User's Guide True RMS Industrial Multimeter Extech EX520
Introduction Congratulations on your purchase of the Extech EX520 True RMS Autoranging Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency (electrical & electronic), Diode Test, and Continuity plus Thermocouple Temperature. It features a rugged design for heavy duty use. Proper use and care of this meter will provide many years of reliable service.
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. • Warning! This is a class A equipment.
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.
Controls and Jacks 1. 6,000 count LCD 2. RANGE button 3. Hz and % button 4. Mode button 5. Function switch 6. mA, µA and 10A input jacks 7. COM input jack 8. Positive input jack 9. HOLD and Backlight button 10. RELATIVE button 11. MAX/MIN button Note: Tilt stand and battery compartment are on rear of unit.
Operating Instructions WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care. 1. ALWAYS turn the function switch to the OFF position when the meter is not in use. 2. If “OL” appears in the display during a measurement, the value exceeds the range you have selected. Change to a higher range. DC VOLTAGE MEASUREMENTS CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF.
DC CURRENT MEASUREMENTS CAUTION: Do not make 20A current measurements for longer than 30 seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads. 1. Insert black test lead banana plug into the negative COM jack. 2. For current measurements up to 6000µA DC, set the function switch to the yellow µA position and insert the red test lead banana plug into the µA/mA jack. 3.
RESISTANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords. 1. Set the function switch to the green Ω CAP position. 2. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive Ω jack. 3. Press the MODE button to indicate “Ω" on the display. 4.
TEMPERATURE MEASUREMENTS 1. Set the function switch to the green Temp position. 2. Insert the Temperature Probe into the input jacks, making sure to observe the correct polarity. 3. Press the MODE button to indicate ºF or ºC 4. Touch the Temperature Probe head to the part whose temperature you wish to measure. Keep the probe touching the part under test until the reading stabilizes (about 30 seconds). 5. Read the temperature in the display. Note: The temperature probe is fitted with a type K mini connector.
AUTORANGING/MANUAL RANGE SELECTION When the meter is first turned on, it automatically goes into Autoranging. This automatically selects the best range for the measurements being made and is generally the best mode for most measurements. For measurement situations requiring that a range be manually selected, perform the following: 1. Press the RANGE key. The “AUTO” display indicator will turn off. 2.Press the RANGE key to step through available ranges until you select the desired range. 3.
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. KEEP THE METER DRY. If it gets wet, wipe it off. 2. USE AND STORE THE METER IN NORMAL TEMPERATURES.
WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and fastened securely. NOTE: If your meter does not work properly, check the fuses and batteries to make sure that they are still good and that they are properly inserted. A B A B A F1 F2 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.
Specifications Function DC Voltage Range 600mV 6V 60V 600V 1000V Resolution 0.1mV 0.001V 0.01V 0.1V 1V Accuracy ±(0.09% reading + 2 digits) AC Voltage 50 to 60Hz 40Hz to 1KHz 6V 0.001V 60V 0.01V ±(1.0% reading + 3 dgts) ±(2.0% reading + 3 dgts) 600V 0.1V 1000V 1V All AC voltage ranges are specified from 5% of range to 100% of range DC Current 600μA AC Current 6000μA 1μA 60mA 0.01mA ±(1.0% reading + 3 digits) 600mA 0.1mA 6A 0.001A 10A 0.
Function Resistance Capacitance Frequency (electronic) Range Resolution 600Ω 0.1Ω 6kΩ 0.001kΩ 60kΩ 0.01kΩ 600kΩ 0.1kΩ Accuracy ±(0.3% reading + 4 digits) 6MΩ 0.001MΩ 40MΩ 60nF 600nF 0.01MΩ 0.01nF 0.1nF ±(0.3% reading + 20 digits) 6μF 0.001μF ±(3.5% reading + 4 digits) 60μF 0.01μF 600μF 0.1μF 1000μF 9.999Hz 99.99Hz 999.9Hz 9.999kHz 99.99kHz 999.9kHz 9.999MHz 40MHz 1μF 0.001Hz 0.01Hz 0.1Hz 0.001kHz 0.01kHz 0.1kHz 0.001MHz 0.01MHz ±(5% reading + 5 digits) ±(0.
Enclosure Double molded, waterproof (IP67) Shock (Drop Test) 6.5 feet (2 meters) Diode Test Test current of 0.9mA maximum, open circuit voltage 2.8V DC typical Continuity Check Audible signal will sound if the resistance is less than 100Ω (approx.), test current <0.35mA Temperature Sensor Requires type K thermocouple Input Impedance >10MΩ VDC & >10MΩ VAC AC Response True rms ACV Bandwidth 40Hz to 1kHz Crest Factor ≤3 at full scale up to 500V, decreasing linearly to ≤1.
