before
changing to any other measurement function.
1. Insert the type K thermocouple probe into the V/Ω/mA and COM jacks.
2. Turn the rotary switch to the oF or oC position.
3. Read the temperature 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 V/Ω/mA jack. Observe polarity.
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 40Ω the buzzer will sound.
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 V/Ω/mA jack.
2. Turn the rotary switch to the
•))) position.
3. Touch the test probes to the diode under test. Forward voltage will indicate 0.4V to 0.7V.
Reverse voltage will indicate “1. ”. Shorted devices will indicate near 0mV and an open device
will indicate “1. ” 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 V jack.
2. Turn the rotary switch to the 1.5V or 9V BAT position.
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
Data Hold
Press the Hold button to freeze the reading in the display. “H” will appear in the LCD. Press the
key again to release the display.
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Maintenance
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage
before removing the battery/fuse cover.
WARNING: To avoid electric shock, do not operate your meter until the battery/fuse cover is in
place and fastened securely.
This Multimeter is designed to provide years of dependable service, if the following care
instructions are performed.
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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Battery Replacement
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage
before removing the battery/fuse cover.
1. Disconnect the test leads from the meter.
2. Remove the rubber holster (if in place).
3. Remove the two screws securing the rear cover using a Phillips head screwdriver.
4. Lift the cover off and replace the battery observing the correct polarity.
5. Insert the new battery into the battery holder.
6. Replace the rear cover and secure with the screws.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate
collection sites, the retail store where the batteries were purchased, or wherever
batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is
obligated to take end-of-life devices to a designated collection point for the disposal
of electrical and electronic equipment.
Other Battery Safety Reminders
o Never dispose of batteries in a fire. Batteries may explode or leak.
o Never mix battery types. Always install new batteries of the same type.
Fuse Replacement
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage
before removing battery/fuse cover.
1. Disconnect the test leads from any circuit being measured.
2. Remove the rubber holster (if in place).
3. Remove the two screws securing the rear cover using a Phillips head screwdriver. Remove the
rear cover.
4. Remove the old fuse by gently pulling up on it.
5. Install the new fuse by gently pushing it into the holder.
6. Always use a fuse of the proper size and value; 250mA/250V fast blow.
7. Replace the rear cover and secure with the screws.
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Specifications
Function
DC Voltage (V DC)
AC Voltage (V AC)
(40 - 400Hz)
DC Current (A DC)
Resistance
Range
200.0mV
2.000V
20.00V
200.0V
600V
200.0V
600V
200.0mA
Accuracy
±(0.5% reading + 2 digits)
±(0.8% reading + 2 digits)
±(1.2% reading + 10 digits)
±(1.5% reading + 2 digits)
10.00A
±(3.0% reading + 5 digits)
200.0Ω
±(0.8% reading + 4 digits)
2.000kΩ
20.00kΩ
±(0.8% reading + 2 digits)
200.0kΩ
Temp °F
20.00MΩ
±(3.0% reading + 3 digits)
-4 to 1400°F
-4 to 59°F; ±(2.5% reading + 19 digits)
60 to 750°F ±(1.0% reading + 9 digits)
751; to 1400°F; ±(2.5% reading + 19 digits)
-20 to 16°C; ±(2.5% reading + 10 digits)
17 to 400°C; ±(1.0% reading + 5 digits),
400 to 750°C; ±(2.5% reading + 10 digits)
(probe accuracy not included)
o
o
o
Accuracy
Stated at 23 C ±5 C (73 F ±10oF) and less than 70% RH
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 <40Ω ± 5Ω
Temperature sensor
Requires type K thermocouple
Input Impedance 10MΩ (VDC) and 4.5MΩ (VAC)
Display
1999 count LCD
Overrange
“1 or -1” is displayed
Polarity
Automatic (no indication for positive polarity); Minus (-) sign for negative
polarity.
Measurement Rate3 times per second, nominal
Low Battery
“
” is displayed if battery voltage drops below operating voltage
Batteries
Requires one 9V battery (NEDA 1604 or equivalent)
Fuses
mA range; 250mA/250V fast blow
10A range, no protection
Operating Temp 0oC to 40oC (32oF to 104oF)
Storage Temp -20oC to 60oC (-4oF to 140oF)
Temp °C
-20 to 750°C
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Relative HumidityMaximum relative humidity 80% for temperatures up to 31°C decreasing linearly
to 50% relative humidity at 40°C.
Operating Altitude 2000 meters (7000ft) maximum.
Weight
153g (5.4 oz.)
Size
138mm x 72mm x 38mm (5.43” x 2.83” x 1.5”)
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.
Symbols
AC (voltage)
DC (direct current or voltage)
•)))
Continuity and Diode test
mV, V
millivolt, volt (voltage)
kM ohm, kilohm, megohm (resistance)
µA, mA, A
microamp, milliamp, Amp (current)
ºF, ºC
Degrees Fahrenheit, centigrade (temperature)
º
Low battery
HOLD
Display hold
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All rights reserved including the right of reproduction in whole or in part in any form
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