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Introduction Congratulations on your purchase of the Extech EX510 Autoranging Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Frequency (electrical & electronic), Diode Test, and Continuity. It features a rugged design for heavy duty use. Proper use and care of this meter will provide many years of reliable service.
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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.
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. NEVER apply voltage or current to the meter that exceeds the specified maximum: Input Protection Limits Function Maximum Input...
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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.
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.
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.
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.
FREQUENCY/DUTY CYCLE MEASUREMENTS (ELECTRONIC) 1. Set the rotary function switch to the green “Hz %” position. 2. Press the Hz/% button to indicate “Hz” in the display. 3. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack.
DISPLAY BACKLIGHT Press the HOLD key for >1 second to turn on or off the display backlight function. The backlight will automatically turn off after 10 seconds. HOLD The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or to exit the HOLD function.
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.
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. F1 F2 REPLACING THE FUSES WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before...
Specifications Function Range Resolution Accuracy DC Voltage 600mV 0.1mV 0.001V ±(0.09% reading + 2 digits) 0.01V 600V 0.1V 1000V AC Voltage 50 to 60Hz 40Hz to 1KHz 0.001V 0.01V ±(1.0% reading + 3 dgts) ±(2.0% reading + 3 dgts) 600V 0.1V 1000V All AC voltage ranges are specified from 5% of range to 100% of range...
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