User’s Manual
MiniTec
TM
Series
Model MN26
(Model MN26T includes temperature probe)
Mini Autoranging MultiMeter
Introduction
Congratulations on your purchase of Extech’s MN26 Autoranging Multimeter. 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.
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 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 Capacitance, 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 on any circuit whose voltage exceeds 250V AC.
10. 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".
Specifications
DC Voltage
(V DC)
400mV 0.1mV
±(0.5% reading + 2 digits)
AC Voltage
(V AC)
(40 - 400Hz)
(40 - 200Hz for
400mV, 4V ranges)
DC Current
(A DC)
40V 0.01V
400V 0.1V
600V 1V
±(1.5% reading + 2 digits)
400mV 0.1mV
±(2.0% reading + 30 digits)
4V 0.001V
40V 0.01V
400V 0.1V
600V 1V
±(2.0% reading + 4 digits)
400
µA 0.1µA ±(1.5% reading + 3 digits)
4000
µA 1µA
40mA 0.01mA
400mA 0.1mA
2 MN26T V4.0 05/05
AC Current
(A AC)
(40 - 400Hz)
(40 - 200Hz for
400
µA, 4mA ranges)
Resistance
400
µA 0.1µA
4000
µA 1µA
±(1.8% reading + 5 digits)
40mA 0.01mA
400mA 0.1mA
Capacitance
Frequency
Duty Cycle
Temp
°F
Temp
°C
400
Ω 0.1Ω
4k
Ω 0.001kΩ
40k
Ω 0.01kΩ
400k
Ω 0.1kΩ
±(1.2% reading + 4 digits)
±(1.2% reading + 2 digits)
4M
Ω 0.001MΩ
40M
Ω 0.01MΩ
400nF 0.1nF
4
µF 0.001µF
±(2.0% reading + 3 digits)
±(5.0% reading + 10digits)
40nF 0.01nF
±(3.5% reading + 5 digits)
40
µF 0.01µF
200
µF 0.1µF
9.999Hz 0.001Hz
±(5.0% reading + 5 digits)
±(1.5% reading + 5 digits)
99.99Hz 0.01Hz
999.9Hz 0.1Hz
±(1.2% reading + 2 digits)
9.999kHz 0.001kHz
99.99kHz 0.01kHz
999.9kHz 0.1kHz
9.999MHz 0.001MHz
±(1.5% reading + 4 digits)
Sensitivity: 0.8V rms min. @ 20% to 80% duty cycle and <100kHz;
5Vrms min @ 20% to 80% duty cycle and > 100kHz.
0.1 to 99.9%
-4 to 1400
-20 to 760
0.1%
°F* 1°F
°C* 1°C
±(1.2% reading + 2 digits)
Pulse width: 100
µs - 100ms
±(3.0% reading + 3 digits)
(probe effect additional)
NOTE: Accuracy is stated at 65 o
F to 83 o
F (18 o
C to 28 o
C) and less than 70% RH.
NOTE: Temperature range of the temperature probe may be less than the range of the meter.
Input Limits
V DC, VAC
Ohms, Capacitance, Diode, Frequency,
Continuity mA DC/AC
10A DC/AC
600V DC/AC
250V DC/AC
400mA DC/AC
10A DC/AC (30sec. max)
3 MN26T V4.0 05/05
Diode Test Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical
Continuity Check Audible signal will sound if the resistance is less than approximately 30
Ω, test current <0.7mA
Input Impedance 7.5M
Ω (VDC and VAC)
Display
4000 count LCD
Overrange indication
Polarity
“OL” is displayed
Automatic (no indication for positive polarity); Minus (-) sign for
Measurement Rate
Auto Power Off
Low Battery Indication
negative polarity.
2 times per second, nominal
Meter automatically shuts down after 15 minutes of inactivity
“BAT” is displayed
Batteries
Fuses
Requires two AAA batteries mA,
µA ranges, 0.5A/250V fast blow
10A range, 10A/250V fast blow
Operating Temperature 32 o
Storage Temperature -4 o
F to 122
F to 140 o o
F (0 o
C to 50
F (-20 o o
C)
C to 60 o
C)
Relative Humidity
Operating Altitude
Weight
Size
Safety
<70% operating, <80% storage
7000ft (2000 meters) maximum.
9.17 oz. (260g).
4.78” x 2.38” x 1.57” (121.5mm x 60.6mm x 40mm)
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.
Meter Description
1
4
3
2
10. Data Hold key
5
6
7
Note: Tilt stand, fuse and battery compartment are on rear of unit.
10
9
8
4 MN26T V4.0 05/05
Symbols
•)))
AC (alternating current or voltage)
DC (direct current or voltage)
Continuity
pF, nF, uF
Hz kHz
%
O
F,
O picofarad, nanofarad, microfarad (capacitance) hertz, kilohertz (frequency)
% duty cycle
mV, V millivolt, volt (voltage)
Ω, kΩ, MΩ ohm, kilohm, megohm
(resistance)
uA, mA, A microamp, milliamp, Amp
(current)
Operating Instructions
AUTO
BAT
HOLD
REL
Centigrade (temperature)
Autorange
Low battery
Display hold
Relative
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 VAC or VDC position.
3. Touch the test probes to the circuit under test and read the voltage on the display.
AC or DC Current Measurements
CAUTION: Do not make current measurements on the 10A scale for longer than 30 seconds followed by a 15 minute cool down period. 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 and the red test lead banana plug into the; a. Positive uA/mA jack for currents to 400mA b. Positive 10A jack for currents to 10A
2. Turn the rotary switch to the uA, mA or A position.
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
Ω jack.
2. Turn the rotary switch to the
Ω position.
3. Touch the test probes to the circuit or device under test and read the resistance on the display.
5 MN26T V4.0 05/05
Capacitance Measurements
1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive CAP jack.
2. Turn the rotary switch to the CAP position.
3. Touch the test probes to the circuit or device under test and read the capacitance on the display.
Frequency or Duty Cycle Measurements
1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive HZ jack.
2. Turn the rotary switch to the Hz/% position.
4. Touch the test probes to the circuit or under test and read the frequency or duty cycle on the display.
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.
WARNING: To avoid electric shock, do not probe live circuits with the thermocouple probe..
1. Insert the type K thermocouple probe into the sub-miniature temperature socket.
(see separate instruction sheet at the end of this manual)
2. Turn the rotary switch to the
o
C or
o
F position.
3. Read the temperature on the display.
Note: Although the meter specifies the temperature range to be -4 to 1400 o
F (-20 to 760 o
C) the supplied thermocouple’s (Part No. TP870) temperature range is -40 to 482 o
F (-4- to
250 o
C).
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
Ω jack. Observe polarity.
2. Turn the rotary switch to the •))) position.
3. Press the •))) key to select continuity.
4. Touch the test probes to the circuit or device under test. If the resistance is less than approximately 30
Ω the buzzer will sound and the resistance appears on the display.
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. Press the •))) key to select diode.
4. Touch the test probes to the diode under test. Forward voltage will indicate 0.4V to
0.7V. Reverse voltage will indicate “OL”. Shorted devices will indicate near 0mV and an open device will indicate “OL” in both polarities.
6 MN26T V4.0 05/05
Manual Ranging
The meter powers on in the autoranging mode. Press the Range key to go to manual ranging. Each press of the range key will step to the next range as indicated by the units and decimal point location. Press and hold the Range key for one second to return to autoranging.
Data Hold
Press the Data Hold key to freeze the reading in the display. “HOLD” will appear in the
LCD. Press the key again to release the display.
Relative Measurements
The relative measurement feature allows you to make measurements relative to a stored reference value. A reference voltage, current, etc. can be stored and measurements made in comparison to that value. The displayed value is the difference between the reference value and the measured value.
1. Perform any measurement as described in the operating instructions. will appear on the display.
3. The display will now indicate the difference between the stored value and the measured value.
Auto Off
The auto off feature will turn the meter off after 15 minutes of inactivity (Range switch or a key has not been turned or pressed). A beep will warn the user shortly before the auto off feature activates.
7 MN26T V4.0 05/05
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.
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. Open the battery door by removing the screw using a Phillips head screwdriver.
4. Insert the new batteries into the battery holder, observing the 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 battery/fuse 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 on the rear cover using a Phillips screwdriver.
4. Remove the rear cover.
5. Remove the old fuse by gently pulling up on it.
6. Install the new fuse by gently pushing it into the holder.
7. Always use a fuse of the proper size and value (0.5A/250V fast blow, or 10A/250V fast blow).
8. Replace the fuse door and secure with the screw.
A UL mark does not indicate that this product has been evaluated for the accuracy of its readings.
8 MN26T V4.0 05/05
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 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.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell. 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.
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
Copyright © 2005 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
9 MN26T V4.0 05/05
Instruction Sheet
Model TP870
Type K Bead Wire Thermocouple Probe
WARNING: To avoid electric shock, do not probe into or near live electrical circuits with the thermocouple probe..
Sensor Type
Temperature range
Lead length
Connector
Type K thermocouple (Chromel – Alumnel)
-40 to 482 o
39” (1m)
Note: This probe is not UL listed
F (-40 to 250 o subminiature
C)
more infor for Extech MN26T
Phone: 01235 838 555
Web. www.airconcern.co.uk
Air Concern Ltd, Building 173 Curie Avenue Harvell Didcot, Oxfordshire
