User Guide True RMS Multimeter Extech EX205T
Introduction Thank you for selecting the Extech EX205T True RMS Auto-ranging Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Diode Test, and Continuity. Proper use and care of this meter will provide many years of reliable service. Please visit the Extech Instruments website (www.extech.com) to check for the latest version of this User Guide. Extech Instruments is an ISO9001 certified company.
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 25 VAC rms or 35 VDC. These voltages are considered a shock hazard. Warning! This is a Class A device.
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 Maximum Input V AC/DC, Resistance, Diode Test, Continuity 600 VDC/AC rms μA or mA AC/DC 200mA fused A AC/DC 10A fused 2. USE EXTREME CAUTION when working with high voltages. 3.
Controls and Jacks 1. 2000 count LCD 2. MAX button 3. MODE button 4. FUNCTION switch 5. mA, µA and 10A input jacks 6. Backlight button 7. HOLD button 8. RANGE button 9. Positive input jack 10. COM input jack Note: Tilt stand, test lead holders, and battery compartment are on rear of unit.
Operating Instructions WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are extremely 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. AC/DC VOLTAGE MEASUREMENTS CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF.
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. Rotate the function switch to the Ω position. 2. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive jack. 3. Touch the test probe tips across the device under test. 4. Read the resistance in the display.
AUTORANGING/MANUAL RANGE SELECTION When the meter is first switched on, it automatically enters the Auto-Ranging mode. 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 button. The “AUTO” display indicator will turn off. 2. Press the RANGE key to step through the available ranges until the range desired is selected. 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 the 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 followed: 1. KEEP THE METER DRY. If it gets wet, wipe it off. 2. USE AND STORE THE METER IN NORMAL TEMPERATURES.
Specifications Function Range Resolution DC Voltage 200 mV 0.1 mV 2V 0.001V 20V 0.01V 200V 0.1V 600V 1V AC Voltage 200 mV 0.1 mV 50/60Hz 2V 0.001V 20V 0.01V 200V 0.1V 600V 1V Accuracy (0.8% reading + 6 digits) (0.5% reading + 2 digits) (0.8% reading + 2 digits) (1.5% reading + 6 digits) All AC voltage ranges are specified from 5% of range to 100% of range DC Current 200 A 0.1 A 2000 A 1 A 20 mA 0.01 mA 200 mA 0.1 mA 2.000 0.001 A 10 A 0.01 A (1.
Enclosure Double molded Diode Test Test current of 0.9mA maximum, open circuit voltage 2.8V DC typical Continuity Threshold 20 to 50, test current <1.
