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Summary of Contents for Extech Instruments EX540-NIST
- Page 1 User Manual Wireless TRMS Multimeter Model EX540 Additional User Manual Translations available at www.extech.com ...
- Page 2 Introduction This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency (electrical & electronic), Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature. It can store and recall data. It features a waterproof, rugged design for heavy duty use. This meter can transmit data wirelessly when linked to a PC.
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Page 3: Safety Instructions
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... - Page 4 Controls and Jacks 1. 40,000 count LCD display 2. STORE(<RECALL) button 3. MAX/MIN (-) button 4. MODE button 5. RANGE(SETUP) button 6. Function switch 7. mA, µA and 10A input jacks 8. COM input jack 9. Positive input jack Backlight button 11.
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Page 5: Dc Voltage Measurements
Operating Instructions WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care. ALWAYS turn the function switch to the OFF position when the meter is not in use. If “OL” appears in the display during a measurement, the value exceeds the range you have selected. -
Page 6: Mv Voltage Measurements
mV VOLTAGE MEASUREMENTS CAUTION: Do not measure mV voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter. Set the function switch to the mV position. Press the MODE button to indicate “DC” or “AC”, or in AC range press EXIT for two seconds and chose ”AC+DC”... -
Page 7: Ac Current (Frequency, Duty Cycle) Measurements
AC CURRENT (FREQUENCY, DUTY CYCLE) 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. Insert the black test lead banana plug into the negative COM jack. For current measurements up to 4000µA AC, set the function switch to the µA position and insert the red test lead banana plug into the µA/mA jack. -
Page 8: Continuity Check
CONTINUITY CHECK WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage on them. Set the function switch to the Ω CAP position. Insert the black lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive jack. Press the MODE button to indicate“... -
Page 9: Temperature Measurements
TEMPERATURE MEASUREMENTS Set the function switch to the Temp position. Insert the Temperature Probe into the input jacks, making sure to observe the correct polarity. Press the MODE button to indicate “ºF” or “ºC” Touch the Temperature Probe head to the part whose temperature you wish to measure. -
Page 10: Relative Mode
RELATIVE MODE The relative measurement feature allows you to make measurements relative to a stored reference value. A reference voltage, current, etc. can be stored and measurements made in comparison to that value. The displayed value is the difference between the reference value and the measured value. -
Page 11: Clearing Memory
DATA STORAGE RECALL Press STORE button for two seconds to enter into RECALL function. On the left upper aux display will show XXXX, which is the current storage location. The right aux display will show XXXX, which is the number of storage locations currently used. Press the + or —... -
Page 12: Maintenance
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. -
Page 13: Battery Installation
BATTERY INSTALLATION WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery cover. 1. Turn power off and disconnect the test leads from the meter. 2. Open the rear battery cover by removing two screws (B) using a Phillips head screwdriver. 3. -
Page 14: Replacing The Fuses
REPLACING THE FUSES WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the meter cover. 1. Disconnect the test leads from the meter. 2. Remove the protective rubber holster. 3. Remove the battery cover (two “B” screws) and the battery. 4. -
Page 15: Specifications
Specifications Function Range Resolution Accuracy DC Voltage 400mV 0.01mV 0.0001V (0.06% reading + 2 digits) 0.001V 400V 0.01V (0.1% reading + 2 digits) 1000V 0.1V AC Voltage 400mV 0.01mV (1.0% reading + 4digits) (AC+DC) 0.0001V 50 to 1000Hz 0.001V (1.0% reading + 3digits) 400V 0.01V 1000V... - Page 16 Function Range Resolution Accuracy Resistance (0.3% reading + 9 digits) 400 0.01 4k 0.0001k 40k 0.001k (0.3% reading + 4 digits) 400k 0.01k 4M 0.001M (2.0% reading + 10 digits) 40M 0.001M Capacitance 40nF 0.001nF (3.5% reading + 40 digits) 400nF 0.01nF 4F...
- Page 17 Enclosure Double molded, waterproof (IP67) Shock (Drop Test) 2 meters (6.5 feet) Diode Test Test current of 0.9mA maximum, open circuit voltage 2.8V DC typical Storage capacity 9999 records RF transmit distance 10 meters (approx) Transmitter Frequency 915MHz Continuity Check Audible signal will sound if the resistance is less than 35...
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