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ENGLISH
INSTRUCTION MANUAL
Auto-Ranging
Digital Multimeter
True RMS
True RMS
Measurement
Technology
• LEAD ALERT
PROTECTION
• DATA HOLD
• AUDIBLE
CONTINUITY
• MIN / MAX
• TEMPERATURE
• DIODE TEST
• CAPACITANCE
600V
10A
50M
2 m
GlobalTestSupply
www.
MM420
5000573
CAT III
600V
.com
sales@GlobalTestSupply.com
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Table of Contents
Related Manuals for Klein Tools MM420
Summary of Contents for Klein Tools MM420
- Page 1 MM420 ENGLISH INSTRUCTION MANUAL Auto-Ranging Digital Multimeter True RMS True RMS Measurement Technology • LEAD ALERT PROTECTION • DATA HOLD • AUDIBLE CONTINUITY • MIN / MAX • TEMPERATURE • DIODE TEST • CAPACITANCE 600V 5000573 CAT III 600V GlobalTestSupply www.
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Page 2: General Specifications
ENGLISH GENERAL SPECIFICATIONS Klein Tools MM420 is an auto-ranging, true root mean squared multimeter that measures AC/DC voltage, AC/DC current, and resistance. It can also measure temperature, capacitance, frequency, duty-cycle, and test diodes and continuity. • Environment: Indoor. DO NOT expose to moisture, rain, or snow. - Page 3 ELECTRICAL SPECIFICATIONS VOLTAGE (AUTO-RANGING) Function Range Resolution Accuracy 4.000V AC Voltage 40.00V 10mV ±(1.0% + 3 digits) (V AC) 400.0V 100mV 600V ±(1.2% + 5 digits) 400.0mV 0.1mV 4.000V ±(0.5% + 5 digits) DC Voltage 40.00V 10mV (V DC) 400.0V 100mV ±(0.8% + 3 digits) 600V...
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Page 4: Duty Cycle
ENGLISH ELECTRICAL SPECIFICATIONS CAPACITANCE (AUTO-RANGING) Range Resolution Accuracy 40.00nF 10pF ±(3.5% + 10 digits) 400.0nF 0.1nF 4.000 F ±(3.0% + 5 digits) 40.00 F 10nF 400.0 F 0.1 F ±(3.5% + 5 digits) Maximum Input: 600V DC or 600V AC RMS FREQUENCY (AUTO-RANGING) 9.999Hz 0.001Hz... -
Page 5: Electrical Specifications
ELECTRICAL SPECIFICATIONS • Diode Test: 1.8 mA max, open circuit voltage 3.9V DC • Continuity Check: Audible signal <50Ω • Sampling Frequency: 3 samples per second • Overload: "OL" indicated on display, overload protection 600V RMS in all settings • Polarity: "-" on display indicates negative polarity •... -
Page 6: Symbols On Meter
ENGLISH SYMBOLS ON METER AC/DC Voltage or Current Resistance (in Ohms) Audible Continuity Diode Capacitance Frequency Duty-cycle Double Insulated Class II °F/°C Temperature (Fahrenheit / Celsius) Ground Fuse (with rating below symbol) Backlight Warning or Caution Read Instructions To ensure safe operation and service of this meter, follow all warnings and instructions detailed in this manual. -
Page 7: Feature Details
FEATURE DETAILS NOTE: There are no user-serviceable parts inside meter. 4000 count LCD display "RANGE" button Function selector switch "MAX/MIN" button "10A" jack "HOLD" (Data Hold) button "COM" jack "SEL" (Select) button "V " jack Lead Alert LEDs Backlight button GlobalTestSupply www. -
Page 8: Function Buttons
ENGLISH FUNCTION BUTTONS ON/OFF To Power ON the meter rotate the Function Selector switch from the OFF setting to any measurement setting. To Power OFF the meter rotate the Function Selector switch to the OFF setting. By default, the meter will automatically Power OFF after 15 minutes of inactivity. - Page 9 OPERATING INSTRUCTIONS CONNECTING TEST LEADS Do not test if leads are improperly seated. Results could cause intermittent display readings. To ensure proper connection, firmly press leads into the input jack completely. INCORRECT CORRECT TESTING IN CAT III / CAT IV MEASUREMENT LOCATIONS Ensure the test lead shield is pressed firmly in place.
- Page 10 ENGLISH OPERATING INSTRUCTIONS AC/DC VOLTAGE (LESS THAN 600V) 1. Insert RED test lead into V jack , and BLACK test lead into COM jack , and rotate function selector switch to the V setting. NOTE: The meter defaults to AC measurement. Press the "SEL" button to toggle between AC and DC modes.
- Page 11 OPERATING INSTRUCTIONS • For mA AC/DC currents <400mA: Insert RED test lead into V jack , and BLACK test lead into COM jack , and rotate function selector switch to the mA AC/DC setting. Black lead Red lead • For µA DC currents <400µA: Insert RED test lead into V jack , and BLACK test lead into COM jack , and rotate...
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Page 12: Resistance Measurements
ENGLISH OPERATING INSTRUCTIONS RESISTANCE MEASUREMENTS 1. Insert RED test lead into V jack , and BLACK test lead into COM jack , and rotate function selector switch to the Continuity/Resistance setting. NOTE: The meter defaults to Continuity testing in this mode. To enter Resistance testing mode, press the "SEL"... -
Page 13: Diode Test
OPERATING INSTRUCTIONS CAPACITANCE 1. Insert RED test lead into V jack , and BLACK test lead into COM jack , and rotate function selector switch to the Capacitance/Diode setting. NOTE: The meter defaults to Capacitance testing in this mode. Ensure that the display reads "0 nF" with test leads open. If not, press the "SEL"... -
Page 14: Frequency / Duty-Cycle
ENGLISH OPERATING INSTRUCTIONS FREQUENCY / DUTY-CYCLE 1. Insert RED test lead into V jack and BLACK test lead into COM jack , and rotate function selector switch to the Frequency/Duty-Cycle setting. NOTE: The meter defaults to Frequency testing in this mode. To enter Duty-Cycle testing mode, press the "SEL"... -
Page 15: Maintenance
MAINTENANCE BATTERY REPLACEMENT When the indicator is displayed, the batteries must be replaced. 1. Remove screw from battery door. 2. Replace 2 × AAA batteries (note proper polarity). 3. Replace battery door and fasten securely with screw. To avoid risk of electric shock, disconnect leads from any voltage source before removing battery door. -
Page 16: Fcc & Ic Compliance
ENGLISH CLEANING Be sure meter is turned off and wipe with a clean, dry lint-free cloth. Do not use abrasive cleaners or solvents. STORAGE Remove the batteries when meter is not in use for a prolonged period of time. Do not expose to high temperatures or humidity.
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