User's Guide Mini Multimeter with Non-Contact Voltage Detector (NCV) Model EX310
Introduction Congratulations on your purchase of the Extech EX310 MultiMeter. The EX310 offers AC/DC Voltage, AC/DC Current, Resistance, Diode, and Continuity testing plus a built-in non-contact Voltage Detector. Proper use and care of this meter will provide many years of reliable service. Safety 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.
SAFETY INSTRUCTIONS 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 Protection Limits Function V DC or V AC Maximum Input 600V AC and DC mA AC/DC 200mA DC/AC A AC/DC 10A DC/AC (for 30 seconds max. every 15 mins.) Resistance, Diode Test, Continuity 250V DC/AC 2. 3. 4. 5. 6. 7. 8.
CAUTIONS • Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter. • Always remove the test leads before replacing the battery or fuses. • Inspect the condition of the test leads and the meter itself for any damage before operating the meter. • Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard.
Controls and Jacks 1. AC Voltage Detector Sensor 2. AC Voltage Detector indicator light 3. LCD 4. Non-contact AC Voltage Detector test button 5. Rotary function dial 1 2 9 3 4 6. 10 ampere test lead jack 7. COM test lead jack 8. Test lead jack for voltage, milliamp, resistance/continuity, and diode functions 9.
Operating Instructions WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care. NOTE: On some low AC and DC voltage ranges, with the test leads not connected to a device, the display may show a random, changing reading. This is normal and is caused by the high-input sensitivity. The reading will stabilize and give a proper measurement when connected to a circuit.
AC VOLTAGE MEASUREMENTS WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present. CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF.
BATTERY VOLTAGE TEST CAUTION: Do not measure batteries while they are installed in the devices they are powering. The batteries must be removed from installations before tests can be made. 1. 2. 3. 4. Set the function switch to the 1.5V or 9V BAT switch position. Use the 1.5V position for ‘AAA’, ‘AA’, ‘C’, ‘D’, and other 1.5V batteries. Use the 9V position for square 9V transistor batteries. Insert the black test lead banana plug into the negative COM jack.
RESISTANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. 1. 2. 3. 4. 5. Set the function switch to the highest Ω position. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive Ω jack. Touch the test probe tips across the circuit or part under test.
DIODE TEST 1. 2. 3. 4. 5. Set the function switch to the position. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive jack. Touch the test probes to the diode under test. A good diode will indicate approx. 700 ohms for the forward test and “1___” for the reverse test. A shorted diode will indicate the same value of resistance in both the reverse and forward test directions. An open diode will indicate “1___” in both test directions.
Maintenance WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the back cover or the battery or fuse covers. WARNING: To avoid electric shock, do not operate your meter until the battery and fuse covers are in place and fastened securely. This MultiMeter is designed to provide years of dependable service, if the following care instructions are performed: 1. 2. 3. 4. 5. 6. KEEP THE METER DRY. If it gets wet, wipe it off.
BATTERY INSTALLATION and LOW BATTERY INDICATION WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery cover. Do not operate meter unless the battery is in place. LOW BATTERY INDICATION The icon will appear in the lower left-hand corner of the display when the battery voltage becomes low. Replace the batteries when this appears. BATTERY REPLACEMENT 1. Disconnect the test leads from the meter. 2. Remove the protective rubber holster. See diagram.
2 1 5 3 4 1. 6 Removable Rubber Holster 2. Meter 3. Battery 4. Fuses 5. Compartment Cover 6. Rubber Holster REPLACING THE FUSES WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the fuse cover. 1. Disconnect the test leads from the meter. 2. Remove the protective rubber holster. 3. Remove the Phillips head screw located on the lower back of the instrument. 4. Remove the fuse/battery compartment cover to access the fuses. 5.
Range Specifications Function Range Resolution Non-contact AC Voltage detector 100 to 600V Resolution & accuracy do not apply since the meter does not display the voltage in this mode. The lamp at the top of the meter’s display flashes when voltage is sensed and an audible warning will sound DC Voltage 200mV 0.1mV (V DC) 2000mV 1mV 20V 0.01V 200V 0.1V Accuracy ±(0.5% reading + 2 digits) ±(1.0% reading + 2 digits) 600V 1V ±(1.5% reading + 2 digits) AC Voltage (VAC) 50/60Hz 200V 0.
General Specifications Diode Test Continuity Check Input Impedance AC Bandwidth Display Overrange indication Polarity Measurement Rate Low Battery Indication Battery Fuses Operating Temperature Storage Temperature Operating Humidity Storage Humidity Operating Altitude Weight Size Approvals Safety Section 1.01 Bias voltage: 2.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE CATEGORY I Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level. Note – Examples include protected electronic circuits. OVERVOLTAGE CATEGORY II Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation. Note – Examples include household, office, and laboratory appliances.
