User’s Manual MiniTecTM Series Model MN35 Manual Ranging Mini MultiMeter 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. Proper use and care of this meter will provide many years of reliable service. 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 for contact information. 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. Copyright © 2004 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 2 MN35 V2.0 2/05 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 on any circuit whose voltage exceeds 250V AC. Function VDC, VAC Resistance, Diode, Continuity mA DC 10A DC Input Limits Maximum Input 600V DC/AC 500V DC/AC 250mA DC 10A DC (15sec. max every 15 min.) 3 MN35 V2.0 2/05 Specifications Function Range Accuracy DC Voltage (V DC) 200.0mV 2.000V 20.00V 200.0V 600V AC Voltage (V AC) 200.0V (40 - 400Hz) 600V DC Current (A DC) 200.0mA Resistance ±(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 20.00MΩ ±(3.0% reading + 3 digits) Temp °F -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) Temp °C -20 to 750°C -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) Accuracy Stated at 73oF ±10oF (23oC ±5 oC) and less than 70% RH Test current of 1mA maximum, open circuit voltage 2.8V DC typical Diode Test 4 MN35 V2.0 2/05 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 Rate 3 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 32oF to 104oF (0oC to 40oC) Storage Temp -4oF to 140oF (-20oC to 60oC) Relative Humidity Maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to 50% relative humidity at 40°C. Operating Altitude 7000ft (2000 meters) maximum. Weight 5.4 oz. (153g). Size 5.43” x 2.83” x 1.5” (138mm x 72mm x 38mm) 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 •))) mV, V Ω, kΩ, MΩ µA, mA, A º F, ºC º HOLD AC (voltage) DC (direct current or voltage) Continuity and Diode test millivolt, volt (voltage) ohm, kilohm, megohm (resistance) microamp, milliamp, Amp (current) Degrees fahrenheit, centigrade (temperature) Low battery Display hold 5 MN35 V2.0 2/05 Meter Description 1. 2. 3. 4. 5. 6. LCD Display Hold button Function switch COM jack 10A jack 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. 6 MN35 V2.0 2/05 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. 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 Ω 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 Ω position that is greater than the actual or any anticipated resistance. 7 MN35 V2.0 2/05 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 8 MN35 V2.0 2/05 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. 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 3. 4. 5. 6. extremes can shorten the life of the electronic parts and distort or melt plastic parts. Handle the meter gently. Dropping it can damage the electronic parts or the case. Keep the meter clean. Wipe the case occasionally with a damp cloth. DO NOT use chemicals, cleaning solvents or detergents. Use only fresh batteries of the recommended size and type. Remove old or weak batteries so they do not leak and damage the unit. If the meter is to be stored for a long period of time, the batteries should be removed to prevent damage to the unit. 9 MN35 V2.0 2/05 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. 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. 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 10 MN35 V2.0 2/05